[BC] Overcrowding & noise floor on AM

[Robert Meuser]

Mark

Is there a link???



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?
>
> Grant Bingeman wrote a paper about this technique way back in 1977; he
> called it a "bandwidth flattener".  It's a bit more complicated than a
> conventional T-network, but offers the transmitter a much flatter
> load.  See also his article in the June 78 edition of BM/E.
>
> 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.
>
> Mark
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