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[TenTec] 12V OPS C-21

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Subject: [TenTec] 12V OPS C-21
From: Dennis Ernst <ernst@spiff.Tymnet.COM> (Dennis Ernst)
Date: Mon, 8 Feb 1999 14:53:22 -0800 (PST)
Ten-Tec used to sell a "1170 DC circuit breaker" for mobile operation
of the C-21.  It appears in the Ten-Tec ad used as part of the info
on the C-21 at:



> Alan:
> The 12 V operation was accomplished by "back feeding" the 12 into the
> "Auxiliary 12V jack" (phono jack).
> This had to be done carefully, as you then had NO meter indication for
> input power.  You also had no "overcurrent crowbar" to shut down the Power
> supply.
> I used to run the C-21 mobile this way, and at first I didn't know how much
> power I was getting out until I put my Bird Thruline in the line.
> I was getting 70 watts OUT!  OOPs....  Fortunately I hadn't had any long
> transmissions up to that time.  From then on I limited it to 30/35 so I
> wouldn't have to replace any zapped finals.
> If you decide to do this, you should use an ammeter in the DC line...and
> keep the current to around 5 amps or so.
> At 09:56 AM 2/5/99 EST, you wrote:
> >
> >I noted a recent ad that stated the C-21 ran on either 12v or 120vac.I have
> >scoured my manual and there is not information regarding 12v ops. Was there a
> >later version that allowed for 12v ops? Is it simple to convert?   Alan
> >

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