October 2010 I replaced my old Fritzel FB-33 tribander
(20/15/10m) trap Yagi by a Tennadyne T6 6-element LPDA (Log
Dipole Array) which now works very well and offers no-tune
coverage continously from 14 to 30 MHz. The antenna resides 15 meters
level on the top section of a Versa-Tower which is mounted on top of an
unused chimney. This chimney contains a reinforcing steel tube
and is filled with concrete all the way down to the basement of our house.
However, a lot of work had to be done before I could take this picture
from an attic window ...
dismantling the old antenna, I cleaned and re-painted the
top-section, installed the new antenna rotor Create RC5A-3 with
the UC-1 universal coupler plate, the CK-46 mast bearing and the
stainless-steel supporting mast assembly. The result is shown on this
picture. Note the tiltable joint in the mast assemby - it plays a
vital role since it allows final assembly of the partially assembled
antenna on the roof.
close-up view of the rotor and coupler plate. The tower top-section is welded
to a 1" thick steel-plate covering the chimney.
Airline brough my T6 from Toledo / USA to Frankfurt / Germany.
After inventory of all antenna parts on the basement floor ...
... I pre-assembled the four boom-sections with only the two inner sections of each element ...
... and brought these four pre-assemblies up to the balcony to put them together - this is the result.
Now this assembly was mounted on the supporting mast ...
... and subsequent tilt-and-rotate allowed me - standing between the chimney and the roof - to reach the pre-assembled section ends in order to install more and more tubing sections.
T6 comes with nothing but two holes and screws to attach coax at
the feedpoint, a solution which is not good at all ! So I constructed this weatherproof feedpoint-assembly with sliding hood
from aluminium stock, PCB material, an SO-239 connector,
stainless-steel hardware and grey perspex.
was constructed in the same fashion - the balun is a common-mode choke
made of 7 turns of RG-58 coax on two stacked Amidon FT140-43
The feedpoint-assembly with hood, installed at the boom end with the shortest element ...
and the balun-assembly still without hood, installed at the boom-mast
insulator. Except for the balun windings Aircell-7 coax is used.
elements, the feedpoint-assembly, the balun-assemby and the shorting
stub at the boom-end with the longest element are installed now.
is my plasic crow named "Karl-Theodor" (after Germany's former defence
minister Karl-Theodor zu Guttenberg) - he defends the T6 against
pigeons and 8 months after the installation I can say that he does an
outstanding job, since I have never seen any pigeon sitting on the
A view over my hometown Pforzheim, standing on the chimney below the T6 heading North.
... mission completed !
is the roof of our house with the Tennadyne T6 LPDA installed on
the chimney and the Titanex V40 vertical on the balcony. My radio shack
is the corner-room behind the steps with a door to the balcony.