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Re: [TowerTalk] Ham II Control Box

Subject: Re: [TowerTalk] Ham II Control Box
From: Todd Coulter <Coulter@bellsouth.net>
Date: Fri, 27 Jan 2012 09:35:09 -0500
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
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
>    >
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>
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