My Astron 35M has plenty of power to destroy my Pegasus finals
even with the current limit.
I now have a 20 Amp circuit breaker in series with my Pegasus.
I do not plan to see if the circuit breaker will save the
Pegasus finals and I do not think it will. I am very carefull
tunning up on 40 meters from now on. I zapped my Drake T4-XC
on 40 meters one time also. I had to send the Drake back to the
factory for repairs.
Jim W7ANF
Quoting WmLB@prefer.net:
>
> 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
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