WADE Antenna, Inc. J275D-*-K Instruction Sheet

J-SERIES
UHF MATV ANTENNAS
MODEL: J275D-*-K
Description:
J-Series UHF antennas are heavy duty, 75-ohm units, specifically
designed for master antenna (MATV) systems. The unique dia-
mond loop driver provides both horizontal and vertical directivity
with excellent impedance and true coaxial match across the UHF
range. The vertically spaced reflectors maintain high front to back
ratios across the band. The 13 directors, which are cut to one of
seven sub-bands, offer high gain and Yagi-like performance char-
acteristics.
Each antenna has a 75-ohm threaded 'F' type output connector
and is supplied with all necessary installation hardware, one Jer-
rold Model F-659 (pat, pen.) universal coaxial connector and one
Model WB-61 weatherboot with sealing ring.
Installation
Material and Tools Required:
It is assumed that a sturdy, properly grounded mast of up to two
inches in diameter is already in place.
1. Sufficient 75-ohm coaxial cable such as RG-59/U, Jerrold CAC or
RG-6/U , for preparing a down-lead
NOTE: Where the down-lead run is long, RG-59/U cable may incur
excessive losses in the UHF band. Jerrold CAC or RG-6/U cable is
therefore recommended.
2. One additional Jerrold Model F-659 adjustable fitting.
3. A 7/16 inch nut-driver.
4. A 1/2 inch nut-driver or wrench.
5. A 7/16 inch open-end wrench.
6. Cable preparation tools: a ruler with a 1/16 inch divisions; a pair
of wire-cutters; a small file; a Jerrold Model PL-659 crimping tool.
Model J275D-
(specified channels)
FREQ. RANGE (in MHz)
GAIN
IMPEDANCE
FRONT-TO-BACK RATIO
DIRECTOR ELEMENT LENGTH
(in inches)
WINDLOAD
TURNING RADIUS
AVG. SHPG. WGT.
Please Note: A qualified structural engineer
should be consulted prior to mounting an
Assembly and Mounting:
1. Tap the end-plugs onto the ends of the tubular director ele-
ments, if desired, and assemble the elements to the crossarm us-
ing a single long hex-bolt as shown in Figure 1. Do not over tight-
en the hex bolts
2. Loosely assembly the dual 'U' bolt mounting bracket onto the
crossarm as shown in figure 2.
SPECIFICATIONS
14-27 28-35
470-550 550-600
5.5 to 8.5, dependent upon frequency
85 mph: w/ 1/4 Inch radial ice = 52lbs: w/ no ice = 34lbs
100 mph: w/ 1/4 Inch radial ice = 71lbs; w/ no ice = 46lbs
ALWAYS INSTALL WITH
FITTING UP & OPEN
SIDE OF LOOP DOWN
Figure 1: Director Assembly Detail
36-42 43-50
600-650 650-700
12dB
75-OHM
20dB
44 inches
7 pounds
Instruction Sheet
30275-001 Rev. L
Element Stiffener
51-60
700-750
(P) 519.756.7157
www.wadeantenna.com