Hi Dominique,

I doubt that your spreadsheet will give accurate design information for
actual design.
As you already mentioned, it has it's limitations since it will not give
gain, f/b and antenne impedance as
a function of operating frequency.

I have done quite a lot of loop yagi antenna modelling in NEC2 and MMANA and
I found out
that the loop yagi performance is infuenced quite dramatically by the
physical dimensions of the
individual loops and their relative position. I have not mentioned the
effect of the element diameter.

In addition I have built several loop yagi's. Testresult of my 6 element 2m
loop yagi can be
found on the internet (google: loop yagi pe2wdo).

If you are interested I can send some design details of my loopyagi design.

Best regards,

Willem
PE2WDO



"Dominique Michel" schreef in bericht
news:20060805171848.3a8f7cf6@localhost...
Hi all,

I have done a spreadsheet for the calculation of Yagi-Uda array of
loops. You can get it on internet at
http://home.citycable.ch/monde-meilleur/index.html

Sorry it is in french, a direct link to the page where the spreadsheet
reside is:
http://home.citycable.ch/monde-meill...antennes1.html

It is 2 versions, the original one for gnumeric at
http://home.citycable.ch/monde-meill...adres.gnumeric
and another one for excel at
http://home.citycable.ch/monde-meill...multicadre.xls

I have tested the excel version only with openoffice (I use linux at home)
and it worked.

I have done a TV RX antenna on 487.25 MHz with just a few wood stick and
some coaxial cable. It took me 2 hours of job, and I was able to receive
with the color a channel I was just able to receive in black and white and
a lot of snow with the biggest Wisi UHF antenna.

Such an antenna can outperform any commercial antenna. It will just become
bigger as you get down in frequency. As example, a five elements 27MHz
will do 9.5 meter length for a diameter of the active element of 3,89
meters.

Any comments are welcome.
I will appreciate very much If someone can take a look on my English and
correct it. Just drop me a word or two.

Dominique