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INSTRUCTION
MANUAL
General
Description
Theory of
Operation
Specifications
WARNING
Installation of this product near power lines is
dangerous. For your safety, follow the installation
directions.
The Hy-Gain 18AVT/WB-S is an omnidirectional, self-supporting, vertical
radiator that operates in the 10, 15, 20, 40, and 80 meter amateur bands. The
system will work against earth ground or a resonant radial system when
mounted above ground. You make your own radial system following the
manual, or you can use the Hy-Gain 14RMO radial system kit.
Performance of the antenna can be optimized for either phone or CW with
either a ground or roof mount. Regardless of the optimization, the VSWR
bandwidths of the antenna are broad enough for the antenna to operate at a
VSWR of 2:1 or less from 10 to 40 meters. The bandwidth for 80 meters is
sharper, because the antenna is top loaded.
The 18AVT/WB-S now features stainless steel hardware for all electrical and
most mechanical connections.
Heavy-duty "Hy-Q Traps" give automatic band selection. The Hy-Q traps are
parallel resonant circuits which isolate the various sections of the antenna.
This provides true
80 meter resonator extend coveraqe to 80 meters by top loadinq.
Frequency .
..................... 80, 40, 20, 15, and 10 meter amateur bands
Input Impedance .......................................................................50 ohms
SWR at Resonance .............................................................. less than 2:1
Power Capabilities.................................................................. 2 kW PEP'
Lightning Protection ............................................................... DC ground
Input Connector .............. . . . . . . . . . . . . . . . . . . . . . . . : . . . . . . . . . . SO-239
ORDER NO. 386S
Model 18 AVT/WB-S Vertical
Radiator, Amateur Antenna
1
/4-wavelength resonance on all bands. The top hat and
Electrical
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Related Manuals for Hy-Gain 18AVT/WB-S
Summary of Contents for Hy-Gain 18AVT/WB-S
- Page 1 VSWR of 2:1 or less from 10 to 40 meters. The bandwidth for 80 meters is sharper, because the antenna is top loaded. The 18AVT/WB-S now features stainless steel hardware for all electrical and most mechanical connections. Theory of Heavy-duty "Hy-Q Traps"...
- Page 2 A good ground is imperative for any vertical antenna system. Choosing a Site The 18AVT/WB-S can be mounted on the ground, on a rooftop or on a mast. When mounting the antenna above ground, remember that you must also install a ground plane radial system. When the antenna-is ground-mounted, a radial system is usually not needed.
- Page 3 NOTE: The compression clamps used with this antenna are-used in many varied applications, so the screw head may or may not contact the lockwasher or clamp body. Once it is tight, do not force the screw by tightening it further. To do so may damage both the clamp and tubes. Do not tighten any of the compression clamps until instructed to do so.
- Page 4 Figure 1 Antenna Assembly Dimensions...
- Page 5 Install a second, untightened 1 1/8" compression clamp (Item No. 17) over the M4. Slip the 20-meter trap (Item No. 12) bottom-first into the M4. (The top of this trap is tapered.) Set the trap at dimension "G" slide the clamp into place, and tighten it just enough to keep the trap from slipping.
- Page 6 ROOF MOUNTED BASE DETAILS . WARNING When Installing your system, take extreme care to avoid any accidental contact with power lines or overhead obstructions. Failure to exercise this care could result In serious or fatal Inury.
- Page 7 Screw the completed whip assembly into the top of the white 80-meter resonator (Item No. 13), as shown in Figure 2. The lower end of the resonator has a drainage hole. in the side. Screw the nut down snug against the resonator. Thread a 3/8"...
- Page 8 Installing Refer to the two mounting details in Figure 2 and Figure 4 to install the completed antenna. Antenna First mount the completed antenna on your mast (not supplied) as shown in Figure 2. Use the two (2) 5/16” x 1 5/8" x 2 ¼” U-bolts (Item No. 30). 5/16” "...
- Page 9 Weatherproof all connectors which will be exposed to rain or ice with Coax- Seal° or another similar substance. For maximum lightning protection, we recommend the use of a Hy-Gain LA-1 Lightning Arrestor, available from your Hy-Gain dealer. Your antenna is now ready to use.
- Page 10 Figure 6 Typical VSWR Curves (Ground Mount) Figure 7 Compression Clamps...
- Page 11 Final 1. The antenna operates progressively from 10 through the lowest band Adjustment for available. Even though you may not be using 10 meters at the present Setting the . _ time, 10 meters must be adjusted, because any adjustment made between 12AVQ, 14AVQ the base and the first trap automatically changes all of the bands at a later and 18AVT...
- Page 12 Parts List Item Part No. Description Qty 170603 Tube, 1 1/8 x 20142" (M5) .......………………………. 1 170606 Tube, 1 1/8” x 5 7/8” ground mount (M3) .....…………….. 1 170610 Top Radials..........……………………………….. 4 170612 Tube, 1 1/8” x 26" (M2) ........……………………….. 1 170621 Tube, 1 1/8”...