Please excuse if this is off topic but if you think it through I think
it could be argued as amplifier related, sort of..
I'm in the process of importing a radio, doesn't matter what but suffice
to say that any radio that enters the country has to be tested at the
government facility by the government 'experts'. Testing consists of
fairly basic checks, power output and frequency coverage are the two
most significant for a transmitter. I have been present when most of my
stuff has been through this process as a lot is tube type of which the
'experts' have little knowledge. In the course of testing the other day
my eyebrow raised when the 'expert' started to measure occupied
bandwidth. I really do understand how this is important in a commercial,
or even, amateur, channelized service but cannot quite get a handle on
why it is would be necessary to determine this for our typical HF type
of operation. Well maybe since it indicates how narrow the signal is and
I suppose could be considered a measure of transmitter cleanliness but
as they were measuring with settings based on 25KHz channel spacing it
seemed a little odd.
I'm interested to hear what 'competent' professionals and others might
have to say about this. I have never seen a specification for this in
any amateur literature.
Regards
Martin, HS0ZED
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