Description
This is a military antenna system where
the radiating elements are each 4 feet long and can be combined to make
a 16 or 32 foot long antenna.
Each antenna element has a female thread at the bottom and a male
thread at the top. Harris may sell this antenna as their
SB-V35F.
The base antenna element uses 1-8 threads formed into the sheet metal.
Hints & Tips
Cleaning
Use Scotchbrite to clean all the male
antenna element threads. No lubrication is needed on the mating
threads.
During this process I found that the metal forming the
male thread on one of the base antenna elements had a couple of
hairline cracks about 180 degrees apart. The hairline crack is
not a problem.
Installation of 32' Antenna
Start with the 4245 spring base firmly
attached to a vehicle or structure.
- Screw on one of the bottom antenna elements
- Pull out pin from 4245 spring base and pull up on antenna
section. Then turn and push in pin lock in place. The
spring will now be able to flex.
- Install the lowest antenna section to be used.
- While pulling bottom antenna section over walk away while
attaching each section one at a time by screwing each section on the
prior section.
- After all sections are screwed together in a horizontal position,
walk the antenna up. The spring will assist in pulling the
antenna up. When vertical, lift up on bottom antenna element
while pulling and turning the lock pin out, then lower the
antenna.
- Lock the pin by turning it and allowing it to go in.
Take Down
Reverse the above steps. This
means unlock the base so the spring is flexible and bend the antenna
over and start taking it apart at the tip end, working back to the base.
Mounting
SCD-189023
Sugar Scoop aka Shakespeare 4257
The plan is to mount the bracket on a
pipe or fence post in the ground, install an elevated radial system and
use this
antenna with the SGC antenna coupler.
Standard 2" muffler "U" bolts have the correct center to center
distance, but the sugar scoop holes needs to be slightly
enlarged. A 5/16 Drill is a good choice. Since the 4245
Antenna base does not protrude down into the sugar scoop 3 "U" bolts
can be used and the supporting pipe can be on the inside of the
bracket. The 4 holes in the top of the sugar scoop are 7/16"
diameter and are the standard military antenna base hole pattern.
I was going to do this with the Light
Weight Beacon antenna, but it did not survive winter winds.
Tilt Whip Adapter
The bottom tube has no internal
threads, it just slips over the base. This way the antenna can be
rotated freely then the clamp locks the rotation. Typically for
radio operation the antenna would point to the back, but for driving on
the street the antenna would point to the front and be tied
down. Weight 6 pounds. Extremely strong construction.
Military Antenna Tripod
Marking:
67032 ASSY
03-2735119-1
MFR 53892
When the legs are retracted the overall length is about 33".
When the legs are folded out and with the lock pins are holding them in
both directions the height from the top to ground is about 24" and the
holes in the shoe plates are about 46" center to center. The top
plate is 6" diameter and has three holes on a 4.5" diameter bolt circle
with 90 degrees between them. The center hole is a little less
than 3.5" I.D. The shoe plates are 4 x 4.15" with a through hole
a few thousandths smaller than 1/2".
Back to Brooke's: alphabetical list of all web pages, Products
for Sale, Antennas,
Military
Information,
Home
05696 hits since May 04 2007page created 14 Apr. 2004
