[BC] Freq agile AM transmitters

[Phil Alexander]

On 24 Apr 2007 at 16:45, RichardBJohnson at comcast.net wrote:

> No. You will be going through your usual antenna coupler. It will 
> provide sufficent harmonic suppression,
> i.e., 43 + 10 log (power in watts), especially considering your 
> harmonics will already be 40 dB down.

If that is true, why not eliminate the required, annual 
NRSC test in 73.45? In fact, why did they put in the rules?
Moreover, why do some stations fail the annual NRSC until
maintenance is done?

Answering my own questions, perhaps the idea that an ATU will
serve as a spur and harmonic attenuator is optimistic.

---------------------------------------------
Phil Alexander, CSRE, AMD
Broadcast Engineering Services and Technology 
(a Div. of Advanced Parts Corporation) 
Ph. (317) 335-2065   FAX (317) 335-9037