Wayne, For folks that were using the two receivers for VHF EME polarity diversity reception over a wide bandwidth with MAP65 software, where they would have gain and phase matched preamps this must be an improvement for them.
I think it was not generally understood that the absolute value of the phase relationship of the receivers would change as the VFO was moved. The only person I know that is currently using his K3 for doing this is Ed KL7UW, so he may be interested in this. 73 David Anderson GM4JJJ > On 3 Mar 2015, at 02:21, Wayne Burdick <[email protected]> wrote: > > Some users of the new synthesizer have also reported an improvement in the > way diversity mode sounds. This is due to a change in the way the receivers > are driven by the synths. > > In diversity mode, as long as the main and sub crystal filter offsets are > matched, both receivers are driven by the main synth (the sub synth is not > used in this case). So, when the VFO is moved, the local oscillator phase > relationship remains stable between the main and sub receivers. > > With the original synths, moving the VFO even a small amount causes both the > main and sub synths to be updated. Since they use separate LC oscillators, > the phase relationship will change. The two will remain phase-locked to the > reference, but the absolute value of the phase between the two synths will be > some value between 0 and 180 degrees. > > We'll add this to the FAQ. > > 73, > Wayne > N6KR > > > >> On Mar 2, 2015, at 6:10 PM, Walter Underwood <[email protected]> wrote: >> >> Start with the FAQ here: >> http://www.elecraft.com/manual/KSYN3A%20FAQ-ver-C-2.pdf >> >> The original announcement on this list described it like this: >> >> The KSYN3A synthesizer module is a completely new design that improves on >> the original KSYN3 in several ways: >> >> ULTRA-LOW PHASE NOISE >> The KSYN3A significantly improves the K3's already excellent RX and TX phase >> noise at close carrier spacings. This in turn noticeably improves the K3's >> top performing close spaced Rx dynamic range, yielding even better weak >> signal detection in the presence of strong signals. >> >> FASTER CW BREAK-IN AND MORE ACCURATE CW ELEMENT TIMING >> >> EXCELLENT MECHANICAL STABILITY >> The KSYN3A is virtually immune to both physical vibration and magnetic >> coupling, and operates over a very wide temperature range. >> >> 600-METER COVERAGE >> The KSYN3A extends VFO tuning down to 100 kHz, with sensitivity gradually >> falling off below 450 kHz. Transmit output is as high as 1.0 mW for use with >> a suitable external amplifier. (Note: 600-m and below operation also >> requires the KBPF3 and KXV3 options.) >> >> wunder >> K6WRU >> CM87wj >> http://observer.wunderwood.org/ >> >>> On Mar 2, 2015, at 6:02 PM, James D. (Jimmy) Walker, Jr. via Elecraft >>> <[email protected]> wrote: >>> >>> Can someone please give me a summary of this synthesizer issue or a useful >>> link so I can understand all this conversation about new boards. I have a >>> three year old K-3 and a one year old sub-receiver. Do I need these boards? >>> What would they do for me? An off-list reply is welcome since it appears >>> I’m the only one who doesn’t know what’s going on. Thanks. >>> >>> Jimmy, WA4ILO >>> >>> ______________________________________________________________ >>> 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] > > ______________________________________________________________ > 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]
