Unclassified
General Description
1-2
kHz) to transmit the data stream. Therefore, the maximum available data rate is doubled
(19200 bps instead of 9600 bps).
Digital encryption, supported when the vocoder option is installed, provides privacy for
sensitive applications. The encryption keys are loaded by means of the MKL Key Loader.
An RM500 or RM500R radio set consists of a standard MICOM 3 transceiver tightly
integrated with a 500W RF power amplifier and a 110/220 VAC, 50/60 Hz AC-powered
power supply, all contained within a compact chassis suitable for installation in 19 in.
racks and shelves.
The AC input voltage range (110 and 220 VAC) is automatically switched, allowing
operation in the United States of America as well as in other countries. Internal cooling
fans allow for continuous-duty data transmission and operation over a wide temperatures
range. The radio set features four accessories connectors located on the rear panel to
facilitate the connection of optional accessories.
For operation in multiple-transmitter or split sites, the RM500 and RM500R can be
ordered with an interface for the Pre-Selector/Post-Selector (PPS) (option G65).
NOTE
The G65 option does not include the Pre-Selector/Post-
Selector (PPS) unit, which must be separately ordered.
The RM500/RM500R are very well suited for base station applications, and also support
remote control, using option G422AA (refer to Publication 2072-09682-00 for details)
RM500 and RM500R can be directly connected to a wide range of broadband or tuned
antennas, including whip, dipole, traveling wave, delta, and semi-delta antennas. To obtain
maximum forward power, a low VSWR antenna system should be used; however, in case
of excessive VSWR, protection circuits prevent damage by reducing the transmit power to
safe values. Thus, the RM500 and RM500R will always attempt to transmit at the
maximum safe power, even in case of mismatch.
Special circuits protect the RM500 and RM500R against overheating and various types of
malfunctions. In case a critical problem is detected, the protection circuits are activated
and bypass the internal 500W power amplifier: in this case, the MICOM 3 transceiver is
directly connected to the antenna. This enables normal reception, as well as transmission,
albeit at the lower power levels (up to 125W) the MICOM 3 transceiver can provide.
Front panel indicators indicate the type of problem that has been detected, to help the
operator correct it.
Because the RM500 and RM500R are part of the MICOM 3 line, they have similar
capabilities, characteristics and operational procedures as MICOM 3, thereby enabling
personnel familiar with the operation of MICOM 3 equipment to start using the
RM500/RM500R with minimal training.
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