Home › Forums › temp › Need Help With Any Possible Small Antenna For SSTRAN 3000 › One Possible Solution
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I read this forum frequently, but don’t always have time to post things.
The AMT3000 requires a base loaded antenna for serious range. The internal tuning circuit is fine for in-home use, but the tiny inductors on the board limit range. The base loaded antenna moves the tuning inductance out to the big 3″ base coil which is many times more efficient. Also, antenna capacitance is fine tuned by adjusting the length of the antenna. See the plans and tuning instructions at: http://www.sstran.com/pages/sstran_buildant.html
In your special case, you have been approved to use a 102″ whip antenna. The trouble with a CB whip is that there is no length adjustment. MFJ sells a real nice 10 ft telescoping whip. See: http://www.mfjenterprises.com/Product.php?productid=MFJ-1954
This whip has a standard threaded 3/8 x 24 stub at the bottom. You can buy a matching threaded mount that could be installed in the center of the top PVC cap of the loading coil. The telescoping feature will allow length adjustment for fine tuning.
You could mount the coil and antenna on a base plate with a pipe flange and then clamp the base plate somehow to the air conditioner.
I don’t normally recommend the MFJ whip for outdoor use because it isn’t strong enough to withstand high winds, but in your case, it will be somewhat sheltered from wind by the building. If it does ever break due to a freak storm, just get another one for $29.95 (cheap).