Jack Painter wrote:
wrote
A while back I decided to run my R8B off an external power supply. I
can't say my decision to do this was based on any very sound reasoning.
I'd read some old posts in rrr about how keeping heat out of the case
would promote the long term health of the receiver and, being a little
paranoid about protecting my investment, I decided to go with an
external supply (despite the fact that the R8B really doesn't get very
warm when running off its own internal supply). My guess is that that
there's no real need to use an external supply and that my desire to
protect my investment made me a sucker... In any case, I've tried a
couple of external power supplies, most recently a 13.8 VDC / 3amp
supply from Radio Shack, and both of them introduced at least some kind
of noise or hash into my reception. It was often very subtle, but
enough to be a real problem when it comes to weak signals. When the R8B
is running off its own internal supply, it's much quieter. It seems to
like it's own, internal supply.
So my question is, should just I forget about using an external supply?
Thanks in advance!
Steve
Heat is an enemy of all electronics, and even though the R8B does run cooler
than any other receiver I own, it could improve frequency stability to run
it even cooler from a DC pwr supply.
Btw I also use a RS 3a regulated pwr supply (to run an ATU) and except for
the spike of turning it on/off, have never noticed any hash on receivers
from it.
I use a garden variety (Radio Shack) 12V power supply. It does make a
significant improvement in lowering the case temperature but it's hard
to say if this will extend the componant life over the long run. I tend
to think it will, so that's why I do it. There is one down side to the
external DC supply though. When the internal supply is used, the clock
is sync'd to the AC 60-HZ frequency which makes it more accurate than
with the DC supply.
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