[BC] Overcrowding & noise floor on AM

[Cowboy]

On Monday 19 March 2007 12:11 pm, Mark Humphrey wrote:
> On 3/19/07, Robert Meuser <Robertm at broadcast.net> wrote:
> > That being said,
> > to a degree bandwidth can be traded for efficiency. I have done some
> > experimentation with 'resistive matching' . It can make a pretty bad
> > looking antenna look at lot better. Of course this is at the cost of
> > efficiency. This is still somewhat about getting what you pay for.\
> 
> How about using a frequency-compensating L-network, with a series LC
> in each leg to "track" the base impedance curve?

 We call that "broad banding" today, and it's common practice.
 ( some work out better than others )

 /snip/

> I was once involved in building an AM station with this type of ATU,
> which allowed the transmitter to see a VSWR better than 1.03 across a
> 20 kHz bandwidth.

 Yup !
 I remember one in Columbus Ohio that ended up with better bandwidth
 on the array than on the Kintronics dummy load !!
 Rare, but it can happen.

-- 
Cowboy