[Amps] PA choke design

[Radio WC6W]

Hi Carel,
  Some antique possibities:

     Miller 4534 or 4535
     Bud CH-568
     Johnson 102-754   

  Though, if you're sourcing from E-Pay, beware that those folks don't always go by the names & numbers nor use them correctly if they do! :-)

73 & Good morning,
  Marv WC6W 

http://qsl.net/wc6w/


--- On Tue, 6/28/11, pc5m, Carel <pc5m at xs4all.nl> wrote:

> From: pc5m, Carel <pc5m at xs4all.nl>
> Subject: [Amps] PA choke design
> To: Amps at contesting.com
> Date: Tuesday, June 28, 2011, 8:26 AM
> Hi, I know it has been discussed
> before, but can't find any good pointers.
> For  my single band 160mtrs PA I would like to 
> design the plate choke
> inductor. I would like to get the group opinion on 
> - using a long/big normal air wound coil to get around 1 mH
> (coil  not
> involved in "matching" i.e. impedance well above circuit
> impedance at the
> anode. 1 inch wide/several inch long/500turns)
> - using a smaller air wound coil such that the choke will
> become part of
> matching circuit, RF currents flowing in this case.
> - using a ferrite core to get a smaller package. Not sure
> how big a ferrite
> core I would need to keep 1mH of inductance even when
> several amps of  DC
> current are present (saturation).
> 
> In this case I am not too concerned (I think..) of
> parasitic resonance's of
> this coil, as long as it is a good inductor at 2 MHz : - )
> 
> Any ideas ? pro - con's ?. Tnx, Carel.
> 
>  
> 
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