Input/Output Connectors; Voltage Selector/Fuse Block And Line Cord Receptacle (Fl1J1); Rf Input (A2J1); Line/Phone Audio Out (J16) - Watkins-Johnson Company WJ-8718-19/FE Instruction Manual

INSTALLATION AND OPERATION WJ-8718-19/FE HF RECEIVER
2.3.1 INPUT/OUTPUT CONNECTORS
The receiver's input/output connectors .are shown in Figure 2-1. These
connectors are physically mounted on the receiver rear panel. These connectors are
described individually in the following paragraphs.
2.3.1.1 Voltage Selector/Fuse Block and Line Cord Receptacle (FL1J1)
This assembly should be inspected before installing the receiver in a new
location. With the line cord unplugged, the clear plastic window can be slid over the
three male power receptacle prongs. This exposes the line fuse and a hinged, plastic
FUSE PULL lever.
Swinging of the FUSE PULL lever to the left ejects the fuse from the
holder and frees a line-voltage-select PC wafer found at the bottom of the assembly.
Looking down on the PC wafer at a slight angle on the left side shows the selected
line voltage for the receiver, either 100, 120, 220, or 240 Vac. If the voltage shown
does not match the available line voltage, remove the PC wafer and reinstall it so
that the line voltage visible with the PC wafer in position most closely matches the
line voltage used. Then install the fuse suitable for the line voltage: 1 A, slow-blow
for 100 Vac and 120 Vac, or 1/2 A, slow-blow for 220 Vac and 240 Vac. Install the
other fuse in the alternate fuseholder.
Slide the cl?ar plastic window back over the fuse and PC wafer portion of
the assembly holder and insert the line cord in the receptacle.
2.3.1.2 RF Input (A2J1)
This BNC connector is the RF signal input for the receiver. Nominal input
impedance is 50 ohms. The input is protected against signals exceeding +15 dBm
(1.25 V rms) and static build-up.
2.3.1.3 Line/Phone Audio Out (J16)
This 9-pin circular connector provides line audio and phone audio outputs.
The line audio output drives a balanced 600 ohm load. Output level is from 0 vac to
a maximum of 24.5 Vac (+30 dBm) as determined by the setting of the rear panel LINE
AUDIO LEVEL potentiometer. The phone audio output drives an unbalanced 600 ohm
load. Output level is from a minimum of 0 Vac to a maximum of 4.2 Vac (+15 dBm)
as determined by the setting of the front panel PHONE LEVEL potentiometer. The
pin assignments are as follows:
2-2