GS Manufacturing
PO Box 362 Merlin, OR 97532541-471-9400
gsmfga@budget.net
The GS-3 antenna is quite different than the DK-3 style antenna. After building the DK-3 type for a few years, I designed one that would last longer. The GS-3 has no coil cover. It can handle higher power. The larger diameter coil offers a higher Q. The antenna doesn't change length and will not wear the coil out with the heavy coil moving against the finger stock all the time.
The coil is wound using #14 wire and is wrapped with 6 layers of fiberglass cloth and epoxy resin. The wire spacing is 8 turns per inch. The antenna is center loaded. The base tube is 2 inch 6061 aluminum tube and is powder painted black. The drive motor uses a clutch so overruning the coil wiper will not damage the antenna. The antenna has an indicator making it easy to see what band the antenna is near.
I have tried many different methods of matching, shunt coil and toroid and other users are using a capacitor box. I supply a toroid or the shunt coil.
The coil is13 inches in length and the base tube is 31 inches long. The whip can be almost any length. I use one that is 66 inches. The combination of Cap Hats and a shorter whip works, too. A longer length whip makes the antenna more efficient.
The model 160 has a 3 inch coil that is 18 inches long. The coil is wound using #16 wire at 10 turns per inch. No test data is available at this time. I also make 4 inch 160 that is13 inches long. This model will handle 500 watts like all others.
I use plastic for the top of the coil to reduce the detuning and the Q loss that a metal piece would cause. There is a brass piece that has a 3/8 x 24 thread for the whip to screw into.
All antennas have a 3/8 x 24 tpi female base .
I can make a insulated base that has a 1/2" stainless bolt so you can bolt it to a grounded mount, then you can put the RF hot wire to the bottom screw on the antenna. This nice idea will cost $20 more dollars
Tests made in 1994
Antenna40 meters80 meters160 meters
2-1 Bandwith2-1 Bandwith2-1 Bandwith
GS-2 2 inch coil68 Khz19 Khz
GS-3 3 inch coil54 Khz15 Khz
DK-3 Glass coil69 Khz25 Khz
DK-3 160 PVC 3" coil116 Khz30 Khz7 Khz
Prices
GS2 $375 2" coil x 17" length
GS3$4503" coil x 13" length
GS4 $5254" coil x 9" length
GS160$5503" coil x 18" length
GS4-160$5754" coil x 13" length
Thanks,
Gary Stookey KI7SD