3M C1060 Manual page 63

4. Listen and Page follow the T(x) button.
Disconnecting the Audio In and Out wires presents some issues if a cook or cashier needs
to monitor both lanes:
a. If the cook or cashier is monitoring lane 1 and the operator is taking an order on lane 2, and
if the operator needs to PAGE the cashier, he/she must first press T1 momentarily then
press PAGE to communicate privately with the cashier. Then the operator can press T2 to
resume taking the order on lane 2.
b. As an alternative, a monitor speaker from each base station may be installed in the kitchen,
or, if the audio wires are still connected to the Cross-Lane Module, only one monitor
speaker. (Caution: Monitor speakers are generally not recommended for Duplex Systems.
The speaker location and volume are usually too critical to avoid feedback.)
2. C960 Radio Interference Discussion
Radio interference is the number one field service problem with most wireless systems today. It is
also the most misdiagnosed. The net effect of interference is reduced operating range.
Symptoms of interference:
• The operating range between the base station and the headsets gets very short, sometimes 25
feet or less.
• Normally, you will hear nothing to indicate interference. Occasionally, you might hear a
whistle in the background, but seldom, if ever, will you hear talking.
• The Talk or Page LED flickers briefly causing one of the following:
1. The system may leave the STANDBY mode, and go into the LISTEN mode with no vehicle
alert heard.
2. The system may drop out of TALK LOCK by itself.
Solutions:
• Change the base station to another channel, at least three channels away. A better solution is to
change the jumper to Lane 2 if possible.
• Locate and shut off other 900 MHz devices in the building, such as cordless phones, video
systems, and speaker systems.
• In cases where a cellular phone tower is nearby, certain combinations of cell frequencies may
cause interference. In some cases, changing channels may have no effect. Please call 3M FST
Communications Products Technical Service (800-328-0033 press 2, 4) in these cases.
3. C960 – 900MHz vs. Licensed Frequencies
Quick Service Restaurants currently use three frequency ranges for wireless intercoms. All require
FCC licensing except for those in the 900 MHz range. Licensed systems offer greater operating range
since their radios emit about 100 milliwatts. However, this power comes at a price:
• These units are typically larger and heavier.
• Batteries typically do not last as long.
• They are noisier.
• They are generally more susceptible to interference.
• They have larger "dead spots".
2