•
Set the digital voltmeter (dvm) to read in a range of 5A
or greater and put its test leads in series between positive
lead from battery system A and terminal 2 (+) of TB-1 on
the repeater (Figures 2.8, 2.9). After the current stabilized
in half a minutes, the current should be within the limits
as shown in Table 7.2. Log all voltage and current readings
in Table 8.1 for reference during routine mainte-nance or
trouble location procedures.
Table 7.2
Current Requirement with One Power
Supply On
RF-2000E-01 /EW-11,-14
1.9 ~ 2.0A
RF-2000E-02 /EW-12,-15
3.7 ~ 4.0A
RF-2000E-03 /EW-13,-16
.93 ~ 1.0A
RF-2000E-21 /EW-31,-34
2.2 ~ 2.4A
RF-2000E-22 /EW-32,-35
4.4 ~ 4.8A
RF-2000E-41 /EW-51,-54
2.6 ~ 2.8A
RF-2000E-42 /EW-52,-55
5.2 ~ 5.5A
RF-2000E-43 /EW-53,-56
1.3 ~ 1.4A
•
Repeat the above procedure to measure current from
battery system B and terminal 3 (+) of TB-1 on the repeater.
The current should also be within the limits as shown in
Table 7.2. Log them in Table 8.1.
•
Connect the positive lead from battery system B to terminal
3 (+) of TB-1. Make current measurement from battery system
A to terminal 2 (+) of TB-1. The current reading should be
within the limits as shown in Table 7.3. Log in Table 8.1.
Connect the positive lead from battery system A to terminal 2
(+) of TB-1.
Table 7.3
Current Requirement on One Power
Supply with Both Power Supplies On
RF-2000E-01 /EW-11, -14
1.0A
RF-2000E-02 /EW-12, -15
2.0A
RF-2000E-03 /EW-13, -16
1.0 /0A
RF-2000E-21 /EW-31, -34
1.0 /1.4A
RF-2000E-22 /EW-32, -35
2.0 /2.7A
RF-2000E-41 /EW-51, -54
1.4A
RF-2000E-42 /EW-52, -55
2.8A
RF-2000E-43 /EW-53, -56
1.4 /0A
RF-2000E/EW Repeater
RF-2000E/EW Repeater
Website
www.peninsulaengineering.com
Antenna Isolation Measurement
•
In order to prevent oscillation or se-vere passband distor-
tion, the antenna must have a minimum port-to-port isolation.
Please refer to Appendix A for detail information.
•
Measure the isolation by sending a signal into one of the
antenna feeders and measuring the level of that signal at the
other antenna feeder. The signal power level difference in
dB is the isolation of two antenna.
•
Be aware that the motion of objects near to the antenna
can change the isolation. Tests should be made with any
expected objects present, if possible, to ensure that the isola-
tion does not drop below minimum.
•
Repeat the test at several frequencies across the designated
bandwidth, making sure the minimum isolation is met at
ALL frequencies.
•
If isolation is not met, try repositioning the antenna, or adding
intervening shielding and then measure again.
Antenna Orientation, AGC/ALC set and Output Measurement
•
Before antenna orientation begins, the amplifiers must be
operating in their full gain mode (out of AGC/ALC range).
The setting of the AGC/ALC along with a high input level
(greater than [desired output power level in dBm - 60 dB])
may cause the normal action of the AGC/ALC circuit to
mask changes in power due to azimuth and elevation
sweeping of the antennas. The output power of an amplifier
will increase in level as the input level is increased to the
point where the AGC/ALC has been set (eg. +18 dBm for
16QAM on Power Level 1). Further increases in input level
will be absorbed in the AGC/ALC circuit. To use the
amplifier power monitor point as a signal strength indica-
tor, turn Variable Gain pot counter-clockwise to reduce the
linear gain of the repeater such that the output is below
the desired level. Its AGC/ALC function is disabled now.
If during antenna orientation, the power rises to the desired
power level, turn the Gain Adjustment counter-clockwise
further more to reduce the output level again and then con-
tinue with antenna orientation. Same result can be achieved
by reducing the input level with adding attenuators at the
input of the amplifier.
26