[TenTec] Argonaut 509

[Winston]

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 at 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 at 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 at 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 at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/tentec
>> 
>> _______________________________________________
>> TenTec mailing list
>> TenTec at contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
> 
> 
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec