Whip Antenna Length
For optimum antenna efficiency, the wire whip may be cut to length. Do NOT try to cut
the whip with wire cutters, the whip is made from tough steel and will likely destroy the
wire cutters. Use a bench grinder or equivalent to grind through the whip wire, being
careful to use protective goggles and heavy gloves while grinding operation. The
chart below lists the length required for various operating frequencies. The lengths
shown are for the exposed portion of the whip. The actual cut length will be 0.175"
(0.45 cm) longer. In addition, the values differ from the theoretical quarter wave length
due to the loading effects of the ball on the end of the whip and the connector barrel.
Approximate length of whip versus frequency:
170 MHz 17.8" (45.2 cm)
180 MHz 17.1" (43.4 cm)
190 MHz16.3"(41.4 cm)
200 MHz15.6"(39.6 cm)
210 MHz 15.0" (38.1 cm)
For frequencies between the chart entries, the length may be interpolated.
XLR Connector
Connect the system's audio source to the XLR connector located on the rear panel.
This is a balanced, transformer-isolated input, which is dc isolated to 50 volts. For the
standard mic-or line-level input modes, the pin assignments on this connector are: pin
1: shield, pin 2: audio positive, pin 3: audio negative.
When internally programmed for use with a Clear-Com or RTS intercom, the pin
assignments will be consistent with that required by the intercom system. The
programming jumpers are located inside the unit at the rear of the PCB, near the XLR
connector. Programming is as follows:
Mode
JP1
JP2
Balanced mic line
BAL
BAL
Clear-Com
XLR 3
XLR 1
RTS Channel
XLR 2
XLR 1
RTS Channel
XLR 3
XLR 1
70 Volt Live
70 V
70V
When reprogrammed, plug the wall-type power supply into a standard power outlet,
and insert the dc power connector into the power jack located on the rear panel of the
RMT-10.
Power Supply
WARNING: If providing dc power from another source, external fusing is
strongly advised. No internal circuit fuse is provided with the RMT-10. The provided
power supply is internally impedance- and thermal-limited and therefore does not
require additional circuit protection. Consult the Vega factory for more information.
You may wish to supply dc power from a source other than the provided wall-mounted
power supply. In this case, c12 to +20 Vdc (0.3 A minimum) to the power
connector on the rear of the RMT-10. A compatible mating connector is the
Switchcraft 760. When connecting external dc, carefully observe the following polarity
rules:
6
Vega RMT-10