BATC Wiki - User contributions [en-gb]

User:G7UXW

2019-01-19T21:35:41Z

G7UXW:

A complete set of boards for the Portsdown Project have arrived. 
All available from the BATC Shop.

[[File:portsdown-kit.jpg|400px]] 

Bill Of Materials for the above boards excluding the Filter Modulator board 

BOM >>>> [[:File:portsdown.ods]]

User:G7UXW

2019-01-19T21:35:16Z

G7UXW:

File:Portsdown.ods

2019-01-19T21:29:57Z

G7UXW: G7UXW uploaded a new version of File:Portsdown.ods

File uploaded with MsUpload

File:Portsdown.ods

2019-01-19T21:19:07Z

G7UXW: G7UXW uploaded a new version of File:Portsdown.ods

File uploaded with MsUpload

User:G7UXW

2019-01-19T21:15:31Z

G7UXW:

A complete set of boards for the Portsdown Project have arrived. 
All available from the BATC Shop.

[[File:portsdown-kit.jpg|400px]] 

Bill Of Materials Used By G7UXW
[[:File:portsdown.ods]]

File:Portsdown.ods

2019-01-19T21:14:26Z

G7UXW: File uploaded with MsUpload

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File:Portsdown.pdf

2019-01-19T21:01:03Z

G7UXW: G7UXW uploaded a new version of File:Portsdown.pdf

File uploaded with MsUpload

User:G7UXW

2019-01-19T20:56:35Z

G7UXW:

A complete set of boards for the Portsdown Project have arrived. 
All available from the BATC Shop.

[[File:portsdown-kit.jpg|400px]] 

[[:File:portsdown.pdf]]

File:Portsdown.pdf

2019-01-19T20:55:21Z

G7UXW: File uploaded with MsUpload

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User:G7UXW

2019-01-19T20:30:14Z

G7UXW:

A complete set of boards for the Portsdown Project have arrived. 
All available from the BATC Shop.

[[File:portsdown-kit.jpg|400px]]

User:G7UXW

2019-01-19T20:11:47Z

G7UXW: Created page with "A complete set of boards for the Portsdown Project have arrived All available from the BATC Shop 400px"

A complete set of boards for the Portsdown Project have arrived
All available from the BATC Shop

[[File:portsdown-kit.jpg|400px]]

File:Portsdown-kit.jpg

2019-01-19T20:03:07Z

G7UXW: G7UXW uploaded a new version of File:Portsdown-kit.jpg

File uploaded with MsUpload

File:Portsdown-kit.jpg

2019-01-19T19:58:57Z

G7UXW: File uploaded with MsUpload

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File:DECODE 4 Band Decode BOM 4bbom.doc

2019-01-16T16:49:14Z

G7UXW: Created page with ":File:4 band decoder BOM.doc"

[[:File:4 band decoder BOM.doc]]

File:4 band decoder BOM.doc

2019-01-16T16:49:04Z

G7UXW: G7UXW uploaded a new version of File:4 band decoder BOM.doc

File uploaded with MsUpload

PTT and band switching

2019-01-16T16:48:30Z

G7UXW: /* GPIO band decoder */

In order to make the Portsdown transmitter integrated with transmit and receive systems, Pin 40 of the GPIO goes high when transmit is selected and the signals on pins 28 and 35 can be used for band switching.

===Band outputs===

These outputs are used to switch the LO filter and can be used to switch external filter and amplifiers.
{| class="wikitable"
|-
!Frequency Mhz !! ATV Band !! Pin 28 !! Pin 35
|-
| < 100 MHz|| 71 MHz|| Lo|| Lo
|-
| 100 - 250 MHz || 146 MHz || Lo|| Hi
|-
| 250 - 950 MHz|| 437 MHz|| Hi || Lo
|-
| 950 - 4400 MHz|| 23cms || Hi|| Hi

|}

Care must be taken to properly buffer these 3.3v signals from relay transients.

===GPIO band decoder===

As we only have 2 GPIO pins to provide 4 outputs, these outputs need to be decoded to provide an output for each band.

[[File:Band decoder.JPG|400px]]

The Portsdown team have designed a simple board which can be either constructed on 0.1” perforated board (veroboard) or on a PCB - this can be home etched using the details below or blank PCBs are available in the BATC shop.

[[File:4 band decode.JPG|500px]]

[[:File:DECODE 4 Band instructions (2).pdf]]

[[:File:Decode 4 Band Schematic.pdf]]

[[:File:Decode 4 Band Perf Bd wiring.pdf]]

[[:File:DECODE 4 Band Mirrored w SS.pdf]]

[[:File:DECODE 4 Band Mirrored.pdf]]

[[:File:DECODE 4 Band PCB Layout w SS.pdf]]

[[:File:DECODE 4 Band Decode BOM 4bbom.doc]]

===PTT steering===

These band outputs can then used to "steer" the PTT line to the correct Power Amplifier using this simple relay and diode circuit - no PCB needed :-)

[[File:tx switching.JPG|400px]]

===Tx Rx sequencer===

We also recommend the use of a Tx / Rx sequencer to ensure your mast head relay has changed over and your expensive pre-amp is de-powered before you start transmitting. The sequence is as follows:

To go to Tx:

1) Turn off receiver pre-amp

2) Switch ant c/o relay to transmit

3) Apply power to PA

To go to rx

a) Turn off Tx

b) Switch ant c/o relay to receive

c) Apply power to pre-amp.

Many circuits and pre-built designs are available including this simple single chip design by Ian Waters G3KKD published in CQ-TV 125.

[[File:Tx rx timing.JPG|400px]]

David M0YDH shows Ian's design in operation:- [http://youtu.be/u4AeW-bPYxo G8ADE RELAY SEQUENCER VIDEO]
and [https://www.youtube.com/watch?v=pUudd2GR63w&feature=youtu.be an updated version with extra relay for Portsdown PTT band switching.].
If you prefer an elegant kit solution then you could try the [http://www.shortwaveradio.co.uk/tropic.htm. TROPIC sequencer from Shortwave radio.]This is listed at £11.50 but price is available on application. W6PQL and W1GHZ have sequencer designs.

===Summary of GPIO connections===

As the Portsdown project has expanded in scope, so has demand for the GPIO connections on the RPi. Here is the latest list as of January 2018:

{| class="wikitable"
|-
! Pin No !! BCM No !! Wiring Pi !! RPi Name !! Primary Use !! Secondary Use !! DTX-1 Use
|-
| 1 || - || - || 3.3v || - || - || EXT-DVLM
|-
| 2 || - || - || 5v || - || - || -
|-
| 3 || 2 || 8 || SDA 1 || || - || EXT-SD0
|-
| 4 || - || - || 5v || - || - || -
|-
| 5 || 3 || 9 || SCL 1 || || - || EXT-SD1
|-
| 6 || - || - || 0v || - || - || -
|-
| 7 || 4 || 7 || GPIO 7 || Keyed Streaming LED Indication || Transverter Select or incoming stream active || EXT-SD2
|-
| 8 || 14 || 15 || TxD || ADF5355 LE || Elcom LE || EXT-SD3
|-
| 9 || - || - || 0v || - || - || -
|-
| 10 || 15 || 16 || RxD || Attenuator LE || - || EXT-SD4
|-
| 11 || 17 || 0 || GPIO 0 || LCD Display || - || EXT-SD5
|-
| 12 || 18 || 1 || GPIO 1 || Keyed Streaming or Keyed TX Switch || || EXT-SD6
|-
| 13 || 27 || 2 || GPIO 2 || Shutdown LED || || EXT-SD7
|-
| 14 || - || - || 0v || - || - || -
|-
| 15 || 22 || 3 || GPIO 3 || Shutdown Button || || EXT_TSCLK
|-
| 16 || 23 || 4 || GPIO 4 || LCD Display || - || -
|-
| 17 || - || - || 3.3v || - || - || -
|-
| 18 || 24 || 5 || GPIO 5 || LCD Display || - || EXT-PSYM
|-
| 19 || 10 || 12 || MOSI || LCD Display || - || -
|-
| 20 || - || - || 0v || - || - || -
|-
| 21 || 9 || 13 || MISO || LCD Display || - || -
|-
| 22 || 25 || 6 || GPIO 6 || LCD Display || - || -
|-
| 23 || 11 || 14 || SCLK || LCD Display || - || -
|-
| 24 || 8 || 10 || CE 0 || LCD Display || - || -
|-
| 25 || - || - || 0v || - || - || -
|-
| 26 || 7 || 11 || CE1|| Touch Sensor || - || -
|-
| 27 || 0 || 30 || SDA 0 || ADF4351 LE || - || -
|-
| 28 || 1 || 31 || SCL 0 || Band LSB (D0) || - || -
|-
| 29 || 5 || 21 || GPIO 21 || ADF4351 CLK || Atten and ADF5355 CLK || -
|-
| 30 || - || - || 0v || - || - || -
|-
| 31 || 6 || 22 || GPIO 22 || ADF4351 DATA || Atten and ADF5355 DATA || -
|-
| 32 || 12 || 26 || GPIO 26 || I output || "Ugly" and RPITX RF output || -
|-
| 33 || 13 || 23 || GPIO 23 || Q output || - || -
|-
| 34 || - || - || 0v || - || - || -
|-
| 35 || 19 || 24 || GPIO 24 || Band MSB (D1) || - || -
|-
| 36 || 16 || 27 || GPIO 27 || IQ Filter LSB (D0) || - || -
|-
| 37 || 26 || 25 || GPIO 25 || IQ Filter NSB (D1) || - || -
|-
| 38 || 20 || 28 || GPIO 28 || IQ Filter MSB (D2) || - || -
|-
| 39 || - || - || 0v || - || - || -
|-
| 40 || 21 || 29 || GPIO 29 || TX LED and PTT Drive || - || -
|}

Each pin on the RPi3 GPIO can be referred to in 4 ways: its physical pin number, the Broadcom I/O number, the Wiring Pi number or the name. Where possible, the Portsdown software uses the Wiring Pi driver and hence Wring Pi numbers in the code. The Broadcom numbers are referred to on the Willow Electronics GPIO breakout board.

For reference, here is the original Portsdown GPIO allocation chart, drawn up in early 2017.

[[File:GPIO pinout.JPG|600px]]

File:DECODE 4 Band Decode BOM 4bbom.xlsx

2019-01-16T16:46:00Z

G7UXW: Created page with ":File:4 band decoder BOM.doc"

[[:File:4 band decoder BOM.doc]]

File:4 band decoder BOM.doc

2019-01-16T16:45:41Z

G7UXW: File uploaded with MsUpload

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File:DECODE 4 Band BOM 4bbom.doc

2019-01-16T16:44:37Z

G7UXW:

PTT and band switching

2019-01-16T16:14:48Z

G7UXW: /* GPIO band decoder */

In order to make the Portsdown transmitter integrated with transmit and receive systems, Pin 40 of the GPIO goes high when transmit is selected and the signals on pins 28 and 35 can be used for band switching.

===Band outputs===

These outputs are used to switch the LO filter and can be used to switch external filter and amplifiers.
{| class="wikitable"
|-
!Frequency Mhz !! ATV Band !! Pin 28 !! Pin 35
|-
| < 100 MHz|| 71 MHz|| Lo|| Lo
|-
| 100 - 250 MHz || 146 MHz || Lo|| Hi
|-
| 250 - 950 MHz|| 437 MHz|| Hi || Lo
|-
| 950 - 4400 MHz|| 23cms || Hi|| Hi

|}

Care must be taken to properly buffer these 3.3v signals from relay transients.

===GPIO band decoder===

As we only have 2 GPIO pins to provide 4 outputs, these outputs need to be decoded to provide an output for each band.

[[File:Band decoder.JPG|400px]]

The Portsdown team have designed a simple board which can be either constructed on 0.1” perforated board (veroboard) or on a PCB - this can be home etched using the details below or blank PCBs are available in the BATC shop.

[[File:4 band decode.JPG|500px]]

[[:File:DECODE 4 Band instructions (2).pdf]]

[[:File:Decode 4 Band Schematic.pdf]]

[[:File:Decode 4 Band Perf Bd wiring.pdf]]

[[:File:DECODE 4 Band Mirrored w SS.pdf]]

[[:File:DECODE 4 Band Mirrored.pdf]]

[[:File:DECODE 4 Band PCB Layout w SS.pdf]]

[[:File:DECODE 4 Band Decode BOM 4bbom.xlsx]]

===PTT steering===

These band outputs can then used to "steer" the PTT line to the correct Power Amplifier using this simple relay and diode circuit - no PCB needed :-)

[[File:tx switching.JPG|400px]]

===Tx Rx sequencer===

We also recommend the use of a Tx / Rx sequencer to ensure your mast head relay has changed over and your expensive pre-amp is de-powered before you start transmitting. The sequence is as follows:

To go to Tx:

1) Turn off receiver pre-amp

2) Switch ant c/o relay to transmit

3) Apply power to PA

To go to rx

a) Turn off Tx

b) Switch ant c/o relay to receive

c) Apply power to pre-amp.

Many circuits and pre-built designs are available including this simple single chip design by Ian Waters G3KKD published in CQ-TV 125.

[[File:Tx rx timing.JPG|400px]]

David M0YDH shows Ian's design in operation:- [http://youtu.be/u4AeW-bPYxo G8ADE RELAY SEQUENCER VIDEO]
and [https://www.youtube.com/watch?v=pUudd2GR63w&feature=youtu.be an updated version with extra relay for Portsdown PTT band switching.].
If you prefer an elegant kit solution then you could try the [http://www.shortwaveradio.co.uk/tropic.htm. TROPIC sequencer from Shortwave radio.]This is listed at £11.50 but price is available on application. W6PQL and W1GHZ have sequencer designs.

===Summary of GPIO connections===

As the Portsdown project has expanded in scope, so has demand for the GPIO connections on the RPi. Here is the latest list as of January 2018:

{| class="wikitable"
|-
! Pin No !! BCM No !! Wiring Pi !! RPi Name !! Primary Use !! Secondary Use !! DTX-1 Use
|-
| 1 || - || - || 3.3v || - || - || EXT-DVLM
|-
| 2 || - || - || 5v || - || - || -
|-
| 3 || 2 || 8 || SDA 1 || || - || EXT-SD0
|-
| 4 || - || - || 5v || - || - || -
|-
| 5 || 3 || 9 || SCL 1 || || - || EXT-SD1
|-
| 6 || - || - || 0v || - || - || -
|-
| 7 || 4 || 7 || GPIO 7 || Keyed Streaming LED Indication || Transverter Select or incoming stream active || EXT-SD2
|-
| 8 || 14 || 15 || TxD || ADF5355 LE || Elcom LE || EXT-SD3
|-
| 9 || - || - || 0v || - || - || -
|-
| 10 || 15 || 16 || RxD || Attenuator LE || - || EXT-SD4
|-
| 11 || 17 || 0 || GPIO 0 || LCD Display || - || EXT-SD5
|-
| 12 || 18 || 1 || GPIO 1 || Keyed Streaming or Keyed TX Switch || || EXT-SD6
|-
| 13 || 27 || 2 || GPIO 2 || Shutdown LED || || EXT-SD7
|-
| 14 || - || - || 0v || - || - || -
|-
| 15 || 22 || 3 || GPIO 3 || Shutdown Button || || EXT_TSCLK
|-
| 16 || 23 || 4 || GPIO 4 || LCD Display || - || -
|-
| 17 || - || - || 3.3v || - || - || -
|-
| 18 || 24 || 5 || GPIO 5 || LCD Display || - || EXT-PSYM
|-
| 19 || 10 || 12 || MOSI || LCD Display || - || -
|-
| 20 || - || - || 0v || - || - || -
|-
| 21 || 9 || 13 || MISO || LCD Display || - || -
|-
| 22 || 25 || 6 || GPIO 6 || LCD Display || - || -
|-
| 23 || 11 || 14 || SCLK || LCD Display || - || -
|-
| 24 || 8 || 10 || CE 0 || LCD Display || - || -
|-
| 25 || - || - || 0v || - || - || -
|-
| 26 || 7 || 11 || CE1|| Touch Sensor || - || -
|-
| 27 || 0 || 30 || SDA 0 || ADF4351 LE || - || -
|-
| 28 || 1 || 31 || SCL 0 || Band LSB (D0) || - || -
|-
| 29 || 5 || 21 || GPIO 21 || ADF4351 CLK || Atten and ADF5355 CLK || -
|-
| 30 || - || - || 0v || - || - || -
|-
| 31 || 6 || 22 || GPIO 22 || ADF4351 DATA || Atten and ADF5355 DATA || -
|-
| 32 || 12 || 26 || GPIO 26 || I output || "Ugly" and RPITX RF output || -
|-
| 33 || 13 || 23 || GPIO 23 || Q output || - || -
|-
| 34 || - || - || 0v || - || - || -
|-
| 35 || 19 || 24 || GPIO 24 || Band MSB (D1) || - || -
|-
| 36 || 16 || 27 || GPIO 27 || IQ Filter LSB (D0) || - || -
|-
| 37 || 26 || 25 || GPIO 25 || IQ Filter NSB (D1) || - || -
|-
| 38 || 20 || 28 || GPIO 28 || IQ Filter MSB (D2) || - || -
|-
| 39 || - || - || 0v || - || - || -
|-
| 40 || 21 || 29 || GPIO 29 || TX LED and PTT Drive || - || -
|}

Each pin on the RPi3 GPIO can be referred to in 4 ways: its physical pin number, the Broadcom I/O number, the Wiring Pi number or the name. Where possible, the Portsdown software uses the Wiring Pi driver and hence Wring Pi numbers in the code. The Broadcom numbers are referred to on the Willow Electronics GPIO breakout board.

For reference, here is the original Portsdown GPIO allocation chart, drawn up in early 2017.

[[File:GPIO pinout.JPG|600px]]

Assembling Portsdown

2019-01-07T14:54:40Z

G7UXW: Corrected URL from .tv to .org.uk

This section will describe in detail how to assemble your Portsdown transmitter - to begin, you need to have bought or built all the components listed in the [[Portsdown hardware|hardware description.]]

This page describes how to build the complete transmitter assembly but you can run the Portsdown as an experiment in [[QPSKRF or Ugly mode|"Ugly Mode"]], currently labelled in the Menu as QPSKRF. That does not require you to wire anything together.

===Mechanical Design===

First of all, decide on your mechanical design. You are going to need to have the RPi firmly mounted, with the Micro-SD card slot accessible (to change the card if required) and the power, network and USB connectors available. Then you will need to stack a GPIO extender on top of the RPi.

The most difficult part will be to mount the Touchscreen display. It can either be stacked on top of the RPi, or you can connect it by a short multiway lead and mount it on the front panel of your housing - an example is here: http://www.ebay.co.uk/itm/141354697688

f you have a 3D printer you could try make up one of these housing http://www.thingiverse.com/thing:1920486

You will then need to consider mounting the ADF4351 Synthesizer, any LO filters and then the Filter/modulator board. Other things to think about might be a 5V power supply, a relay/PTT switching board and any dongles (EasyCap, Sound or RTL-SDR).

The block diagram of what you are trying to achieve is below. Note that you will need an additional filter between the synthesizer and the filter/modulator board for 437 MHz and 146 MHz. It is not required for 1255 MHz, and the unit will work on the other bands for testing without it.

[[File:1-1 Block Diagram.jpg|600px]]

An example layout is here

[[File:In the box.jpg|600px]]

===Interconnecting the modules===

The following diagram shows the interconnects between the various modules - all wire can be non screened (except the Local oscillator feed to the Filter modulator board) but should be kept as short as possible.

[[File:Portsdown interconnects.JPG|600px]]

Higher resolution pdf is available here [[:File:Portsdwon interconnect v2.pdf]]

Or a picture might help...

[[File:assembly.JPG|600px]]

===BATC GPIO breakout card===

The GPIO breakout card is where all the signals and power for Portsdown interconnect and we recommend that you buy the blank PCB from the BATC and make up the breakcard using either connectors or hard wiring to the other boards.
For more details see this [[GPIO breakout|wiki page]]

[[File:screw t.jpg|300px]]

[[Willow components breakout card]] (If you have bought the BATC GPIO breakout card you DO NOT NEED to read this section)

===Powering the ADF4351===

The ADF4351 module needs between 5 and 9 volts on its power connector. You can either buy a suitable (small barrel) connector or solder the wires to the underside of the board. The 5V supply can be taken from the same source as the Raspberry Pi 5.2V supply, or from any other 5V supply. It does not need to be very clean. DO NOT try to put 3.3V into the marked pin on the data connector on the module; this is a low current output, not an input.

===RF Wiring===

Use short flexible SMA cables to connect the ADF4351 (through filters if necessary) to the filter/modulator board. Use another cable to take the output to a panel connector or subsequent filters and power amplifiers.

You may also want to extend the input of any RTL-SDR to be accessible from a panel connector.

===Power Supplies and Wiring===

You should power the RPi through the Micro-USB power connector to take advantage of the input protection provided. Use a very short USB cable to your power supply as most of these cables are of very poor quality and cause significant voltage drop. For best results, cut the USB cable 5cm from the connector and run "real" wiring from there to your power supply.

Do not power unnecessary items from the RPi's 5v outputs on the GPIO connector. Doing so will induce extra voltage drop in the input protection circuitry. Power the VCO filter and RF Switch directly from the switch mode power supply. No problems with ripple have been observed.

A lot of strange problems, such as the Portsdown running very slowly or intermittent/noisy streaming, can be caused by poor PSU volts - the RPi3 is actually specced for 5.1 volts, make sure your PSU delivers enough volts and current. See [https://forum.batc.org.uk/viewtopic.php?t=4856&p=11935#p11935 this post on the BATC forum] for a real user experience!

If you see a "Lightning Flash" symbol at the top right of your LCD display it means that the voltage at the RPi is too low. You can measure the voltage between the GPIO connector pins 4 and 6.

[[File:flash.jpg|400px]]

You can check if there are any problems by running the command
vcgencmd get_throttled
from the command line. You should get the response "throttled=0x0" which means that all is well. The response "throttled=0x50000" means that the voltage has dropped below the safe level at least once since boot-up; the response "throttled=0x50005" means that the voltage is currently below the safe level. Other responses might mean that your RPi is overheating. The "Info" screen on Menu 3 will also state if there have been any low-voltage events since boot-up.

An eBay buck regulator capable of supplying at least 4A continuous at 5.2V is recommended to power the RPi, an EasyCap, an RTL-SDR and the ADF4351. '''Consumer-grade RPi power supplies with consumer grade USB cables have rarely proved to be capable of supplying this high demand without causing dropouts.'''

The filter/modulator board needs a clean 5V at 250 mA and the on-board linear regulator supplies this, but can get warm at higher input voltages. The linear regulator needs at least 7V to operate properly. Feeding it with 8 volts provides the best compromise between regulator margin and heat dissipation.

You can use a switching or buck converter to supply the filter-modulator board with 5V, but the switching ripple introduces some detectable sidebands on the transmitted signal. These have very little adverse effect, but are visible on a spectrum analyser. On-board switching regulators have been tested, and the pads are there for L10 to provide extra filtering. Again, they introduce low-level sidebands, but these are probably not significant.

===Network and USB Wiring===

Consider bringing the network connector and one of the USB connectors out to the panel for easy access and mechanical stability.

===Camera Wiring===

The RPi camera gives excellent results, but only comes with a short ribbon cable to connect it to the RPi.

It is possible to use some higher quality HDMI leads (the ground connections all need to be made) to extend the camera lead - this does NOT mean the signal out of the camera is HDMI, it is actually "Camera Serial Interface Type 2 (CSI-2)". We are just using HDMI cable as a useful extension lead. The modification described here https://wiki.batc.org.uk/CSI-2_to_HDMI allows the use of lower quality HDMI cables.

Kits are available to connect a female HDMI connector to the RPi camera connector, and another female to the camera, allowing the use of domestic 1, 2 and 3m HDMI leads. The Pi camera HDMI Lead Extension Kit is available from here https://www.tindie.com/products/freto/pi-camera-hdmi-cable-extension/

===USB Cables===

Use short (shortened?) good quality USB cables to connect the EasyCap and RTL-SDR to the RPi. Use of the poor-quality USB cable supplied with the EasyCap has been shown to cause audio dropouts in a streamed signal.

DATV Equipment Shopping List

2019-01-05T15:45:34Z

G7UXW: /* 2. MiniTiouner. Receive only */

This page describes a number of equipment lists that enable a progressive introduction to DATV without necessarily buying everything at once. The Portsdown hardware is described in more detail here: https://wiki.batc.org.uk/Portsdown_hardware .

===1. Domestic Satellite Receiver. Receive only===

A domestic satellite receiver (not a Sky box) may receive amateur DATV transmissions in the 23 cm band. You should check that the receiver will accept symbol rates down to 1MS, and you will need to connect a suitable preamp and aerial. Be careful as there will by 13-18V on the satellite tuner's aerial connector. Note that domestic satellite tuners cannot receive RB-TV transmissions with the lower symbol rates of 500KS, 333KS or 125KS.

===2. MiniTiouner. Receive only===

The MiniTiouner [[https://wiki.batc.org.uk/MiniTioune]] is the recommended equipment to receive amateur DATV transmissions. The MiniTiouner connects to a PC, and with suitable aerials and preamps, can receive amateur DATV transmissions at symbol rates from 125KS up to 8MS on the 146, 437, 1255 and 2400 MHz bands. It is only available in partial kit form. The BATC shop https://batc.org.uk/shop/minitiouner sells the following parts:

Serit FTS4334L tuner

MiniTiouner version 2 blank PCB

FT2232H USB module

1 volt regulator

The other parts required can be obtained from RS or Farnell and are listed here [[https://wiki.batc.org.uk/File:Seritpartsv3.xls]].

===3. Portsdown Raspberry Pi Transmit Cross-shack to MiniTiouner ONLY===

A Raspberry Pi version 3 computer can be programmed to transmit RB-TV pictures across the shack to a MiniTiouner without any additional hardware. This is known as "Ugly" (or QPSKRF) mode and the spectrum is not clean enough to be amplified or transmitted from an external aerial. Note that the maximum symbol rate is 333KS so this signal cannot be decoded by a domestic satellite receiver; only a MiniTiouner is suitable. This set-up requires:

Raspberry Pi 3 Computer and power supply

SD Card (available from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-pre-programmed-sd-card/)

MiniTiouner and PC as described in 2 above

===4. Portsdown Transmit Cross-shack and local to MiniTiouner or Domestic Sat RX===

To transmit DATV signals that can be received on a domestic satellite receiver and are fit for external transmission, a local oscillator and filter-modulator board need to be added. The local oscillator needs to generate about -2 dBm on the desired transmission frequency (between 70 and 2410 MHz); the recommended local oscillator is a synthesizer based on the ADF4351 IC and is available from eBay. The filter-modulator can be bought ready-built from the BATC shop, or the just the PCB can be purchased and the components purchased from DigiKey for home assembly. A GPIO break-out card and header connector makes wiring up the modules a lot easier. This set-up will generate over 2 mW of DATV on the chosen frequency:

Raspberry Pi 3 Computer and power supply

SD Card (available from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-pre-programmed-sd-card/)

ADF4351 Local Oscillator (from eBay)

Filter modulator V2 ready built PCB (from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-assembled-filter-modulator-board/)

GPIO breakout board (from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-gpio-breakout-board-blank-pcb)

Header Connector (from ModMyPi: https://www.modmypi.com/raspberry-pi/gpio-and-breadboarding/40-pin-gpio-connectors/40-pin-extra-tall-header-solder-version)

Domestic Sat RX or MiniTiouner and PC as described in 1 or 2 above

===5. Multiband Touchscreen-controlled Portsdown Transmitter===

The complete Portsdown transmitter is designed to work on up to 4 bands and be controlled by a Waveshare 3.5 inch touchscreen. Multiband operation requires that the VCO's 3rd harmonic is filtered out on the lower bands. Also, output switching and band select switching can be provided. A Raspberry Pi Camera provides a local picture source, and a Pi Camera Extension Lead kit makes it easier to use; a USB sound dongle provides a microphone input. An EasyCap allows the use of an external composite video input source. External filters and PAs are of course required and are described elsewhere on this Wiki. Here is a complete list of the major components:

Raspberry Pi 3 Computer and power supply

SD Card (available from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-pre-programmed-sd-card/)

Waveshare 3.5 inch Model A LCD touchscreen (available from Amazon https://www.amazon.co.uk/Waveshare-Raspberry-Resistive-Interface-Rapsberry-pi/dp/B00OZLG2YS )

GPIO breakout board (PCB from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-gpio-breakout-board-blank-pcb/, components from DigiKey)

Header Connector (from ModMyPi: https://www.modmypi.com/raspberry-pi/gpio-and-breadboarding/40-pin-gpio-connectors/40-pin-extra-tall-header-solder-version)

Raspberry Pi Camera

Raspberry Pi Camera extension lead kit (avalable from Tindie: https://www.tindie.com/products/freto/pi-camera-hdmi-cable-extension/ )

USB sound dongle (available from eBay)

EasyCap composite video capture dongle (available from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-easycap-video-capture-device/)

ADF4351 Local Oscillator (from eBay)

Local oscillator filter (PCB from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-filter-modulator-board-blank-pcb-2, components from DigiKey)

Filter modulator V2 ready built PCB (from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-assembled-filter-modulator-board)

RF output switch (PCB from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-rf-output-switch-blank-pcb, components from DigiKey)

4 band decode for Transmit switching (PCB from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-4-band-decode-blank-pcb, components from DigiKey)

Optional PE43703 or PE4302 Output Attenuator (from eBay)

Domestic Sat RX or MiniTiouner and PC as described in 1 or 2 above

===6. Repeater Streaming from a Portsdown===

The Portsdown software is capable of providing a stand-alone unattended streamer for repeaters. Although initial configuration requires a laptop or PC, once set up no such control is required. The minimum equipment required for streaming is:

Raspberry Pi 3 Computer and power supply

SD Card (available from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-pre-programmed-sd-card)

EasyCap composite video capture dongle (available from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-easycap-video-capture-device)

G8GKQ 14 August 2017

DATV Equipment Shopping List

2019-01-05T15:20:17Z

G7UXW: /* 2. MiniTiouner. Receive only */

This page describes a number of equipment lists that enable a progressive introduction to DATV without necessarily buying everything at once. The Portsdown hardware is described in more detail here: https://wiki.batc.org.uk/Portsdown_hardware .

===1. Domestic Satellite Receiver. Receive only===

A domestic satellite receiver (not a Sky box) may receive amateur DATV transmissions in the 23 cm band. You should check that the receiver will accept symbol rates down to 1MS, and you will need to connect a suitable preamp and aerial. Be careful as there will by 13-18V on the satellite tuner's aerial connector. Note that domestic satellite tuners cannot receive RB-TV transmissions with the lower symbol rates of 500KS, 333KS or 125KS.

===2. MiniTiouner. Receive only===

The MiniTiouner [[https://wiki.batc.tv/MiniTioune]] is the recommended equipment to receive amateur DATV transmissions. The MiniTiouner connects to a PC, and with suitable aerials and preamps, can receive amateur DATV transmissions at symbol rates from 125KS up to 8MS on the 146, 437, 1255 and 2400 MHz bands. It is only available in partial kit form. The BATC shop https://batc.org.uk/shop/minitiouner sells the following parts:

Serit FTS4334L tuner

MiniTiouner version 2 blank PCB

FT2232H USB module

1 volt regulator

The other parts required can be obtained from RS or Farnell and are listed here [[https://wiki.batc.org.uk/File:Seritpartsv3.xls]].

===3. Portsdown Raspberry Pi Transmit Cross-shack to MiniTiouner ONLY===

A Raspberry Pi version 3 computer can be programmed to transmit RB-TV pictures across the shack to a MiniTiouner without any additional hardware. This is known as "Ugly" (or QPSKRF) mode and the spectrum is not clean enough to be amplified or transmitted from an external aerial. Note that the maximum symbol rate is 333KS so this signal cannot be decoded by a domestic satellite receiver; only a MiniTiouner is suitable. This set-up requires:

Raspberry Pi 3 Computer and power supply

SD Card (available from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-pre-programmed-sd-card/)

MiniTiouner and PC as described in 2 above

===4. Portsdown Transmit Cross-shack and local to MiniTiouner or Domestic Sat RX===

To transmit DATV signals that can be received on a domestic satellite receiver and are fit for external transmission, a local oscillator and filter-modulator board need to be added. The local oscillator needs to generate about -2 dBm on the desired transmission frequency (between 70 and 2410 MHz); the recommended local oscillator is a synthesizer based on the ADF4351 IC and is available from eBay. The filter-modulator can be bought ready-built from the BATC shop, or the just the PCB can be purchased and the components purchased from DigiKey for home assembly. A GPIO break-out card and header connector makes wiring up the modules a lot easier. This set-up will generate over 2 mW of DATV on the chosen frequency:

Raspberry Pi 3 Computer and power supply

SD Card (available from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-pre-programmed-sd-card/)

ADF4351 Local Oscillator (from eBay)

Filter modulator V2 ready built PCB (from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-assembled-filter-modulator-board/)

GPIO breakout board (from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-gpio-breakout-board-blank-pcb)

Header Connector (from ModMyPi: https://www.modmypi.com/raspberry-pi/gpio-and-breadboarding/40-pin-gpio-connectors/40-pin-extra-tall-header-solder-version)

Domestic Sat RX or MiniTiouner and PC as described in 1 or 2 above

===5. Multiband Touchscreen-controlled Portsdown Transmitter===

The complete Portsdown transmitter is designed to work on up to 4 bands and be controlled by a Waveshare 3.5 inch touchscreen. Multiband operation requires that the VCO's 3rd harmonic is filtered out on the lower bands. Also, output switching and band select switching can be provided. A Raspberry Pi Camera provides a local picture source, and a Pi Camera Extension Lead kit makes it easier to use; a USB sound dongle provides a microphone input. An EasyCap allows the use of an external composite video input source. External filters and PAs are of course required and are described elsewhere on this Wiki. Here is a complete list of the major components:

Raspberry Pi 3 Computer and power supply

SD Card (available from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-pre-programmed-sd-card/)

Waveshare 3.5 inch Model A LCD touchscreen (available from Amazon https://www.amazon.co.uk/Waveshare-Raspberry-Resistive-Interface-Rapsberry-pi/dp/B00OZLG2YS )

GPIO breakout board (PCB from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-gpio-breakout-board-blank-pcb/, components from DigiKey)

Header Connector (from ModMyPi: https://www.modmypi.com/raspberry-pi/gpio-and-breadboarding/40-pin-gpio-connectors/40-pin-extra-tall-header-solder-version)

Raspberry Pi Camera

Raspberry Pi Camera extension lead kit (avalable from Tindie: https://www.tindie.com/products/freto/pi-camera-hdmi-cable-extension/ )

USB sound dongle (available from eBay)

EasyCap composite video capture dongle (available from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-easycap-video-capture-device/)

ADF4351 Local Oscillator (from eBay)

Local oscillator filter (PCB from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-filter-modulator-board-blank-pcb-2, components from DigiKey)

Filter modulator V2 ready built PCB (from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-assembled-filter-modulator-board)

RF output switch (PCB from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-rf-output-switch-blank-pcb, components from DigiKey)

4 band decode for Transmit switching (PCB from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-4-band-decode-blank-pcb, components from DigiKey)

Optional PE43703 or PE4302 Output Attenuator (from eBay)

Domestic Sat RX or MiniTiouner and PC as described in 1 or 2 above

===6. Repeater Streaming from a Portsdown===

The Portsdown software is capable of providing a stand-alone unattended streamer for repeaters. Although initial configuration requires a laptop or PC, once set up no such control is required. The minimum equipment required for streaming is:

Raspberry Pi 3 Computer and power supply

SD Card (available from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-pre-programmed-sd-card)

EasyCap composite video capture dongle (available from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-easycap-video-capture-device)

G8GKQ 14 August 2017

DATV Equipment Shopping List

2018-12-30T16:59:58Z

G7UXW: Link redirected to correct page (URL)

This page describes a number of equipment lists that enable a progressive introduction to DATV without necessarily buying everything at once. The Portsdown hardware is described in more detail here: https://wiki.batc.org.uk/Portsdown_hardware .

===1. Domestic Satellite Receiver. Receive only===

A domestic satellite receiver (not a Sky box) may receive amateur DATV transmissions in the 23 cm band. You should check that the receiver will accept symbol rates down to 1MS, and you will need to connect a suitable preamp and aerial. Be careful as there will by 13-18V on the satellite tuner's aerial connector. Note that domestic satellite tuners cannot receive RB-TV transmissions with the lower symbol rates of 500KS, 333KS or 125KS.

===2. MiniTiouner. Receive only===

The MiniTiouner [[https://wiki.batc.tv/MiniTioune]] is the recommended equipment to receive amateur DATV transmissions. The MiniTiouner connects to a PC, and with suitable aerials and preamps, can receive amateur DATV transmissions at symbol rates from 125KS up to 8MS on the 146, 437, 1255 and 2400 MHz bands. It is only available in partial kit form. The BATC shop https://batc.org.uk/shop/minitiouner sells the following parts:

Serit FTS4334L tuner

MiniTiouner version 2 blank PCB

FT2232H USB module

1 volt regulator

The other parts required can be obtained from RS or Farnell and are listed here [[https://wiki.batc.tv/File:Seritpartsv3.xls]].

===3. Portsdown Raspberry Pi Transmit Cross-shack to MiniTiouner ONLY===

A Raspberry Pi version 3 computer can be programmed to transmit RB-TV pictures across the shack to a MiniTiouner without any additional hardware. This is known as "Ugly" (or QPSKRF) mode and the spectrum is not clean enough to be amplified or transmitted from an external aerial. Note that the maximum symbol rate is 333KS so this signal cannot be decoded by a domestic satellite receiver; only a MiniTiouner is suitable. This set-up requires:

Raspberry Pi 3 Computer and power supply

SD Card (available from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-pre-programmed-sd-card/)

MiniTiouner and PC as described in 2 above

===4. Portsdown Transmit Cross-shack and local to MiniTiouner or Domestic Sat RX===

To transmit DATV signals that can be received on a domestic satellite receiver and are fit for external transmission, a local oscillator and filter-modulator board need to be added. The local oscillator needs to generate about -2 dBm on the desired transmission frequency (between 70 and 2410 MHz); the recommended local oscillator is a synthesizer based on the ADF4351 IC and is available from eBay. The filter-modulator can be bought ready-built from the BATC shop, or the just the PCB can be purchased and the components purchased from DigiKey for home assembly. A GPIO break-out card and header connector makes wiring up the modules a lot easier. This set-up will generate over 2 mW of DATV on the chosen frequency:

Raspberry Pi 3 Computer and power supply

SD Card (available from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-pre-programmed-sd-card/)

ADF4351 Local Oscillator (from eBay)

Filter modulator V2 ready built PCB (from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-assembled-filter-modulator-board/)

GPIO breakout board (from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-gpio-breakout-board-blank-pcb)

Header Connector (from ModMyPi: https://www.modmypi.com/raspberry-pi/gpio-and-breadboarding/40-pin-gpio-connectors/40-pin-extra-tall-header-solder-version)

Domestic Sat RX or MiniTiouner and PC as described in 1 or 2 above

===5. Multiband Touchscreen-controlled Portsdown Transmitter===

The complete Portsdown transmitter is designed to work on up to 4 bands and be controlled by a Waveshare 3.5 inch touchscreen. Multiband operation requires that the VCO's 3rd harmonic is filtered out on the lower bands. Also, output switching and band select switching can be provided. A Raspberry Pi Camera provides a local picture source, and a Pi Camera Extension Lead kit makes it easier to use; a USB sound dongle provides a microphone input. An EasyCap allows the use of an external composite video input source. External filters and PAs are of course required and are described elsewhere on this Wiki. Here is a complete list of the major components:

Raspberry Pi 3 Computer and power supply

SD Card (available from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-pre-programmed-sd-card/)

Waveshare 3.5 inch Model A LCD touchscreen (available from Amazon https://www.amazon.co.uk/Waveshare-Raspberry-Resistive-Interface-Rapsberry-pi/dp/B00OZLG2YS )

GPIO breakout board (PCB from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-gpio-breakout-board-blank-pcb/, components from DigiKey)

Header Connector (from ModMyPi: https://www.modmypi.com/raspberry-pi/gpio-and-breadboarding/40-pin-gpio-connectors/40-pin-extra-tall-header-solder-version)

Raspberry Pi Camera

Raspberry Pi Camera extension lead kit (avalable from Tindie: https://www.tindie.com/products/freto/pi-camera-hdmi-cable-extension/ )

USB sound dongle (available from eBay)

EasyCap composite video capture dongle (available from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-easycap-video-capture-device/)

ADF4351 Local Oscillator (from eBay)

Local oscillator filter (PCB from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-filter-modulator-board-blank-pcb-2, components from DigiKey)

Filter modulator V2 ready built PCB (from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-assembled-filter-modulator-board)

RF output switch (PCB from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-rf-output-switch-blank-pcb, components from DigiKey)

4 band decode for Transmit switching (PCB from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-4-band-decode-blank-pcb, components from DigiKey)

Optional PE43703 or PE4302 Output Attenuator (from eBay)

Domestic Sat RX or MiniTiouner and PC as described in 1 or 2 above

===6. Repeater Streaming from a Portsdown===

The Portsdown software is capable of providing a stand-alone unattended streamer for repeaters. Although initial configuration requires a laptop or PC, once set up no such control is required. The minimum equipment required for streaming is:

Raspberry Pi 3 Computer and power supply

SD Card (available from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-pre-programmed-sd-card)

EasyCap composite video capture dongle (available from BATC Shop https://batc.org.uk/shop/portsdown-transmitter-easycap-video-capture-device)

G8GKQ 14 August 2017

DATV Equipment Shopping List

2018-12-06T15:20:03Z

G7UXW:

This page describes a number of equipment lists that enable a progressive introduction to DATV without necessarily buying everything at once. The Portsdown hardware is described in more detail here: https://wiki.batc.org.uk/Portsdown_hardware .

===1. Domestic Satellite Receiver. Receive only===

A domestic satellite receiver (not a Sky box) may receive amateur DATV transmissions in the 23 cm band. You should check that the receiver will accept symbol rates down to 1MS, and you will need to connect a suitable preamp and aerial. Be careful as there will by 13-18V on the satellite tuner's aerial connector. Note that domestic satellite tuners cannot receive RB-TV transmissions with the lower symbol rates of 500KS, 333KS or 125KS.

===2. MiniTiouner. Receive only===

The MiniTiouner [[https://wiki.batc.tv/MiniTioune]] is the recommended equipment to receive amateur DATV transmissions. The MiniTiouner connects to a PC, and with suitable aerials and preamps, can receive amateur DATV transmissions at symbol rates from 125KS up to 8MS on the 146, 437, 1255 and 2400 MHz bands. It is only available in partial kit form. The BATC shop https://batc.org.uk/shop/minitiouner sells the following parts:

Serit FTS4334L tuner

MiniTiouner version 2 blank PCB

FT2232H USB module

1 volt regulator

The other parts required can be obtained from RS or Farnell and are listed here [[https://wiki.batc.tv/File:Seritpartsv3.xls]].

===3. Portsdown Raspberry Pi Transmit Cross-shack to MiniTiouner ONLY===

A Raspberry Pi version 3 computer can be programmed to transmit RB-TV pictures across the shack to a MiniTiouner without any additional hardware. This is known as "Ugly" (or QPSKRF) mode and the spectrum is not clean enough to be amplified or transmitted from an external aerial. Note that the maximum symbol rate is 333KS so this signal cannot be decoded by a domestic satellite receiver; only a MiniTiouner is suitable. This set-up requires:

Raspberry Pi 3 Computer and power supply

SD Card (available from BATC Shop https://batc.org.uk/shop/portsdowntc)

MiniTiouner and PC as described in 2 above

===4. Portsdown Transmit Cross-shack and local to MiniTiouner or Domestic Sat RX===

To transmit DATV signals that can be received on a domestic satellite receiver and are fit for external transmission, a local oscillator and filter-modulator board need to be added. The local oscillator needs to generate about -2 dBm on the desired transmission frequency (between 70 and 2410 MHz); the recommended local oscillator is a synthesizer based on the ADF4351 IC and is available from eBay. The filter-modulator can be bought ready-built from the BATC shop, or the just the PCB can be purchased and the components purchased from DigiKey for home assembly. A GPIO break-out card and header connector makes wiring up the modules a lot easier. This set-up will generate over 2 mW of DATV on the chosen frequency:

Raspberry Pi 3 Computer and power supply

SD Card (available from BATC Shop https://batc.org.uk/shop/portsdowntc)

ADF4351 Local Oscillator (from eBay)

Filter modulator V2 ready built PCB (from BATC Shop https://batc.org.uk/shop/portsdowntc)

GPIO breakout board (from BATC Shop https://batc.org.uk/shop/portsdowntc)

Header Connector (from ModMyPi: https://www.modmypi.com/raspberry-pi/gpio-and-breadboarding/40-pin-gpio-connectors/40-pin-extra-tall-header-solder-version)

Domestic Sat RX or MiniTiouner and PC as described in 1 or 2 above

===5. Multiband Touchscreen-controlled Portsdown Transmitter===

The complete Portsdown transmitter is designed to work on up to 4 bands and be controlled by a Waveshare 3.5 inch touchscreen. Multiband operation requires that the VCO's 3rd harmonic is filtered out on the lower bands. Also, output switching and band select switching can be provided. A Raspberry Pi Camera provides a local picture source, and a Pi Camera Extension Lead kit makes it easier to use; a USB sound dongle provides a microphone input. An EasyCap allows the use of an external composite video input source. External filters and PAs are of course required and are described elsewhere on this Wiki. Here is a complete list of the major components:

Raspberry Pi 3 Computer and power supply

SD Card (available from BATC Shop https://batc.org.uk/shop/portsdowntc)

Waveshare 3.5 inch Model A LCD touchscreen (available from Amazon https://www.amazon.co.uk/Waveshare-Raspberry-Resistive-Interface-Rapsberry-pi/dp/B00OZLG2YS )

GPIO breakout board (PCB from BATC Shop https://batc.org.uk/shop/portsdowntc, components from DigiKey)

Header Connector (from ModMyPi: https://www.modmypi.com/raspberry-pi/gpio-and-breadboarding/40-pin-gpio-connectors/40-pin-extra-tall-header-solder-version)

Raspberry Pi Camera

Raspberry Pi Camera extension lead kit (avalable from Tindie: https://www.tindie.com/products/freto/pi-camera-hdmi-cable-extension/ )

USB sound dongle (available from eBay)

EasyCap composite video capture dongle (available from BATC Shop https://batc.org.uk/shop/portsdowntc)

ADF4351 Local Oscillator (from eBay)

Local oscillator filter (PCB from BATC Shop https://batc.org.uk/shop/portsdowntc, components from DigiKey)

Filter modulator V2 ready built PCB (from BATC Shop https://batc.org.uk/shop/portsdowntc)

RF output switch (PCB from BATC Shop https://batc.org.uk/shop/portsdowntc, components from DigiKey)

4 band decode for Transmit switching (PCB from BATC Shop https://batc.org.uk/shop/portsdowntc, components from DigiKey)

Optional PE43703 or PE4302 Output Attenuator (from eBay)

Domestic Sat RX or MiniTiouner and PC as described in 1 or 2 above

===6. Repeater Streaming from a Portsdown===

The Portsdown software is capable of providing a stand-alone unattended streamer for repeaters. Although initial configuration requires a laptop or PC, once set up no such control is required. The minimum equipment required for streaming is:

Raspberry Pi 3 Computer and power supply

SD Card (available from BATC Shop https://batc.org.uk/shop/portsdowntc)

EasyCap composite video capture dongle (available from BATC Shop https://batc.org.uk/shop/portsdowntc)

G8GKQ 14 August 2017