This one doesn’t have offset adjustment, but may have trimmer for calibration.
Parts so small, haven’t located it yet.
Sent from my iPhone
> On Apr 3, 2021, at 1:26 PM, Bob McGraw K4TAX <rmcgraw@blomand.net> wrote:
>
> Usually those counters have provisions to set the IF offset such that it
> reads correctly. Then one can calibrate it to the closest Hz or so.
>
> The true accuracy depends on the counter time base accuracy and stability.
>
> Bob
>
> Sent from my iPhone
>
>> On Apr 3, 2021, at 12:10 PM, Winston <jones_winston@bellsouth.net> wrote:
>>
>> I bought a cheap Chinese frequency counter bar from eBay. I wired the
>> counter input to the output terminal from the PTO box on my 509. It can be
>> reached by sliding open the bottom cover on the radio cabinet.
>> I knew the MHz readout would read wrong since it’s the injection frequency,
>> but I could use four lowest digits (for example, 330.5), plus the known MHz
>> from bandswitch, to determine my exact frequency, to hundred hertz.
>> However, the readout was 300 hertz lower than the actual frequency. I
>> couldn’t find an adjustment on the counter to zero it, so later disconnected
>> it. It was only a temporary test setup. My plan was to mount the counter in
>> a box, and use cables with RCA phono plugs to get 12V operating power for
>> counter, and rewire the 509 AUX phono jack to bring out the VFO signal.
>> I haven’t done anymore work on it, but may get back to it sometime.
>> -de K4CWQ.
>>
>> Sent from my iPhone
>>
>>>> On Apr 2, 2021, at 2:41 PM, ROLAND HOWELL via TenTec
>>>> <tentec@contesting.com> wrote:
>>>
>>>
>>> Good Evening Gents
>>>
>>> Question for you, is it possible to fit a frequency counter to the above
>>> radio, It would nice to know what the actual 'F' is in relation to the
>>> scale.
>>> If anybody has done this mod, please advise and if possible supply
>>> connection details, although the radio is sold i would like to supply the
>>> new owner with as much info as possible.
>>> 73
>>> Snowy G0HZE
>>> _______________________________________________
>>> TenTec mailing list
>>> TenTec@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/tentec
>>
>> _______________________________________________
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>
>
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