Hi Joe, Thank you for that, I have wondered what it was for years! -- Support better RFI practices, please sign this petition: at Whitehouse.gov
http://wh.gov/lpz5Y On Sat, 2014-04-05 at 13:32 -0400, Joe Subich, W4TV wrote: > > I have an inrad roofing filter installed to the PRO III. Does this > > still sound like Phase Noise to you? > > Yes, phase noise in your 756ProIII. The phenomena is called reciprocal > mixing - the phase noise from your own synthesizer appears on any strong > signal within the passband. > > Icom rigs are known for terrible phase noise - I have a neighbor about > 1/2 mile away whose transmitted phase noise and spurs from an Icom rig > and amp wipe out a substantial portion of any band he's on. > > 73, > > ... Joe, W4TV > > > On 4/5/2014 12:51 PM, David Cole wrote: > > Hi Dave (K6LL), > > Thanks for that thought, but I am pretty sure it is not their rigs... > > > > Here is my reasoning for why I think that: > > > > One rig is a K3, and an AL-1500, about 1/2 mile from me, and line of > > sight. One of the the others is a 756 PRO III, and I don't know what > > amp, about a half mile from me, while the third is an older Collins rig, > > with an older Henry amp, about 100 yards from me. > > > > All three rigs, and my mobile rig in the driveway, cause exactly the > > same effect when they are transmitting, the band scope, (set to > > something like 200 KC wide), shows perfectly straight increase across > > the entire 200 KC's of scope, along the bottom, as a raised noise floor > > would. It looks like phase noise, but I would expect that to roll off, > > and not be as flat as this is. I also live close to an AM station, > > 100KW, and about a mile and a half away, and I see almost the same > > thing, as I approach the station frequency. I can see the entire noise > > floor raise as I get closer to the station. > > > > I have an inrad roofing filter installed to the PRO III. Does this > > still sound like Phase Noise to you? > > > ______________________________________________________________ > 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] ______________________________________________________________ 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]
