After looking at the different upconverters, I decided to try the CT1FFU device[1] first.
The marketing says it is available with either 106.25 MHz or 65.520 MHz LO. The manual[2] only mentions a 106.25 MHz LO I was initially using the offset -106.25 in the gqrx configuration. I wasn't receiving anything, so I started to investigate: - the RTL-SDR doesn't see anything on 106.25 - the upconverter I received has a 40 MHz oscillator on the board in the same place as the 106.25 oscillator 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 or GNU Radio in general 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 further? 1. http://www.rtl-sdr.com/version-5-0-of-the-ct1ffu-upconverter-now-available/ 2. http://www.ct1ffu.com/site/images/stories/FCD5a.pdf _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
