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Real Range On Part15

L

Levi

Guest
No matter what power you run at your station be it 100mw or 75mw if the guy down the street got an EL-Cheap-oh radio he may not hear you at all.In part15 we must get off this power at the station thing.The things we need to work on are our antennas some antennas are better at the very low power we use.We need to find this antenna and post it hear so others can get one.Back to that guy down the street from you. I would bet he would hear a nice and loud 75mw station than the same station at 100mw but not as loud so we must push to get our stations as loud as we can and sound good doing it (go back to C.B.Radio and the power mic) and last we must find the best EL-Cheap-oh radios out there test them for there range and yes sale them to the guys down the street.For all you guys who make Trans take one side band out and push all your power into the other like the Power-side from Kahn Communications it will make our 100mw sound like near 400mw down the road and the F.C.C.says you can do that.
 
> No matter what power you run at your station be it 100mw or
> 75mw if the guy down the street got an EL-Cheap-oh radio he
> may not hear you at all.In part15 we must get off this power
> at the station thing.The things we need to work on are our
> antennas some antennas are better at the very low power we
> use.We need to find this antenna and post it hear so others
> can get one.Back to that guy down the street from you. I
> would bet he would hear a nice and loud 75mw station than
> the same station at 100mw but not as loud so we must push to
> get our stations as loud as we can and sound good doing it
> (go back to C.B.Radio and the power mic) and last we must
> find the best EL-Cheap-oh radios out there test them for
> there range and yes sale them to the guys down the
> street.For all you guys who make Trans take one side band
> out and push all your power into the other like the
> Power-side from Kahn Communications it will make our 100mw
> sound like near 400mw down the road and the F.C.C.says you
> can do that.
>
Dave has an SStran, and dosn't use it as a final amplifier because of it's poor power ouput efficiency. The modulation and fidelity are good, but the modulation method impedes output efficiency of the final RF stage. It is INPUT to the final stage that is limited to 100 milliwatts by part 15, but it is OUTPUT that gets the signal on the air. 90+ percentage efficiency and no transmission line losses help a lot. Placing the final RF amp at the antenna avoids transmission line losses, and every milliwatt counts.
3 to 5 miles is possible with 1 transmitter. Dave gets out 3 miles with only one transmitter "on the air". The other 2 transmitters are used to crate additional signal in some directions, ovecoming noisy areas and obstructions. Elevating the "transtenna" (copyright 2005-Richard Franklin) 30 or more feet above the ground greatly reduces ground losses. If the supporting structure is metal, grounded, has another use, and is pre-existing, then the ground can be considered an unintentional radiator. It WILL re-radiate and reinforce the signal by inductive coupling and re-radiation. The additional elevation will reduce ground losses.
Dave McCrork has advised the FCC field engineer for the radio district about the engineering and operation of WNAR-AM.
www.wnar-am.com
-Rich
 
ovecoming noisy areas and obstructions

Hi
would be able to explain how this works?


The other 2 transmitters are used to crate additional signal in some directions, ovecoming noisy areas and obstructions.



thanks

simcha
 
Re: ovecoming noisy areas and obstructions

> Hi
> would be able to explain how this works?
>
>
> The other 2 transmitters are used to crate additional signal
> in some directions, ovecoming noisy areas and obstructions.
>
>
>
>
> thanks
>
> simcha
>
The same as a multi-tower directional antenna system many AM stations use, execept, in this case, there is a separate syncronized transmitter for each antenna, resulting in several times the radiated antenna ouput power.
-Rich
 
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