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AM-10HD / Aug 2008
A M - 1 0 H D G U I
be “made up” afterwards in order to return it to a normal level. This is why the
Makeup Gain control has such a wide range.
L‑R Trim – The L‑R trim list box below the Makeup control only appears when
the AM TX menu’s Output Mode control is in the Stereo or Stereo MS position.
When available, it allows a trim adjustment for the output of the Difference, or
L‑R, channel, and may be adjusted +/‑6.0dB referenced to the Makeup setting.
Example: If the Makeup control is set to +30.0dB and L‑R trim is set to ‑3.0dB,
the difference channel is then scaled downward to +27.0dB, or 3dB below the
sum channel.
AGC/Comp Buttons
These buttons determine the presence of the AGC section and the Compres‑
sor section in the output.
AGC Button
– When illuminated by clicking on it, indicates that the output
of the AGC section is in the audio path.
Comp Button
– When illuminated by clicking on it, indicates that the
output of the Compressor section is in the audio path.
Compressor Out / AGC Out – When both AGC and Compressor are switched
off, signal is being bypassed around the Compressor and AGC sections with no
gain control being performed.
Compressor In / AGC Out – Signal is being routed through the Compres‑
sor only, which operates with relatively fast time constants. The sound of the
processing will be quite obvious on most program material.
Compressor Out / AGC In – Signal is being routed through the AGC only,
which operates with relatively slow time constants. The sound of the processing
will be quite invisible on most program material but very short term variations
in level will not be corrected.
Compressor In / AGC In – Signal is being routed through the AGC and
Compressor, which together operate with different time constants. The sound of
the processing will be quite smooth with both short and long term variations in
level being corrected (also see AGC Backoff).
