I am trying to use this LNA:
Using these directions to turn on:
At first I thought the LNA was dead, as checking it on the bench with GQRX showed no results (even though I can measure 4.7v from the dongle when I “switch” the bias-t on using the command shown in the second link above. So I opened the LNA and hooked up a 4.5V power supply, and it works just dandy in GQRX!
So I turned on the Bias-t via the software switch, and while it was on and producting 4.7V, I opened GQRX. As soon as GQRX opened a connection to the dongle, the bias-t turned off. I suspect this is what is happening in my UHF station that I was testing this LNA in. Does anybody know how to keep the bias-t turned on when I launch GQRX? And even better, is there a way to get the satnogs client to switch it on and off before and after an observation? I was using the software commands in the pre/post observation script - but the observations were showing no active signal amplification so I think maybe when satnogs accesses the RTL-SDR it just switches off the bias-t just like GQRX?