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[AMPS] filament chokes

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Subject: [AMPS] filament chokes
From: (2)
Date: Thu, 26 Jul 2001 00:26:22 -0700
>I just found out that RF Parts no longer sells the 52 amp filament choke.  
>Does anyone else sell these parts?
>Ken W2DTC
/\    Why put a 52A bifilar choke in the secondary when one 3A bifilar 
choke in the primary plus one 3A choke in the C.T. would work just as 
well.  To do this trick, mount the filament transformer on a 1/8" thick 
G-10 epoxy-fiberglass rectangle to insulate it from chassis gnd.  Bypass 
both transformer windings  - plus the C.T. - to the core with c. 0.01uF, 
1600v disk-cer. caps.  The choke in the C.T. carries the B- return.  For 
160m, ?15uH chokes are ok.  Measure the C from the fil. transformer core 
to chassis.  This C  becomes part of C2 for the tuned inputs.  Modern #20 
AWG high-temp. electric motor wire will easily carry 3A.  

have fun, Ken

-  R. L. Measures, 805.386.3734,AG6K,  

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