[ARC5] Plate impedance...

[Bob Macklin]

It was not me that came up with the 3.5K number. But I agreed with it.

As Marty comments:

<<English sure open for criticism.  Egg:

     red:  the color
     read: finished reading>>

READ is pronounced two was. The like I will read the book and I have read
the book!

I assumed the question was in relation to the necessary impedance of the
modulation transformer.

Do I remember that some SCR-274 transmitters had screen modulation?

Bob Macklin
K5MYJ
Kent (Seattle), Wa,
"Real Radios Glow in the Dark"


----- Original Message ----- 
From: "Marty Reynolds" <cosmoline at aa4rm.ba-watch.org>
To: "Brian Clarke" <brianclarke01 at optusnet.com.au>
Cc: <arc5 at mailman.qth.net>
Sent: Monday, December 15, 2008 9:28 AM
Subject: Re: [ARC5] Plate impedance...


>
>
> > The originator of this thread asked:
> >
> > Anyone know what the plate impedance is of a pair of 1625
> > at, say, 7.0 Mhz, a plate voltage of 550 VDC, and a plate
> > current of about 150 mA?
> >
> > Please note that Ken asked about 'plate impedance' not 'load
resistance'.
> > Ken did not ask the question you chose to answer.
> >
>
> OK Brian
>
> Think Bob Macklin answered with ohm's law.  ~3500 ohms & that's
> right number for modulator match, ie the load resistance.
>
> W7QHO gave a a series of rules of thumb for match to a tank ckt.
> These had tube conduction angles rolled in.  IE, they
> gave the plate impedance for operation classes
>
> English sure open for criticism.  Eg:
>
>      red:  the color
>      read: finished reading
>
>  Marty
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