If your radio is doing it, you will hear that on ALL loud radio signals. This would be especially true of the carrier on AM broadcast stations. If only on one signal, it's their problem.
There are a LOT of transmitters that have transmitted frequencies well down besides the main transmission. A common one, heard on analog transmitters that are using a keyed audio tone through SSB circuitry to reduce manufacturing cost, is carrier balance in the balanced modulator, and ultimate filter rejection of the other sideband. These could be anywhere between 700 and 4000 Hz away depending on the circuit and settings. Your K3 does not do this (transmit artifacts of analog SSB generation) because it is digital and does not have a balanced modulator. 15 kHz SSB is generated by the transmit DAC directly from a number stream created by a firmware algorithm from the audio number stream created by running microphone audio through an analog to digital chip. The slightly unbalanced carrier and the opposite sideband that allow the analog artifacts simply do not exist anywhere. For a while the K3 TX had a clean and coherent microphonic spur on CW when using the MON tone and the internal speaker on CW. This has been remedied for some time now (see "stiffener" mod). 73, Guy. On Sat, Jan 8, 2011 at 5:29 AM, OE5CSP-Chris <hans-christ...@gmx.at> wrote: > > Hi, > > During the Christmas holidays I spent a lot of time on 80m and I came across > the problem mentioned on the reflector some time ago.Sometimes I can hear a > strong station twice.Yesterday,for example I heard a strong German station > on 3514 and a few khz down I heard the same signal again, but much weaker.I > did not use the NB or NR. This happened a few times already.Is this a known > issue and will it be fixed in the next firmware release? > > 73,Chris-OE5CSP > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/K3-Hears-stations-twice-tp5865819p5902107.html > Sent from the [K3] 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:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
