Hello to the group,
I plan to use the two types ( OCXO /GPS) of Amsat downconverters to listen to the NB transponder in a first step ;
for this, the LNB signal is injected in the upper left F connector and the 144 Mhz signal comes from the upper right bnc connector.
The jumpers voltage are in position 'by default' and the 4 leds on the right side of the pcb are illuminated except the 3rd one (green) which is blinking.
The output frequency selection is on 6 which corresponds to 144.550 Mhz.There is hiss but no audio.
What am i doing wrong ?