Is it possible the ribbon cable is as long as it is because it will need to eventually be routed around something else to be added later?
Art - N4PJ On Tue, May 29, 2012 at 2:10 AM, Bob Lanning <[email protected]>wrote: > In response to my message May 23, 2012; 3:27pm on the Elecraft P3 > reflector Roger White W5RDW in Murphy, Texas responded off-list. He had > the same problem I described. It was not coming from the K3 but from > inside the P3. We both noted it started after installing the SVGA. > > During our investigation we boy found: > > 1 - the signal is about 5kHz wide > 2 - it moves either up or down in frequency ever so slowly > 3 - moving the VFO does not change the position of the signal - internal > to P3? > 4 - reach back and approach the IF signal coax between the K3 & P3 > causes it to temporarily go away > 5 - sometimes touching the P3 cabinet caused it to disappear > 6 - changed out the coax but it still happens > > When the signal crosses the VFO frequency no sound is heard - only the > signal being listened to. But reaching back in the proximity of the > linking coax causes it to go away. Turning PC and other gear off has no > effect. > > Roger and I spent sometime isolating the source. We found a signal was > coupling into the IF cable inside the P3 from the ribbon cable. As you > can see from the SVGA instruction manual the ribbon cable is so long > that if not dressed it goes across the P3 and pushes up against the IF > coax in the unit. > > When the ribbon cable is dressed by folding it tightly keeping it well > away from the IF coax the wondering signal no longer appears. > > If you are having this anomaly Roger and I recommend making the change > to the ribbon cable as shown in the two pictures below. It would be > nice to have a shorter ribbon cable. > > 73, > > Bob - W6OPO > Roger - W5RDW > > ______________________________________________________________ > 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 > ______________________________________________________________ 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
