On Tue, 11 Dec 2012 01:11:53 -0000, kf5rgb wrote:
OK maybe I'm not understanding the ALC adjustment and the power meter correctly.
I can adjust the transmit level on the soundcard to the lowest setting in DM780
and I see just a hint of ALC on the ALC meter, but when I do that I see no
movement at all on the power meter. Adjusting the transmit level up a little
bit where I see something on the ALC meter I begin to see the power meter go
up. Shouldn't the power meter correspond to the RF power I have the radio set
at or am I confused?
The simplest way to think of ALC is as a limiter. The harder you drive the
transmitter, the higher the ALC should read. If you increase the audio input
from zero slowly, the power should go up with no ALC at all until it reaches a
certain point. At that point, the ALC should go up and the power should stay
the same. PSK should run very low power, half or less of your full power
setting, with no ALC showing. Turn the power all the way up (100W), slowly
increase the audio from the sound card to the transmitter input until you show
35-45 watts, or less. There should be no ALC at that point. THIS ALL ASSUMES
YOU HAVE A PERFECT MATCH - little or no reflected power. This procedure goes
for any normal SSB transmitter.
Gary
--
Web:
NodeOp Page:
Node 3055:
