Antenna Feed System
The antenna feed system comprises any cables, panels and matrices, and any accessories that carry
HF signals between the RM125/RM125R and the antenna itself.
All the antenna feed system components, and in particular the feed cable, must have low loss and be
capable of carrying the maximum power output of the RM125/RM125R. Remember that any power
loss along the cable is signal loss!
To protect yourself and the radio equipment against lightning strokes and accidental contact of
antenna and/or feed cable with high voltage lines, a properly grounded coaxial protector must be
installed at the point of entry of the feed cable into the building or communication shelter. The
recommended protector type is IS-B50LN-C0 by PolyPhaser Corp. (also available from Mobat, as Cat.
No. 2072-09128-00).
Preparations for Installation
Before starting the installation of a new RM125/RM125R, review the installation plan and make the
following checks:
1. Identify the prescribed location of the equipment in the rack or cabinet.
2. Check the mounting surface, and the mounting holes. Thoroughly clean the mounting surface
and remove all paint, grease and dirt from the holes to provide a better grounding connection.
3. Check availability of AC and/or DC power, and grounding arrangements.
4. Check antenna installation, in accordance with the antenna installation and operation manual.
5. Check the cable runs between the RM125/RM125R and the prescribed antenna, including the
coaxial protector. Make sure that the cables are securely fastened, and do not show signs of
external damage.
Caution
Before installing the RM125/RM125R on slides, make sure you are
familiar with the procedures needed to install slides in the rack/cabinet,
and to safely install heavy equipment on the slides.
Installation Procedure
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Basic Radio
Preliminary Connections
1. Identify the installation position of the RM125/RM125R in the rack.
2. Install the RM125/RM125R in the prescribed installation position, fastening it by means of four
screws to the rack rails or to the drawer front.
3. Connect grounding straps from each of the two RM125/RM125R grounding screws (located on
its rear panel), to the prescribed cabinet’s grounding bar.
4. Set the AC power switch on the RM125/RM125R front panel to OFF (down position).
5. Turn the ON/OFF and volume control fully counterclockwise, beyond the detent position.
6. Connect cables to the unit as follows:
•
Connect the RM125/RM125R AC power cable to the prescribed outlet on the power
distribution box of the cabinet.
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