The TV antenna type “wave channel” is popular even in remote rural areas. Easy to manufacture, it does not require complex tuning and matching with precisely proportional to the sizes of its elements — reflector, an active vibrator and Directors. The choice of the number of Directors of such antenna is possible within wide limits to vary the beamwidth and gain. In addition, the “wave channel” has a very small windage, which is important when installing a tall mast for DXing.
As the workpiece carrier for arrows “wave channel” is generally used thin-walled pipe of suitable diameter. Many at first it is unclear how to drill it through-holes for fastening of Directors, an active vibrator and the reflector, so that the axis of all the holes lying in the same plane. You can use the following method.
At the base of the auxiliary boom is drilled horizontal through hole in which is inserted a short section of rod or tube and towards the annular rubber bands or a few turns of adhesive tape are fixed on the building level two linings in order to avoid bias in contact with the bearing arrow. The minimum thickness of the linings is determined as the difference between the radii of the carrier boom and auxiliary parting bars or tubes.
Then this piece set of horizontal accuracy check level — pegging vertically drilled through holes for fastening of Directors, an active vibrator and the reflector. It is a pity that the high efficiency of this method is guaranteed only when using drill press or hand drill with a special vertical guide.
It is difficult to achieve reliable fastening of Directors, an active vibrator and reflector due to only one tight they fit in the holes of the carrier boom. When the antenna swings in the wind this mount quickly becomes loose. Often diagrammable elements (especially in the case of their vertical location) are excluded.