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INSTALLATION.
CAUT.ION
Never remoye the cabinet or bottom plate when
power line voltage is
connected.
Highly lethal volt-
age is used in this amplifier. Allow at least one
minute for capacitors to discharge after turning the
amplifier off and pulling the
plug.
GENERAL
(a) Refer to the pictorial in Fig. 3 when making the
installation. Connect a short length of coaxial cable
(RG-58 or RG-8) from the transceiver or exciter to
the coaxial input jack on the 1200-W. A PL-259 type
connector is required at the amplifier end of the
cable.
This cable should be as sh0rt as practical and
preferably not more than 5 feet
long.
(b) Connect the relay control cable to the auxiliary relay
jack on the Swan 270. When using the 1200-W with
other Swan transceivers it will be necessary to per-
form the following steps:
Q)
Remove bottom of transceiver and install
RCA type phono jack on the back of the trans-
ceiver. Be sure to insulate the jack from the
chassis.
@Locate Relay Kl and connect a wire from the
+
12 volt side of the relay coil to the center
conductor of the phono jack.
G)
Connect another wire from the other side of the
relay coil to the common side of the phono
jack
.
@By-pass both terminals of the phono jack with
.0 I mf disc capacitors. (TVI suppression)
@Install phono plug from 1200-W into phono
jack on transceiver for relay control of the
amplifier.
MCK Of 1200-W
IN
OUT
(c) Connect the antenna coax, or dummy load to the
output
jack.
If a low pass filter is to be installed to
reduce TV I, connect it between the output jack and
the
antenna.
(d) For transceivers or exciters other than
Swan,
refer to
the 1200-W schematic for the necessary changes in
the relay circuit. Locate the terminal strip with the
black and red wires from the control cable. They are
located at the rear of the amplifier. These two wires
must be
reversed.
TUNING INSTRUCTIONS
(I)
Turn the 1200-W on. The red light indicates that
power is on and the filaments of the 6LQ6 tubes will
be lit. Turn the 1200-W function switch to the "By-
pass" position. Tune the exciter or transceiver first.
Exciter output will be shunted around the linear
amplifier by the internal relay, and will go to what-
ever antenna or load is connected
.
The "Output
Metering" control will indicate exciter output, and
may be used conveniently as a tuning meter. Simply
adjust the exciter
controls
for maximum output,
using whatever tuning procedure is prescribed for the
particular exciter. Then switch the exciter back to
standby or receive position.
0
Turn the 1200- W function switch to the "Tune"
position. Set the bandswitch to the proper band
position and the P.A. Load to 9 o'clock
.
Turn the
Mic.
Gain down on the exciter (transceiver) and be
sure the carrier has been balanced out. Then switch
the exciter to normal voice-transmit position. With
Swan transceivers this is done by pressing the push-
to-talk button. If the relay control circuitry is prop-
erly connected and functioning, the 1200- W is now in
transmit mode. The 6LQ6 tubes will now be drawing
"idling current" of about 100 rna. By turning the
"Output Metering" control fully counterclockwise to
the off position you will read cathode current.
·
BACk
Of
SWAN
270
ANT.
RG-58
CONTROL CABLE
LO-
PASS TV
FILTER
COAX TO
ANTENNA
FIG. 3 REAR VIEW- TYPICAL INSTALLATION USING SWAN 270
3
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