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13.8 V rechargeable battery serving only the RM125/RM125R and charged by its internal
power supply. The charging current is provided to the battery whenever operating from AC,
therefore the battery is kept fully charged. Connecting an external battery has the advantage
that the transceiver can be used even during AC power failure. See battery requirements in
the
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Central 13.8 VDC source available at the base station. This enables using the power
arrangements available on-site, without requiring AC power to be supplied to the transceiver.
In this case, the connection to the DC source must be made through customer-provided series
protection diode with suitable current and surge ratings, and 30 A fuse.
Internal Charger Requirements
The RM125/RM125R can supply charging current to a 13.8 V battery connected to its BAT terminals.
Only 13.8 V lead-gel or lead-acid batteries with a maximum capacity of 45 Ah may be used. The
connection to the DC source must be made through a customer-provided 30 A fuse.
Note that the transceiver draws current from the battery even the transceiver is switched off.
Therefore, it is recommended to disconnect the transceiver from the battery if the radio is not used
for prolonged periods.
Cooling
RM125/RM125R 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 RM125/RM125R.
Installation Data
The RM125/RM125R are intended for installation on desktops or in 19” racks. The equipment has
front-mounted brackets for attachment to the rack. To provide convenient access during
maintenance, the RM125/RM125R 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 Pre-Selector/Post-Selector (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 the manufacturer or your local 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 RM125/RM125R.
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