The K3EXREF is in field test now, as far as I know. It might be a little while before Elecraft puts it up for sale.
"Extreme accuracy" probably has two psychological and one scientific source: - The need to put the K3 dead-on frequency is reassuring to folks that aren't sure it stays that way mostly as-is with the TCXO. - The desire to be a frequency authority, and be able to help others when they're off-freq. Hams with older rigs sometimes end up shifted off freq. On HF, I hear this a lot. - Knowing exactly what frequency you're on helps with band-edge issues, for example between the Extra-only CW sub-bands and the general CW sub-band. With a 1 Hz readout, this is seldom a problem, but it gets even better when the last digit also indicates the actual carrier freq. The K3 with just the stock TCXO holds the reference at somewhere below 1 PPM anyway. This is probably accurate enough for almost everyone, but some want near-perfect accuracy. GPS time has an uncertainty of around 0.3 nS, which is pretty low compared to 1PPM. No TCXO can beat that, but maybe an OCXO can? 73, matt W6NIA On Sun, 20 Mar 2011 14:45:59 +0000, you wrote: > > >Excellent posting by W9AC, a great reference, to be saved. >Now I wonder if it would be possible for someone to enlighten me as to >the need for such extreme accuracy? Is it because my K3 reads out to 1 Hz >but I can't really believe the absolute accuracy of that number unless I >get a K3EXREF? But if that is the case, my question would still remain, >wouldn't it? >Not that I need something else to put on my list ahead of my P3 and >sub receiver. >Rick K2XT > >______________________________________________________________ >Elecraft mailing list >Home: http://mailman.qth.net/mailman/listinfo/elecraft >Help: http://mailman.qth.net/mmfaq.htm >Post: mailto:Elecraft@mailman.qth.net > >This list hosted by: http://www.qsl.net >Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
