Adam, I assume you are referring to drift of the 4 MHz master oscillator and not to a drift in the PLL reference oscillator.
Drift in the 4 MHz reference is of little to no consequence in normal operation of the K2. It is only important at the time CAL PLL and CAL FIL are performed. The K2 does not use the 4 MHz reference to count the frequency on a real-time basis. The values obtained during the CAL PLL and CAL FIL process are retained in EEPROM and those values are used for control and display of the K2 frequency, so the 4 MHz oscillator may drift many kHz and all will still be well with the K2. The 4 MHz oscillator does serve as the clock signal for the microprocessor, but it's accuracy is not important for that use. If you wish to achieve good dial calibration on the K2, warm the K2 up to operating temperature before calibrating the 4 MHz reference oscillator and running CAL PLL and CAL FIL. Instructions for calibrating the K2 dial to an accuracy of 10 to 20 Hz can be found on my website http://w3fpr.qrpradio.com . 73, Don W3FPR > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of > [EMAIL PROTECTED] > Sent: Sunday, December 24, 2006 8:48 AM > To: [email protected] > Subject: [Elecraft] K2 frequencyh stability > > > Hello all, > > I notice that on K2 #03547 rev B (with KPA100, KDSP2, KSB2, > K160RX and thermistor installed at time of build) the master > frequency drifts as a function of temperature. From an > ambient temp of 65F to max rig temp when the KPA100 fan > kicks in the receiver may drift by 800 Hz. The range is > usually more narrow given the typical temp shift experienced. > > My solution has been to calibrate C22 against WWV such that > as the rig warms up, the master frequency set by C22 drifts > towards zero-beat with WWV. > > My question is this: how much drift is typical? > > Adam, N1KO > _______________________________________________ > Elecraft mailing list > Post to: [email protected] > 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 > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.432 / Virus Database: 268.15.26/597 - Release Date: > 12/21/2006 6:45 PM > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.15.26/597 - Release Date: 12/21/2006 6:45 PM _______________________________________________ Elecraft mailing list Post to: [email protected] 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
