Microwave Data Systems MDS 4310, Установка, эксплуатация и техническое обслуживание на месте

Страница: 69 / 129

4-8 FIELD TESTS & ADJUSTMENTS MDS 05-2415A01, Rev. A
Transmitter Power Output Check
1. Connect a directional wattmeter between the transceiver and the antenna feedline.
2. Connect the HHT to the transceiver and open the Diagnostics Channel.
3. Key the transmitter by entering
KEY
. This command keys the transmitter until the
DKEY
command is entered (or until the time-out period has been reached).
4. Check the output power of the transceiver. If necessary, adjust it for the desired
level, or a maximum of 5 watts, using R69 on the transceiver motherboard. Do not
exceed 5 watts.
R
M
If Remote Maintenance is installed, set R69 fully clockwise and use the
IP
/
DP
/
INCP
/
DECP
commands to adjust the output power. The
IP / DP
commands increment/decrement the power in single steps while the
INCP /
DECP
commands make larger jumps by adding a space and a number to the
command. (Example:
INCP_20
+
ENTER
to increase the power by 20 steps
out of 100). When finished, type
RMST
to store the setting.
CAUTION
In systems operating with battery power, make sure that the
battery is fully charged before attempting to set the
transceiver output power. If the power is set for 5 watts with
reduced battery voltage, the transceiver will put out more
power when the battery becomes fully charged, which may
cause a violation of FCC rules and drain the battery more
quickly than expected.
Antenna VSWR Check
1. Connect a directional wattmeter between the transceiver and the antenna feedline.
2. Key the transmitter by entering
KEY
. This command keys the transmitter until the
DKEY
command is entered (or until the time-out period has been reached).
3. With the transmitter keyed, set the directional wattmeter to measure the power in the
reverse direction, to measure the reflected power from the antenna. This should read
less than 0.5 watt. If the reading is higher, problems with the antenna or feedline are
indicated. Check all connections and ensure that the cable connectors are installed
properly. Make sure the antenna is not damaged, and is the correct model for this
frequency band.
CAUTION
Do not put the radio into service until reflected power prob-
lems are corrected, as they can degrade system performance
and shorten equipment life.