Installation Preparation - Command Technologies COMMANDER VHF-2000 Manual

INSTALLATION PREPARATION

Location of your Commander VHF-1200/2000 requires that no equipment be placed
directly above it, as air expelled from the tube exhaust can become quite hot. Allow at
least 3 inches clearance on either side of the unit between other equipment.
To switch from transmit to receive the Commander VHF-1200/2000 requires a contact
closure or keying circuit capable of sinking 55 ma. of positive voltage (12 VDC. open
circuit) to ground. This connection is made to the RCA jack on the rear panel marked
relay. Read the manual that came with your Transceiver to find the proper external
connections. On some Transceivers, this is not provided, and an alternate circuit will be
required. You can key the unit manually by placing a shorted RCA plug in the relay jack
and using the standby / operate switch on the front panel. Always use shielded cable for
these connections.
The 12 VDC jack on the rear panel is an accessory for powering low current 12 VDC
devices (less than 100 mA.). Do not connect an external voltage source to the jack.
Connect a good quality Thruline Wattmeter between the Amplifier output jack and the
Antenna or Dummy Load using RG8 or better coax.
Connect the Exciter RF output to the Amplifier input using 50 ohm coax.
Connect as short a ground lead as possible from Earth Ground to the units rear panel
ground terminal.