Model SL-30-15
$359.00 including shipping to lower 48
Note: there are more detailed pictures and closeups of this antenna
coming.
Specifications:
Size-10 1/2 feet per side
Element Material- 3/8" and 1/2" dia. solid aluminum
rod
Cross boom- 1" square aluminum with boom to mast assembly
Maximum Mast Size- 2 " nominal
Element Fastening Clamps- Acetal (Delrin) UV stabilized
Bolt Sizes- On element clamps, 1/4-20 and Delrin Clamps,
5/16-18 Stainless Steel
Feed Point Connector- SO-239 in die cast aluminum box.
Feed with 50 ohm coax for strictly 30 meter operation or feed
with 450 ohm window line or 600 ohm open wire line for four band
operation.
Matching System for 30 meter operation- Beta match with
adjustable shorting bar. No tuner required when used only on 30
meters with coax feed.
Description:
Antenna is basically a 30 meter full half wave dipole
formed into a square using solid rod as the radiating elements.
Has some unique characteristics, for example it has a low take
off angle on all bands from 30-15 meters making it an ideal DX
ing antenna. In addition the Azimuth pattern is almost omnidirectionl
so it does not require a rotor as a rotatable dipole would. Elevation
patterns are also cleaner with less lobes than an equivilant straight
flat top dipole on the bands 20-15 meters. At only 10 1/2 feet
per side it is fairly compact and easy to mount not requiring
two or more supports as a standard dipole. The radiation patterns
are very similiar to a 33 foot vertical dipole but in the horizontal
mounting it is a much quieter antenna than any vertical. The transmission
line does not have to extend straight out from the center (for
a half wave length) as a vertical dipole's transmission line.
Being a full half wave length on the lowerst band, it is not a
compromised antenna as many of the other limited space antennas.
This square loop can be fed with 450 ohm window line for 4
band operation. The window line runs from the antenna to a tuner
balun fixed as close as possible to your radio with a built in
tuner or your outboard tuner. Then coax (a short of run as possible)
from the balun to radio or tuner.
The antenna can also be used for 30 meter operation with 50 ohm
coax feed and no tuner is required. Adjust Beta match shorting
bar for lowest SWR.