Tuesday, 9 August 2011

What beam is that?

A couple of months ago we put a 3 element Yagi antenna on the VK3SCG tower at Gilwell Park but I'm trying to find some info about the antenna.

I've posted four photos here in the hope that somebody might recognise the design. At best guess the boom is about 4 m long. Along the boom toward the director is a parallel tuning arrangement made of two aluminium tubes about 8 mm in diameter and about 40mm apart.

Each trap has two drain holes that need to point downward.

Any ideas, please leave me a comment below.

Yagi on the ground after assembly



Yagi being assembled, viewed from 30m above.

Yagi about to be hoisted up the tower


Parallel tuning arrangement

73
at

3 comments:

  1. Peter13 August 2011 at 09:00

    I also posted this request on a couple of antenna forums and following a couple of leads I confident the antenna is an old HB33 made by TET.

    Also the tuning and feed section, seen in the photo above, is toward the reflector, not the director as earlier indicated.

    Thanks to those who helped out.

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  2. Anonymous15 August 2011 at 19:38

    Hi Peter by the look of the phasing line it is very similar to my TET yagi (HB443dx) Both the reflector and the driven element are fed giving the antenna a wider bandwidth. It looks a fairly old TET Probably somewhere around 1980 or before. Ken VK4QH

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  3. G0JKZ19 August 2011 at 06:27

    Just seen it... It is an HB33. I actually have one in the garden. The parts are still available from the Australian manufacturers. They sent me a full manual for it as well.

    George G0JKZ

    ReplyDelete