RF Concepts LLC PA-77DF 用户手册
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DOCNUMBER 9500
Document Issue 1.1
February 2010
February 2010
Page 4–9
RF Concepts, LLC
Alpha 9500 Linear Amplifier User Manual
Product Release 1
Setting Up the Amplifier
Step 4
Place the amplifier in its operating position on a stable surface with
sufficient space to the rear, sides, and top to allow good air flow and safe
placement of cables.
sufficient space to the rear, sides, and top to allow good air flow and safe
placement of cables.
Step 5
Connect the amplifier RF INPUT to the transceiver RF OUTPUT.
Use 50-ohm coaxial cable-RG-58C/U or equivalent.
Step 6
Connect the amplifier RF OUTPUT to the antenna or appropriate
matching device.
matching device.
Use RG-8A/U, RG-213/U, or equivalent high-quality cable with a PL-259
UHF-type plug on the amplifier end. Do not use RG8X cable, because it
is not rated for 1500 W.
UHF-type plug on the amplifier end. Do not use RG8X cable, because it
is not rated for 1500 W.
Step 7
Connect the transceiver (T/R) control cable to the amplifier’s KEY IN
input.
input.
The amplifier has a full break-in vacuum relay QSK system that requires
only the normal interconnection when used with a modern QSK
transceiver. The amplifier requires a contact closure (short circuit) on
transmit from the transceiver’s RELAY jack center pin to the chassis.
This function is supplied by the transceiver, usually from a dedicated
relay that is normally open in receive and closed in transmit.
only the normal interconnection when used with a modern QSK
transceiver. The amplifier requires a contact closure (short circuit) on
transmit from the transceiver’s RELAY jack center pin to the chassis.
This function is supplied by the transceiver, usually from a dedicated
relay that is normally open in receive and closed in transmit.
7a
Use shielded wire for the T/R control cable. Fit the amplifier end with
a common phono (RCA-type) plug and the transceiver end with a
suitable connector.
a common phono (RCA-type) plug and the transceiver end with a
suitable connector.
7b
Ensure that the T/R relay contact closes. Protection circuitry prevents
hot-switching when RF drive is applied. Modern transceivers have
the proper time delay between key-up and the start of the transmitted
signal to allow the amplifier to follow the CW keying.
hot-switching when RF drive is applied. Modern transceivers have
the proper time delay between key-up and the start of the transmitted
signal to allow the amplifier to follow the CW keying.
If you suspect a T/R timing problem:
1.
Connect the CW keyer to the amplifier’s KEY IN input.
2.
Connect a cable from KEY OUT on the amplifier to the keying
input of the transmitter.
input of the transmitter.
3.
Ground the key cable (they should key up).
4.
Apply power from the transmitter. The amplifier should respond
with power out to the antenna.
with power out to the antenna.
NOTE: The amplifier does not generate or use Automatic Level
Control (ALC) voltages to control an exciter.
Control (ALC) voltages to control an exciter.