[Boatanchors] RAL Band 7 Issue

[Ian Wilson]

I had trouble with the bandswitch contacts while refurbishing a RAL. Didn't
quite
get the switches operating as reliably as I wanted.

73, ian K3IMW

On Mon, Mar 26, 2018 at 5:47 AM, Joe Connor via Boatanchors <
boatanchors at mailman.qth.net> wrote:

> I need some help in diagnosing a problem. The schematic is at page 56 of
> the attached manual.
> Issue: the lower 6 bands work great, but not so much bands 7-9. Band 7 is
> dead. Bands 8 and 9 work but have low sensitivity. The upper three bands
> share three common coils.
> Suspect: C-142, a 510 pf mica decoupling cap, comes into play only when
> Band 7 is used. It's located at the rear of S-111, a bandswitch wafer. I
> suspect it because it seems to be the only component used on Band 7 only.
> Questions:
>     1. Would a leaky, shorted or open C-142 produce my symptoms?
>
>     2. Is there an electrically equivalent point where I could connect a
> replacement? C-142 is located at the rear of the bandswitch in a very
> inaccessible place. I can probably get a needle-nose pliers in there and
> disconnect one lead, but I don't see how I could get in there and replace
> the actual cap.
>
>     As always, thank you for your help and guidance.
>
>
>                                 Joe Connor
> http://bama.edebris.com/manuals/rca/ral/
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