8. Attach the feedline and route forward to the mast. Secure at regular intervals with cable ties. If
using hardline, provide support near the feed connector to relieve any stress on the dipole block
mounting screw and connector.
9. GENERAL COMMENTS. It is always a good idea to check out the
antenna with a little RF prior to installing it in some inaccessible
location. DO NOT use any PL-259 fittings or adapters at these
frequencies. Very small problems in coax and in connectors can
cause MAJOR VSWR problems. Even a loose connector will affect
the VSWR noticeably.
VSWR ADJUSTMENT
:
We have found the best VSWR across the band is found when the
dipole is straight up as shown, Occasionally the VSWR can be
improved slightly by tilting the dipole forward or back just a bit. If you
do not have very good measurement equipment, we suggest you not
change the tilt. Typically the match is 1.2 to 1.4 from below 900 to
above 926 MHz. One side of the dipole is 1/4,” tubing; the other is
solid rod and will require more effort to bend. Start with the soft side,
bending it slightly one way or the other. If improvement is noted,
THEN do the same to the solid rod side.
BE SURE TO SUPPORT
THE BLOCK SO AS NOT TO PUT UNDUE STRESS ON THE
MOUNTING SCREW.
VSWR may be adjusted slightly for improvement in your particular part of the band by slightly
bending the unsupported upper loop of the driven element towards, or away from, the first
director. This can be done with a screwdriver tip As shown.
Bend in small increments to avoid
damage to internal balun and connections at the center of the dipole. Hold the block firmly
to the boom- bending the dipole FORWARD tends to pry the block away from the boom.
Check after each adjustment and note shift in the VSWR curve.
M
2
ANTENNA SYSTEMS, INC.
4402 N. Selland Ave.
Fresno, CA 93722
(559) 432-8873 Fax: 432-3059
www.m2inc.com
Email:
902-14WLC ASSEMBLY MANUAL
Summary of Contents for 902-14WLC
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