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- Page 1 20 Meter Vertical Antenna COM-20VA COM-20VA-INS-Revision 2 COMTEK SYSTEMS 2016 1200 Southeast Ave. - Tallmadge, OH 44278 USA Phone: (800) 777-0703 Technical Support and International: (330) 572-3200 Fax: (330) 572-3279 E-mail: Info@comteksystems.com - 1 -...
- Page 2 Congratulations! You are now the proud owner of a Comtek 20 Meter Vertical Antenna. This antenna may be built as a 20 meter, 17 meter, 15 meter, 12 meter or 10 meter monoband vertical antenna. Specifications: • Full band coverage on 20 or 17 or 15 or 12 or 10 meters with SWR under 1.5:1 •...
- Page 3 Overhead Power Line Safety Before you begin working, check carefully for overhead power lines in the area you will be working. Don't assume that wires are telephone or cable lines: check with your electric utility for advice. Although overhead power lines may appear to be insulated, often these coverings are intended only to protect metal wires from weather conditions and may not protect you from electric shock Keep your distance! Remember the 10-foot rule: When carrying and using ladders and other long...
- Page 4 The wire radials should placed as symmetrically as possible around the vertical antenna and spaced evenly, regardless of how many radials are used. Do not cross or bunch any radial wires as this nullifies their effectiveness. If you have limited space, put in as many straight radials as you can. The radial wires can be attached to the vertical using the lower left V-Bolt Saddle nut.
- Page 5 ® 3. Slide the 1" OD element that has the EXTREN insulators installed in the U-Bolts as shown ® below. Adjust the EXTREN insulators so they are centered on the U-Bolts. Tighten the U- Bolts evenly so the length of the exposed threads is approximately equal. Any U-Bolt should be tightened evenly from side-to-side with an equal amount of thread above each nut.
- Page 6 For 20 Meters Frequency Approximate Overall Length 14.000 16 Feet, 8-1/2 inches 14.150 16 Feet, 6-1/2 inches 14.225 16 Feet, 5-3/8 inches 14.350 16 Feet, 3-5/8 inches Figure 1 COMTEK 20 Meter Vertical Antenna Assembled Diagram - 6 -...
- Page 7 Tuning Tuning the COM-20VA 20 Meter Vertical Antenna is straightforward and intuitive. If you use an SWR meter or an analyzer at the base of the antenna you will get the most accurate readings in a timely fashion. Since the bandwidth of the antenna is wide the adjustment parameters are relatively broad and fine adjustment is not usually necessary.
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Page 8: Technical Support
All products manufactured by Comtek Systems are warranted to be free from defects in material and workmanship for a period of one (1) year from date of shipment. Comtek Systems’ sole obligation under these warranties shall be to issue credit, repair or replace any item or part thereof which is proved to be other than as warranted; no allowance shall be made for any labor charges of Buyer for replacement of parts, adjustment or repairs, or any other work, unless such charges are authorized in advance by Comtek Systems.
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