When I first got my P3 I used the included cable. I had some spikes on the screen that didn't make sense. As I have worked at minimizing ingress of junk into the cables in my shack I replaced the included cable and made up a new one with 100% foil shielded coax with new BNC connectors. That took care of the junk on the screen.
Before I left home this week for KP2 I hooked up a coax from the P3 to the LP-Pan to run CW Skimmer. When I hook up the cable I see one spike on the P3. I have not had time to check it out. Will do that when I get home. Ferrite on the coax jumper didn't help. 73, N2TK/NP2, Tony -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ron D'Eau Claire Sent: Thursday, February 28, 2013 11:45 AM To: 'Bill Clarke'; [email protected] Subject: Re: [Elecraft] P3 - spikes that never move A signal near the I.F. that is picked up by the P3 or P3 cable will not move as you tune. Other signals appear to move only because their frequency relative to the I.F. center frequency changes as you change the frequency of the K3's VFO. I'm not saying that the artifacts cannot be internal to the P3. Only that a fixed frequency signal near the K3's I.F. will remain in a fixed position on the P3 display as you tune the K3, whether it is internal or external to the P3. 73 Ron AC7AC -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Bill Clarke Sent: Thursday, February 28, 2013 4:13 AM To: [email protected] Subject: Re: [Elecraft] P3 - spikes that never move This morning I removed the entire shack from AC and left only the K3/P3 on battery and the antennas disconnected. No change on the screen. Bunch of work for nothing and was exactly what I expected. Of note: The ghosts vanish when the band is active - covered by the ambient background noise level. During the day, when the band is "dead," this is not the case and the spikes can be seen. Remember, I can not tune to them as they remain in a static location on the scope. Signals move through them as you tune. Having used other forms of band-scopes over the years (including the great SM-220) that only displayed what was actually RF on a band, I am convinced this is something internally generated within the P3. If it was outside of the P3, it would tune (move when the VFO is moved). Perhaps the P3 is overkill and does, or is capable of, way more than what a simple band-scope really needs to do. Such is the day and age of microprocessors - simplicity has been left in the dust of bells and whistles. Rather than continue to worry about this, I am just going to accept it as an anomaly of the P3. It really has no effect other than appearing as signals that are not really there. Once you know what they are, you won't bother trying to tune to them. Does this make it right for the $$$? No, of course not, but it is the easy way out for an old guy that only rag chews on 75 and 40. Thanks for all the comments, Bill W2BLC ______________________________________________________________ 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 ______________________________________________________________ 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
