User Manual

Yellow AGC LED is lit.
AGC LEDs indicate an overdrive condition in the respective
link. Reduce the respective link gain via the Gain Adjust until
the LED goes out. Generally, the opposing link gain should be
adjusted to approximately the same setting. If the LED does
not go out, then the input signal is too strong and should be
attenuated with a 10 dB in-line attenuation pad on the Base or
Service port.
Flashing Red Fault LED
This occurs when there is an extreme overdrive condition and
the AGC range has been exceeded. Reduce gain via the Gain
Adjust and check for strong drive signals on the link. Also see
the section on Antenna Isolation.
Checking DC Voltage
DC Voltage can be checked via the 15-pin test port. Pins 10
and 11 are the DC voltage associated with the AGC circuitry.
There should be at least 1.7 volts to ground-pin 14.
Alternatively, you can plug in the PM800-10 monitor into the
test port and measure the UL AGCV to ground.
Test Point Descriptions
The PM800-10 performance monitor is included and is designed to provide convenient visual
readout. A DC VOM can be used to quickly assess the health of the unit. The repeater provides the
output voltages and the power to operate the PM800-10. The –10 denotes that a 10 foot extension
cable is included with the PM800. A 30-foot extension cable (part #: 103300014900) is also available
for remote mounting or the PM800 can be directly plugged into the 15-pin test port located on the
front plate of the repeater. Should the performance monitor become damaged, contact RFS
customer service at 1-800-321-4700 to order a replacement.
In the following description, the term “pin number” refers to the connector pins in 15 pin Dsub Test
Port on the 48810. Pin numbering starts upper right and proceeds from right to left, top to bottom
when viewed externally. The functions are explained below with details on how the unit is used in
practical applications.
 Pins 1-8: Max sink/source = 15mA, output only. Accidental input max = 6.0 VDC
1. UL LNA Alarm, logic, low=fault
2. DL LNA Alarm, logic, low=fault
3. UL Converter Alarm, logic, low=fault
4. DL Converter Alarm, logic, low=fault
5. UL PA Alarm, logic, low=fault
6. DL PA Alarm, logic, low=fault
7. Temperature Alarm > +85 C, logic, low=fault
8. AGC Alarm, logic, low=fault
Pins 1-6 each refer to a specific module inside the repeater. A low TTL voltage will light the
associated LED, indicating a fault condition with that component. See the Component Location
section to find the associated component’s part number. The faulty component may be removed and
sent in for repair, or a replacement may be ordered.
Pin 7 is a temperature alarm indication that the internal temperature has risen above +85°C. The
48810 series use convection cooling, not fans. It is rated for +55°C ambient. In the event of the
temperature alarm, check to make sure the unit is mounted upright and vertical. There must be
sufficient room below and above the unit to allow airflow to the heat sink.
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