开云体育

Which is a wideband IF convertor from 40.455 MHz to 21.4 MHz and appears to be useful for using a panadapter with any of the 40.455MHz first IF receivers such as the RA6790/GM and the RA1792.? It does physically fit in the space in those where the ISB card or 100 kHz IF converter fits.

If anyone has any details, such as supply voltage(s) needed I'd be grateful, and I guess tracing out the schematic will keep me quiet for at least a week :^)

73 - Dan

ac6ao - g3ncr

Answering my own query...? It is indeed a wideband IF converter from 40.455 MHz to 21.4 MHz, designed to cope with a very wide range of signal levels.? It takes the IF input from before the first mixer roofing filter, amplifies that, and splits it.? One half returns to the receiver roofer, the other goes to a filter and +23 dBm level mixer fed by a 61.855 TCXO to give a 21.4 MHz 500 kHz wide spectrum.? Lots of LC filtering at various points and provision on the PCB for pads to set levels.? It runs off a single 15V supply.?? I shudder to think what this cost, the price of the high level MCL mixer alone is more than I paid for the whole thing.

Dan

ac6ao / g3ncr