[AMPS] Filament choke rod material

Vic Rosenthal rakefet@rakefet.com
Tue, 23 Mar 1999 14:36:57 -0800


I have a couple of Amidon R33-050-750 ferrite rods.  They are 1/2" x 7-1/2" in
size.  They make these rods with R33 and R61 material; the R33 has a
permeability of 800 and the R61 of 125.

My question is: can I use the R33 rods for filament chokes at 1.8-30 mHz? 
Amidon says in their booklet "CHOKE APPLICATIONS: ...the #33 material should be
selected for 40 and 80 meter bands and the #61 material is most suitable for 10
through 40 meters"

Has anyone made filament chokes using these rods, and if so which material did
they use?

73,
Vic, K2VCO
Fresno CA

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