I think that in gqrx you shoud use th LO frequency, which in your case is: +106.25 and not -106.25 73 Apostolos On Δευ, 2016-04-18 at 17:04 +0200, Daniel Pocock wrote: > > I'm trying out gqrx 2.5.1-1~bpo8+1 from backports > > It is receiving 2m and 70cm with the RTL-SDR stick > > I added the CT1FFU upconverter and so far haven't received anything from > HF-land > > The upconverter manual[1] says it has a 106.25 MHz local oscillator, so > I was initially using the value -106.25 in the gqrx configuration. I > subsequently discovered the manual is wrong: > - the RTL-SDR doesn't see anything on 106.25 > - the upconverter I received has a 40 MHz crystal on the board in the > same place as the 106.25 crystal in the photo > - the RTL-SDR detects the 40 MHz signal and if I pull the power from the > upconverter, the 40 MHz signal disappears > > Using -40.0 MHz in the gqrx config, I still don't find anything on HF though > > Are there any known issues with gqrx with this type of setup? > > Is it necessary to add band pass filters or LNAs with the upconverters > or should they work standalone? > > Can anybody make any other comments on testing it? > > > > 1. http://www.ct1ffu.com/site/images/stories/FCD5a.pdf >
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