Wayne, etal: I'm asking for someone else that has the K144XV (I don't).
With the addition of the K3EXREF and K144RFLK, and assuming you have the TCXO-3, what is the expected freq. stability expected? The K3EXREF is published at 0.05ppm. At 144-MHz, 0.05ppm would be 1.44x5 = 7.2 Hz. That is equivalent to the +6-Hz error of my new DEMI 144-28 transverter using a 116-MHz xtal oscillator. I see drift up to 11-Hz after one-minute key down at 50w. The K144XV would have the stability of the TCXO-3 in transmit (0.5ppm) which probably will drift only a few Hz at worst (based on my experience with the K3EXREF+TCXO-3 on 50-MHz where transmit drift was not more than 3-4 Hz total error). The TCXO-3 plus K144RFLK without the K3EXREF would have 0.5ppm or up to 70-Hz at 144-MHz (by my calculation). From that, I would encourage anyone that is planning to run digital modes like WSJT on 2m to install the K3EXREF with the K144RFLK. You want to maintain <25Hz drift on these modes. We often run the WSJT sw with only a 25-Hz decoding window so if you signal drifts outside that it will affect detection. To be fair I see many 2m eme signals that drift up to 50 Hz in one minute transmission. I just open the decoding window to 50 or 100Hz for them. Note: WSPR is the most demanding of the digital modes on freq. stability. 73, Ed - KL7UW, WD2XSH/45 ====================================== BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-1.4kw, 432-100w, 1296-testing*, 3400-winter? DUBUS Magazine USA Rep [email protected] ====================================== ______________________________________________________________ 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
