Thanks Nick and Don for the explanation of the accuracy of the soundcards and K2 sidetone.
On April 24, 2006 11:40 pm, Nick Waterman wrote: > ... but it'll be within a few percent, surely, and that means you'll be > within a few hertz of 100Hz? The K2 tuning steps are likely to be a lot > bigger than that? Theoretically if one could tune WWV to .001 Hz accuracy and have the manual dexterity to set C22 as accurately, then at the frequency of 10,000,000.00 Hz one would be within +/- .002 Hz. Now because the K2 does not tune in precise 10 hz steps, 10,000,010 Hz would only be as accurate as Wayne's algorithms and PLL calibration allow. This is all assuming that there is absolutely no change in frequency caused by temperature or any other means. Then again, WWV is only accurate as received to +/- 1Hz (1 part in 10 million). > > I think you'll find day-to-day temperature variation, and > capacitative/inductive effects of nearby objects probably cause more > variation than that :-) Yes, that is the reality of it. Amazing how digital readout has changed the way we look at our frequency of operation. Wonder what the typical accuracy of the digital readouts of the commercial (Kenwood, Icom, Yaesu, Ten-Tec, etc.) is? My first receiver was a Hallicrafters SX-140 and that was followed by a Heathkit SB-101. One was dependant on the crystal calibrators for frequency accuracy. The Hallicrafters used a 3.5 Mhz crystal to set the lower band edges. There was no trimer to adjust the 3.5 MHz crystal. So at 3.5 MHz one was as close to 3.5 MHz as the crystal oscillator tolerance. At the 4.0 MHz end, it was dependant on the VFO and alignment. No spec was listed in the manual for the frequency accuracy. Wonder what it was at 4.0 MHz, or at 54.0 MHz. 10 Hz, 100 Hz, no way. 10 Khz more likely. Darrell -- Darrell Bellerive Amateur Radio Stations VA7TO and VE7CLA Grand Forks, British Columbia, Canada _______________________________________________ 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
