What you can do with these leightweight constructions you see on the picture.

Bob, ZL1RS with

 4x5-El.-1,50m-50-Ohm-Yagis

as A35RS on Tonga

Link to his page with a lot of informations about his expeditions:

ZL1RS

The mast has a height of 8m and can be erected easily without any helpers.

These Yagis are constructed with cheap leightweight materials for electric installations and you can mount and dismantle them without any tools. The boom is made of PVC-tubes with 16mm, 20mm or 25mm diameter, the element holders are the clamps for these tubes. 

A little bit more weight, but more stable construction is possible with 16x1mm and 20x1,5mm aluminium tubes as a boom. If you build up the leightweight 28-Ohm-Yagis, you must ground the coax socket to the boom. For the construction look to the "DK7ZB-Match".

The elements are made of Aluminium-welding-rods (material AlMg3) with diameters of 4mm, 3,2mm or 2,4mm. Normally this rods are sold in packages with 1kg (Price in Germany 8-12 Euro/kg). You can use 6x1mm tubes, if these rods are not available for you.

As a mast you can use a telescopic fishing rod or thin Aluminium-tubes for tents. Pse look for all pictures with the mechanical details, may be you find your own solution with parts available in your country!

The 6-Ele.-Leightweight-PVC-Yagi of Paul, G3YDY

G8BVG/p in JO01HP 

Winner of the British Backpackers Championship 2008   

In this QRP-contest max. 10Wtts are allowed,

4x6-El.-Lightweight-Yagis during the BCC-Meteorscatter-Contest in the Geminids 2008 in a rare square.

One man operation with car, tent and 0°...

Dirk,  EI/ON5GS/p

in

IO55XC

OE/OL1D

with the 7-El.-2m-Yagi

in the Alpe-Adria-Contest 2009

Heukuppe - Rexalpe 

All is possible with these lightweight constructions:

The portable satellite Yagi ("arrow-style") for 2m and 70cm, built by

Lightweight-Yagis for 2m and 70cm built by

 Jos,  PA3ALF

Details on his page:

The most Yagis have an impedance of 50Ohms and are fed with a lambda/4-choke for 2m and a 3/4-lambda-choke for 70cm. You can use the same chokes for 2m and 70cm! The length of the coax-cable should be about 40cm (not critical!). The radiator is a stretched dipole with 10-12mm insulation between the two parts. The insulated part is a piece of glass-fibre (from a broken tent of my children!). Commercial Polyamid-parts (left) available at  www.nuxcom.de.

For the 28-Ohm-types with aluminium boom use the DK7ZB-match with a grounded coax-socket to the boom

The given length in the tables are from tip to tip. The Yagis are optimized for 144,3MHz to use them for SSB/CW.

The radiator box with RG-188-PTFE-coax (for 2m and 70cm), 250Wtts on 144MHz and 100Wtts on 432MHz

Another box for 2m with RG-174, 100Wtts on 144MHz

These pictures show the genious construction of the radiator-box for a dismantable Yagi with 4mm-rods. The photos are better than a lot of words.

Construction by

Mounting of the elements

Drill a hole (3,9mm for 4mm-elements or 3,1mm for 3,2mm-elements) and push the elements through the holes. Ready!

A little bit more difficult is the reflector, because it is longer than 1m, the welding rods have exactly 1m length. Make two pieces of 50cm length and take an aluminium tube 6x1mm. Then you can drive in the 4mm-rods with a hammer.

The reflector with 3,2mm-rods, the middle part is a brass tube of 4mm. Here I used a 16x1mm-aluminium-boom. To avoid corrosion problems between Al und Cu the middle part should be coated with a colourless paint. Keep in mind that these antennas are only intended for portable use!

Another simple mounting method for the elements, here with 2,4mm-rods

These are mounting parts used by

Alfred,

Mounting with Heyco-snap-in-bushings (available at NUXCOM) for 15x15- or 20x20-mm-square aluminium booms

The example below shows 4-mm-aluminium-welding rods through 3,2-mm-bushings. When using this method with mounting through a conducting boom (round or square) add the following lengths to each element (reflector and directors):

15-mm Boom: 1,5 mm for 144 MHz, 3 mm for 432 MHz