[Elecraft] OHR WM-1

[Gregg R. Lengling]

It would change the calibration procedures.  It uses very low current so if
you want to use 12 volts just put a dropping resistor and a 9volt zener
after the dropping resistor.

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of thom2 at att.net
Sent: Wednesday, November 29, 2006 3:09 PM
To: w3fpr at arrl.net; Paul Del Negro; elecraft at mailman.qth.net
Subject: RE: [Elecraft] OHR WM-1

Here is the link for the 1990 QST project:

http://www.arrl.org/tis/info/pdf/9002019.pdf


Does anyone know if the WM-1 can take 13.8 volts or do I need a 9 volt
voltage regulator.

Tom
WB2QDG
K2 1103

 -------------- Original message ----------------------
From: "Don Wilhelm" <w3fpr at earthlink.net>
> Paul,
> 
> The OHR WM1 was based on the QRP Directional Wattmeter by Roy LeWallen,
and
> although I don't know how OHR may have changed it, I would believe that
the
> calibration procedure is quite similar.  You may want to check the QRP
> Directional Wattmeter article originally published in QST Feb 1990 and
> appeared in several editions of the ARRL Handbook and Antenna book after
> that time.
> 
> 73,
> Don W3FPR
> 
> > -----Original Message-----
> >
> > Does anyone have the alignment instructions for the Oak Hills Research
> > WM-1 wattmeter?  Now that I have the K2 I want to use mine again.
> > Changed the battery and would like to re-calibrate it but can't find the
> > instructions.  And thanks to all for help with my previous questions.
> > Great group!
> > 73s
> > Paul
> > N2PD
> 
> >
> 
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