Posted by
David Woolley (E.L) on
Oct 15, 2007; 8:13am
URL: http://elecraft.85.s1.nabble.com/K2-Is-TX-frequency-susceptible-to-RF-on-chassis-tp454716p454718.html
Don Wilhelm wrote:
>
> I do not believe that RF on the chassis could easily cause a frequency
I hope that's the case, although UHF RF can cause a small shift, and I
assume the MHz birdies are less affected than the varactor controlled
oscillators.
> I suggest that you first take a good look at your SSB FL1 filter for
> both LSB and USB. If you have the curently normal SSB filter width of
I'll have another look at that.
> tracking. If you have an extremely 'bassy' voice, then you may want to
Low on USB would suggest the opposite.
> If you are using the K2 frequency indication to 'net' on a given
> frequency, your dial calibration may be off a bit. To get it right,
As the frequency appeared to be round, I may have been influenced by
that as well as the correct sound.
> refer to the K2 Dial Calibration article on my website
>
http://w3fpr.qrpradio.com for techniques to accurately set the 4 MHz
> reference oscillator and the following steps to achieve good dial
> calibration.
Unfortunately, the sun doesn't seem to favour picking up WWV. The
original calibration was against the MHz birdies on an FRG7, which was,
I think, calibrated against WWV in the past. However I just tried on
some 41m broadcast stations, and it looks like the calibration might be
30 to 40 Hz high on that band, which probably equates to 50 to 70 Hz, in
the same sense, on 10m, so I may try a calibration against those
broadcast stations. (Does anyone know a relatively accurate broadcast
station, receivable in a noisy location in the UK, and near the high end
of the VFO range?)
>
--
David Woolley
Emails are not formal business letters, whatever businesses may want.
RFC1855 says there should be an address here, but, in a world of spam,
that is no longer good advice, as archive address hiding may not work.
_______________________________________________
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