8-Band Decoder - Revision history

G8GKQ: /* Introduction */

2021-09-08T19:30:14Z

Introduction

G8GTZ: /* Setting the VCO Filter for Transverter Bands - Portsdown 2018 only */

2021-07-02T10:21:30Z

Setting the VCO Filter for Transverter Bands - Portsdown 2018 only

G8GTZ: /* Wiring */

2021-07-02T10:21:18Z

Wiring

G8GTZ: /* Setting the VCO Filter for Transverter Bands */

2021-07-02T10:19:36Z

Setting the VCO Filter for Transverter Bands

G8GTZ at 09:24, 7 March 2019

2019-03-07T09:24:37Z

G8GTZ: /* Introduction */

2019-03-07T09:23:53Z

Introduction

G8GKQ: /* Wiring */

2018-11-30T10:59:15Z

Wiring

G8GKQ at 16:32, 18 March 2018

2018-03-18T16:32:23Z

G8GKQ at 16:31, 18 March 2018

2018-03-18T16:31:10Z

G4FRE: /* Setting the VCO Filter for Transverter Bands */

2018-03-18T12:04:18Z

Setting the VCO Filter for Transverter Bands

@@ Line 1: / Line 1: @@
 ===Introduction===
-This Portsdwon 8-band decoder and PTT steering module is designed to work with the 8-band RF output switch. [[8-Band RF Output Switch|See this page]] for more details.
+This Portsdown 8-band decoder and PTT steering module is designed to work with the 8-band RF output switch. [[8-Band RF Output Switch|See this page]] for more details.
 It will provide switching signals (either always on, or PTT activated) to 4 power amplifiers and 4 transverters, and it also enables you to set which VCO filter should be switched in for the 4 transverter outputs. PCBs will be available from the BATC Shop.

← Older revision		Revision as of 10:21, 2 July 2021
Line 38:		Line 38:

	=== Setting the VCO Filter for Transverter Bands - Portsdown 2018 only===		=== Setting the VCO Filter for Transverter Bands - Portsdown 2018 only===
		+
		+	One of the reasons for using a PIC on this PCB is to allow the Portsdown 2017 LO Filter to be set correctly for the Transverter bands.

	The 8 DIP switches (or solder bridges if the switch is not fitted) need programming depending on the IF frequency used for each transverter.		The 8 DIP switches (or solder bridges if the switch is not fitted) need programming depending on the IF frequency used for each transverter.

← Older revision		Revision as of 10:21, 2 July 2021
Line 22:		Line 22:

	Alternatively, programmed PICs may be available from the BATC Shop.		Alternatively, programmed PICs may be available from the BATC Shop.
		+
		+	=== SW1===
		+
		+	The switch is not required when using Lime SDR or Pluto and can be left off the PCB.

	===Wiring===		===Wiring===

@@ Line 33: / Line 33: @@
 The PTT Jumper determines whether the Band Outputs are only active on transmit, or are active all the time.
-=== Setting the VCO Filter for Transverter Bands===
+=== Setting the VCO Filter for Transverter Bands - Portsdown 2018 only===
-One of the reasons for using a PIC on this PCB is to allow the LO Filter to be set correctly for the Transverter bands.  The 8 DIP switches (or solder bridges if the switch is not fitted) need programming depending on the IF frequency used for each transverter.
+The 8 DIP switches (or solder bridges if the switch is not fitted) need programming depending on the IF frequency used for each transverter.
 The board is marked with T1, T2, T3 and T4 to designate the pair of switches for each transverter; it is also marked with LSB (nearest J2) and MSB (nearest J3)  Use the following table to determine the settings for each transverter.

@@ Line 1: / Line 1: @@
 ===Introduction===
-This 8-band decoder and PTT steering module is designed to work with the 8-band RF output switch and the "Portsdown 2018" software. [[8-Band RF Output Switch|See this page]] for more details.
+This Portsdwon 8-band decoder and PTT steering module is designed to work with the 8-band RF output switch. [[8-Band RF Output Switch|See this page]] for more details.
 It will provide switching signals (either always on, or PTT activated) to 4 power amplifiers and 4 transverters, and it also enables you to set which VCO filter should be switched in for the 4 transverter outputs. PCBs will be available from the BATC Shop.

← Older revision		Revision as of 10:59, 30 November 2018
Line 24:		Line 24:

	There are 3 logic input lines that run from the GPIO breakout board to J1: The LSB and the MSB come from the 4 band switch connector. The “T” (transverter) line comes from GPIO Pin 7 which you will find labelled as "Pin 7" of the Digithin connector of the GPIO breakout board. These 3 logic lines also need to be routed to the 8-way RF switch. The current consumption of the board is low, so it could be powered by 3v3 from the Raspberry Pi.		There are 3 logic input lines that run from the GPIO breakout board to J1: The LSB and the MSB come from the 4 band switch connector. The “T” (transverter) line comes from GPIO Pin 7 which you will find labelled as "Pin 7" of the Digithin connector of the GPIO breakout board. These 3 logic lines also need to be routed to the 8-way RF switch. The current consumption of the board is low, so it could be powered by 3v3 from the Raspberry Pi.
		+
		+	'''To overcome a bug that was introduced with the Stretch Operating system, a 10K resistor should be added between “T” (transverter) line and ground'''. This will prevent the spurious selection of transverter mode at the end of each transmission.

	You will also need to run two wires from J2 of the 8-Band Decoder board to J3 on the VCO LO filter board, as these should no longer be directly controlled by the RPi.		You will also need to run two wires from J2 of the 8-Band Decoder board to J3 on the VCO LO filter board, as these should no longer be directly controlled by the RPi.

@@ Line 7: / Line 7: @@
 The firmware for the 16F883 PIC is available here: https://github.com/BritishAmateurTelevisionClub/8-Band-Decode.
-The schematic is here:[[Media:8 BAND DECODE V2-0 SCH.pdf|Circuit Schematic]]
+The schematic is here:[[Media:8 BAND DECODE V2-0 SCH.pdf| Circuit Schematic]]
-The board layout is here:[[Media:8 BAND DECODE V2-0 SS.pdf]]
+The board layout is here:[[Media:8 BAND DECODE V2-0 SS.pdf| Board Layout]]
 The parts list, which is currently provisional, and only checked against the DigiKey Part Numbers, is here: [[:File:8 BAND DECODE PARTS.xls]]
-A drill template for the board (which has been designed to be a form and fit replacement for the 4-band decoder) is here: [[Media:8 BAND DECODE V2-0 DRILL TEMPLATE.pdf]]
+A drill template for the board (which has been designed to be a form and fit replacement for the 4-band decoder) is here: [[Media:8 BAND DECODE V2-0 DRILL TEMPLATE.pdf| Drill Template]]
 ===PIC Programming===