Instruction Sheet
30275
-
001 Rev. L
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.
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.
Element Stiffener
Figure 1: Director Assembly Detail
Model J275D
-
(specified channels)
14
-
27
28
-
35
36
-
42
43
-
50
51
-
60
FREQ. RANGE (in MHz)
470
-
550
550
-
600
600
-
650
650
-
700
700
-
750
GAIN
12dB
IMPEDANCE
75
-
OHM
FRONT
-
TO
-
BACK RATIO
20dB
DIRECTOR ELEMENT LENGTH
(in inches)
5.5 to 8.5, dependent upon frequency
WINDLOAD
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
TURNING RADIUS
44 inches
AVG. SHPG. WGT.
7 pounds
SPECIFICATIONS
(P) 519.756.7157
www.wadeantenna.com
ALWAYS INSTALL WITH
FITTING UP & OPEN
SIDE OF LOOP DOWN
