[HomeBrew] Backwards s-meter problem

[bhat srikanth]

Just a wild guess, (disclaimer: I have no idea or
experience on this type of meter:)

Try measuring the direction, magnitude of current when
meter is at rest on left side after radio is ON, with
no signal. This should give you the 'bias' current
direction / value which you have to cancel out when
you have to incoporate a regular meter. Once you do
that, you could use your regular meter, but probably
need to reverse the leads if the existing meter had
dcreasing current for increasing signal (S). 

Maybe you could cancel out this bias(it maybe called
something else)current using a preset potential
divider on the coresponding lead of the replaced meter
to get appropriate potential to nullify it at '0' S. 

good luck, best 73
de Sri, VU2SBJ


--- kwylow zinjanthropus <catman351@yahoo.com> wrote:
> ** HOMEBREW REFLECTOR - Please do NOT cross-post
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> 
> All:
> 
> Been having problems with trying to figure out how
> to adapt a 
> conventional "forward reading" meter (i.e. the
> needle is on the left side of the 
> meter wwith zero signal and/or the radio off and
> rises with more signal 
> toward the right) in a National NC-57B circuit where
> when the radio is off, 
> the S-meter rests totally on the right, then when
> turned on, the needle 
> rests at 0 on the left and then operates as a
> conventional meter. Does 
> anyone have a fix? I'm using an old backlit RME
> meter that reads 
> normally (i.e. zero/radio off-meter rests on the
> left and with signal and 
> radio on, meter deflects to the right). Let me know
> before I go bald 
> pulling all my hairs out!!!!
> 
> Cal N6KYR
> 
> 
> 
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