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[AMPS] Plate Chokes

To: <>
Subject: [AMPS] Plate Chokes
From: (km1h @
Date: Fri, 27 Mar 1998 08:19:44 EST
All good information.

Alpha used/uses a sectional RFC that is switched by a bandswitch wafer
contact. Expensive but it allows considerable leeway for out of ham band
use. I have seen others that use a LV switch wafer to control vacuum
relays but this was for commercial 5KW 2-30MHz continuous coverage. 

The bottom line should be to build to your own requirements and get as
complicated as necessary. Overkill just complicates the layout and adds
For just the 9 HF ham bands, 1 RFC will suffice for most builders in the
1-2.5kW range.  

I still feel that #28 wire is sufficient, it is used in the big
Ameritrons, MLA-2500,  Amp Supply LK-800 and even the Alpha 77DX/SX.
The Ameritron measures 212 uh; I can provide winding info if desired.

73  Carl  KM1H

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