toggle quoted messageShow quoted text
If you can't find component cooler, get a can of "canned air"
from an office supply store. If you hold the can upside down
you'll get liquid. Alternate between that and a hair dryer to "pin
down" the problem.
On 7/25/19 5:39 PM, Peter GM0EUL wrote:
Thanks, some very useful suggestions. I will check the DC
voltages and I like the idea of using an amplified speaker to
trace the audio and see when it gets noisy. The situation is
complicated at the moment because now its got cooler the radio is
working almost normally, I've just managed three qsos back to back
with no issues, but its been unusable all day. Heat must be a
factor. There is nothing particularly microphonic on the board,
except R35 sometimes buzzes and whooshes when I touch its exposed
end with my finger. Might be worth changing that next, its the
750K resistor you mentioned and its an easy job if I can find
something to replace it with.
I haven't got any freeze spray but it would be useful thing to
It needs to work for another half hour in the morning and I'll
have made the 5 consecutive activity days! Its been totally
reliable up to now but then its never been this hot here before.
All the best