Hi Someone pointed out that we all have different 49 MHz oscillators. I guess that many K3 owners have oscillators without input for the voltage control. This pin is indicated in the KREF3 shematic as pin 1 (VCTRL) of Z1. My KTCXO3-1 is manufactured by KS Electronics (part number 1099) and pin 1 (VCTRL) is not connected internally. It can not be used in a PLL. I had to replace mine with a VCXO. I guess that is why Elecraft has cancelled that project, they would have to swap oscillators.
*The design of the PLL is fairly simple and can be built on a small board plugging directly into J4. *One has to consider the resulting phase noise and spurs of the locked KREF3. *The Kref 3 must also fall back into a default mode when the extref is disconnected (portable use) or if the PLL unlocks. I wonder if the promised optional board foor the K144XV allowing lock of the 116/118 MHz XO to the KREF3 is also cancelled ? Jan -- View this message in context: http://elecraft.365791.n2.nabble.com/KREF3-External-Reference-card-tp5143036p5166771.html Sent from the [K3] mailing list archive at Nabble.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
