I own a JPS NIR 12. As well as that operated when I first got it, I found that it was inferior to the AF DSP in the K2. The K3, with the entire IF available to drive its functions, at the IF level, is superior to both the K2 and particularly superior to my NIR 12. The only thing that I can imagine the JPS unit doing is adding to the inevitable artifacts of DSP processing.
If you actually do find that the JPS adds something positive to the results please let me know, I'd like to try and duplicate it. I've not found anything useful for it to do in a long time. 73, Guy. On Wed, Jan 11, 2012 at 12:44 PM, Jim Harris <jim.w...@yahoo.com> wrote: > Hi to everyone, > Some may recall that a couple of weeks ago I asked about hooking up a JPS > NIR-12 DSP between my K3 and computer for RTTY contesting. The idea was to > try to clean up the signal a bit more before the sound card prcesses it. I > under took this after learning that at least one prominent RTTY contester > does this with excellent results. But, for me, in a few words it didn't > work out very well even though I tested it prior to the RTTY Roundup > contest. There may have been some extenuating circumstances as after again > hooking the audio straight from the K3 to the computer there still seemed > to be some muddiness without totally clean decoding. I will have to do > some more troubleshooting on that. Once I get that sorted out I am going to > try the DSP again. If I make progress I will report back for those > interested. > I might add that the K3 with my K2 in a SO2R combination was not a total > disaster as I had 917 contacts in about 18 hours of operating. I used a > Heathkit active filter between the K2 and the computer and found it greatly > helped clean up the audio making decode in MMTTY the best I've seen in some > years of RTTY contesting. I used it in combination with some DSP > processing and XFIL RF3 in the K2. It would have been nice if the MMTTY > decoding of the K3 audio had been as good. > Sorry for the bandwidth, but one thing I might add. I use ear buds with a > small commercially available combiner box to listen to the audio from each > radio. Shortly before the contest I realized I had a giant ground loop > someplace. After trouble shooting I found it was caused by the box > grounding the two radio's together. A hastily put together isolation > transformer solved that. > Constructive thought and comments always appreciated. > > Take pride in the USA. 73 > > > > Jim, W0EM > ______________________________________________________________ > 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
