Re: [TenTec] 229A SWR Circuit - UPDATE

[Carl Moreschi <n4py2@earthlink.net>]

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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