[BC] LPAM (was Smallest AM Radiator/TIS)

[DHultsman5@aol.com]

In a message dated 7/19/2006 7:15:37 A.M. Central Standard Time,  
rfry at adams.net writes:

>>  Rule 15.209  does not define anything about tx power or  antenna
>> system gain/efficiency, only that the peak field strength  in
>> microvolts/meter when measured 30 meters away from  the
>> antenna cannot exceed [24,000/Operating Freq in   kilohertz].

Phil Alexander responded:
>I had to read that one  myself. ...Operation on 600 kHz is permitted
> twice the FI as on 1200  kHz while, in fact, it should be the opposite
> to account for  propagation attenuation which is far greater at
>1200 kHz than at 600  kHz.
____________

However the useful fields permitted under 15.209  in the AM broadcast band 
are gone long before ground conductivity plays a  significant part in them, 
no matter what the frequency.

RF  



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Similar to the old college radio carrier current stations.  This is  why many 
of them were on the low band clear channel stations 660,640,670 700  etc.  I 
you couldn't hear them normally you would use them for your carrier  current 
frequency because you were allowed to radio a distance of 15  microvolts/per 
meter.   This made it nearly two hundred feet from a  power line at 640 kHz. as 
I recall from KSMU days in Dallas.  
 
Dave Hultsman