Tarheel Antennas MFJ-1792, Инструкция по эксплуатации

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MFJ-1792/1793 Instruction Manual Vertical Antenna
2
The radiating element on the 80 meter band is 33 feet tall, constructed with large diameter
aluminum tubing. The smallest diameter used is 1 1/8 inches. The antenna has a swivel
base to allow easy mounting and access to the top for tuning the 80 meter band. The
swivel base is constructed with heavy duty thick aluminum, and a large diameter, super
strong, solid fiberglass insulator rod. The antenna can be mounted on a short mast of 2"
maximum diameter. MFJ supplies U-Bolts for use with 1.5" maximum diameter masts,
however you can buy your own 2" diameter U-Bolts and install them in the holes provided
on the base mount. Since the antenna is 35 feet tall it requires guying. Guying anchors
and guy lines are not supplied with the antenna, however you have to se your own guy
wires. For best results, non-conductive marine type nylon cords can be used.
BANDWIDTH, SWR, AND POWER HANDLING
- The 40 meter band has a very wide bandwidth (approximately 800 KHz) . The entire
band is covered at less than 1.5:1 SWR.
- The 80 meter band is top loaded with a high-Q loading coil. The SWR on this band is
very low (less than 1.4:1.0). The bandwidth is approximately 80 KHz at 2:1 SWR
measurements. The lowest SWR is ensured on this band because the antenna is matched
using a L-network at the feed point on the base of the antenna.
- The 20 meter band tunes very low SWR (less than 1.4:1.0) . The bandwidth is
approximately 300 KHz. The 20 meter operating frequency is easily adjusted by
increasing or decreasing the length of the decoupling stub at the bottom of the antenna.
MFJ- 1792/1793 is capable to of handling full legal PEP power as follows:
BAND SSB CW
80 meter
1500 1000
40 meter 1500 1500
20 meter 1500 1000
SAFETY PRECAUTIONS:
1.) THIS ANTENNA IS AN ELECTRICAL CONDUCTOR
2.) ANY CONTACT BETWEEN THE ANTENNA, FEEDLINE OR
SUPPORTING STRUCTURE AND POWER LINES WILL
RESULT IN DEATH OR SERIOUS INJURY.
FOR SAFETY PLEASE:
1.) DO NOT INSTALL THIS ANTENNA WHERE THERE IS ANY
POSSIBILITY OF CONTACT WITH UTILITY LINES.