Ten-Tec JUPITER - Page 12

1. INSTALLATION
11. POWER SUPPLY
JUPITER requires a source of well-
filtered and regulated DC voltage. The
supply voltage can range from +12.0 to
+15.0 VDC but +13,8 VDC is optimum
and recommended. Тһе power source
must be capable of 20-ampere peaks. If
you wish to run JUPITER to its full
capability on digital modes, the current
capacity must apply at 100% duty cycle,
and you will need to direct a cooling air
stream (from a fan) at the heat sink.
NOTE: ALWAYS ENABLE THE
POWER SOURCE FIRST AND
THEN THE TRANSCEIVER. IF
THE DC SOURCE IS SUPPORTED
BY A GENERATOR OR
ALTERNATOR, ALWAYS TURN
OFF THE TRANSCEIVER BEFORE
THE EQUIPMENT IS STARTED OR
SHUT OFF, THESE RECHARGING
DEVICES OFTEN GENERATE
LARGE VOLTAGE SPIKES THAT
CAN DAMAGE THE
TRANSCEIVER.
The TEN-TEC Model 963 power supply
is specifically designed for this service.
This supply has built-in overcurrent
protection and all the necessary RF
bypassing.
The 2-pin ОС connector оп the rear panel
of JUPITER is polarized to permit
attaching the mating plug in only the
correct way. Determine the correct
orientation and plug the power cable into
JUPITER. If you plan to use a power
source other than Model 963, we
recommend the pre-assembled DC
power cord (#86095) that we supply
with the 963. Older model Ten-Tec
power supplies with 4-pin connectors
74269 Second Printing
Model 538 JUPITER
30 August, 2001
require the model 306 4-pin to 2 pin adapter.
RED (+)
REGULATED
13.8 VDC,
20 AMP
POWER
SUPPLY
BLACK (-)
Figure 1-1 Power Supply Connections
We have also included two spare connector
pins (#41020) and а connector shell
(#35165) for building your own cord. Be
sure to use no less than 14 gauge stranded
wire for these connections because of the
high current demand on transmit.
12. ANTENNA
The transmitter is protected against damage
from brief load impedance mismatches
ranging from a dead short to an open circuit.
Operation at or near full power is possible
with an unbalanced (coax feed) load
impedance between 25 and 100 ohms
(approximately 2:1 SWR). Antennas with
higher SWR require an external antenna
tuner, as do single wire and balanced
feedline types.
An 50-239 connector on the rear panel
connects the antenna to the transceiver.
1.3. EXTERNAL ЗРЕАКЕК
Note: JUPITER provides a connection for an
ungrounded external speaker. JUPITER’s
audio power amplifier IC uses a full-bridge
circuit. This connects the speaker terminals
as a balanced load between two amplifiers
driven in push-pull. While the circuit floats
both sides of the speaker off ground, it
maximizes the undistorted output power
from a single-ended supply.