I'm not sure why you would think this is a problem, the "other side" signal is removed by the I/Q decoding technique, not by filtering. The filters do the job of roofing filters, reducing and removing near in strong signals -- from the IF signal that just happens now to be at baseband frequencies.
If I'm missing something, please educate me on what I'm missing? - Brendon KK6AYI On Mon, Jan 9, 2017 at 10:24 AM, K9MA <[email protected]> wrote: > The KX3 "roofing filters" are audio filters. (I wouldn't even call them > "roofing" filters.) They are analog filters, which can improve rejection > of adjacent signals which might overload the ADC. They will not, however, > reject the "audio image", on the other side of zero beat. I'd expect, > especially during contests, the the effect would show up once in a while, > probably making a weak signal totally unintelligible. Has anyone noticed > this effect? Especially on CW, it would be fairly unlikely, as the > interfering signal would have to fall within the narrow passband on the > other side of zero beat. > > 73, > > Scott K9MA > > > On 1/9/2017 11:54, Ignacy wrote: > >> Perhaps as it should be. A bigger and more expensive radio is a better >> radio >> but one cannot take the bigger radio everywhere. I assume you had roofing >> filters in KX3. >> >> I used KX3 directly driving Expert 1.3k for at Easter Island during CQ WW >> SSB and a few days later in CW. KX3 was reliable and worked pretty well. >> But >> I had a feeling that discerning call signs in pileups was a bit worse in >> KX3. Also, a better speech processor makes K3 about 1-2 S stronger than >> KX3 >> at same peak power so no one can win a SSB contest with KX3. But KX3 is >> about 20% weight and 10% of volume. >> >> Ignacy, NO9E >> >> >> >> -- >> View this message in context: http://elecraft.365791.n2.nabb >> le.com/kx3-receiver-versus-K3s-receiver-tp7625537p7625595.html >> Sent from the Elecraft mailing list archive at Nabble.com. >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [email protected] >> > > > -- > Scott K9MA > > [email protected] > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
