Generating Using External Mod In - Ramsey Electronics COM3010 User Manual

2.06.02 Generating Using External MOD IN

GENERATE
Modulation
gain control).
Any level from an external generator between 100mV and 2V peak will be compensated with
the AGC circuit. Remember there are three types of AGC supported by the COM3010. These
three modes are cycled using
until you see the SIN waveform icon for tone mode. The FM field will already be selected
since you cannot enter a tone frequency here, so then enter
Property of Ramsey Electronics, Inc.
To enter a tone mode with 50% of AM modulation, press
Do not reproduce or distribute.
making sure the AGC icon still indicates tone mode.
AGC Mode Name
Icon
Voice AGC
Tone AGC
Digital AGC
TX Level
Seq/Reg
SHIFT, EXT. To enter tone mode, press
Voice AGC: Attack and decay are both fast to track voice levels and
bring them to an acceptable level. Peaks will be limited to the set
modulation.
Tone AGC: The AGC will attack (reduce the level) quickly, but decay
(increase the level) slowly. This allows tone signals to be as steady
as possible in level.
Digital AGC allows attack only, no decay. This prevents
overmodulation at the start of a data stream when sending certain
paging formats. This special mode allows for 4-level paging without
"breathing" of the AGC. Breathing is a term used for AGC that is
adjusting too rapidly.
This mode must be "trained" for two seconds with the source to
stop the AGC from adjusting. Once trained, the AGC turns off.
BASIC OPERATION
The external modulation mode allows
modulation from an external source via the
MOD IN jack. The value you enter for
deviation or % AM is followed exactly, and is
automatically adjusted by the AGC (automatic
3, kHz/mV.
Description
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