Comtech module
The Comtech modules sold initially by G1MFG are probably the most common analogue ATV equipment in use in the UK.
23cms and 13cms modules are still available from Roy G8CKN - email "antennas at tiscali.co.uk" for more details.
Modifications
There are numerous modifications to improve the video quality of the basic Comtech modules:
Alternatively the Solent receiver included some excellent video backend processing which can be used to improve Comtech by taking the baseband feed out of the tuner via a 68 ohm resistor directly in to this circuit (ignore TR3a and TR3C as not relevant to this application):
Solent Video processing circuit
Manuals and documentation:
23cms
- File:23cm Tx Rx FINAL.pdf including frequency switch settings
- File:23cm LCD controller V3 FINAL.pdf
- File:Comtech 23cms rx.pdf
- File:23cmTxModule.pdf
13cms
- File:13cmRxDwg.pdf
- File:13cm Advanced 1MHz FINAL.pdf
- File:13cm Tx 20mW FINAL.pdf
- File:13cmTxModule.pdf
- File:13cm LCD controller V31 FINAL.pdf
ENG and Microwave
- File:13cm LCD controller V31 FINAL.pdf
- File:23cm LCD controller V3 FINAL.pdf
- File:ENG controller instructions FINAL.pdf
- File:ENG_Rx_FINAL.pdf
- File:Microwave Receiver Controller Connections FINAL.pdf
- File:Microwave Receiver instructions FINAL.pdf
10 GHz
G1MFG Software
The 16F628 PIC hex software used in the G1MFG Comtech Modules sold for 23 cm, 13 cm and ENG (TX and RX) is in this zip file: File:G1MFG-Modules.zip
The LCD Controller hex software for these modules (also using the 16F628) is here File:G1MFG-LCD-controller.zip
Other Software
Hexcode for Comtech PIC from I2SDD is available here