The design
The folding beam is a 2-element directive antenna for five amateur bands (20/17/15/12/10m band, 6m band optional). It consists of wire elements attached to a support structure in a concentric way. The center post carries the support cords and is a coaxial feeder for the drivers. The driver/reflector arrangements are fixed to the fibreglass spreaders.
![Antenna](../img/design/Gesamt.gif)
The feedpoint cord support is molded onto the center post. Connector SO-239 (N type socket optional at no extra cost)
![Detail Feeder](../img/design/Einspeisung.gif)
The hub takes up six swivel spreaders and electrically isolates the center post from the mast or rotator underneath
![Detail Hub](../img/design/Hub.gif)
The spreader sections are connected with locking swivel joints
![Swivel joint](../img/design/Rastgelenk.gif)
open swivel joint
![open swivel joint](../img/design/Rastgelenk_offen.gif)
The spreader tips have rounded heads with zig zag slots for the support cords
![Spreader tip](../img/design/Spreizerspitze.gif)
The center post acts as a coaxial feeder, each driver is fed individually
![driver feed](../img/design/Speisung.gif)
Clamping the wires onto the spreaders is a snap with special clips!
![wire clip](../img/design/Elementhalter.gif)
Join wire ends and spacing cords with these universal detachable clamps
![universal clamp](../img/design/Universalklemme.gif)
The top cap has spacers to provide air flow and easy moisture escape from the center post
![top cap](../img/design/Kappe.gif)
These optional storm brackets will damp lateral spreader movement and prevent from folding up in strong wind gusts
![storm brackets](../img/design/Sturmklammer.gif)
Antenna collapsed to only 1.15 m (45") total length
![antenna collapsed](../img/design/Packed.gif)
Optional transportation & protection bag with shoulder straps
![bag](../img/design/Tasche.gif)
Optional large clamp-on ferrite for K9YC style common mode choke, 3 turns of cable up to 11.5 mm (0.45") O.D., shown here with RG-213. Perfect for portable use, easy to fit and to remove. No need to cut the connector (in opposite to using a string of ferrite beads).
![choke](../img/design/choke.gif)
Optional thick walled rotating guy ring for 30mm O.D. top section masts, no rope thimbles needed due to rounded edges.
![guy ring](../img/design/Abspannring.gif)
Please find more pictures and information in the construction manual.