It would help a lot when your neighbor is not transmitting or transmitting on a different band. Plus, it is courteous to transmit a cleaner signal.
wunder K6WRU CM87wj http://observer.wunderwood.org/ (my blog) On Jul 8, 2015, at 9:04 AM, Alan <[email protected]> wrote: > By the way, a corollary to this is that it doesn't help much to improve the > phase noise of your radio if your neighbor's radio is dirty. > > Alan N1AL > > On 07/08/2015 08:45 AM, Alan wrote: >> On 07/08/2015 06:02 AM, David Cole wrote: >>> >>> It occurs to me that the the the RX VFO phase noise would be less >>> influencing, (on phase noise sidebands), than the transmit VFO phase >>> noise... Is that correct? >>> >>> If so, then that would explain why the largest change occurred when >>> K7OLN got his new synthesizer, as opposed to me getting my new >>> synthesizer, as shown in the difference between photos 2 and 3. >>> >> >> I believe the TX and RX phase noise have an equal effect on the >> interference. >> >> Let's say the phase noise of the new synthesizer is 10 dB better than >> the old at a particular offset frequency. That is, 1/10 the power. >> >> If you replace one synthesizer (RX or TX) then the total phase noise is >> reduced by a factor (1 + 1/10) / (1 + 1) = 0.55 or -2.6 dB. >> >> If you replace both synthesizers, then the total phase noise is reduced >> by a factor (1/10 + 1/10) / (1 + 1) = -10 dB. >> >> I don't think it makes any difference which synthesizer is changed first. >> >> Alan N1AL >> ______________________________________________________________ >> 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] ______________________________________________________________ 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]
