[R-390] A 6kc. mechanical filter for a R-390a?

[Bob kb8tq]

HI

You will have to use some sort of transformer match. Doing really wide range 
impedance matching with networks is a pain. You probably are going from megohms 
to hundreds of ohms …

Bob

> On Jun 14, 2017, at 8:57 PM, Al S. <racalra17 at gmail.com> wrote:
> 
> I have one of the more modern blue cased Collins mechanical filters here.
> It was apparently used in the Racal 6790 receiver BW is 6.0 kc. 526 9957
> 040.
> 
> This filter is designed to be used in that SS receiver and for lower
> impedance, than the higher impedance the stock 390a filters see.
> 
> I would like to experiment with this filter in a 390a. Any ideas on
> toroidal matching to the IF deck in the 390a.
> 
> Thanks
> 
> Al VE3AJM
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