Quote from: caulktel on August 17, 2018, 10:22:32 AM
Don't know if any of you have been following the debacle going on over at the bitx20.io group regarding the uBitx, but those few fortunate people who have quality Spectrum Analyzers and know how to use them, have found that the uBitx 'mostly' does not pass FCC specs, (US), for spectral purity, (some nasty spurs). Some are advising not to use them on the air until some kind of fix is figured out. Funny I have been using mine every since they came out and nobody has knocked at my door yet, but I don't want them to either. All of the EE's on the group are seeking to redesign the uBitx to meet specs. I find this whole thing to be rather disheartening after all the time and effort I put into my two radios. They are talking about cutting the traces going to the LPF section and adding a daughter board with a new LPF design to fixed the existing boards. Not quite sure what to do but wait and see what everybody comes up with. :( :-[ :-\
Joel
N6ALT
I own a µBitX but I'am not a subscriber of this group. Did they say anything about the frequencies of those spurs ? Are they over 30 MHz ? In this case, an external third order LPF (at the cost of a few dB of power loss) might do the job...
73's, Stan.