Re: Why is my K3 off frequency?


Bob Novas
 

Well, in the spirit of making mistakes and asking questions is a great way to learn, I've got my own stupid question. With manipulation of the fine/coarse control, the frequency readout of a K3s can show a frequency with 1, 2 or 3 decimal precision - e.g., xxxx.0, xxxx.00 and xxxx.000. If you have the readout set for coarse, what frequency are you actually on when the readout reads xxxx.0? I can imagine it might be xxxx.000, but I'm pretty sure from experiment that it's not. It's whatever "offset" you had from xxxx.000 when you engaged coarse. In other words, if the fine frequency was xxxx.099 and you engaged coarse, your readout would be xxxx.0 but your frequency would be xxxx.099.

Does anyone know the answer to this?

Thanks,
Bob - W3DK

-----Original Message-----
From: Elecraft-K3@groups.io <Elecraft-K3@groups.io> On Behalf Of Dave Cole
Sent: Tuesday, March 23, 2021 9:01 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] Why is my K3 off frequency?

I choose to treat this like a real ask for help. If I am right, the op gets an answer, if I am wrong, then it might help someone else... If I am snarky, then no one gets help...

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 3/23/21 5:55 AM, Bob Novas via groups.io wrote:
Lessee what's happening. Oh, it's April 1 is it? Hmmm....

-----Original Message-----
From: Elecraft-K3@groups.io <Elecraft-K3@groups.io> On Behalf Of Dave
Cole
Sent: Tuesday, March 23, 2021 8:49 AM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] Why is my K3 off frequency?

Hi Charles,

Having a NCS, (Net Control Station), worry about stations being 12 Hz off, and complaining they have to use RIT is, shall we say, at best anal retentive, having others join in, and agree, probably means you misunderstood what the NCS indicated as the frequency amount you were off, or you have a net full of folks that worry too much.

Could it be you misunderstood the Net Control, and he indicated 120 Hz, or 1.2 KHz low?

A good way to perform a rough check on this is to do the following:

0. Hit CLR below RIT/XIT.
1. Turn off RIT/XIT and hit CLR below both.
2. Tune to 5.000000 MHz.
3. Wait to hear the idle tone WWV puts out.
4. Go between USB and LSB
5. If they sound the same you are very close to being on frequency.
6. Goto 2 above, but change to 10.000000 MHz.
7. Goto 2 above, but change to 15.000000 MHz.
8. Goto 2 above, but change to 20.000000 MHz.

In all cases you should hear very little change. If you hear no change offset one of the frequencies above to: 5.000012, and switch between both sidebands, that will show you what it sounds like when you are off frequency.

If you discover your rig is off frequency, there is a procedure for fixing this in one of the Elecraft K3 manuals.

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 3/23/21 3:20 AM, Charles N2SO wrote:
Hi,
Last night my local ham club scheduled their first ever 6Meter Net
and Roundtable for 50.135Mz. I operate USB very rarely, preferring CW
for all of my Contesting and DX work. Last night the net control
station advised me that I was 12Hz too high and that he had to use
his RIT control to tune to me. When I turned on my XIT and
transmitted down 12Hz I was right on his frequency. This was
confirmed by other callers as well. I have also heard this problem
mentioned in the past when checking into occasional 75M nets. Is
there an adjustment that I can or should make aside from using my XIT?
Thanks for any assistance you can provide.

73, Charles N2SO










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