Thanks to all that replied. I think that I found a couple of suitable
replacements already using the information received.
73's
Todd
N4JRZ
On 1/27/2012 9:22 AM, Jim Hargrave wrote:
> Todd,
>
> The Zener is a 13v. However it will work with a 12v which is easier to find.
> The actual voltage is not critical as long as it will calibrate. You can add
> a 1N4000 diode in series with the Zener if you need a little more voltage.
>
> I removed R2 (180 ohm) and the zener and replaced them with a 7812 when I
> installed the RotorEZ interface. It provides a little better regulation. You
> can also add a 1N4000 on the ground side of the 7812 and it will raise the
> voltage to about 13.2v.
>
> Another advantage: the 7812 will provide sufficient current to support a
> couple of LED's for the meter light if your dial light burns out.
>
> 73s de Jim
> W5IFP
>
>
> > -----Original Message-----
> > From: towertalk-bounces@contesting.com
> > [mailto:towertalk-bounces@contesting.com]On Behalf Of Todd Coulter
> > Sent: Thursday, January 26, 2012 6:52 PM
> > To: TowerTalk@contesting.com
> > Subject: [TowerTalk] Ham II Control Box
> >
> >
> > I am trying to replace the zener diode in a Ham II control box,
> > but I am not sure exactly what it is. The markings on it are
> > "13VR". Can anyone tell me what this crosses to (Specs?) so
> > that I can hopefully run to the local Radio Shack and pick up a
> > replacement diode. Thanks.
> >
> > 73's
> > Todd
> > N4JRZ
> >
> > _______________________________________________
> >
> >
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
>
>
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