Microwave Data Systems MDS 4310 Installation, Operation & Field Maintenance page 66

Switch Functions
Listed below are the functions of the two toggle switches referred to in Figure 4-1. These
functions are called for in many of the test procedures which follow.
• Closing SW1 keys the transmitter by setting the RTS line high.
• SW1 must be closed in order for SW2 to emulate transmit data (TXD). Transmit data
is emulated as follows:
Closing SW2 emulates a "Space" condition.
Opening SW2 emulates a "Mark" condition.
REMOTE MAINTENANCE CONSIDERATIONS
General
If your radio is equipped with a Remote Maintenance Module (P/N 05-1958A01 installed in
Jacks J5/J7), some of the tests and alignments which follow must be done using software
commands from the Hand-Held Terminal (HHT) and not with the on-board adjustments.
The HHT icon shown below indicates that the paragraph to its immediate right describes an
action to be taken on transceivers equipped with Remote Maintenance.
The description given below is an example only, and is one of many descriptions of this type
in this manual. HHT programming and control commands are shown in uppercase
Table 3-2 contains a complete list of HHT programming and control commands.
TYPE.
Use the
R
M
To perform the tests in this chapter, operators must be familiar
with connecting the HHT, opening and closing the Diagnostics
Channel and issuing the required commands. Chapter 3—
Programming and Diagnostics contains complete instructions
for using the HHT.
Presettings
The Remote Maintenance Module has three electronic potentiometers (EEPOTs) that are
electrically in parallel with the frequency, deviation and RF power potentiometers on the
transceiver motherboard. Before any alignment of the transceiver is started, the EEPOTs
must be preset to their initial settings (50%) using the
three potentiometers on the transceiver motherboard must then be preset to the positions
listed in Table 4-1.
After the potentiometers on the motherboard are preset, you should adjust the transmitter's
output power (using the HHT) according to the instructions given in Test Procedure
should then proceed with the required test procedures listed in Table 4-2.
The settings of the EEPOTs can be checked at any time by
entering the
displays the settings of all three EEPOTs on one screen.
MDS 05-2415A01, Rev. A
command to read the serial number assigned to the transceiver.
SER
NOTE
NOTE
command on the HHT keypad. The HHT
RMRD
FIELD TESTS & ADJUSTMENTS
command from the HHT. The
RMIS
BOLD
. You
4-5