BATC Forum

How about DATV repeaters transmitting two simultaneous signals say, one at 1000s/r so that it can be received on a set top box and the other at 333 or 125 s/r for the fringe receivers like myself? The carriers can be very close together - I have done this on 23cms terrestrial TV and also via Es'Hail with very good results. I didn't see any application at the time - I just wanted to try it!

I used two portsdown transmitters fed into a 23cms splitter combiner via variable attenuators into one power amplifier.

I will do some more experiments here between myself here in Kettering and Arthur G4CPE in Luton next week.

This would hopefully make a big increase in DATV repeater useage and encourage more people into DATV

Just done some longer distance testing with Arthur G4CPE and Steve M0SKM between Kettering and Luton with 2 channels 1MHz apart , one on 437MHz 1000s/r together with 436MHz at 333 s/r both transmitted through the same PA with very good results and no degradation of either signal.
Therefore it should work with repeater outputs and I would suggest two symbol rates; 1000 for 99.99% of set top box receivers and 125 s/r to vastly increase the coverage area albeit with lower quality.