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For operation without ап amplifier, the
default setting is OFF.
See sections 3.5
and 3.15 for details.
1.5.7.
EXTERNAL T/R
The EXT
T/R connector provides for
keying
a
non-QSK
external
linear
amplifier.
This connection does not use
a relay. Itis an open-collector transistor
switch rated for a maximum of +24 volts
and 200 mA at the amplifier key line.
Do not connect EXT T/R to a circuit
that will impose higher voltage, higher
current or negative polarity.
Please see section 3.15 of this manual
for more information on connecting an
amplifier.
1.5.9.
AUXILIARY +13.5V
These
two
phono
connectors
provide
135
VDC
power
for
connecting
accessory
equipment.
They
аге
in
parallel.
The
maximum
current
available for both jacks combined is 2
amperes.
1,5,9.
REMOTE
The REMOTE jack is for connection of
the optional Model 3027 (or 302) remote
encoder/keypad via its included cable.
The difference between the two models
is only the paint color.
1.5.10.
SERIAL INTERFACE
The SERIAL INTERFACE provides for
connection of JUPITER to a COM port
on
your
personal
computer,
via
а
standard 9-pin serial port cable.
This
connection allows electronic updates of
1-4
the firmware in JUPITER's flash ROM,
and operation in the Pegasus Emulation
Mode of remote control.
Chapter 3,
paragraph
3.18
describes
optional
operation by computer control.
1.5.11,
SPARE
This phono connector has no connection
as supplied from the factory, and is
available for custom applications.
1.5.12. ACC ~ 2 JACK
This connector is for future use.
1.5.13.
AMPLIFIER DUTY CYCLE
JUPITER has a thermostat sensor on the
Power
Amplifier
module
that
disconnects DC power from the entire
transceiver
when
the
heat
sink
temperature
exceeds
85°C
(about
18092). The transceiver will not power
on until the heat sink cools to 80°С
(about 170°F).
Our testing has established that the heat
sink temperature will reach 85°C after
approximately 15 minutes of continuous
transmitting at 100 watts output without
a cooling fan.
The time to shutdown
will vary with band and load impedance.
We recommend that you always employ
a cooling fan to blow air across the heat
sink when operating key down digital
modes
such
as
RTTY,
PSK31,
and
SSTV.
74269 Second Printing
Model 538 JUPITER
30 August, 2001
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