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[AMPS] Plate RFC choke design

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Subject: [AMPS] Plate RFC choke design
From: (km1h @
Date: Fri, 27 Mar 1998 13:43:02 EST
On Fri, 27 Mar 1998 17:45:34 -0700 "Richard W. Ehrhorn" <>
>Hi Guys....   Just one comment
>-----Original Message-----
>From:  Rich Measures []
>Sent:  Friday, March 27, 1998 6:06 AM
>That's the popular, traditional, cherished, old theory, at least.
>However, orienting two coils end-to-end seemed to me like it would
>enhance coupling, not decoupling.  .  I built various hv rf chokes to 
>check the cherished theory out.   I observed that chokes wound with 
>supposed anti-resonance gaps have pretty much the same resonances as a
>same-L choke wound without gaps.
>[Richard W. Ehrhorn]  ...... Agreed 100% emphatically, Rich. I wonder 
>anyone ever really analyzed the old variable-diameter and/or 
>73,   Dick  W0ID >

Dick, the old National R-175 was a part of almost every amp project until
15M came was hot at 21 MHz. The replacement was the R-175A but
to my knowledge no one else has continued with that concept. 
I have a NIB R-175A and you just got my interest to take some
measurements but have to wait a few days.....too many priorities..too
little time.

Remind me if I forget but just got another call about my 88 yr old may be heading to NC soon. I'll have the laptop with me also.

73  Carl  KM1H

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