Auto-spot, tuning aids, and the arcane history of CW pitch-matching

[Don Wilhelm]

Dave,

Put the external reference oscillator input option on your K3 and avoid
that situation with an external 10 MHz reference oscillator.

The K3 Reference Oscillator temperature steering is from the static
temperature offsets.  If you have equipment to do better than the Data
Sheet, you can determine your own values, but for those without that
equipment, the data sheet provides a good index for various temperatures.

73,
Don W3FPR

>
> Yes.  I'm a stickler for accuracy.  It always bothered me that the
> so-called 'temperature compensated' LO in the K3 was not actively being
> steered by temperature compensation (i.e. I could only put static
> temperature offsets into the rig memory from the data sheet that came
> with the oscillator). That was a 'feature' that was never released. At
> HF frequencies, it was only an annoyance, but using UHF transverters,
> the error compounds (I'm using a crystal oven in my UHF transverter, but
> the lack of one in the K3 caused drifting).
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[ab2tc]

Hi,

It doesn't "compound". A 10Hz drift at the antenna output of the K3, will be
reflected as a 10Hz drift at the output of any transverter, be it VHF, UHF
or microwave. At the higher frequencies even a transverter with an OCXO its
drift would probably dominate.

AB2TC - Knut


Wes Stewart-2 wrote

> You should be subscribed to Timenuts.
>
> But clearly one of us is confused. If you're using an OCXO in your
> transverter
> and up converting the K3, how does K3 drift/inaccuracy "compound" at UHF?
>
> Can you read that watch to 50 ms?  What are you going to do when WWVB goes
> QRT?
>
> Wes  N7WS
>
> On 1/23/2019 12:26 PM, Dave New, N8SBE wrote:
>>
>> Wes,
>>
>> Yes.  I'm a stickler for accuracy.  It always bothered me that the
> <snip>

--
Sent from: http://elecraft.365791.n2.nabble.com/
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[Bob McGraw - K4TAX]

I've never had a drift issue with any of my modern transceivers on 28MHz as the IF.  Now the TCXO drift in the transverters is real issue.

Bob, K4TAX


Sent from my iPhone

> On Jan 23, 2019, at 7:08 PM, ab2tc <[hidden email]> wrote:
>
> Hi,
>
> It doesn't "compound". A 10Hz drift at the antenna output of the K3, will be
> reflected as a 10Hz drift at the output of any transverter, be it VHF, UHF
> or microwave. At the higher frequencies even a transverter with an OCXO its
> drift would probably dominate.
>
> AB2TC - Knut
>
>
> Wes Stewart-2 wrote
>> You should be subscribed to Timenuts.
>>
>> But clearly one of us is confused. If you're using an OCXO in your
>> transverter
>> and up converting the K3, how does K3 drift/inaccuracy "compound" at UHF?
>>
>> Can you read that watch to 50 ms?  What are you going to do when WWVB goes
>> QRT?
>>
>> Wes  N7WS
>>
>>> On 1/23/2019 12:26 PM, Dave New, N8SBE wrote:
>>>
>>> Wes,
>>>
>>> Yes.  I'm a stickler for accuracy.  It always bothered me that the
>> <snip>
>
>
>
>
>
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
> ______________________________________________________________
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>
> This list hosted by: http://www.qsl.net
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[Wes Stewart-2]

Of course I know that.  Mine was a rhetorical question.

On 1/23/2019 6:08 PM, ab2tc wrote:

> Hi,
>
> It doesn't "compound". A 10Hz drift at the antenna output of the K3, will be
> reflected as a 10Hz drift at the output of any transverter, be it VHF, UHF
> or microwave. At the higher frequencies even a transverter with an OCXO its
> drift would probably dominate.
>
> AB2TC - Knut
>
>
> Wes Stewart-2 wrote
>> You should be subscribed to Timenuts.
>>
>> But clearly one of us is confused. If you're using an OCXO in your
>> transverter
>> and up converting the K3, how does K3 drift/inaccuracy "compound" at UHF?
>>
>> Can you read that watch to 50 ms?  What are you going to do when WWVB goes
>> QRT?
>>
>> Wes  N7WS
>>
>> On 1/23/2019 12:26 PM, Dave New, N8SBE wrote:
>>> Wes,
>>>
>>> Yes.  I'm a stickler for accuracy.  It always bothered me that the
>> <snip>
>
>
>
>
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
> ______________________________________________________________
> 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
> Message delivered to [hidden email]

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[Dave New, N8SBE]

Don, Ed, Wes, et al,

Thanks, guys, I misspoke.  I was thinking of the old multiplicative
CW-only designs that have been floating around, but of course, the
Elecraft ones don't do that.  My bad.

Yes, it would be nice to sync the Elecraft transverters to a 10 MHz
signal.

Which ones do you guys have that have a PLL-locked 10 MHz ref in?

Don, I do have the TCXO-3 and also the XREF in my K3S.  It works very
nice with my Leo Bodnar GPS 10 MHz frequency source.

73,

-- Dave, N8SBE



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