Rear Panel Description, continued 11
6) DC INPUT -
This connector is used for powering the
TR270 from an external DC source such as a car battery.
Observe proper polarity when wiring the mating con-
nector. This input is UNFUSED and thus requires an
external (10 Amp, FAST BLOW) fuse to be wired in series
with the external wiring supplying this connector. The
transceiver will operate with a DC input voltage of 11-16
VDC. Full high power RF output during transmit is insured
with a nominal supply voltage of 13.6 VDC or higher.
7) AC Power Cord Receptacle -
This receptacle accepts
a three-wire power cable. When the cable is con-
nected to an appropriate power line outlet, the instru-
ment is grounded. The unit is factory set and fused for
operation on a nominal 115 VAC, 50/60 Hz mains supply
and is shipped with a cord assembly intended for 115
VAC mains supply. Be certain of the mains supply
voltage prior to connecting this unit. For operation of
this unit on a nominal 230 VAC mains supply, refer to the
SAFETY/VOLTAGE SELECTION section in this manual for
internal connections and fusing value. Also use the
proper cable assembly approved by your local codes
for operation of this unit on nominal 230 VAC mains
supplies.
8) AC Line FUSE -
This unit is factory set for operation on
nominal 115 VAC mains supply and a 3A, 250 V, SLO-BLO
(5 x 20 mm) fuse is installed. For operation of this unit on
a nominal 230 VAC mains supply, refer to the SAFETY/
VOLTAGE SELECTION section of this manual for internal
connections and fusing value.
9) External Speaker -
This connector accepts a standard
1/8" diameter, 2-circuit, (monaural) phone plug for
connection of an 8-Ohm external speaker. Inserting the
phone plug into this connector switches off the internal
speaker.