"Jamie" wrote in message
...
wrote:

Can I use an old computer for a power supply for my mobile 2 meter 50
watt radio? Will the radio put out the same power as if it was in the
car? It calls for 13.8 volts.

depends on the radio.
most ham Radio's these days require a min of 13.0 , anything less, the
results is unpredictable.
the computer supply even though quite good may not be up to snuff for
that unless you alter the regulator a bit.



Often that's trivial, many power supplies have a pot in them to tweak the
output. Note that you'll need a load on the 5v for most of them to regulate
properly, an automotive brakelight bulb works well and doubles as a pilot
light.