Transmitter power questions.....

[John Ferrell]

The antenna gain is less than 1 dbd. The last "d" means as compared to a reference dipole. If needed, I will review an antenna book for the relationship to a "dbi" which is isotropic.

The polarization is not consistent since a hand held whip antenna less than a quarter wave is being used.

The ground to air range is so low that the systems can operate two miles apart without interfering with each other. Since all of the equipment is handheld and battery powered, no one is especially interested in using the maximum legal power level.

BTW, IMHO, their vigilance in the matter of nearby radio transmissions is commendable in these unsettled time.

John Ferrell    
http://DixieNC.US

  ----- Original Message ----- 
  From: Bill Glaze 
  To: discussion at nsrca.org 
  Sent: Monday, April 11, 2005 8:35 PM
  Subject: Re: Transmitter power questions.....


  I can answer a few:
  Transmitter power:  1 watt maximum.  Actual, really about 200 milliwatts
  Transmitter radius is difficult, because you need to have an effective Field Strength Meter, but I have successfully operated an airplane's controls at 1.1 miles, (line of sight) but I didn't intend to fly; I couldn't even have seen the airplane.
  Antenna used: Vertical Whip (Normally; that's what's supplied)
  Antenna gain; I don't really know the answer to that one.
  Polarization:  Vertical  (which is normal form a whip antenna.)

  bravo52 wrote:

    Hey Guys, 
      I am working on a project to get RC on my Air Force Base and they have a few questions........  Can anybody answer these questions for me given a standard Futaba or JR radio?  

    1. What is the transmitter power? 
    2. What is the radius the transmitter will operate effectively? Consider miles not Line-of-sight. (I guess that depends on #1)
    3.  What type of transmit antenna will be used, e.g., parabolic, whip, telescoping single pole, ect?
    4.  What is the transmitter antenna gain? 
    5.  How is the transmit antenna polarized, e.g., horizontal, vertical, etc.? 

    TAI
    v/r
    Jerry L.

    P.S. I tried to call Tony at RS but he left early...............hmmm.......was he at the field????
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