Re: [Elecraft] Re: K3 question--TCXO or another filter?
On Tue, Aug 5, 2008 at 1:44 AM, Dave G4AON [EMAIL PROTECTED] wrote: The difference between TCXOs is 4ppm not 4 Hz. The standard TCXO can be +/- 250 Hz at 50 MHz, the optional one can be +/- 50 Hz at 50 MHz or perhaps +/- 25 Hz once the firmware is changed to allow the supplied calibration table to be used. Using the optional 1ppm TCXO in my K3 results in a typical Thank you Dave (and others who corrected me in private), you are correct I did make a mistake, the 5ppm / 1ppm ( 5E-6 / 1E-6) is relative to the oscillator's frequency, 49.380 MHz, so the actual expected frequency error (tolerance / stability) is as Dave gave above. -Michael, VE3TIX ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] Re: K3 question--TCXO or another filter?
The difference between TCXOs is 4ppm not 4 Hz. The standard TCXO can be +/- 250 Hz at 50 MHz, the optional one can be +/- 50 Hz at 50 MHz or perhaps +/- 25 Hz once the firmware is changed to allow the supplied calibration table to be used. Using the optional 1ppm TCXO in my K3 results in a typical accuracy of within 20 Hz at 50 MHz, under normal shack temperatures. I run a home brew GPS derived standard for calibration purposes. The K3 is one of the few transceivers that can be adjusted for frequency without taking a cover off or needing a trim tool, it can be easily calibrated every hour, every day or whatever - if that's what floats your boat. Whether you need the higher accuracy is only something you and your wallet can decide. 73 Dave, G4AON K3/100 #80 - The average user won't notice the +/- 4Hz improvement ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
