[Drake] Matching T4x filters for R4C first IF

[WB6WCW at aol.com]

In a message dated 11/6/2012 10:51:14 A.M. Pacific Standard Time,  
w3nu at roadrunner.com writes:I see now that the author of this mod is the  present 
ARRL CEO David 
Sumner K1ZZ under his former callsign  K1ZND.
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If you are an ARRL member, the article can be downloaded from the  ARRL.org 
web site........i.e.,
 
January 1972 QST, Pages 30 and 31, "A Crystal Filter for the Drake  R-4B", 
by David Sumner, K1ZND.
 
Also, John Devoldere, ON4UN, has some details in the March 1976  CQ 
Magazine, Pages 37-40,
"Improved Performance for the Drake R-4B & T-4XB".  He also  describes the 
"Magnum 6" RF Speech Processor which has always been my favorite  ....
 
73
 
Bill W6FF
Santa Barbara, CA