Summary of Contents for BILAL ISOTRON 40
- Page 1 INSTRUCTION MANUAL FOR THE ISOTRON 40 MANUFACTURED BY BILAL COMPANY 137 MANCHESTER DR FLORISSANT, CO. 80816 PH: 719/687-0650 PART 2 Re-arranged by Giancarlo Moda, I7SWX – Aug. 2010...
- Page 2 TRIMMING THE COIL For specific frequencies such as for MARS, CAP, FAA and so on where frequencies near, but not in the amateur band are required, coil trimming may be done to reach those frequencies. In cases of extreme environment interaction, trimming may be necessary for proper resonant point.
- Page 3 COMPENSATION FOR VARIATION IN LOCATION The antenna-to-ground capacitance of your ISOTRON antenna depends on its location with respect to other objects and to the ground itself, and how and where it is mounted. Antenna-to -ground capacitance affects resonant frequency and feed-point impedance of your antenna.
- Page 4 If a Bridge is not available, then a little guess work will tell the story. Once you located the resonant point and put it where you want, your SWR should be no higher than 3:1 at a low power reading. The antenna should be grounded to the mast when determining resonant point.
- Page 5 SIDE TOWER MOUNTING The antennas should be offset from the tower. This can easily be done with a 5 or 10 foot mast mounted across the legs of the tower. The Isotrons can be mounted horizontally on the mast. A light nylon cord could be attached to the mast an back to the tower at a 30 to 45 degree angle to keep the mast from drooping.
- Page 6 THE USE OF A TUNER The instructions provided basically discourage the use of a Tuner. This is for the purpose of initially tuning up the antenna. However there are times when a tuner has its place. With the increasing popularity of solid state transmitters a tuner is almost a must. Back m the days when tube finals were used the manufactures automatically provided the tuner.
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