Elecraft › [K3]

Ref Osc calibration question

Classic

List

Threaded

3 messages Options

w0ih

Ref Osc calibration question

I noticed that when I went to AM-S (AM Sync, AutoTracking), that the frequency showed:
10.000.010

So, I figure that the Reference Oscillator was off a bit. So I tweeked the oscillator slightly until the frequency showed 10.000.000 when I when out of the Config Menu.

Is there anything wrong with this logic?

I couldn't seem to hear beat oscillator when I get close to the 10 Mhz signal to adjust it by the manual.

Mike

N5GE

Re: Ref Osc calibration question

When you put the rig in AM Sync the rig will follow any changes in the received
signal to "Sync" with it. You will also notice that you are actually on SSB in
this mode.

What you saw was normal. I hope you remember what the original setting of the
Ref Osc was.

The manual has a good description of how AM Sync works.

73,

Tom Childers
Radio Amateur N5GE
Licensed since 1976
QCWA Life Member 35102
ARRL Life Member
Retired Professional
C# Software developer
http://www.n5ge.net

On Sun, 30 Jan 2011 14:12:42 -0800 (PST), w0ih <[hidden email]> wrote:

>
>I noticed that when I went to AM-S (AM Sync, AutoTracking), that the
>frequency showed:
> 10.000.010
>
>So, I figure that the Reference Oscillator was off a bit. So I tweeked the
>oscillator slightly until the frequency showed 10.000.000 when I when out of
>the Config Menu.
>
>Is there anything wrong with this logic?
>
> I couldn't seem to hear beat oscillator when I get close to the 10 Mhz
>signal to adjust it by the manual.
>
>Mike

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

Amateur Radio Operator N5GE

Don Wilhelm-4

Re: Ref Osc calibration question

In reply to this post by w0ih

Mike,

The thing that is wrong with that logic is that AM-S has an "AFC"
associated with it (capture range). So the frequency that AM-S can
capture will not necessarily show the actual carrier frequency.

If you cannot determine the beat frequency, I would suggest you first
use an audio spectrum analyzer like Spectrogram (download at
www.n0ss.net) or SpectrumLab in SSB mode to observe the tones
transmitted by WWV - 500 Hz and 600 Hz on alternate minutes except for
silent minutes and one minute of each hour when 440 Hz is transmitted
(the one second tone at each minute is 1000 Hz).

Once you get the frequency close to correct using the above method, then
try the "beat note" method in the manual - you should be close enough to
hear the beat in CW mode - just adjust until the "wow-wow" tone is as
slow as you can get it.

73,
Don W3FPR

On 1/30/2011 5:12 PM, w0ih wrote:

> I noticed that when I went to AM-S (AM Sync, AutoTracking), that the
> frequency showed:
> 10.000.010
>
> So, I figure that the Reference Oscillator was off a bit. So I tweeked the
> oscillator slightly until the frequency showed 10.000.000 when I when out of
> the Config Menu.
>
> Is there anything wrong with this logic?
>
> I couldn't seem to hear beat oscillator when I get close to the 10 Mhz
> signal to adjust it by the manual.
>
> Mike