Be sure you disconnect your antenna when there is the possibility of
lightning or heavy static. I lost the finals and a pin diode in my Pegasus.
Had to be static because not much else would explain the pin diode and the
finals. I was not even transmitting when it happened.
73, Dave, VE1ADH
----- Original Message -----
From: <WmLB@prefer.net>
To: <tentec@contesting.com>
Sent: Thursday, April 11, 2002 8:11 PM
Subject: [TenTec] My Jupiter Problem.. and Power Supplies.
>
> I have already reported to the readers here that
> Paul at Ten-Tec advised that it was necessary to
> replace the finals in my Jupiter. Rig should be on
> it's way back tomorrow.
>
> My obvious question at that point was what would
> have caused the problem. Obviously at this point, it
> is a speculative exercise, but one of the things
> that Paul suggested was that if the rig had
> transmitted into an open or shorted feedline
> (antenna).. even momentarily, it was possible that
> oscillations were initiated in the finals that lead
> to excessive current draw and their demise.
>
> He asked me what kind of power supply I had, since
> there are many PS's out there that do not provide
> the load protection needed to insure that the above
> does not occur. I told him I had a Astron 35M,
> which has been in service for several years. He
> suggested that that might be part of the problem,
> but when I asked him about Ten-Tec PS units he said
> that the current product line does not have that
> sort of protection built in either. (I gathered the
> earlier ones did)
>
> I just called Astron, who are local to me (Irvine)
> They told me that both the current RM power supplies
> and my older one had current limiting and voltage
> protection. In fact, although I have not tried it,
> he said that I could put a screw driver across the
> output terminals and observe that the voltage goes
> down to "zero" and when that short is removed it
> returns to the nominal output voltage.
>
>
> No question here... unless you want to offer
> something that might give me some comfort when I
> power up the Jupiter once again. At this point I
> can only conclude that my original finals had a weak
> link in there somewhere.
>
> Bill
>
> Costa Mesa, CA
> Amateur Radio Station: W6WLB
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>
>
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