[Collins] 75S-1 question

[Dr. Gerald N. Johnson]

On Sat, 2006-05-27 at 17:42 -0400, TJRachwal wrote:
> Hi All,
> 	I've recently gotten into Collins S line gear....I was given (free!) 
> a 75S-1 which cost me $1000.00.....I HAD to buy a 32S-1 and a few 
> extras to go with it didn't I ?  Anyway, here is my question.  The 
> 75S-1 has a Waters Q Multiplier installed; do I need a cw filter (I 
> do 99.9% CW) and if so, what is the model number of a 500 HZ 
> filter?  I see someone has several filters for sale now and don't 
> want to miss it if it's needed.
> TNX for all the past help
> 
> 73...Ted K8AQM
> 
> 
My 75S-3B has a q multiplier built in but its only used for a tunable
notch. Not so good about separating CW signals in a crowd through the
SSB filter.

The CW filter is round, needs a BFO crystal to match. I'm sure the model
and part numbers are in the 75S-1/2 receiver manual. I bought the filter
and crystal for my dad's 75S-2 back about 1964. I found the box, but
can't see any number for the crystal.

But from the manual, the filter is model F455Q-5, cpn 526-9367-00. The
crystal is 455.8 KHz, cpn 290-8707-00.
-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer