I would check out all the diodes in the circuit.
Carl Moreschi N4PY
121 Little Bell Dr.
Hays, NC 28635
www.n4py.com
On 7/1/2012 12:44 PM, Rick W wrote:
> I hung my DVM off the 200uA meter plug and it is completely within specs.
> Fully adjustable and it seems to be working. So it looks like the Korean
> made 229A meter has failed.
>
> I'll have to do some thinking on a replacement.
>
> Thanks for the bandwidth.
>
>
> 73,
> Rick
> VE7TK
>
>
> Website: http://www.ve7tk.com
>
>
>> ________________________________
>> From: Rick W<ve7tk@yahoo.ca>
>> To: Ten-Tec Reflector<tentec@contesting.com>
>> Sent: Sunday, July 1, 2012 8:39:29 AM
>> Subject: 229A SWR Circuit
>>
>>
>> I have recently acquired a 229A tuner. It needed a few repairs - mainly
>> mechanical - but otherwise seems in good shape. I've replaced the dial
>> elastic cord and it tunes smoothly and consistently.
>>
>>
>> I am having a problem with the SWR / Power measurement circuitry. I can't
>> get the meter to full scale and power measurements are way off. Calibration
>> is impossible.
>>
>>
>> The meter is moving - albeit nowhere near the correct deflection.
>>
>>
>> My guess is that the SWR circuit in the 229A is similar to the current 238.
>> Is there any history of problems with this circuit. Any reports of:
>> 1. meter movement failure;
>> 2. leaky capacitors; or
>> 3. open or out of tolerence resistors?
>> This is a pretty simple circuit and virtually all the parts (less the
>> meter) are likely in my junk box. If there's a history of a part failure I'd
>> like to start there.
>>
>>
>> Thanks.
>>
>>
>> 73,
>> Rick
>> VE7TK
>>
>>
>> Website: http://www.ve7tk.com
>>
>>
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