I'll add to this in that I just tested my KPA500 to see what the noise
floor did with it on or off. On an antenna, I noticed absolutely no
change in noise floor on any band 160-6, but just to kill the
atmospheric noise, I connected a dummy load to the output of the KPA500.
Again, absolutely no change in noise floor, either by ear or visually
on the P3 with the KPA500 in operate, standby or power off (normal and
also completely off via back panel switch).
Jim - W0EB
------ Original Message ------
From: "Edward R Cole" <[email protected]>
To: [email protected]
Sent: 1/8/2015 10:41:06 AM
Subject: [Elecraft] KPA500 does not use "EBS", and doesn't have any
associated bias noise
A side note to this topic for RF amplifiers, in general:
I have not heard of this "paper crunch" noise description, before this,
but it's well known with VHF and up operation that one does want to
remove bias during receive on many amplifiers due to "white" noise
being generated. Perhaps this is not detected from HF amplifiers
because sky noise is much higher and it is not heard.
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