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Organization: COMMtronics Engineering / World Scanner Report
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Newsgroups: rec.radio.scanner
> Just hooked up a small utility battery (170 CCA) to power one of my radios here
> in the house. Radio draws about 7A peak on transmit, and this seems to work
> well. Planning on wiring in a trickle-charger (1-2A), and leaving it plugged
> in to assure the battery always has a full charge. Wal-mart sells these for
> $16.95. Apppears to be nothing more than a wall wart type power supply with
> the same specs. Can I simply cut off the plug, attatch the wires, and use
> these? Or is there something "special" inside the trickle-charger that makes
> it more appropriate for battery-charging applications?
Everything depends on the precise kind of battery
it is....and from what you said, I can't tell for
sure. Sounds like a type of lead-acid battery, in
which case the maximum safe trickle charge is about
13.80 volts across a "12v" battery.
If you can regulate that power supply to 13.8v and if
it has the current capacity that might be required by
the battery, then it could serve a useful purpose.
So far, I've referred to the subject title, which
appears to not be related to the text of your post, though.
If you're asking if you can run a radio off a battery
that's floating on a trickle charger, then yes. However,
of the battery drains say 5-amps on the average when
you transmit, and if the trickle is 1-amp max, then over
a period of transmitting, the battery will run down.
This brings up a subject we'll call "duty cycle". If
the drain-to-recharge rate is 5:1, then over the long
haul, you have to allow for a minimum 20% duty cycle,
with 10% being best to assure long term health of the
battery.
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| Bill Cheek ~ COMMtronics Engineering ~ World Scanner Report |
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