[Amps] plate bypass capacitor

[TexasRF at aol.com]

OK, I give up; what is a BA rig?
 
73,
K5GW
 
 
 
In a message dated 8/10/2009 2:00:34 P.M. Central Daylight Time,  
km1h at jeremy.mv.com writes:

10X the  RL was the way it was done and all the old BA rigs had 1 to 2.5mh 
plate  chokes. That was for the old style series fed plug in coil tanks.

When  parallel fed pi nets came along the recommendation was for 4-5X. and 
it  
varied depending on who was writing it.

The first widespread mini  choke came out with the SB-200, I believe, and 
at  
90uH.

Carl
KM1H


----- Original Message -----  
From: "Bill, W6WRT" <dezrat1242 at yahoo.com>
To:  <amps at contesting.com>
Sent: Monday, August 10, 2009 2:00  PM
Subject: Re: [Amps] plate bypass capacitor


> ORIGINAL  MESSAGE:
>
> On Mon, 10 Aug 2009 16:55:58 +0000, Manfred  Mornhinweg 
<manfred at ludens.cl>
>  wrote:
>
>>
>>> I believe that the recommended  impedance of the RF choke should be 10 
>>> times
>>>  the plate load impedance of the amp not the reactance of the plate  
tune
>>> capacitor.
>>
>>It's correct that the  load impedance and not the capacitor impedance is
>>the base, but the  10 times factor is purely a rule of thumb, and very
>>wide deviations  are possible.
>
> REPLY:
>
> Ten times the plate load  impedance?
>
> For the typical 160 meter amp running 3 kV and 800  mA with a plate load
> impedance of aprox 2200 ohms, that would require  a choke with a 
reactance 
> of
> 22,000 ohms, or about 2000 uH. I  have never seen a design with that much
> inductance for the plate RF  choke, or anywhere close to it..
>
> Are you sure you don't mean  10x the reactance of the tune cap? That 
seems 
> to be
> pretty  much the standard.
>
> 73, Bill W6WRT
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