[Collins] 75S3B info

[David Knepper]

Martin, I was told by a Collins engineer from the plant in Newport Beach,
CA, that the mechanical filters do have a shelf life - I believe that he
told me that Collins estimated the shelf life to be a minimum of 15 years.
How they arrived at that number, I am not quite sure,  Tony, WV3Z, has been
successful in resoldering the coupling transformers inside the filters.    I
have had several fail me that were used in the the 75A-4.  That is why you
never buy one unless you can test it,

Thanks

David, W3ST
Publisher of the Collins Journal
Secretary to the Collins Radio Association
To Join the CRA go to www.collinsra.com
Nets:  3805 Khz, Monday/Wednesdays 8 PM EST and 14250 Khz Saturday, 12 Noon
EST

----- Original Message -----
From: "Martin Sole" <msole at loxinfo.co.th>
To: "'Glen Zook'" <gzook at yahoo.com>; <collins at mailman.qth.net>
Sent: Saturday, June 25, 2005 10:43 AM
Subject: RE: [Collins] 75S3B info


> I think Glen raises an interesting point. Do they last forever?
Disclaimer:
> I have no hard laboratory spec measurements to back this up but...
> I have tried a number of S line SSB filters in my 75S3B. For the most part
> they all 'sound' the same but some do 'sound' different. Unmatched (see I
> said it wasn't very scientific) tests with a tracking generator and
analyser
> show different pictures of the pass band for different filters. Not to say
> they are not all in spec but just wondering if age might play a part.
>
> Signed
> Curious
>
>
> 73
> Martin, HS0ZED
>
>
> -----Original Message-----
> From: collins-bounces at mailman.qth.net
> [mailto:collins-bounces at mailman.qth.net] On Behalf Of Glen Zook
> Sent: 25 June 2005 08:47
> To: David Thompson; collins at mailman.qth.net
> Subject: Re: [Collins] 75S3B info
>
> Collins filters use air and not any type of foam.
> Therefore you don't have to worry about the foam disentigrating.  Unless
> they are dropped, Collins mechanical filters normally last "forever".
>
> Glen, K9STH
>
>
> --- David  Thompson <thompson at mindspring.com> wrote:
>
> Don't know about collins but I had a KW 2000E with a Kokusai 455 filter.
The
> KW 2000 series was the RAF/RCAF version of the KWM2.
>
> Glen, K9STH
>
> Web sites
>
> http://home.comcast.net/~k9sth
> http://home.comcast.net/~zcomco
>
>
>
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