[R-390] Mechanical filter alignment

[Gordon]

Thanks Miles,
  All of the black beauties have been replaced.
I checked from terminal 4 to ground of TB-102 and it is 1.6 megohm.
Does that indicate a leaky by-pass cap ?

Thank you.

Gordon
N6WK


On 5/26/2013 4:30 PM, k2cby wrote:
> You may be barking up the wrong tree so far as AGC problems are concerned.
>
>   
>
> The most likely failure mode for the AGC bus is a leaky bypass capacitor,
> not the AGC delay capacitor C551, which is a very solid unit.
>
>   
>
> Open the jumper between terminals 3 and 4 of TB-102.  Measure the resistance
> from Terminal 4 to ground. It should be infinity. If it isn't your problem
> is one of the .005 uF bypass capacitors on the AGC bus.
>
>   
>
> If the resistance from Terminal 4 to ground shows open, check C543, C547 and
> C548, all of which are "black beauties" and should be replaced in any case.
>
>   
>
> Miles B. Anderson, K2CBY
> 16 Round Pond Lane
> Sag Harbor, NY 11963
> Tel.: (631) 725-4400
>
> Fax.: (631) 725-2223
> e-mail: k2cby at optonline.net
>
>
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