[TenTec] My Jupiter Problem.. and Power Supplies.

[WmLB@prefer.net]

Thank you Cecil. If nothing else, "peace of mind" is 
certainly worth a $9.00 investment. I WILL DO IT!

Bill, W6WLB

On 11 Apr 2002 at 18:25, Ham wrote:

> If your power supply puts has 35 amp capacity, It will limit the
> current to a little past 35 amps which will fry the finals, to prevent
> it in the future you need a fast acting breaker rated at the max the
> transmitter can take, usually 20 amps. Here is information on a fast
> magnetic breaker for use to protect finals on Ten-Tec gear;
> 
> Airpax Snapak Magnetic Breaker
> 
> Part Number: T11-1-20.0A-01-10A-V
> Handle/Style: Paddle/Toggle
> Number of Poles: Single Pole
> Configurations: Series Circuit Breaker
> Frequency - Hz: DC-50/60HZ
> Delay: Fast DC-50/60 Hz
> Cross Calibration: DC Circuit
> Voltage: 32DC
> Rated Current: 20.0amps
> Handle Color: Black
> Outer Hardware: Black Knurled Nut
> Indicator Plate: Vertical Mount
> Terminal Adapters: No 6-32 Screw Terminal Adapters
> VDE approval and CE compliant
> 
> And you can get them at Poco Sales, I bought some for around $9.00.
> 
> http://www.pocosales.com/
> 
> Cecil
> KD5NWA
> 
> 
> ----- Original Message -----
> From: <WmLB@prefer.net>
> To: <tentec@contesting.com>
> Sent: Thursday, April 11, 2002 6:11 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
> > _______________________________________________
> > TenTec mailing list
> > TenTec@contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
> 
> 



Bill

Costa Mesa, CA
Amateur Radio Station: W6WLB