Archive for the ‘Antennae’ Category.
I bought 6 alluminium tubes, 2m long, diameter from 45 down to 20mm for 40m quarter wave vertical antenna. This 10m simple construction collapses to 2m pack with nly 45mm diameter. The base is made from PVC plastic isolator, which is fixed to alluminium plate with 4 M6 screws and additional nut, placed inside the plastic hole, which is normally used to fix the steerer tube on the bicycle.
Photos are worth more than 1000 words…
This is part II for 4 element 6m yagi. Part I is about metal parts. Here is some brief description about electrical connection and preliminary test.
4. Antenna feed
To finish the antenna few parts must be 3D printed (or produced with other materials, like plastic pipes). Holder for air coil consists of three parts: coil holder, coil support and connector holder.
Coil holder is simple cylinder (pdf drawing: chokeholder), which is long enough to accommodate 12 turns of RG58 or similar cable:
6m band is sometimes called “magic band”. It has combined propagation properties of HF and VHF. When conditions are good, very long DXs are possible. Beside the sporadic E occurence some other requirements are essential. One of the most important pieces of equipment is good antenna. There is no shortcut for good performance in small package. Good antenna is big when lambda is long. For 6 meters, the antenna usually occupies about 3x3m floor area. Here’s my implementation based on Ljubisa Popa – POP YU7EF design EF0604S.