[Lowfer] Medfer Antenna.

[Robert M. Bratcher Jr.]

At 04:08 PM 10/27/2009, you wrote:
>Hi Lee,
>
>The MedFER band is a rarity here on the LowFER List. But some here 
>do more than LFs, though haven't seen their responses, yet.
>
>I understand you wish to BC to the neighborhood only. Shouldn't be 
>too hard. Some answers to your queries:
>
>Part-15 Regs. (as is commonly accepted here) For 1700 KHz band, the 
>10 foot limit would include the "ground connection" wire, if used. 
>So if ground mounted, the radials or GND rod/s don't count. Further 
>it is thought that a top hat (one or more top radial wires that may 
>be connected, say at their ends) can be thought of as a virtual 
>disk, in a plane at rt. angles to the vertical member. Then that 
>disk has a radius and that counts toward the real antenna length. 
>Most think it wise to have a top hat for ant. efficiency.
>
>Keep the loading coil small. If base mounted can also be used to feed the ant.
>
>It's desirable to keep the freq. generation apparatus indoors and 
>only the final at the ant. to minimize it counting for much in the 
>Part-15 length parameter.
>
>Given the 1 Watt input level, pay attention on system efficiencies, 
>loading, matching, final tuning. You'll need some test equipment for that.
>
>Cheers -- Peter

The input level for the AM broadcast band is 100 milliwatts, not one watt!!

>--------------------------------
>
> > Need input.  I have a small legal AM transmitter kit I want to put on the
> > hi end of the AM BC band.  I have a lake house in a small subdivision in
> > the country.  the subdivision is a circle you can walk around in a matter
> > of a few minutes.  My house is near the middle of all this.  I want to
> > legally send out AM on the transmitter with subdivision news.  I would
> > suspect the diameter of the circle is around 1200 to 1500 feet.