Re: NEC-LIST: Fw: Lambda/4 monopoles lambda/4 apart (erratum)

At 10:58 AM -0700 9/22/03, Chuck Counselman wrote:
>...Feed the monopoles with equal-magnitude, quadrature-phased, currents by
>...(2) connecting a transmission line (use the TL command) from the
>fed segment (second from the bottom) of each monopole to the same,
>one, new, very short (0.001 wl or less) segment, located anywhere
>that's legal;
>
>(3) giving these two transmission lines equal characteristic
>impedances (Zo = 1 ohm will do), and making both their electrical
>lengths equal to 90 degrees at the operating frequency; and
>
>(4) putting a source (a voltage source will do) in the
>aforementioned, new, very short segment (to which both TL's) connect.

OOPS! Sorry; I forgot for a moment that you want quadrature phasing
of your feedpoint currents.

Amend the above-quoted steps (2) and (4) to read as follows. I
reproduce step 3 for convenience.

(2) connecting a transmission line (use the TL command) from the fed
segment (second from the bottom) of each monopole to a separate one
of two new, very short (0.001 wl or less) segments, located anywhere
that's legal;

(3) giving these two transmission lines equal characteristic
impedances (Zo = 1 ohm will do), and making both their electrical
lengths equal to 90 degrees at the operating frequency; and

(4) putting a voltage source in each of the aforementioned two, new,
very short segments (to which the TL's connect), making the voltage
magnitudes equal and the phases different by 90 degrees.

-Chuck, W1HIS

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