[R-390] Filters

[chuck.rippel at cox.net]

> I have 2 R-390As.  Filters in one module seem fine, but the gain 
> drifts,
> I'm working on that.  Other module has bad 2 (weak) and 4 (dead) but 
> the 8
> and 16 seem good, but different gain through them.

At the age type of the filters, having varying gains through them is not 
all that unusual.  I wish Dave Curry was still making his most excellent 
R390A filters.

The .1 and 1 KC bandwidths are cascaded in concert with the 2kc filter. 
If it is defective, those will be affected.  You can also have a 
defective crystal filter located in the can at the left-rear of the IF 
deck.

If the .1, 1 and 2 are defective, suspect a bad 2KC filter.  I don't 
envy anyone having to change the filters.  Several of them are 
challenging at best to access.

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Chuck Rippel