248CP22A ASSEMBLY MANUAL
ASSEMBLING THE VERTICAL ELEMENTS
Note: The vertical element set is shifted forward on the boom by 1/4 wave lengths. This increases isolation
between element planes, improving circularity and ease of phasing / matching the two element sets.
8. Repeat steps #2 through #5 for the Vertical elements, using the Dimension Sheet as your guide to lengths and
spacing.
INSTALLATION OF THE VERTICAL DRIVEN ELEMENT BLOCK DETERMINES THE CIRCULARITY OF
THIS ANTENNA. THE ORIENTATION OF THE BLOCK FOR RHC - RIGHT HAND CIRCULARITY, IS
SHOWN ON THE DIMENSION SHEET.
9. Viewed from the rear of the boom (rearmost Reflector HORIZONTAL), the VERTICAL Driven Element Block
mounts to the LEFT hand side of the boom with the two Balun connectors oriented to the FRONT. Secure with
8-32 x 1-1/4” screw. Install the Shorting Bars as in step #7.
10. Before installing the Baluns and Matching / Phasing Harness, thread 3/8” SEAL NUTS fully onto all
connectors, with the black Neoprene face of the nuts facing out. Attach Baluns and Phasing lines to the
Driven Element Blocks and Junction Block as shown on the picture below. Tighten the connectors
gently
using a
7/16" end wrench. Once the connectors are tight, back the Seal Nuts out and finger-tighten firmly up
against the face of the connectors (or tighten
gently
with 1/2” end wrench). A lot of torque is unnecessary.
Depending on model and polarity, the Vertical balun may loop around another element. This is normal. Form
balun coax until it is close to the boom and secure with a nylon cable tie. Also secure the other balun and the
matching / phasing harness coax with cable ties. Ties should be snug but not crushing or kinking the coax.
11. Use good quality coax and “N” connector for your feedline (see Installation Tips). Secure feed coax near
connector on Junction Block, to provide stress relief. Allow about 60” of coax to hang in a loop between the
rear end of the boom and the reattachment point (at least 12” beyond element tips) on the mast or crossboom.
Do not
route feedline thru boom to mast plate as exiting antenna here will adversely affect circular
field.
12. The boom to mast plate is normally mounted to the boom at the balance point (SEE DIMENSION SHEET).
Since the feed line represents significant weight it is best to have it attached and fastened to the boom with
cable ties before final mounting the plate. Use two 1" U-bolts and the stainless nuts and lock washers
provided. DO NOT OVER TIGHTEN. 2” U-bolts (and stainless steel nuts / lock washers) are provided for
mounting the antenna to your NON-CONDUCTIVE mast or crossboom. Other size u-bolts and cradles are
available upon request.
M
2
ANTENNA SYSTEMS, INC.
4402 N. SELLAND AVE.
FRESNO, CA 93722
(559) 432-8873 FAX: 432-3059
www.m2inc.com
Email:
Содержание 248CP22A
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