I blew the Astron Rs-20A as I described. I blew a Astron RS-35M in the
same fasion because a strand of wire from a stranded power cable made
contact with the other lead and before I could snap off the power, my shack
was full of that good old burnt electrical smell!
Now, regarding the MFJ power supply mentioned in another post that I made
today, I had a final transistor short on my Icom 706 MkII, and with a
shorted load across the MFJ supply, it simply turned itself off until I
removed the shorted load. That's the way it should be!
--Lou K2LKK
At 03:06 PM 1/8/2005 -0500, you wrote:
>I've shorted my power supply once, complete mistake, as have a couple people
>I know with the RS-35 Astron supplies and it didn't hurt them, I've heard
>the RS-20 is weak though in that department, I heard they get very hot too,
>or come components that don't on the 35 do so that all might be related.
>----- Original Message -----
>From: "Louis Kim Kline" <[log in to unmask]>
>To: <[log in to unmask]>
>Sent: Saturday, January 08, 2005 3:01 PM
>Subject: Re: accessible VHF equipment
>
>
> > Hi.
> >
> > I had a situation where I hooked up a power cord backwards and the radio
> > was protected by the diode, but the Astron RS20A belew the SCR, the
> > voltage
> > regulator and the pass transistors when presented with a shorted load. Be
> > wary of this if you use Astron power supplies--I have had two of them take
> > this failure mode. Their current limiting circuitry is insufficient to
> > protect the supply from an accidental short circuit, and they do blow
> > their
> > cool very quickly. To my way of thinking, a blown power supply is only
> > slightly better than a blown radio. Either way, you are off the air until
> > you can either get someone to repair it or the friendly brown truck brings
> > you a new one!
> >
> > 73, de Lou K2LKK
> >
> > At 08:18 AM 1/7/2005 -0500, you wrote:
> >>I'd never depend on that diode to protect against hook it up backward,
> >>lost
> >>a radio that way that was supposedly protected and that was with sighted
> >>help, kid forgot black was negative and red was positive. I don't let him
> >>forget it either.
> >>----- Original Message -----
> >>From: "Howard Kaufman" <[log in to unmask]>
> >>To: <[log in to unmask]>
> >>Sent: Friday, January 07, 2005 7:29 AM
> >>Subject: Re: accessible VHF equipment
> >>
> >>
> >> > Eric, their are two wires that go from a power supply to the radio.
> >> > One is positive and 1 is ground. The radio is protected by a diode to
> >> > protect against reversing the wires.
> >> > The way it works is the right one. The other is the wrong. On the
> >> > choice
> >> > of radios, how much power do you need to accomplish what you want to
> >> > do? How intense is the RFI in your area?
> >> > What are your antenna options? How many bands and which ones do you
> >> > need
> >> > in your area?
> >> > What else do you want to do with the radio?
> >> >
> >
> > Louis Kim Kline
> > A.R.S. K2LKK
> > Home e-mail: [log in to unmask]
> > Work e-mail: [log in to unmask]
> > Work Telephone: (585) 697-5753
> >
Louis Kim Kline
A.R.S. K2LKK
Home e-mail: [log in to unmask]
Work e-mail: [log in to unmask]
Work Telephone: (585) 697-5753
|
