Bell System KS-15676 Installation Manual

BELL SYSTEM PRACTICES
Plant Series
SECTION 402-421-207
Issue 1, April, 1958
AT8TC0 Standard
1.
2,
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1.
MICROWAVE ANTENNAS
KS-1 5676 HORN-REFLECTOR AND WAVEGUIDE SYSTEM
INSTALLATION
ORIENTATION USING 11A DIRECTIONAL COUPLER
CONTENTS
PAGE
GENERAL . . . . . . . . . . .
CONNECTION AND ALIGNMENT OF
COMPONENTS AND WAVEGUIDE TEST
EQUIPMENT . . . . . . . . . .
TEST SETUP AT TRANSMITTING
STATION . . . . . . . . . . .
TEST SETUP AT RECEIVING STATION . .
ANTENNA ORIENTATION . . . . . .
CHECK BETWEEN MEASURED RECEIVED
SIGNAL POWER AND THEORETICAL
RECEIVED POWER . . . . . . . .
FLEXIBLE-WAVEGUIDE INSTALLATION
AND CROSS-POLARIZATION CHECK . .
NEAR-END CROSSTALK BALANCE
TEST . . . . . . . . . . . .
GENERAL
1
2
5
6
6
?0
13
15
1.01
This section describes the orientation of
KS-15676 antenna and associated wave-
guide assemblies using the 11A directional
coupler.
1.02 The horn-reflector antenna is used for
either single-polarity or 2-Po1arit y trans-
mission of the radio waves. Single-polarity sys-
tems require separate antennas for transmitting
and receiving. The 2-polarity system uses the
same antenna for transmitting to and receiving
from an adjacent radio repeater. This practice
describes antenna and waveguide alignment for
2-polarity systems and includes additional trans-
mission tests of the 11A directional coupler.
Caution: The horn-reflector antenna has a
weather cover which is expanded bg the nor-
mal pres8ure from the station drg-air
8Up-
plg. The
cover
must be under pressure from
this supplg during the transmission testing
and level measurements. To avoid delags,
all waveguide changes are made on the un-
pressurized side of the pressure window.
Note 1:
Fig. 5 shows the steps to follow in
orienting antennas and waveguide compo-
nents. The exact procedure, using 4-kmc test
signals, is detailed in the following text:
(a) Do not attempt to orient the antennas
during fading periods greater than 1 db.
(b) At the rotational flanges employing an
O ring gasket, which are used during
orientation alignment, the application
of a small amount of petroleum jel 1 y is
recommended to facilitate a smooth ac-
tion. Care should be exercised to avoid
any application of the jelly on the in-
side of the waveguide.
Note
2: The transmitting and receiving
equipment at each station shall have passed
all acceptance tests before it is used for
orienting.
1.03
The following tools and apparatus are
required at each repeater station:
OUANTIN DESCRIPTION
2 ED-5941O-7O Transducers
2 KS-5783, L4 Flexible Waveguides
1 ED-59449-70 Azimuth Scale
1 KS-15676, L12 Azimuth Adjusting
Screw
1 P-38B664 Circular-waveguide Wrench
1
P-38B665 Rectangular-waveguide
Wrench
1 J68340A, L3 or L4 Test Bay or
J68345A, L1 or L2 Test Set
1 KS-15658 Noise-Figure Test Set
1
J68340N or J68340E Power Meter
(J68345A Test Set applications only)
@ American Telephone and Telegraph
Company,
1958
Printed in U.S.A.
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