Most Hams do not have the test equipment to measure phase noise. The big issue is 49.380 MHz is an unusual frequency and probably a custom order frequency standard. The knockoff makers generally don't spend for a custom part. They take a standard TCXO and generate that frequency using a crappy PLL based synthesizer with high phase noise and lots of spurs. I have not tested this particular type (Elecraft replacement) though. Others I tested were awful. The result would be more interference between radios that are physically close to each other and on the same band. such as contest and Dxpedition stations. The low phase noise is a big reason that Elecrafts are prized for such applications. Both RX and TX are affected.
I make replacement TCXOs for Kenwood TS-590s. They also use an unusual frequency but I was able to get a TCXO chip supplier to provide me a custom frequency chip that I had to buy in some quantity. That allowed me to produce a quality product, although things are upside down now with the component shortages in the industry. If huge companies like auto makers and a company with a decent volume like Elecraft have part procurement problems, you can imagine how bad it is for a really small fry like myself. Has Elecraft stated why they are no longer available? I have not checked with my supplier recently, but I expect there would be no interest in low volume runs when demand can't be met for their high volume parts. 73, Mark W7MLG On Mon, May 10, 2021 at 5:58 PM Hank via Elecraft <elecraft@mailman.qth.net> wrote: > I was thinking the same thing. Several posters here said that the phase > noise created was worse than the Elecraft part. I do not understand enough > about the process to understand how that works. I keep hoping someone will > buy one and try it out - and test the phase noise! > > Hank > K4HYJ > > > ----- Original Message ----- > From: RVZ via Elecraft (elecraft@mailman.qth.net) > Date: 05/10/21 19:27 > To: elecraft@mailman.qth.net > Subject: [Elecraft] K3: KTCXO-3 Compatible Elecraft K3 TCXO 1 PPM High > Stability Ref. Osc. Compatible > > I'm interested in adding a KTCXO-3 to my K3S. Since Elecraft no longer > sells them I'm wondering if anyone has purchased one of the Chinese > versions being sold on eBay and if so how it worked? > https://www.ebay.com/itm/182814802678 > > Tnx & 73, Dick- K9OM > ______________________________________________________________ > 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 > Message delivered to h...@optilink.us > > ______________________________________________________________ > 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 > Message delivered to marklgoldb...@gmail.com ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
