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

[Dana Puopolo]

It will be the NAB that's yelling the loudest...

-D


------ Original Message ------
Received: Wed, 19 Jul 2006 09:36:17 AM EDT
From: "Bailey, Scott" <SBailey at nespower.com>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Subject: RE: [BC] LPAM (was Smallest AM Radiator/TIS)

Dave,
  Then, what would it take, "an act of congress" to force the commission
to change the rules in part 15 AM?  I think that a full 1/2 watt would
be o.k. for Part 15, but I'm sure somebody will yell, INTERFERENCE! MAKE
THEM TURN IT OFF!

Scott

-----Original Message-----
From: broadcast-bounces at radiolists.net
[mailto:broadcast-bounces at radiolists.net] On Behalf Of
DHultsman5 at aol.com
Sent: Wednesday, July 19, 2006 8:23 AM
To: broadcast at radiolists.net
Subject: Re: [BC] LPAM (was Smallest AM Radiator/TIS)

 
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  



*************************************************************
 
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
 
 
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