[Elecraft] RE: AM bandwidth, the rest of the story :=)

[Joe Subich, W4TV]

> I haven't read anyone refer to the antenna bandwidth, perhaps 
> I missed it. 

There are standards - generally requiring the antenna to be 
reasonably well behaved +/- 10 KHz or more - is order to 
support both AM stereo (if used) and "HD (digital) radio"  

> Small, local, transmitters would have "small" antennas with 
> much lower bandwidth than a big transmitter and therefore some 
> additional self-limiting of transmitted bandwidth.

Not necessarily.  Antenna height is driven to a large degree 
by the requirement to maintain specified field strength and 
minimize high angle radiation that causes skywave interference 
within the coverage area. 

> Is the transmitted bandwidth part of the measurements 
> required for broadcast transmitters?

Not specifically for audio response measurements. 

73, 

   ... Joe, W4TV 
 

> -----Original Message-----
> From: David Cutter [mailto:d.cutter at ntlworld.com] 
> Sent: Tuesday, January 15, 2008 6:02 PM
> To: n1al at cds1.net; Joe Subich, W4TV
> Cc: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] RE: AM bandwidth, the rest of the story :=)
> 
> 
> I haven't read anyone refer to the antenna bandwidth, perhaps 
> I missed it. 
> Small, local, transmitters would have "small" antennas with 
> much lower 
> bandwidth than a big transmitter and therefore some 
> additional self-limiting 
> of transmitted bandwidth.
> 
> Is the transmitted bandwidth part of the measurements 
> required for broadcast 
> transmitters?  It would make a lot more sense to me than what 
> is fed to the 
> antenna.
> 
> 
> David
> G3UNA 
> 
> 
>