wrote in message
...
Can someone advise on problems with an Icom ic-718?
Suddenly, I can no long xmit on full power. I can get it put out maybe
40W according to the built-in meter and according to my tuner. Also,
when tuning the tuner in xmit mode, there is a hum that gets loud or
soft depending on the tunning - coming from the xmitter. Is it
possible that one of the two 2SC2904's in the PA unit has blown?
Help / advice is appreciated.

Doug has made some valid suggestions but another is that RF is getting into
your PSU and causing it to drop out of regulation. The IC718 does not like a
low supply voltage- once it drops less than 13V the 718 tends to reduce
power. (This could explain the "hum".)

There are a couple of other ideas: you aren't trying to measure the PO in AM
are you? The 718 runs about 40W on AM. Also, you've not wound the power down
and had it slip your mind? (Although never would explain the "hum".


--
73
Brian, G8OSN
www.g8osn.org.uk