Re: FDM-DUO ALC
Klaus Brosche, DK3QN <dk3qn@...>
Might be a bit 'blunt', excuse me for that, but IMHO ALC-feedback
from an Amp into an Exciter/TRX is just about the very last thing
I would consider to make an TRX/Amp combination 'work'.
It's a backward feedback loop with all kinds of implications
I'd rather set the DUOs RF output level such that the Final Amplifier
is running within it's desired linear amplification range/IMD range.
You do not need a high-spec SDR for checking the quality of your
transmitted signal. A simple RTL-stick will do, as long as you'll keep
it's RF input level (monitoring your TRX signal) within the units
You'll then literally 'see' (waterfall) any changes of TRX drive power
into the Amp and what this does to the quality of your transmitted
I have done this kind of 'exercise' on the air with quite a couple of
my local club mates and they all were quite surprised in the end
about what they've sent-out before and after this exercise.
'After' = a non-offensive RF signal transmitted w/o losing any
signal strength at the receivers side.
Am 04.11.2019 um 17:59 schrieb Tony EI8JK:
Thanks for that Iain.