V10/V7.5/V5/V3.5 Installation and Operation Manual
Page
2-23
Section 2 Preparation for Use and Installation
Issue 3.5
2.3.8 Installing RF Feed Coaxial
Cable
Connect an RF feed coaxial cable, which
has been cut to the required length, to the
transmitter’s RF output. The RF feed
cable termination point is located at the
top of the RF power probe (A42) (see
Figure 2-2, 2-8 or 2-9 for location/
dimensional information).
NOTE
The transmitter has an optional EIA
flanged output connection (3-1/8 inch,
1-5/8 inch or 7/8 inch), which is user-
specified. The following procedure applies
to all connector options.
Connect the transmitter's RF output to a
dummy load, if available, during the
commissioning procedure's initial turn-on. If
the RF feed cable is not connected to a
switching circuit that permits antenna/
dummy load selection, ensure the RF feed
cable for the dummy load is connected to
the transmitter's RF output connection until
otherwise specified during the
commissioning procedures.
(a) Verify the RF feed cable is in place
and has been cut to the required
length.
(b) Remove the output cover packing
plate (four M6 screws) from the top of
the transmitter and discard plate.
Retain spacer plates.
(c) In the ancillary crate, locate a bag
labeled “Output Stud Plate”. Install the
stud plate on the RF output, on top of
the existing spacer plate(s). Use the
M6 securing screws removed in
step (b).
(d) Install an EIA flange connector (3-1/8,
1-5/8 or 7/8 inch) on the feed cable.
NOTE
If the RF feed cable’s EIA flange
connector does not have a male
connector for the centre conductor, obtain
an EIA bullet for the EIA flange connector.
(e) Locate and remove six sets of
hardware (nuts, split washers and flat
washers) from the output stud plate
on the top of the transmitter RF output
connector. The size of the hardware
depends on the size of the RF output
connector (3/8 inch hardware for 3-1/8
output; 5/16 hardware for 1-5/8
output; M6 hardware for 7/8 output).
(f) Carefully install the RF feed cable’s
EIA flange connector on the RF power
probe’s flange-mounting studs.
Ensure its bullet mates with the rigidly
mounted cup connector on the RF
power probe. Secure using attaching
hardware removed in step (e). Ensure
nuts are firmly tightened.
2.3.9 Station Reference Ground
Connect a continuous, low-impedance
conductor (minimum four-inch wide copper
strap or equivalent), as described in the
Lightning Protection
section of Nautel’s
Recommendations for Transmitter Site
Preparation
booklet, between the station
reference ground and the insulated
reference ground stud (E1) at the bottom
rear of the cabinet (see Figure 2-2).
NOTE
It is important that this conductor does not
contact the transmitter at any other point.
