Most Astron Supplies will easily operate at 15 volts
output if you mod the crow-bar circuit for the higher
fire/trigger voltage. If fact, they actually work
better at the higher output voltage.
I WOULD NEVER DISABLE THE CROWBAR CIRCUIT IN ANY
ASTRON SUPPLY UNLESS YOU WANT BBQ RADIO. (get my
hint with the cap letters?) It's not a question of
if, only when it will be required (unless you have
one of the new generation regulator boards). I would
not trust this type linear regulated high current
supply to operate without a crowbar protection
circuit.
Voltage (battery) back-feed to the supply terminals
will kill many supply regulator circuits unless you
know how to inspect the circuit design and retrofit
the circuit to pass the reverse voltage source back
to the filter caps (and any other low z sources on
the input side of the regulator circuit)
Sometimes (many times) it's simply a proper size
diode in the right location... sometimes you're
not so lucky. Depends on which regulator pc board
you have.
Floating batteries will also work only if you have
the reverse voltage back-feed issue properly dealt
with. The power-gate is pretty much only a diode
isolation circuit and quite lossy. You might save
a bit of money by purchasing a similar battery
isolation unit at a local RV Center (Parts Supplier),
we've used them many times in the past.
A judgement call should be made... do you want the
repeater to operate off the battery/supply or have
the battery as a back-up power source.
The back-up power source layout can be a simple
battery, diode & resistor combination. If you're good
with Fets, you can even remove the forward voltage
drop of the series connected diode.
cheers,
skipp
www.radiowrench.com/sonic
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