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308 Industrial Park Road
Starkville, MS 39759 USA
(662) 323-9538 FAX: (662) 323-6551
INSTRUCTION MANUAL
General
Description
Feedline
Coax-Seal© is a registered trademark of Universal Electronics, Inc
Ph:
The Hy-Gain Model 18V-S is a trapless, vertical antenna which is manually
tuned to any band, 10 thru 80 meters, by a simple adjustment of the feed
point on the base inductor. It is designed to be fed with 50 ohm coax, and
works efficiently for DX or local contacts. It now features stainless steel
hardware for all electrical and most mechanical connections.
The antenna is self-supporting and can survive winds in excess of 80 mph. It
is highly portable and knocks down to an overall length of 5 feet.
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 Injury.
Use 50 ohm coaxial cable (RG-213/u preferably) and attach to the antenna as
shown in Figures 2, 5 and 7. After attaching the coax, seal it from moisture
using Coax-Seal° or some similar substance.
Model AV-18VS
10-80 Meter Vertical Antenna
WARNING
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Summary of Contents for Hy-Gain AV-18VS
- Page 1 Starkville, MS 39759 USA (662) 323-9538 FAX: (662) 323-6551 INSTRUCTION MANUAL The Hy-Gain Model 18V-S is a trapless, vertical antenna which is manually General Description tuned to any band, 10 thru 80 meters, by a simple adjustment of the feed point on the base inductor.
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Page 2: Assembly
Select the base bracket and the lower base insulator and install as shown in Assembly Figure 1. Select the two upper base insulators and the base inductor insulator strap and install as shown in Figure 2. NOTE: Coax braid must also be installed as shown. Figure 3... -
Page 3: Upper Insulators Fasten With Hose Clamp
Select the M1 section of tubing (1 1/4") and place It over the top of the lower base insulator. Align the hole in the base of the M1 section of tubing with the hole in the lower base insulator as shown in Figure 3. Place a #10 (Item 14) screw in the hole and tighten securely. - Page 4 Select the M3 section ( /4" x 531/2") and slip the end with the smallest hole M2 section and fasten with #6 hose clamp (item29). into the /e" Select the M4 section x 53'/4") and slip the end with the smallest hole into M3 section and fasten with #6 hose clamp (item 29).
- Page 5 Ground Mounting Drive a 3 foot piece of pipe (such as 1 plumbers pipe) into the ground and 1/4" attach the antenna as shown in Figure 4. Drive an 8 foot copper-clad steel ground rod into the ground. Attach the ground rod to the base using #10 wire. Remember, a vertical antenna is only as good as the ground system it is working over.
- Page 6 Radials The radials can be constructed of either copper or aluminum wire. The recommended method of installing the radials is to attach them to the screws at the bottom of the base assembly. The 33 foot dimension is measured from the base assembly to the strain insulator, and is optimum for 40 meter operation only.
- Page 7 PHASED MULTI-BAND VERTICALS for ADDITIONAL GAIN and LOW ANGLE RADIATION I N T R O D U C T I O N The following Hy-Gain verticals are well adapted for the phasing arrangements shown in this reports MODEL 18HT-S HY-TOWER...
- Page 8 The following data was experimentally derived "image antenna" or installed on the roof using on the Telex/Hy-Gain test range. Due to the a radial system. many factors that vary and influence the performance of an antenna, such as grounding...
- Page 9 When excited "out of phase" these same verti- cals can be made to give an "end fire" or bi- directional pattern in the opposite direction through the plane of the verticals. This then nulls out signals in the opposite directions. More gain is exhibited by the broadside pattern over the "end fire"...
- Page 10 SPECFICATIONS Broadside End Fire Pattern width, half power points 60 degrees 80 degrees Gain over single vertical 3.86 dB 2.3 dB Side attenuation 30 dB 20 dB Impedance 50 Ohms 50 Ohms Directional characteristics Bi-Directional Bi-Directional Figure 2 Typical Installation Phased (2) 18 HT 40 Meters 7200 KHz Design Frequency...
- Page 11 CARDIOID ARRAY (Uni-directional) When two or three identical verticals are ex- cited directly and fed 90 degrees out of phase with a spacing of 1/4 wave length, a cardioid pattern results. This pattern may be switched in either direction. By inserting a 1/4 wave length delay line the antenna will "fire"...
- Page 12 The beam pattern for two 1./4 wave length verticals will be approximately 120 degrees. An arrangement of three switchable verticals gives a 60 degree pattern in six selectable directions. Figure 4 360 Cardioid Arrangement...
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Page 13: Radiation Pattern
E L E C T R I C A L S P E C IFICATIONS: Two Phased Verticals Three Phased Verticals Pattern Width, half power points 120 degrees 60 degrees Gain over single vertical 4.5 dB 4.5 dB Side attenuation 20 dB 20 dB Rear attenuation... - Page 14 SWITCHES & CONNECTORS OPTIONAL SPACING Various antenna spacings may be selected Low loss constant impedance type coaxial from charts A, B, and C, for single band, duo switches and connectors should be used when band or multi-band arrangements. Associated splicing phasing lines. B&W multi-position, radiations patterns for a specific spacing is single or multi-gang coaxial switches with Am- shown in Figures 1 through 5 for each band.
- Page 15 80 meter bi-directional pattern (all SW positions 3) refer to Figure 1, Part 2 "Radiation Patterns" NOTE: Due to close electrical spacing (1/4 wave) on 80 meters for Broadside (position 1) and Endure (position 2) the SVWR may be somewhat higher than 1/2 wave spacing.
- Page 16 Note: Corralate Patterns to spacing used in installation Figure 6 Radiation Patterns - Typical Spacing For Broadside And Endfire Arrangements...
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