Neutralize finals

[Ed Richards]

This is a far better way to do it. All you get is the capacity coupling
from grid-to-plate in the finals.  Properly neutralized, an equal amount
of RF 180 degrees out of phase is coupled through the neutralizing
capacitor, to cancel this voltage, leaving 0 volts. It requires a
sensitive RF probe to a VTVM with a low voltage range. I use a probe I
made using a  1N34 germanium diode (more sensitive than silicon.) into a
IM-25(?) SSVTVM. with a .15 volt range. A 1.5 volt range will work but
not as sensitive.

Ed Richards

On Mon, 12 Feb 2001 12:08:16 -0500 Greg Hockenjos <nunu726 at LYCOS.COM>
writes:
> Hello. I have tried the method of neutralizing the finals on my
> hw-101 that is described by removing the 100 ohm resistor from pins
> 3 on V8 and V9 and disconnecting the red wire going into the final
> cage. When I try to get a reading I get no voltage, ac or dc with
> the volt meter probe in the antenna jack and the ground grounded,
> with the mic gain up or turned down. Am I missing something? The
> radio neutralizes by the heath way in the manual by turning the
> screw and checking minimum plate current and maximum power out at
> the same setting. Greg.
>
>
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