Newtronics G7-144 User manual

Installation Instruction
Model G7-144
Warning
INSTALLATION OF THIS PRODUCT NEAR POWER LINES IS DANGEROUS.
FOR YOUR SAFETY, FOLLOW THE INSTALLATION DIRECTIONS.
ASSEMBLY INSTRUCTIONS
1. Check package contents against illustration to insure all items are included.
2. Refer to Figure 1 and install the four radials. This is accomplished by inserting the four
#4405-1 screws through the #5357 plate and through the #3553-12 radials then two to three
turns into the cast aluminum base. When the radials are properly aligned, tighten down the
screws. Add the yellow caps to the ends of the radials.
3. Assemble the vertical radiator section per illustration
4. Mount the antenna on a 1” to 1 3/4” diameter mast with the u-bolts supplied.
5. Before you attach your cable be sure you have an N type connector on the cable and not PL-
259 connector because the connector on the antenna is an N type.
TUNING INSTRUCTIONS
After the assembly is complete, install a dependable watt meter at or near the feed point of the antenna.
The G7-144 utilizes a 5/8 wave lower, 5/8 middle, 5/8 upper collinear radiator which has been spaced
for optimum low angle radiation.
The dimensions shown in the illustration (47 1/4, 45 and 46 1/2) are for tuning the G7-144 to 146.5 MHz.
To tune the antenna to some other frequency in the band, loosen the clamp of the bottom radiator and
adjust the length until the reflected power of V.S.W.R. is obtained.
Secure this clamp. Loosen the clam of the middle radiator and adjust this length until the lowest possible
reading is obtained.
Repeat the same procedure for the upper radiator.
Secure all hardware and clamps
Before final installation, if desired, coat the entire antenna with the exclusion of the rf connector with a
good grade acrylic lacquer such as “Krylon”.
The total useable bandwidth is more than 2MHz under 1.5:1 without degradation of gain which makes
the antenna idea for duplex operation.
Newtronics Limited Warranty
Newtronics Antenna Corp. warrants its products to be free of defects in material and workmanship and extends this warranty
under intended use and normal service conditions to the original owner for a period of one year from the date of purchase.
This warranty does not apply to any product that has been repaired or altered in any manner and is void for any damage due to
accident, neglect, unreasonable use, improper installation or any other cause not arising out of defects in material or
workmanship. The obligations of Newtronics Antenna Corp. are limited to repairing or replacing, at its option any product or part
that is returned to the factory, all transportation charges prepaid, accompanied by proof of purchase and which examination
reveals to have been defective within the warranty period stated above.
Newtronics Antenna Corp. does not assume, nor is any person authorized to assume for it, any obligation other than that herein
stated.
Any implied warranties, including by not limited to fitness for a particular purpose, are limited in duration for the above one year
period. Newtronics Antenna Corp. shall not be liable under this warranty or any implied warranty, for loss of use of the product
or for other consequential loss of damage incurred by the purchaser.
Some states do not allow the exclusion of limitations of implied warranties of consequential damages and so the above
exclusions of limitations may not apply in those states. This warranty gives you special legal rights and you may have other
rights that vary from state to state.
G7-144
Kit #5907

G7-Series Tuning Chart
Use diagram on back of instruction sheet
Frequency (MHz)
G7-136 136-144 MHz
136
136.5
137
137.5
138
138.5
139
139.5
140
140.5
141
141.5
142
142.5
143
143.5
144
G7-144 143-149 MHz
143
143.5
144
144.5
145
145.5
146
146.5
147
147.5
148
148.5
149
G7-152-1 148-154 MHz
148
148.5
149
149.5
150
150.5
151
151.5
152
152.5
153
153.5
154
“X”
51 3/4
51 1/2
51 1/4
51
50 3/4
50 1/2
50 1/4
50
49 3/4
49 1/2
49 1/4
49
48 3/4
48 1/2
48 1/4
48
47 3/4
48 1/4
48
47 3/4
47 1/2
47 1/4
47
46 3/4
46 1/2
46 1/4
46
45 3/4
45 1/2
45 1/4
47
46 3/4
46 1/2
46 1/4
46
45 3/4
45 1/2
45 1/4
45
44 3/4
44 1/2
44 1/4
44
“Y”
501/2
50 1/4
50
49 3/4
49 1/2
49 1/4
49
48 3/4
48 1/2
48 1/4
48
47 3/4
47 1/2
47 1/4
47
46 3/4
46 1/2
46 3/4
46 1/2
46 1/4
46
45 3/4
45 1/2
45 1/4
45
44 3/4
44 1/2
44 1/4
44
43 3/4
45 5/8
45 3/8
45 1/8
44 7/8
44 5/8
44 3/8
44 1/8
43 7/8
43 5/8
43 3/8
43 1/8
42 7/8
42 5/8
“Z”
52 1/2
52 1/4
52
51 3/4
51 1/2
51 1/4
51
50 3/4
50 1/2
50 1/4
50
49 3/4
49 1/2
49 1/4
49
48 3/4
48 1/2
49
48 3/4
48 1/2
48 1/4
48
47 3/4
47 1/2
47 1/4
47
46 3/4
46 1/2
46 1/4
46
50
49 3/4
49 1/2
49 1/4
49
48 3/4
48 1/2
48 1/4
48
47 3/4
47 1/2
47 1/4
47
NOTE: ALL LENGTHS ARE IN INCHES
G7-144
Kit #5907

CAUTION:
Do not use coax seal or tape on type “N” connector. This
antenna is designed to drain excess water around the outside
of chassis mounted “N” connector. Sealing this area will cause
the antenna to retain water.
G7-144
Kit #5907