Jim - GM3BQA's - New Tennadyne (T10) Log Periodic

During the winter storms of 2002 Jim lost most of his aerials. The towers and rotators survived but the aerials themselves such as the log periodic for the 20-17-15-12-10 metre bands became just a tangled mess.
Jim decided to invest in a new Log Periodic, and he chose the T10 from Tennadyne.

I had the pleasure of being able to assist Jim with the assembly and raising of his new aerial during May-June 2002, and during the final stages of assembly I went out and bought myself a new Fuji Finepix digital camera with which I recorded the following pictures:-

Boom centre and sub mast insulated fixing plate This shows the centre of the twin boom and element fixing arrangement.
A dummy stubmast was used just to try everything out on the ground before raising the boom up for bolting onto the real submast which with a 24 foot overall length of boom is nearly 13 feet off the ground with the mast cranked over.

feedpoint end of the boom with choke balun

 Feed point end of the twin boom with the 8 turn Collins choke balun made from 50 ohm coax. The two square section booms are held apart by a number of insulated spacers.

boom with the front seven elements attached

 The twin boom seen from the feed point end and with the 7 forwardmost elements attached. At this point the boom was raised upright and attached to the stubmast. The remainder of the elements (the longest ones) were then attached to the boom and the rear end shorting stub fastened before the whole assembly was winched up into position.
All the boom and element junctions which are conductive have graphite powder embedded in WD40 in them in order to expell salt air and to ensure conductivity.
the 10 element log periodic ready to go up The T10 is now complete and mounted on the stubmast above the Create rotator in the cage on top of the P60 Versatower ready to be raised into the vertical position.
The North Sea is less than a mile away with Bass Rock just off to the right of the picture. Precautions against the ingress of airborne salt pollution and dangers of corrosion are therefore absolutely essential.
the T10 ready for some serious DX'ing The T10 at approximately 35 feet above the ground pointing slight east of south. At this point we verified that the SWR etc. was OK using the MFJ antenna analyzer before calling FR5ZU/T who was running a pile-up operating split on 15 metres. Jacques came back to Jim's call after just a couple of calls using just 80-90 watts PEP output.


For details of the Tennadyne T10 visit Vine Antenna Products

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