[R-390] Dittmore Freimuth vs EAC

[Les Locklear]

As Scott said, they are "newer." They also had better specs than the older 
Collins filters. The Collins were fine tuned by using dental drills on the 
discs to enable them to resonate at the proper frequency. The 
Dittmore-Freimuth filters were manufactured using much improved techniques. 
There was another manufacturer of R-390A mechanical filters, Whitewater.

Les Locklear
Gulfport, Ms.
DX'ing Since '57
http://www.hammarlund.info/

----- Original Message ----- 
From: "Richard" <theprof at texoma.net>
To: <r-390 at mailman.qth.net>
Sent: Friday, July 20, 2007 7:35 PM
Subject: [R-390] Dittmore Freimuth vs EAC


Is the only thing that differentiates the Dittmore Freimuth models from the
EAC the IF deck?  My 1968 Dittmore Freimuth has matching contract numbers
for most modules and it just looks like an EAC.  The IF deck is an old
Collins (I changed it out with an EAC).   All the posts about the Fowler got
me to thinking about it.  Is there something "special" so I would want
Dittmore Freimuth filters?

73 de Richard W5SRB

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