[BC] AM RF challenges

[DHultsman5@aol.com]

In a message dated 4/26/2007 10:31:45 AM Central Daylight Time, 
RichardBJohnson at comcast.net writes:
Some directional antenna systems needed to use a built-in resistor
for attenuation to control field intensity in the days when
transmitters were required to operate at their rated power. Now they
use trees.
--
Cheers,
Richard B. Johnson

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

Now they use trees,  changes in conductivity,  lossy front ends on 
receivers,  interfering noises from power lines, outlighting 
ballasts, floursecent light, neon light, zeon lights, halon lights, 
computer microprocessors, cellular telephones interfing with 
windshield antennas in the AM band.  Eveyuthing has changes on the 
receive side.  The only things that have changed on the transmitt 
side,  not required fixed input power using RF resistors in common 
points,  any power on any channel that the channel will accept 
excluding the old Class IV locals,  PSSA and PSA authorities.  A few 
changes in 87 years of AM broadcasting.   AH digital or not to 
digital, that is the question?

Dave