Specifications

Cooling
RM500/RM500R units are cooled by internal fans. Air is taken in through the front panel vent, and
discharged toward the rear. Therefore, make sure that sufficient free space is available around the
equipment to enable free air flow.
Do not stack equipment units: leave at least 1U free above and below the RM500/RM500R.
Installation Data
The RM500/RM500R are intended for installation in 19 in. racks. The equipment has front-mounted
brackets for attachment. To provide convenient access during maintenance, the RM500/RM500R
may be installed in a sliding drawer or on slides capable of supporting the equipment weight.
Make sure that sufficient rack space is available for installation of other options, for example, the
1U-high PreSelector/PostSelector (PPS).
The rack must be connected to a reliable, low-resistance grounding system.
Sufficient front and rear clearance is required to permit convenient access to front and rear panels, as
well as for removal and installation of equipment units, connection of cables, and maintenance.
Antenna System
Antenna systems are selected in accordance with the specific communication requirements of each
customer: many HF antenna types are available, each providing different radiation characteristics to
meet different communication requirements. Therefore, the selection and installation of an antenna
system is customer’s responsibility. If necessary, contact Mobat or your local Mobat representative for
additional information.
The antenna system must provide a matched termination at the operating frequency, and must be
capable of handling the maximum power output of the RM500/RM500R.
Antenna Feed System
The antenna feed system comprises any cables, panels and matrices, and any accessories that carry
HF signals between the RM500/RM500R 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 RM500/RM500R. 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 RM500/RM500R, review the installation plan and make the
following checks:
1. Identify the prescribed location of the equipment in the rack or cabinet, and 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.
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