Difference between revisions of "The Portsdown DATV transceiver system"

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[[File:KLB portsdown (10).JPG|400px|center]]
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The Portsdown DATV transceiver project provides an easy way to “get on air” with Digital ATV at a relatively low cost covering all of the commonly used DATV modes enabling it to be used for cross town QSOs, accessing ATV repeaters and for working the DX using Reduced bandwidth (RB-TV) modes.
  
 
==Introduction==
 
==Introduction==
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The aim of the Portsdown project is to enable an amateur radio operator with little or no knowledge of Digital ATV to construct the hardware elements, load and configure the software and use the system to send live Digital ATV signals across town on his existing aerials.  
 
The aim of the Portsdown project is to enable an amateur radio operator with little or no knowledge of Digital ATV to construct the hardware elements, load and configure the software and use the system to send live Digital ATV signals across town on his existing aerials.  
  
'''New builders are recommended to build a Portsdown 4 which, when used with a Adalm Pluto, is integrated with the Langstone Microwave transceiver software enabling an advanced multimode narrow band and DATV transceiver covering 70Mhz to 6GHz for under £350.
+
'''New builders are recommended to build a Portsdown 4 which, when used with an Adalm Pluto, is integrated with the Langstone Microwave transceiver software enabling an advanced multimode narrowband and DATV transceiver covering 70Mhz to 6GHz for under £350.  Full details on the Portsdown 4 [[Portsdown 4|are on this wiki page]].  
 
'''
 
'''
  
The Portsdown DATV transmitter project provides an easy way to “get on air” with Digital ATV at a relatively low cost covering all of the commonly used DATV modes enabling it to be used for cross town QSOs, accessing ATV repeaters and for working the DX using Reduced bandwidth (RB-TV) modes.
+
==Outline specification==
  
The project, which was featured in the June 2017 issue of the [http://rsgb.org/main/publications-archives/radcom/ RSGB's Radcom magazine], involves some basic construction and is based around a Raspberry Pi with a touchscreen and uses a LimeSDR Mini - before January 2019 the Portsdown used a custom filter modulator card and external local oscillator.
+
Outline specification of the Portsdown 4 system is as follows:
  
Outline specification of the Portsdown system is as follows:
+
• Frequency coverage depends on the SDR used but covers 50, 71, 146 MHz, 437 MHz, 23cms, 13cms and 3.4GHz bands.
 +
 
 +
• MPEG-2 and MPEG-4 (H264) video encoding
  
Frequency coverage of the 50, 71, 146 MHz, 437 MHz, 23cms, 13cms and 3.4GHz ATV bands when using LimeSDR mini
+
DVB-S, DVB-S2 and DVB-t transmission and reception
  
MPEG-2 and MPEG-4 (H264) video encoding
+
DATV receiver capabilities using external MiniTiouner hardware
  
• Cost-effective stand-alone (not PC based) Digital TV Transmit solution
+
• Cost-effective stand-alone (not PC based) Digital TV Transmit and receive solution
  
 
• Wide range of Symbol rates from 125 Ks to 4Ms* including Reduced Bandwidth (RB-TV) modes and “normal” DATV modes
 
• Wide range of Symbol rates from 125 Ks to 4Ms* including Reduced Bandwidth (RB-TV) modes and “normal” DATV modes
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• Fully documented and supported including easy software installation and upgrades
 
• Fully documented and supported including easy software installation and upgrades
 
•      Can be received on a standard Free to air satellite receiver
 
  
 
==System overview==
 
==System overview==
  
At the heart of the The Portsdown Transmitter is a Raspberry Pi (RPi) computer running a BATC customised version of the F5OEO rpidatv software.  
+
At the heart of the Portsdown system is a Raspberry Pi (RPi) computer running a BATC customised version of the F5OEO rpidatv software.  
  
 
The choice of the RPi is primarily due to the fact that it has an on-board MPEG-4 (H264) encoder and the versatile hardware interface (GPIO) capabilities.  
 
The choice of the RPi is primarily due to the fact that it has an on-board MPEG-4 (H264) encoder and the versatile hardware interface (GPIO) capabilities.  
  
A touch screen interface enables the system to be used as a standalone unit without further need to connect up keyboard and mouse.  If the LCD is not available, the system can be controlled by using an external PC connected over a wired or wi-fi network (console mode). 
+
[[File:Portsdown 4 Block.PNG|500px]]
 
 
[[File:20200215 Portsdown 2020 Block.jpg|600px]]
 
  
  
====Touch screen control====
+
A touch screen interface enables the system to be used as a standalone unit without further need to connect up keyboard and mouse.  If the LCD is not available, the system can be controlled by using an external PC connected over a wired or wi-fi network (console mode). 
  
[[File:Menu1.jpg|480px]]
+
[[File:P4menu1.jpg|484px]]
  
 
====RF Generator and DATV Modulator====
 
====RF Generator and DATV Modulator====
  
Depending on version (see below) the output from the RPi is connected to one of the following units.  A BATC Filter Modulator board, LimeSDR Mini or an Adalm Pluto, which modulates the RF carrier and produces the DVB-S or DVB-S2 DATV signal.
+
Depending on the version (see below) the output from the RPi is connected to one of the following units which modulates the RF carrier and produces the DVB-S or DVB-S2 DATV signal.
 +
 
 +
* BATC Filter Modulator board - first used in Portsdown 2018 Classic but no longer available
 +
* DATV Express Board - first used in Portsdown 2018 Classic but no longer available
 +
* LimeSDR (Mini or USB)
 +
* Adalm Pluto
  
 
====Audio and video inputs====
 
====Audio and video inputs====
  
The Portsdown transmitter will take audio and video inputs from the RPi camera, an EasyCap composite video USB dongle, C920 webcam and a USB sound card / dongle - all these are readily available from ebay and Amazon.  More details are here: [[Portsdown Video Sources]].
+
The Portsdown transmitter will take audio and video inputs from the RPi camera, an EasyCap composite video USB dongle, C920 webcam and a USB sound card / dongle - all these are readily available from ebay and Amazon.
  
 
====Portsdown DATV receiver====
 
====Portsdown DATV receiver====
  
On Portsdown 2020 and Portsdown 4, if you plug your MiniTuioner hardware into the RPi USB port and select "Rx" on the top level menu, you will have access to a fully functional DATV receiver.
+
On Portsdown 2020 and Portsdown 4, if you plug your [[MiniTioune|MiniTuioner USB receiver hardware]] into the RPi USB port and select "Rx" on the top level menu, you will have access to a fully functional DATV receiver.
 +
 
 +
The received signal is displayed on the 7" touch screen.  It is also available as a UDP output on the network enabling it to be viewed on a larger PC using VLC or a similar software.
 +
 
 +
For more details on DATV receptions see [[DVB-S/S2 Reception|https://wiki.batc.org.uk/DVB-S/S2_Reception]]
 +
 
 +
====Portsdown Test Equipment====
 +
 
 +
The Portsdown 4 includes some test equipment features.
 +
 
 +
The Signal Generator is decribed here: [[Portsdown_4_Signal_Generator]].
 +
 
 +
The Band Viewer is described here: [[Portsdown_Band_Viewer]].
 +
 
 +
The Power Meter is described in CQ-TV 273.
 +
 
 +
The Noise Figure Meter is still under development but is described here [[Portsdown NF Meter]]
 +
 
 +
The Frequency Sweeper is still under development but is described here [[Portsdown Sweeper]]
 +
 
 +
The XY Display is described here: [[Portsdown_XY_Display]].
  
The received signal is displayed on the 7" touch screen but is also available as a UDP output on the network enabling it to be viewed on a larger PC using VLC or a similar software.
+
==Further information==
  
==Portsdown Evolution==
+
===Portsdown Hardware===
 +
 
 +
Full details of all the hardware required to build a Portsdown system is listed here [[Portsdown hardware]]
  
There are now 4 distinct Portsdown versions:
+
===Technical Index===
  
===Portsdown 2018 Classic===
+
An index of technical reference pages for the Portsdown system can be found here [[Portsdown Technical Index]].
  
The original version was launched in 2017 - [[Portsdown 2018]].  It was based on the Raspbian Jessie operating system running on a Raspberry Pi 3 with a 3.5 inch touchscreen.  It used the BATC-supplied Filter-Modulator board and could take video from the Raspberry Pi Camera or the EasyCap.  It would transmit DVB-S MPEG-2 with audio, or H264 without audio. 
+
==Portsdown Evolution==
  
This version is no longer supported, although it will continue to work as built.
+
There are now 4 distinct Portsdown versions:
  
===Portsdown 2019 Stretch===
+
===Portsdown 4===
  
This was the second version, using the Raspbian Stretch Operating System - [[Portsdown 2019]].  Support for the 7 inch touchscreen was added and some WebCams could also be used as a video sourceAudio capability was added for H264 encoding, and early support was provided for the LimeSDR Mini.
+
The latest version of the Portsdown is the [[Portsdown 4]].  This uses the Raspios Buster operating system on a Raspberry Pi 4 with a 7 inch screen and a LimeSDR or ADALM PlutoUnlike the previous version changes, it does not maintain hardware compatibility with the classic (filter-modulator) Portsdown.
  
Later versions also supported the LongMynd receive software enabling good DATV reception using a MiniTiouner.
+
'''New builders are recommended to build a Portsdown 4 which, when used with a Adalm Pluto, is integrated with the Langstone Microwave transceiver software enabling an advanced multimode narrowband and DATV transceiver covering 70 MHz to 4 GHz for under £500.
 +
'''
  
Again, this version is no longer supported, although it will continue to work as built.
+
The first release of the Portsdown 4 was in late July 2020.  Constructors can build their own SD Cards using the install file on GitHub [https://github.com/BritishAmateurTelevisionClub/portsdown4 BATC Portsdown 4 GitHub Page].  Pre-programmed SD Cards are also available from the BATC Shop.
  
 
===Portsdown 2020 Buster===
 
===Portsdown 2020 Buster===
  
The current in-use version of the Portsdown is Buster 2020 - [[Portsdown 2020]].  This introduces support for the LimeDVB firmware on the LimeSDR Mini and also supports the use of standard firmware on the LimeSDR USB and the LimeNET Micro.   
+
The Portsdown 2020 is Rpi3 based running Buster operating system - [[Portsdown 2020]].  This introduces support for the LimeDVB firmware on the LimeSDR Mini and also supports the use of standard firmware on the LimeSDR USB and the LimeNET Micro.   
  
 
The LongMynd receive capability has been improved with the addition of a player that will display some H265 signals.  It will also control an external Jetson Nano with an HDMI capture device to allow the transmission of high definition H265 signals.   
 
The LongMynd receive capability has been improved with the addition of a player that will display some H265 signals.  It will also control an external Jetson Nano with an HDMI capture device to allow the transmission of high definition H265 signals.   
Line 90: Line 117:
 
This version will continue to be actively supported while the Buster operating system is current for the Raspberry Pi.  No date has yet been set for the release of the next operating system version (Bullseye).
 
This version will continue to be actively supported while the Buster operating system is current for the Raspberry Pi.  No date has yet been set for the release of the next operating system version (Bullseye).
  
===Portsdown 4===
+
===Portsdown 2019 Stretch===
 +
 
 +
This was the second version, using the Raspbian Stretch Operating System - [[Portsdown 2019]].  Support for the 7 inch touchscreen was added and some WebCams could also be used as a video source.  Audio capability was added for H264 encoding, and early support was provided for the LimeSDR Mini. 
 +
 
 +
Later versions also supported the LongMynd receive software enabling good DATV reception using a MiniTiouner. 
  
The latest version of the Portsdown is the Portsdown 4 - [[Portsdown 4]].  This uses the Raspios Buster operating system on a Raspberry Pi 4 with a 7 inch screen and a LimeSDR.  Unlike the previous version changes it does not maintain hardware compatibility with the classic (filter-modulator) Portsdown.
+
Again, this version is no longer supported, although it will continue to work as built.
  
'''New builders are recommended to build a Portsdown 4 which, when used with a Adalm Pluto, is integrated with the Langstone Microwave transceiver software enabling an advanced multimode narrowband and DATV transceiver covering 70Mhz to 6GHz for under £500.
+
===Portsdown 2018 Classic===
'''
+
 
 +
The original version was launched in 2017 - [[Portsdown 2018]].  It was based on the Raspbian Jessie operating system running on a Raspberry Pi 3 with a 3.5 inch touchscreen.  It used the BATC-supplied Filter-Modulator board and could take video from the Raspberry Pi Camera or the EasyCap. It would transmit DVB-S MPEG-2 with audio, or H264 without audio. 
  
The first release of the Portsdown 4 was in late July 2020.  Constructors can build their own SD Cards using the install file on GitHub [https://github.com/BritishAmateurTelevisionClub/portsdown4 BATC Portsdown 4 GitHub Page].  Pre-programmed SD Cards are also available from the BATC Shop.
+
This version is no longer supported, although it will continue to work as built.

Revision as of 21:33, 23 November 2021


The Portsdown DATV transceiver project provides an easy way to “get on air” with Digital ATV at a relatively low cost covering all of the commonly used DATV modes enabling it to be used for cross town QSOs, accessing ATV repeaters and for working the DX using Reduced bandwidth (RB-TV) modes.

Introduction

The aim of the Portsdown project is to enable an amateur radio operator with little or no knowledge of Digital ATV to construct the hardware elements, load and configure the software and use the system to send live Digital ATV signals across town on his existing aerials.

New builders are recommended to build a Portsdown 4 which, when used with an Adalm Pluto, is integrated with the Langstone Microwave transceiver software enabling an advanced multimode narrowband and DATV transceiver covering 70Mhz to 6GHz for under £350. Full details on the Portsdown 4 are on this wiki page.

Outline specification

Outline specification of the Portsdown 4 system is as follows:

• Frequency coverage depends on the SDR used but covers 50, 71, 146 MHz, 437 MHz, 23cms, 13cms and 3.4GHz bands.

• MPEG-2 and MPEG-4 (H264) video encoding

• DVB-S, DVB-S2 and DVB-t transmission and reception

• DATV receiver capabilities using external MiniTiouner hardware

• Cost-effective stand-alone (not PC based) Digital TV Transmit and receive solution

• Wide range of Symbol rates from 125 Ks to 4Ms* including Reduced Bandwidth (RB-TV) modes and “normal” DATV modes

• Analogue video input to allow use of camcorders and mixing desks

• Use of commonly available components and modules

• Modular construction enabling a step-by-step system build and easy trouble shooting

• Designed to encourage home construction and requiring an average skill level

• Fully documented and supported including easy software installation and upgrades

System overview

At the heart of the Portsdown system is a Raspberry Pi (RPi) computer running a BATC customised version of the F5OEO rpidatv software.

The choice of the RPi is primarily due to the fact that it has an on-board MPEG-4 (H264) encoder and the versatile hardware interface (GPIO) capabilities.

Portsdown 4 Block.PNG


A touch screen interface enables the system to be used as a standalone unit without further need to connect up keyboard and mouse. If the LCD is not available, the system can be controlled by using an external PC connected over a wired or wi-fi network (console mode).

P4menu1.jpg

RF Generator and DATV Modulator

Depending on the version (see below) the output from the RPi is connected to one of the following units which modulates the RF carrier and produces the DVB-S or DVB-S2 DATV signal.

  • BATC Filter Modulator board - first used in Portsdown 2018 Classic but no longer available
  • DATV Express Board - first used in Portsdown 2018 Classic but no longer available
  • LimeSDR (Mini or USB)
  • Adalm Pluto

Audio and video inputs

The Portsdown transmitter will take audio and video inputs from the RPi camera, an EasyCap composite video USB dongle, C920 webcam and a USB sound card / dongle - all these are readily available from ebay and Amazon.

Portsdown DATV receiver

On Portsdown 2020 and Portsdown 4, if you plug your MiniTuioner USB receiver hardware into the RPi USB port and select "Rx" on the top level menu, you will have access to a fully functional DATV receiver.

The received signal is displayed on the 7" touch screen. It is also available as a UDP output on the network enabling it to be viewed on a larger PC using VLC or a similar software.

For more details on DATV receptions see https://wiki.batc.org.uk/DVB-S/S2_Reception

Portsdown Test Equipment

The Portsdown 4 includes some test equipment features.

The Signal Generator is decribed here: Portsdown_4_Signal_Generator.

The Band Viewer is described here: Portsdown_Band_Viewer.

The Power Meter is described in CQ-TV 273.

The Noise Figure Meter is still under development but is described here Portsdown NF Meter

The Frequency Sweeper is still under development but is described here Portsdown Sweeper

The XY Display is described here: Portsdown_XY_Display.

Further information

Portsdown Hardware

Full details of all the hardware required to build a Portsdown system is listed here Portsdown hardware

Technical Index

An index of technical reference pages for the Portsdown system can be found here Portsdown Technical Index.

Portsdown Evolution

There are now 4 distinct Portsdown versions:

Portsdown 4

The latest version of the Portsdown is the Portsdown 4. This uses the Raspios Buster operating system on a Raspberry Pi 4 with a 7 inch screen and a LimeSDR or ADALM Pluto. Unlike the previous version changes, it does not maintain hardware compatibility with the classic (filter-modulator) Portsdown.

New builders are recommended to build a Portsdown 4 which, when used with a Adalm Pluto, is integrated with the Langstone Microwave transceiver software enabling an advanced multimode narrowband and DATV transceiver covering 70 MHz to 4 GHz for under £500.

The first release of the Portsdown 4 was in late July 2020. Constructors can build their own SD Cards using the install file on GitHub BATC Portsdown 4 GitHub Page. Pre-programmed SD Cards are also available from the BATC Shop.

Portsdown 2020 Buster

The Portsdown 2020 is Rpi3 based running Buster operating system - Portsdown 2020. This introduces support for the LimeDVB firmware on the LimeSDR Mini and also supports the use of standard firmware on the LimeSDR USB and the LimeNET Micro.

The LongMynd receive capability has been improved with the addition of a player that will display some H265 signals. It will also control an external Jetson Nano with an HDMI capture device to allow the transmission of high definition H265 signals.

This version will continue to be actively supported while the Buster operating system is current for the Raspberry Pi. No date has yet been set for the release of the next operating system version (Bullseye).

Portsdown 2019 Stretch

This was the second version, using the Raspbian Stretch Operating System - Portsdown 2019. Support for the 7 inch touchscreen was added and some WebCams could also be used as a video source. Audio capability was added for H264 encoding, and early support was provided for the LimeSDR Mini.

Later versions also supported the LongMynd receive software enabling good DATV reception using a MiniTiouner.

Again, this version is no longer supported, although it will continue to work as built.

Portsdown 2018 Classic

The original version was launched in 2017 - Portsdown 2018. It was based on the Raspbian Jessie operating system running on a Raspberry Pi 3 with a 3.5 inch touchscreen. It used the BATC-supplied Filter-Modulator board and could take video from the Raspberry Pi Camera or the EasyCap. It would transmit DVB-S MPEG-2 with audio, or H264 without audio.

This version is no longer supported, although it will continue to work as built.