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Emergency Power for Ham Radio

Topics related HAM and Shortwave radio and emergency communication

Moderator: WornOut

Emergency Power for Ham Radio

Postby Norman11 » Wed Apr 12, 2017 6:11 pm

This is a PDF from ARRL on process to set up Emergency Power for you Ham radio . Basic coverage put out in 2010

Click on the link below -

http://www.arrl.org/files/file/Public%2 ... g-2010.pdf

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Re: Emergency Power for Ham Radio

Postby cauhape » Sat Jan 13, 2018 7:46 pm

Nice PDF file, but unless I missed it, there is something they overlooked: radios have narrower voltage tolerances
that the discharge curve of a lead-acid battery.

For example, if you look at the manual for a radio which uses an external power supply, it might say something
like "12 VDC, +/- 10% or +/- 15%". If you do the math, that means that only the top half of the lead acid battery
charge is useful for the radio. When the battery gets down to half charge, the voltage is too low to run the radio.
At that point, the radio shuts off even though there is still power in the battery.

One solution is to get what's called a "battery booster". This kind of device uses circuits to take the too-low DC
voltage, convert it to AC temporarily, and then convert it back to proper 12VDC. Of course, there is no free lunch,
since it takes power to do this, but you can expect it to work at 78% efficiency. So, you could connect the radio
to the battery directly until the voltage approaches the minimum the radio can use, then insert a battery booster
between the battery and the radio and still use 78% of what remains.

In my ham shack I have a timer that runs a battery charger to trickle charge the deep cycle battery, and the battery
is always feeding the radios through a battery booster.

cauhape / K7BCV
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