Re: NEC-LIST remarks on folded monopoles for MW

Sylvio Damiani wrote:
>
> I'm a brazilian consultant and field engineer for broadcast
> transmition. I have been dealing with folded unipoles for at least
> three years and I have to disagree with Hal Smith about the
> performance of this MW antenna.
>
> Every folded unipole I worked with (no exception) performed
> surprisingly well! It presents an extremely good coverage and mostly
> important, the reception signal seems to be smooth in the entire
> coverage area, I mean there are no fail of signal between high
> downtown buildings for example, as is very common in large cities of
> this country like Sao Paulo and Rio.
>
> It seems to me that the great difference is the way I'm doing the
> folded unipoles.... [detailed description deleted]

Dear Sylvio,

I concur, the way RAI and you are doing Unipoles is very different
than what I'm seeing here. I'm dealing with buried radials (in unknown
condition) and very small towers with usually a three wire cage.
Apparently the losses get very large under these conditions. Lossy
ground and radiators are difficult to model!

Sincerely,

Hal Smith
Received on Tue Apr 28 07:48:21 MET 1998