3M C1060 Manual page 25

Wireless Intercom Systems
Technical Bulletin 10/14/03
New Wireless Base Station
We have introduced a new 3M™ Wireless Base Station, Model C922AA, stock number 78-9236-
6826-9, beginning with serial number 0922001001, produced after approximately late-September
2003. This replaces the 3M™ Base Station, Model C921BA, stock number 78-9236-6491-2, and will
be shipped with all future wireless intercom system orders. The new 3M™ Wireless Base Station,
Model C922AA has the following improvements:
• A redesigned antenna and receiver circuitry. This allows base stations to be mounted as close
as two feet apart without cross-channel interference. This will simplify Dual-Lane and Cross-
Lane installations.
• A new "SWT THLD" jumper J10. This jumper is functional only with jumper J5 set to Full-
Duplex mode. It is designed to stabilize inbound audio volume from the menu microphone
only when using a C1060 headset while operating in Talk Lock mode. This issue generally
does not occur if operating without Talk Lock. It is labeled "HIGH - NRML".
HIGH – Set this jumper to HIGH when using a C1060 headset, and ONLY if you experience
reduced volume from the menu microphone during use with Talk Lock. With the left 2 pins
jumpered, the menu microphone dynamic gain circuit will operate at a higher threshold, which
is compatible with the C1060 headset.
NRML – Set this jumper to NRML for headsets other than the C1060.
jumpered, the menu microphone dynamic gain circuit will operate at the normal threshold, which is
compatible with C960, C960SL, C860, C1025 headsets.
3M Wireless Base Stations beginning with serial number 0921012545, produced after
approximately November 2002 have a redesigned "TALK MON LVL" jumper J9. This jumper
was previously labeled "REDUCE - NONE". It is now labeled "REDUCE - FULL".
REDUCE - With the left 2 pins jumpered, the monitor speaker volume will be reduced 16 dB
when the Talk button is pressed.
Note - This includes the time Talk-Lock operation is activated.
FULL - With the right 2 pins jumpered, the monitor speaker volume will not be affected.
Note - This setting may cause feedback if the headset is operated near the monitor speaker.
3M Commercial Care Division
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St. Paul, MN 55144-1000 © 3M 2003
With the right 2 pins
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