That depends on how the external reference is used. The K3 uses a counter lock scheme that does NOT change the phase noise of the internal oscillator. This is real obvious if you measure the 'locked' oscillator. When locked it still drifts around +/- 0.5 Hz. This is just marginally good enough for the ARRL Frequency Measuring Tests.
Steve, K6UM On Wed, Jun 6, 2018 at 12:55 PM, John Harper <[email protected]> wrote: > In this podcast Eric gives a very interesting talk on various factors that > influence receiver performance. The entire audio program is well worth > listening to: > > https://www.hamradioworkbench.com/podcast/understanding-hf- > receiver-specifications > > At some point a bit over halfway in, Eric mentions that an external GPS > reference could actually contribute to phase noise, so you've gained freq > stability/accuracy for increased noise. > > No free lunch! > > John AE5X > https://ae5x.blogspot.com > ______________________________________________________________ > 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]
