Re: TCXO - 0.5PPM
Posted by
ab2tc on
Dec 28, 2010; 7:35pm
URL: http://elecraft.85.s1.nabble.com/TCXO-0-5PPM-tp5872529p5872737.html
Hi,
Using method 2 you should easily be able to get it within a couple of Hz by beating it against the CW spotting tone. The instructions in the manual are quite detailed (make sure you scroll over to the bulleted list). The wow-wow-wow warble you hear near zero beat is very easy to recognize provided you have the audio levels of the carrier tone and the spotting tone reasonably well equalized. If you use WWV make sure you zero beat it against the carrier and not one of the many tones they play. To be sure, listen through the full minute cycle; the carrier never disappears; the tones will. I check mine regularly - currently I am off by 2.5-3Hz on 20MHz - not enough for me to worry about (I just have the standard reference osc).
AB2TC - Knut
jim.w0em wrote
Hi Folks,
Been kicking around putting the 0.5PPM TCXO in my K3. After doing some reading a question or two arises. The instructions sheet(s) for the TCXO mentions using method 1,2 or 3 in the K3 manual to set frequency. The K3 manual does not have a method 3 as I can find. I've checked the reflector archive and found there is a data input feature in the K3 utility for inputting data received with the TCXO. I think this equals method 3. Someone make a note to change instructions/manuals if needed.
My question is do I need to do a method 1 or 2 before doing the data input? Method 1 is to use a freq counter. My freq counter is only about +/- 10 Htz depending on variables. Method 2 is zero beat. By ear the best I can get is about +/- 25 Htz. How close do I need to get with method 1 or 2 (if needed) before inputting the data?
Second question, will the 0.5PPM TCXO eliminate the hysteresis I see during RTTY? Depending on whether I tune to a signal from low to high or high to low I can see 10+ Htz difference in the signals frequency. Or, are other factors at work?
Constructive thoughts appreciated.
Happy New Year. 73
Jim, W0EM
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