[R-390] Filters

[Bruce Ussery]

I appreciate the excellent discussions of theory of operation, as well as 
the photos. My understanding of the filters was minimal; now it's better. 
One description reminded me of the spring reverb units in guitar amps.

Thanks all,
Bruce WA4ZLK

-----Original Message----- 
From: Raymond Cote
Sent: Sunday, February 17, 2013 6:26 AM
To: quartz55
Cc: R-390 at mailman.qth.net
Subject: Re: [R-390] Filters

You most likely have more than 50 Collins owners reading your posts and like 
me saving them as gold for later use.
Many do. Of have the experience to comment so don't think your sharing is 
falling on deaf ears.   That goes foe all y'all
Who share your experiences. Most likely ss of the data is not accessed until 
much later and source is not listed to thank. So I thank you and all that 
take the time to post even short experiences. Someone will benefit.

Ray, longtime Collins 51J4, 388, 389, 390, 391 owner



On Feb 16, 2013, at 13:55, hat "quartz55" <quartz55 at hughes.net> wrote:

> I get the feeling like no one is really reading my posts so I may quit 
> dealing with it, too bad for someone that wants to rebuild filters.  But I 
> will post pictues on my photobucket account for anyone that is interested.
>
> Here's a picture of what I think is the center wire attached to the second 
> resonator disk on the top (output) end of the filter.  On the bottom end 
> (input), I don't see the wire like that, but I have not yet pulled out the 
> coils on that end, the center wire may be coming off the end disk there 
> and that's why I don't see it in the resonator disks.
>
> http://s251.beta.photobucket.com/user/DogTi/media/R390A/filtertopcenterwire_zps1e973e91.jpg.html?sort=3&o=0
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