Equipment Interconnections; Safety Interlock Switch; Driving Power - QRO Technologies HF-2000 Instruction Manual

as described above.

EQUIPMENT INTERCONNECTIONS

Interconnection between the Amplifier and a typical transceiver is shown in the "Interconnection
Diagram" located inside your tranceiver owners manual. Many brands of equipment usually follow
the same general pattern. Please refer to this diagram plus the amplifier's Rear Panel Pictorial
while reading the following:
RF IN Connect this socket to the RF output connector of your transceiver.
RF OUT Connect this socket to the cable coming from your antenna.
Note: Use shielded cable, such as audio-type cable, for the following connections.
KEY XMT Connect this socket to the Relay socket or keying contact on your transceiver. This
connector requires contacts that are normally open in the receive mode and closed in the transmit
mode. This contact sinks +12 VDC to ground at 80 mA.
+15 V XMT If your transceiver has a provision for +15 VDC on transmit for keying external
devices, such as linear amplifiers, connect this socket to the appropriate socket on your
transceiver. This provision requires factory activation at the time of shipment.
Note: If your transceiver has neither of the above keying methods, you will have to use some
other means. For instance, you could use a shorted RCA phono plug by placing it in the Key XMT
socket. Then, you would have to manually turn off and on the Operate/Standby switch located on
the front panel.
ALC OUTPUT Connect this socket to the ALC input of your transceiver. A 0 to 20 V negative ALC
voltage is present at this socket. Refer to your transceiver manual for proper connection
information. Whenever the Amplifier is overdriven, the ALC circuitry creates a negative voltage
that is fed back to the transceiver to reduce its gain and help prevent "flat-topping".Protective
circuitry of this nature is a valuable circuit element, but it is not a substitute for proper adjustment
of the transceiver drive.

SAFETY INTERLOCK SWITCH

While the Amplifier's top cover is in place, the interlock switch closes to allow AC line voltage to
reach the power transformer. When the top cover is removed, the interlock switch opens and
disconnects the line voltage. This does not discharge the bank of power supply filter capacitors.
Be sure to allow the filter capacitors to discharge before you touch anything inside the Amplifier.
You can select the High Voltage function of the Multimeter to check the high voltage potential.

DRIVING POWER

This Amplifier is designed to operate at full ratings when it is driven by a transceiver that has
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