[R-390] 2 Dud Mechanical Filters Needed

[Flowertime01 at wmconnect.com]

Fellows,

Two different paths follow,

 I also notice the passband ripple on all the filters is pretty severe. Any 
comments.
 Keith, ve3ts
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Keith,

Back in 74, 75 we had a sweep generator and scope in the shop at Torri 
Station Okinawa. We used it to inspect the filters and do IF deck alignment.

We would often see lots of band pass ripple in the mechanical filters.
We considered it acceptable and did not replace a filter just because of it 
ripple on top.

The though was the signal level was not running that high in the filter and 
thus the ripple was not causing that much audio band loss at one frequency or 
another.

Then again out application was CW and RTTY so good fidelity was not a factor.

Some though was that the filters with more ripple also had more ring.
No real collection of data to support that statement it was just a feeling the
operators and mechs shared.


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Any bad filter case will work. If you are going to restuff them you care not 
what they started life as.  A call to Fair radio and some talking may get you 
some bad filter cases for next to postage.


Roger AI4NI   </HTML>