MY 4 year old alpha 87A amp has developed the ability to produce RFI which
radiates into the air. I can receive the real raspy signal on a handheld
battery powered SW rcvr set to SSB 100 feet away. The signal occurs all across
the band on any band. For the most part it only produces the signal when the
power switch is in the High position. IN the low power position it will spit
and spurt for a few seconds when you go from high to low but then dies out and
does not come back unless you go to high power or actually transmit. It does it
when the amp is in standby or operate mode. NO exciter is required but it does
it during a transmission or standby. It does not affect how the amp works
except you cant hear because of the RFI when not transmitting.
The sound I hear is commensurate with an arch occurring. I suspect a component
in the power supply area but it is very difficult to trouble shoot this rig
because the computer built in it will hard fault and shut down the amp if you
disconnect components and turn it on.
Anyone ever see this or have any idea what is happening in the 87A or any amp.
. thanks Van
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