Posted by
Nick Waterman on
Apr 25, 2006; 7:40am
URL: http://elecraft.85.s1.nabble.com/Need-help-for-sick-K1-tp389102p389116.html
Darrell Bellerive wrote:
> Please expand on this. I have never used a PSK application, but how would it
> detect the subcarrier is exactly at 100 Hz? I suspect the software is using
> the soundcard clock as a reference and that wouldn't necessarily be very
> accurate.
... 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?
> Seems that the K2 can be set very exactly using Wayne's method
> (
http://www.elecraft.com/Apps/K2%20C22%20Adjust%20App%20Note.pdf) but it
> requires properly zero beating WWV.
It'll still be only within about 30Hz, won't it?
> Wayne suggests just listening for zero beat, one should be able to get within
> about 15 Hz.
... which I'd have thought is well within the soundcard clock accuracy too.
> What tricks have others on the list found to tune WWV to within 1 Hz or less
> without expensive professionally calibrated test equipment?
I think you'll find day-to-day temperature variation, and
capacitative/inductive effects of nearby objects probably cause more
variation than that :-)
--
"Nosey" Nick Waterman, G7RZQ, K2 #5209.
use Std::Disclaimer;
[hidden email]
Confucius say: Man who fight with wife all day, get no piece at night
_______________________________________________
Elecraft mailing list
Post to:
[hidden email]
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.htmElecraft web page:
http://www.elecraft.com