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- INSTRUCTIONS AND SHAREWARE INFORMATION FOR THE ARMA PROGRAMS
- (Automatic Resonating Mobile Antenna)
-
- This type of an antenna was designed to provide maximum radiation
- efficiency from a moving vehicle, under adverse conditions, from
- one end of a band of frequencies to the other.
-
- The menu driven programs on this disk are useful in designing an
- ARMA antenna for any band of frequencies.
-
- The first program calculates the loading coil inductance for a
- quarter wave vertical antenna over a flat ground plane. It varies
- somewhat when the antenna is placed on a vehicle, but is a good
- ball park value. The large Hi Q coils act as a capacity hat and
- this reduces the calculated inductance significantly. For
- example, when using a small value for D in the program, as 1 inch,
- D being the thickness factor of the antenna, a 9.5 inch coil
- on the 160 mtr. band may reduce the required inductance by 20 %,
- and a 5.85 inch coil for the 40 mtr. band might reduce it
- by 10 %. Another way is to change the value of D for different
- coil sizes. Example: Use 2.4 inches for D using a 9.5 inch coil
- on 160 mtrs., 2 inches for D using a 7.9 inch coil on 75 mtrs.
- and 1.5 inches for D using a 5.85 inch coil on 40 mtrs.
-
- The second program is self explanatory. It is used to design a
- ultra high Q loading coil. It will also calculate the inductance
- of a single layer rf coil when the diameter, length and number of
- turns are known. Instructions on how to wind a high Q loading
- coil,is explained in the Builders Guide Supplement,"THE BIRD
- CATHER".
-
- The third is a set of programs for close wound coils. One for
- designing a coil and the other for determining the inductance of a
- close wound coil.
-
- The fourth group of programs is useful to determine the exact
- velocity factor of the coax that you use for the delay line.
-
- The last program is for calculating the impedance L matching
- network and the proper length of coax between the antenna and the
- phase angle detector to allow the system to have a symmetrical
- frequency response. The inductive reactance of the L network can
- be combined in the loading coil, so all that is necessary is a
- capacitor to ground to match an impedance that is less than 52
- ohms, as it is in all quarter wave vertical antennas. Revision A
- of the ARMA Builders Guide illustrates an efficient method of
- plug-in modular matching capacitors.
-
- To register this shareware and receive complete documentation, the
- BUILDERS GUIDE for the Automatic Resonating Mobile Antenna,
- including REVISION A and "THE BIRD CATCHER" supplement, send
- $20.00 to Wayne L. Jamison Rt.3 Box 2932 Trinity, Texas 75862
- Print out Registration Form under REGISTER.TXT file.
-
-
-
- This documentation has all of the necessary drawings and
- schematics to build an all band (10-160 Mtr.) mobile antenna and a
- High Q single band high efficiency mobile antenna with easy to
- change coils.
-
- This antenna is protected by U.S. patent # 4,803,493, however you
- have my permission to build this antenna for your own use but not
- to be used for a profit.
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