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

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D-2 APPENDIX D MDS 05-2415A01, Rev. A
NOTE
An alternative to the HHT is a personal computer running a
terminal program, such as PCPLUS™, PROCOMM™,
PCTALK™, etc. connected to the radio’s
INTERFACE
connector. In this case, the program should be set to 1200 bps,
eight data bits, parity-none and one stop bit. The keyboard
must be set with the caps lock key pressed, as the radio
responds only to commands made in uppercase characters.
Remote Maintenance gives remote access for fine adjustment but does not allow adjustment
of these parameters over the entire range of adjustment of which the radio is capable. For
example, Remote Maintenance allows you to correct the operating frequency of a radio that
has drifted away from its specified rating but it does not allow you to change the operating
frequency to a different channel altogether. Nor is Remote Maintenance a substitute for
periodic or demand-based field maintenance and re-alignment. Instead, it is a means of
keeping the radio at optimal performance without having to visit the radio site in person.
MODULE ADJUSTMENTS & CALIBRATION
The Remote Maintenance Module contains two adjustable controls—Loopback TX Audio
Level (R6), and Temperature Setting (R33). Normally, R6 needs adjustment only when the
module is first installed in the radio. R33 is adjusted at the factory. Refer to Chapter 4—
Field Tests and Adjustments, Test Procedure
➏
for alignment instructions.
NOTE
In a properly aligned system, Remote Maintenance provides
valuable information to service personnel, however, it should
not be considered a replacement for calibrated test equipment.
R6
LOOPBACK TX
AUDIO LEVEL
J7 J5
R33
TEMP. SET
Figure D-1. Remote Maintenance Module, P/N 03-1958A01
DETERMINING THE PRESENCE OF A REMOTE MAINTENANCE MODULE
Radios with a Remote Maintenance Module installed at the factory will have a label on the
case’s exterior identifying the unit’s loopback code. The presence of this label indicates that
the Remote Maintenance Module is probably installed. However, it is possible that a Remote
Maintenance Module was installed after the radio was shipped from the factory, or that the
assembly was removed from the radio. Even though it is impossible to confirm the physical
presence of the module from outside the case, it is possible to test its presence through the
use of the HHT or PC terminal.