>"If you want a good quality 10 MHz GPSDO, I recommend the one made by Leo Bodnar M0XER. It was reviewed in QST, June 2016."
Unless the K3S architecture is different than the K3, then frequency, rather than phase-locking is used from the external frequency source. Phase noise performance of the GPS-DO doesn't impact performance of the K3 receiver. However, if planning on distributing the GPS-DO to other devices, I think it's worthwhile to note that the higher-priced version of the Bodnar is still > 30 dB worse at a 100 Hz Fc offset than a common Trimble Thunderbolt with the Trimble-branded OCXO (not Piezo) when powered from a low-noise, lab-grade supply. For example, typical Trimble PN at 100 Hz is -160 dBc. The upper-grade Bodnar unit is about -125 dBc. Compared to what's available on the new and used markets, I agree with G4DYA that the Bodnar's performance is probably characterized as good, but not excellent. Again, for K3 users it isn't an issue, but if the device is driving other test gear or other transceivers, that 30 dB difference may mean a lot. The Thunderbolts were once plentiful on eBay for USD $99. Scarcity has driven that up but with persistence, a watchful eye can still spot one at a reasonable price. I ended up installing a Trimble unit and Lambda linear supply into a customized enclosure. It drives a TAPR distribution amp and that supplies a precision 10 MHz refence to multiple transceivers and test equipment. http://tinyurl.com/j7r36w5 Paul, W9AC --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ______________________________________________________________ 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
