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R8B and external power supply

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February 2nd 05, 03:50 PM

dxAce

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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!

I've never run my R8 or R8B off of an external supply (at least here at home). I
do run the R7 off of one due to one earlier occasion of blowing some diodes in
the internal supply, so just for the heck of it I run my current one off of a 12
volt supply.

The R8 and R8B never run very hot.

dxAce
Michigan
USA

http://www.iserv.net/~n8kdv/dxpage.htm

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