Don, That was the leading suspect in my mind. But I tried very hard to assure they were correct when I set them up. I still don't grasp why the upper band was correct and the lower were opposite. I realize there is an inversion of side bands up there but I thought it was a simple inversion which to me means they should have behaved as did the lower but maybe opposite from the lower on receive and transmit.
I will follow your instructions and see how they work out. As always, thank you for your assistance. Take pride in the USA. 73 Jim, W0EM >________________________________ >From: Don Wilhelm <w3...@embarqmail.com> >To: Jim Harris <jim.w...@yahoo.com> >Cc: Elecraft Email <elecraft@mailman.qth.net> >Sent: Sunday, July 17, 2011 10:52 AM >Subject: Re: [Elecraft] K2 Problem in NAQP > >Jim, > >I suspect you have the sidebands inverted in your RTTY filter set. > >Do the following with the K2 set to a band lower than 15 meters, > >First set the FL1 filter to use the OP1 filter on the KSB2 board, and that >filter along with its BFO settings will be used for transmit. Set RTTY the >same as your SSB FL1 settings - the BFO setting for RTTY should be the same as >LSB, and the RTTYr BFO should be the same as USB. > >The other filters are created from the variable bandwidth filter. I usually >set FL2 to 1.00, FL3 to 0.70, FL4 to 0.40, and center these 3 filters at 1000 >Hz. - use Spectrogram >MMTTY mark frequency is set at 915 Hz to be compatible. > >Check the BFO frequencies for RTTY and RTTYr - normally the RTTY BFO frequency >will be in the vicinity of 4914.xx and the RTTYr BFO will be near 4912.xx if >you are using 1000 Hz as the center frequency. > >Higher center frequencies may be possible, but you may run into difficulty >with limits of the BFO range for RTTYr. > >The K2 reverses its mixing scheme on 15 meters and above - below 15 meters the >VFO and BFO subtract while on 15 and above the VFO and BFO add. The K2 >automatically swaps sidebands for you, but it will not come out right on all >bands if the sidebands have been inverted in the filter settings. > >73, >Don W3FPR > > > >On 7/17/2011 11:14 AM, Jim Harris wrote: >> Hi Folks, >> >> I ran into a problem during the just completed NAQP RTTY contest with my >> Elecraft K2. To make a very long and frustrating story short, on at least >> 20 and 40 meters it receives on the lower side band but transmits on the >> upper sideband. On 15 meters it receives and transmits on the same >> sideband which appears to be the lower sideband. The only way I was able to >> get it to transmit on the same sideband on the two bands mentioned was to >> put the radio into RTTY reverse (with CW REV) and then operate MMTTY in >> REV. As a result of the problem I lost about three hours in the contest >> while troubleshooting the problem. If someone can shed (and I'm sure they >> can) some light on this perplexity, I would very much appreciate it. >> >> This was my first serious attempt to do SO2R. I used my K3 for the right >> radio and the K2 for the left. I had aligned the RTTY filters in the K2 >> using the procedures found on the internet and used Spectogram. I tried to >> be careful to set them on the correct sideband. I can accept that maybe I >> didn't get that done right and will recheck them. But, I don't understand >> why the upper band is correct and the lower bands are not. >> >> > > > ______________________________________________________________ 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
