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CAUTION
The supply voltage should remain within 10% of the selected
terminal voltage. A lower voltage can cause the internal regulation
circuits to trip and a higher voltage can cause excessive internal
temperatures.
2.3.4.2
RF INput Connector (11)
The
Rec~iver
is shipped with a plastic dust cover over connector
Jl
which must be removed,
before
the
antenna connection can
be
made. ,Ensure that a suitable antenna is selected. 'The input
impedance at the connector is 50 ohms, unbalanced with aVSWR'of 2.1.
2.3.4.3
IF
OUTput Connector
(12)
The, IF Output Connector
12
located on the rear panel is shipped with a plastic dust cover
which must be removed before connection. During operation, a 455 kHz frequency is supplied at
this connector for connection to external equipment. Nominal level is -10 dBm into 50 Ohms.
2.3.4.4
AF
OUTput Connector
(13)
A mating connector (Cannon type DB-25P) with a connector shell is supplied with the
Receiver. Use the following procedure, and pin number/signal designation information in Table 2-3
to wire the connector.
1. Slide the connector shell over the cable to be used.
Solder the cable wires to the connector as required (refer to Table 2-3). The con-
nector pin numbers are indicated on the front of the connector.
3. Slide the connector back into the connector shell. Place one of the spring clips
on top of the connector with the curved edge pointing upwards. Secure the spring
clip and the connector to the connector shell with the self-tapping screw. Repeat
this procedure for
t~e
other side of the connector.
4.
Connect the wired cable to the rear panel connector
13
and secure with two con-
nector springs.
2.3.4.5
Reference Input/Output Connector (17)
TIlls BNC-type connector is used in conjunction with the INT/EXT S2 slide switch to
accept an ex ternal reference source or provide an output of the internally generated reference signal.
The reference frequency may be generated by a temperature controlled crystal oscillator (TCXO)
located on circuit card A8, or by a frequency source external to the receiver. The receiver is nor-
mally shipped from the factory with a preset
1 MHz
reference. Provision is made, however, for
compatibility with
a 5
or
10 MHz
source through internal linkage on the A8, 2nd LO/BFO
Synthesizer Board.
After determining the frequency source compatibility requirements, refer to Table 2-4
and make the following link changes on the A8 circuit board if required.
2-20
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