allowing spring to flex
4245 Spring Base
for NVIS use of either
the 16' or 32' whips
Military Antenna Tripod
|Ground Stake Kit||na
|Adapter||NVIS Tilt Whip||4282||5985-01-422-8525|
This is a whip antenna that does not have any 50 Ohm matching circuits. It needs to be fed with a short high voltage wire from the antenna terminal.
Do not use a coax cable since that will add capacity which may confuse the antenna tuner.
For example the cable used on the GRC-193
Conn: SM-C-S029 I 2
CleaningUse 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.
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.
Back to Brooke's: alphabetical list of all web pages, Products for Sale, Antennas, Military Information, Home[an error occurred while processing this directive]page created 14 Apr. 2004