"Mark S. Holden" 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

My R8 ran "warm" on the built in power supply, and this made the top of the
radio a favorite snoozing spot for our cats. Having a cat snoozing on top makes
it run warmer.

Without the snoozing cats problem, I'd consider an external power supply to be a
belt and suspenders kind of thing. You don't need to do it, but it may prolong
the life of components.

Besides heat, the other problem with cats snoozing on your radios is eventually,
they decide the tuning knob must be a toy since you seem to enjoy turning it.

I've pretty much decided to sell my Applied Communications (Norlin) SR-2150
wideband because one of the cats is afraid of the cooling fan, and another
thinks turning the tuning knob is a game.

There's also the possibility of cat hair getting inside and interfering
with the air circulation.

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