Mike - I used the supply that came with the R75 and added an LM-350
three terminal regulator right on top of the power supply case with a
"claw" type heatsink. The voltage is regulated at 13 Vdc and the R75
is much cooler.

Frank


Michael Lawson wrote:
wrote in message
ups.com...

Bob Agnew wrote:
Anyone try out this receiver yet? Pros and cons?

Personally it's my favorite receiver. I've had a couple of Drake
R-8s,
two NRD-525s, three FRG-100s and others and definitely prefer the
R75.

Were those 525's using external speakers? I'd figure that
improving the audio on the 525 would give it a big
boost in comparison with the R75.

As for the R-8 vs. the R75, that's been hashed over so
many times I'm not going there.

Mine does have the DSP unit which provides somewhat better S:N under
heavy QRN conditions. I also did the simpler AGC & sync detector
mods
and the AM sync works quite well now. CONS: well, it's really ugly
and
almost impossible to work on since most of the components are the
tiniest surface mount parts. The audio isn't the best but an
external
speaker will help this immensly. The power supply delivers way too
much
voltage which causes the internal regulators in the R75 to run hot,
so
I put a 3-T regulator on the supply that provides a regulated 13
volts
and that cooled things down considerably. I think it normally runs
about 16 volts or so (?).

Frank, did you build your own regulated power supply?
I've seen plans for at least one for the R75 out on the
net.

--Mike L.