Transmitter power questions.....

[John Ferrell]

That sounds familiar.
I have always thought of isotropic being like a bare light bulb radiating 
energy.

BTW, Bill & I defied fate again yesterday and flew all afternoon under the 
dreaded towers at CCRC....

John Ferrell
http://DixieNC.US

----- Original Message ----- 
From: "Bob Richards" <bob at toprudder.com>
To: <discussion at nsrca.org>
Sent: Tuesday, April 12, 2005 11:40 AM
Subject: Re: Transmitter power questions.....


> John,
>
> IIRC, the relationship between dipole and isotropic is
> about 2.1 dB.
>
> Now that you mention it, they probably run site
> surveys to check for unauthorized transmissions and
> that is why they want to know as much information
> about the expected transmissions from on-base.
>
> Bob R.
>
> --- John Ferrell <johnferrell at earthlink.net> wrote:
>> 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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