Very interesting Jerry. I so something similar here as I use an
Astron 35 amp ps and a rigrunner power distribution system.
I can then just plug-in whatever rig I choose. Very convenient.
The rig runner holds the wide blade fuses for each circuit so that
takes care of the short circuit protection. I use 15 amp fuses.
Never looked for 16's.
BUT........I still put a Airpax breaker in line with the otherwise
"current unlimited" rigs. I am concerned about the I squared T
rating of the fuse vs the rating of the power transistors. A condition
where we draw very high current will clear the fuse quickly and my
experience is the same as yours..........the fuse clears before the
A transistors. :-)
But I wonder about the never never land where we are exceeding the
max current rating of the PA transistors but not so high to quickly blow the
fuse. I guess I need to find the I square T curves and see what they say and
think
this through a little more.
73 de Lee WA3FIY
wa3fiy@radioadv.com
On 11 Mar 2003 at 23:28, Dr. Gerald N. Johnson, electr wrote:
> I use a 16 amp large blade size automotive fuse to protect my Corsair
> II. So far I've blown two or three, no PA transistors.
>
> I built a relay into my power cord for reverse polarity protection and
> for power switching using the internal switch. For polarity protection I
> put a diode in series with the relay coil so that it only works for
> proper polarity. I put a diode across the coil for inductive kick
> protection (which also helps in polarity protection). I used a 30 amp
> automotive cubic inch accessory relay.
>
> 73, Jerry, K0CQ
>
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> Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
> Reproduction by permission only.
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