Joe, Thank you so very much, yes he did change computers... :) Also, the additional information will help in solving this... I'll pass all of this on to him!
Joe, you are a bottomless pit of handy things to know, thank you again! -- Thanks and 73's, For equipment, and software setups and reviews see: www.nk7z.net for MixW support see; http://groups.yahoo.com/neo/groups/mixw/info for Dopplergram information see: http://groups.yahoo.com/neo/groups/dopplergram/info for MM-SSTV see: http://groups.yahoo.com/neo/groups/MM-SSTV/info On Mon, 2014-06-30 at 19:04 -0400, Joe Subich, W4TV 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:[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]
