Speaking of band edges.... During the recent ARRL DX SSB contest, there was a station operating on 7127. Because of the lower SB extending to 7124 (assuming 3k bandwidth) he was operating out of the US phone band. He was a European but he was working simplex. I bet there was an OO sitting there sending notices to every US contact he made.
If you KNOW your frequency to 1 Hz, you can legally operate with your dial on 14149.9 and still be in the band. Likewise 7300.1. Also RTTY on 3601, etc. etc. A super accurate transmitter has it's advantages :-) Jerry - K0TV ----- Original Message ----- From: "Matt Zilmer" <mzil...@verizon.net> To: "Rick Stealey" <rstea...@hotmail.com> Cc: <elecraft@mailman.qth.net> Sent: Sunday, March 20, 2011 6:48 PM Subject: Re: [Elecraft] Installed K3EXREF > 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 ______________________________________________________________ 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
