[Collins] You Won't Believe This

[James Miller]

May be high electrostatic charge from that single HV lead leaking to the
needle mechanics causing the needle to be attracted to the needle stop or
the case material.
Good luck
Jim N4BE
----- Original Message ----- 
From: "David Knepper" <cra at floodcity.net>
To: "Discussion of AM Radio" <amradio at mailman.qth.net>; "Collins Mail List"
<collins at mailman.qth.net>
Cc: "Merz Donald S" <merz.ds at mellon.com>; "Tony Barockteer"
<Barockteer at aol.com>
Sent: Saturday, January 01, 2005 6:30 PM
Subject: [Collins] You Won't Believe This


> I own a Collins 20V-3 broadcast transmitter that is at the Collins Radio
> Center.
>
> The transmitter has been restored and worked perfectly after modifying it
to
> 160 meters.
>
> Now, the plate current meter (0-800 ma.) is reading to the left of "0"
with
> only the high voltage lead from the smoothing choke attached!!
>
> The high voltage meter is showing 4000 volts.  The positive post of this
> meter goes to the positive post of the plate current meter through some
> multiplier resistors.
>
> That is right, only one lead connected and the meter is reading negative
> current.  I switched this lead to the negative post and the meter still
> deflects downward past zero.
>
> Disassembled the meter to see if it may have a carbon path through the
case
> to ground.  Nothing.  The meter looks "normal."
>
> When I hook a multimeter to the terminals:  red to positive post and black
> lead to negative post on the meter, the needle deflects upward, which is
> normal for a current meter.
>
> I am really stumped on this problem.
>
> If someone told me that a current meter could deflect left of zero with
only
> one lead attached, I would have thought that this was some kind of psychic
> phenonomen.
>
> Could the meter have changed polarity?
>
> Can anyone tell me what is going on.
>
>
> Thanks
> Dave, W3ST
> Publisher of the Collins Journal
> Secretary to the Collins Radio Association
> www.collinsra.com
> Nets:  3805 Khz, Monday/Wednesdays 8 PM EDST
>           14250 Khz Saturday, 12 Noon EDST
>
>
> ______________________________________________________________
> Collins mailing list
> Home: http://mailman.qth.net/mailman/listinfo/collins
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:Collins at mailman.qth.net
>
> Win a new Icom IC-756PROIII and help QSL/QTH.net
> Details at: http://mailman.qth.net/index.html
>
>
>
> -- 
> No virus found in this incoming message.
> Checked by AVG Anti-Virus.
> Version: 7.0.298 / Virus Database: 265.6.7 - Release Date: 12/30/2004
>
>



-- 
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.298 / Virus Database: 265.6.7 - Release Date: 12/30/2004