Revised 14 June 2003
11
Note:
The phasing line must be installed so that there is a 180 degree phase
reversal in the connections to the elements. The ends of the phasing line
have been color coded to facilitate making this connection correctly.
3. Identify the terminated twisted pair of the phasing line. The red coded terminal
connects to the element feed point to your left as viewed facing the antenna looking
down the boom. The uncoded terminal connects to the other side of the feed point.
Using this procedure for each element results in the red coded terminals being
connected to the opposite side of the feed point of the other element. This procedure
provides the required reversed connection between the elements. See the schematic
diagram in APPENDIX E, “OPERATIONAL NOTES”.
The stainless 1/4-20 hex-head bolt head will be between the mounting plate and the
element, with the bolt protruding downward when the element is in operating position.
If it is not, make it so now. Verify that the drain holes in the element tubing will also
be on the bottom side of the element when the antenna is in its operating position.
4. Install a flat washer, a split ring lock washer, and a nut on each bolt and tighten.
5. After the element is secured in place on the mounting plate, install the following
hardware on each bolt in the following order:
a) a fender (large diameter) washer
b) the greased copper strap from the hairpin assembly
c) another fender washer
d) the correct terminal from the phasing line, greased and flat side to the fender
washer
e) a flat washer, a split ring lock washer, and a nut.
6. Tighten the hardware for the feedpoint connection.
HAIRPIN AND ELEMENT LENGTH SETTINGS
Settings for the exposed length of the element tips and for the position of the adjustable
shorts on the tuning and matching should be made at this time. See APPENDIX E,
“OPERATIONAL NOTES”, “Tune-up Procedures for the 2D-40A” to determine the proper
dimensions to use for your intended mounting height.
This completes assembly of the antenna. Double check all joints and connections, then
prepare the antenna for raising into position.
Be particularly careful with regard to working on towers and near power lines, either of
which can and has caused injuries and fatalities. No part of the antenna or tower should
ever be in a position such that it could come into contact with a power line in the event
that it fell, slipped, etc.
