|[AMRadio] Safe Metering for Blind Operators|
Edward B Richards
zuu6k at juno.com
Mon Jan 3 14:50:38 EST 2005
I have a Heathkit DX-100B. The plate meter is across a .1 ohm resistor
from the center tap of the HV transformer to ground. This should serve
your needs. Good luck.
73, Ed Richards K6UUZ
On Mon, 3 Jan 2005 12:43:25 -0600 "Mike Duke, K5XU" <k5xu at jam.rr.com>
> K4KYV wrote:
> "In my homebrew rigs with triode finals, I place the plate meters
> common point for grid leak/bias supply and PA filament, and ground.
> Gates BC1-T does it the same way, with no HV on the meter."
> I've been reading the discussion of safe metering with great
> interest, as
> perhaps explained by my subject line and signature.
> I would love to find a good plate modulated transmitter in the power
> of a DX100 or Valiant, in which the plate meter would not have the
> plate voltage across its terminals. Is anyone aware of a commercial
> surplus transmitter with this design feature?
> I could easily and safely tune such a transmitter by connecting an
> meter-reading device across the meter terminals. I still have the
> which I used successfully with a DX60, and very cautiously with a
> Ranger from 1969 - 1974. I learned quickly that the ranger meter is
> at full
> plate potential. The good news is that I lived to tell about the
> I also recall reading somewhere of using a voltage divider in order
> obtain a safe potential level in the external audible reader. If
> anyone on
> this list has ever encountered a transmitter which was modified in
> this way,
> I'd like to know more about how it was done, since I'd love to put a
> on the air in order to re-create my first station.
> The point can be made that the easiest route is to put a rice box
> and linear
> combination on the air. Yes, that would be the easiest thing for
> but, not nearly as much fun!
> Mike Duke, K5XU
> American Council of Blind Radio Amateurs
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