Is the noise floor on the P3 stuck at -140 dBm or so all the time, no matter what? I experienced a similar problem after 2 weeks of use, and replacement of the P3 RF board was required. Apparently, I was informed, another cause can be handling damage to transformers T100 or T101 on the P3 Front Panel board, so you might take a look at them. I sure wish the P3 schematic was available at the time, it would have made troubleshooting a little easier (it's still not published AFAICS). As usual, Elecraft support was prompt and efficient, I'd contact them if there's no change.
Bob NW8L On Sat, Sep 11, 2010 at 4:34 PM, Sanger, Joseph <joseph.san...@nyumc.org> wrote: > Just assembled P3 a few days ago. Having a problem that I can't seem to > solve. > > Background: Haven't done K3 OUT mod yet (SN 113 ---- fairly old) ... really > am apprehensive about opening up K3 again ... but I know I'm just being > neurotic ... will face any weekend now). > > The P3 was pretty much performing as expected ... given that I haven't done > the above mode yet, and I live in manhattan with a mediocre hamstick hung > outside my window .. I could generally see strongest stations above a lot of > noise on P3. That was good. > > But over past few days, it seems that the sensitivity of the device was > diminishing .. started to have trouble seeing the few stations that I could > actually hear above the noise on my K3 ... and then today, it now appears > that the P3 is basically deaf to the K3 ... I see some low ampitude noise, > which doesn't vary in appearance with or without the coax cable to the IF OUT > of the K3 plugged in. I am listening to a fairly strong Italian CW station > now on 20 meters now, sticking his head above the omnipresent S5-6 noise ... > armchair copy, if you will, but all I see is noise at the bottom of the P3 > screen. The center frequency tracks my K3 nicely ... but no matter how I > adjust the REF, SCALE and SPAN, all I see is noise. > > Any thoughts would be welcome. Yes, I will dive in and do the IF OUT mod, > but am trying to understand the curious behavior, and to see if it sounds > familiar to anyone. > > Thanks in advance > > -- WB2SSB > > Joseph J. Sanger, M.D. > Associate Professor of Radiology > Director, Radiology Informatics ______________________________________________________________ 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
