If fact, the circuitry for that very nice "homebrew" solution is for VOX. If you have a modern radio like the K2/KX3/K3, it most probably has a VOX circuit already built in, so the "melting solder" part reduces to simply putting the right connectors on the end of some cables.
73, Matt VK2RQ > On 1 Jul 2014, at 9:04 am, "Joe Subich, W4TV" <li...@subich.com> wrote: > > > > Has anyone heard of this happening with a SignalLink sound card > > before? > > Yes. Did your friend change computers, connect Signalink to a > different port, add (or remove) an externally powered hub? > > Signalink has documented design issues - it lacks the V/2 regulator > for the codec as recommended by the chip vendor, has a severe lack > of bypasses on the 5V bus, insufficient filtering on the USB power > (which becomes the 5V bus) and no regulation. If the computer's USB > power becomes noisy/unstable, that noise is imposed directly on the > audio output of the codec *and* is further modulated on the audio > via bias to the op-amp audio stages. > > See documentation of the defects (and modifications to fix some of > the shortcomings - including schematics) here: > http://www.frenning.dk/OZ1PIF_HOMEPAGE/SignaLinkUSB-mods.html > > If one wants a higher performance interface at a lower cost that > will do everything that a Signalink will do and is willing to melt > a little solder see: http://www.g4ilo.com/usblink.html > > 73, > > ... Joe, W4TV > > >> On 2014-06-30 3:45 PM, David Cole wrote: >> Hi, >> I have a friend who lives about 1/2 to 3/4 of a mile from me. He is >> running a 706 MK2G, at around 10 watts. >> >> In the past, while using a Pro III, when he came on, I was able to copy >> and see signals using JT65, and work stations right next to him. >> >> After getting the K3, I believe I was able to do this as well, or >> better... Suddenly his signal is sprayed across the entire audio >> spectrum to the point, I can't even tell what frequency he is on... >> >> I get a solid white block using WSJTx. He and I enlisted a third >> friend, to insure it was not just me that is seeing him as very wide. >> The third friend lives about 4 to 5 miles from both of us, and is line >> of site to my friend with teh 706 MK2G. When the 706 MK2G lets loose, >> I see the spray, but my friend does not... He sees a nice tight signal. >> It looks and sounds like phase noise... However... >> >> If he just does a Key down for CW at 50 watts, I can copy stations right >> next to him... It is as if his sound card, (Signal Link with internal >> sound card), is adding a low level hiss to the audio, I see it due to >> proximity, and my friend does not again, because he is much further >> away... >> >> This has started suddenly, and the owner of the 706 can not pin a change >> to it... We swapped in a different 706MK2G, and the same problem still >> happens... >> >> Has anyone heard of this happening with a SignalLink sound card before? > ______________________________________________________________ > 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 > Message delivered to matt.vk...@gmail.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 Message delivered to arch...@mail-archive.com
