"Dimitris" wrote in news:1134575594.448347.204420
@z14g2000cwz.googlegroups.com:

Mr Dave

Can you mention the process that you followed
(programs that you used, in what frequency, wire's radius,
value for the conductivity etc)
in order to make this analysis?

I am surpised that you've found this value
for the input impedance, which is so different
from the one I calculated.

Finally, can you explain what you mean by
finding 93.1% resonance of the antenna?

I modelled it in MMANA (I said poor tools, remember), using the standard
..8mm wires and free space (no ground).

Then I moved the frequency and recalculated the pattern and impedance
until it became resistive at the terminals. That happened at a frequency
93.1% of what the full quarter-wave frequency would have been. And at
that frequency, the impedance was a resistive 75 ohms. In other words,
it resonates lower than the design frequency (hence the lower
resistance).

I started with 900mhz and ended up with 837.9, if I remember. I didn't
save it.


--
Dave Oldridge+
ICQ 1800667