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436CP42UG ASSEMBLY MANUAL
7. Install the 8-32 x 1/4" set screws (internal Allen head - tool supplied) into the SHORTING BARS. Slide the
bars onto the 1/8" Driven Element Block Rods and the 3/16" driven element rod. Position the Shorting Bars
as specified on the Dimension Sheet: the given distance is between the outer face of the driven element
block and the inner face of the shorting bar. Align the bars and rods to each other and tighten the set screws.
ASSEMBLING THE VERTICAL ELEMENTS
Note: The vertical element set is shifted forward on the boom by 1/4 wave length.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 AND DRAWING AND DESCRIBED BELOW:
9. Viewed from the rear of the boom (the Horizontal Driven Element Block), is to be mounted on the top of the
boom. 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.
Mount the 'T' Junction Block on the same side of the boom, just to the rear of the horizontal driven element.
10. Attach Baluns and Phasing lines to the Driven Element Blocks and Junction Block as shown on the drawing.
Tighten the connectors
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 feed line (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 cross
boom. Do not route feed line to boom to mast plate as exiting antenna here will adversely affect
circular field.
12. A conventional flat plate was not used for this ultra gain CP antenna, because it severely affected the
circularity and gain of this antenna. We found that a smaller angle plate bolted to the boom allowed the
antenna to work up to its potential. We have drilled two sets of holes in the boom to attach the plate.
If neither of these positions work for your particular application, feel free to drill your own two holes. Mount
the plate with two 8-32 x 2" screws and tighten securely, 1/2" and 2" u-bolts are provided to match your
mast/boom diameter. Be sure not to over tighten the U-bolts as this may damage your mast.
INSTALLATION TIPS
13. A circular polarized antenna creates a field in all planes or polarities. Performance DETERIORATES
SIGNIFICANTLY if it is mounted on a metal (conductive) mast or cross boom. A mast or cross boom of any
NON-CONDUCTIVE material must be used. Fiberglass is the prime choice for its strength and weather
resistance. Mount so that element tips are at least 12" from any conductive material (mast, tower, feed line,
etc.).
14. Recommended feed lines, in order of preference:
Andrews or Celwave 1/2" hardline
Times FM-8, LMR400, or Belden 9913 (We can highly recommend LMR400 because of its improved
resistance to moisture and reduced weight.)
Try to keep the cable run to under 100 ft. to prevent excessive signal loss.
15. If stacking two or more antennas, contact M
gently using a
7/16" end wrench. A lot of torque is unnecessary. Depending on
THIS COMPLETES THE ANTENNA ASSEMBLY.
2
specific stacking information
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