2. Touch tests: Fuses, fuse holders, resistors and transformers that are too hot indicate possible trouble
spots. Such tests are quick and should be used often.
3. Status display interpretation: Simulation of faults, such as ASO, while observing the display will re-enforce
the understanding of normal operating characteristics. This allows quick troubleshooting of any faults that
may occur.
7.4.5 Antenna System
Periodically conduct inspections of the antenna(s), antenna mounting device(s), cables and connectors. Perform
meter checks to find any open or shorted lines or any high standing wave ratios. Performance checks are
important to ensure that the minute voltages picked up from the transmitter are transferred properly to the
receiver.
7.4.6 Netting
Netting means that the receiver and transmitter of the remote control system are aligned on the same frequency.
It is very important that the receiver is exactly tuned to the frequency required. This check should be done once a
year by a qualified technician.
7.5 Adjustments
During normal system operation, there are no adjustments that need to be made to the receiver/decoder. Nearly
all adjustments to the receiver/decoder are made during system installation. The only setting that may require
adjustment after installation is the squelch adjustment.
Note: The squelch control should be adjusted by Cattron trained personnel only. Tampering with the squelch
could leave the receiver inoperable.
Referring to Figure 18, under normal operating conditions, when a carrier signal at a level just above the squelch
limit of the receiver is detected, the receiver’s green Carrier Detect LED will turn on. If the carrier signal contains
data and a Q-Sync pulse as would be the case if the signal had been transmitted from a Cattron controller, the
receiver’s orange Data LED and yellow Q-Sync LED would also turn on. In actual operation, these three LEDs will
flash rhythmically with each transmission of the controller. This can be easily seen by observing the green
transmit LED on the controller in conjunction with the receiver’s Carrier Detect, Data, and Q-Sync LEDs. They will
flash in unison.
In certain environments the squelch control may require adjustment. If the green Carrier Detect LED is on
continuously, there may be an interfering signal on the selected operating frequency. The first option is to try to
identify and eliminate the source of the interfering signal. If the signal cannot be eliminated, the squelch
adjustment may be sufficient to eliminate the effects of interference.
To adjust the squelch setting, turn on power to the receiver/decoder and turn off power to all controllers. Referring
to Figure 18, while observing the green Carrier Detect LED, slowly rotate the squelch control potentiometer until
the LED just turns off. This will set the receiver to a level where it will mask the interfering signals. Note that
adjusting the squelch level will slightly reduce the receiver’s range. After adjusting the squelch, check the work
area for range of control. Other options that may be affected by adjusting the squelch include the Range Limiter,
Range Extender and Close Start.
Adjustment of the squelch control is limited and may not be sufficient to solve the interference problem. A
frequency change to a clearer channel, or the use of an attenuator to make the receiver less susceptible to
overloading and distortion caused by strong signals on other adjacent channels, may be required. Refer to the
Attenuator section for additional details.
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