|THE DOUBLE BAZOOKA|
|SET YOUR SIGHTS ON BETTER QSO'S
Notes on Assembly:
On the cable ends you do not need to use twin lead. You can make these antennas using
a single piece of 12 gauge copper wire for each end,, you can also use ladder line etc.
I would advise using heavy end wires for strength purposes. To prevent the joints from
breaking especially for long lengths, I picked up some 1/2 inch PVC pipe and end caps.
I cut the PVC so it would overlap a few inches on the joints. I then glued the end caps on.
Place the PVC between the joints and secure with regular screw hose clamps. Put the
clamps close to the end caps and it will give a strong joint. Do this for the center also.
About The Antenna
The Double Bazooka Dipole is a very efficient single band antenna which is very quite,and does not
require the use of a balun. This antenna consists of coax (RG58) with the shield split at the center and the feedline attached to the open ends. Do not break the center conductor.
With the feedline attached directly to the two open ends this acts as a half wave dipole
along with the open wire end sections. This antenna can be cut for any operating frequency and is broad banded. It can be mounted as a flat top or an inverted vee and will handle the legal limit.
As with all antenna projects, you may have to tune length for best swr and select materials that are easily obtainable.
EXPERIMENT! EXPERIMENT! EXPERIMENT!.
|AN EXAMPLE ANTENNA
75 METER GENERAL BAND CENTER (3.925 mhz)
LENGTH "B" = 325/freqmhz = 82.8 FEET (aprox 82 feet 9 1/2 inches)
LENGTH "A" = 460/freqmhz = 117.20 feet 2 1/2 inches minus length "b" (82.8feet) = 34.4 feet divided by 2 = 17.2 feet
TOTAL ANTENNA LENGTH = 117.2 feet 2 1/2 inches (aprox)