[TowerTalk] Fwd: Method of calculating phase delay variation

[Hans Hammarquist]

Even vertical antennas, mounted one above the other and fed out-of-phase still have directions with constructive interference, that is directions with radiation.


Bob's demonstration with out-of-phase speakers sounds awful as we are watching a wide-band signal, speech unlike the RF signals from a radio transmitter that is almost monochrome. The same reason you see all these beautiful patterns from a LASER beam.


Hans - N2JFS



-----Original Message-----
From: Patrick Greenlee <patrick_g at windstream.net>
To: K7LXC <K7LXC at aol.com>; towertalk <towertalk at contesting.com>; k2cb <k2cb at comcast.net>
Sent: Tue, Sep 3, 2013 12:07 pm
Subject: Re: [TowerTalk] Method of calculating phase delay variation



"Imagine your antennas canceling each other out."


Cancellation would not happen in all directions, just some "lobes."  Unless 
of course there were special circumstances such as vertical antennas mounted 
one above the other and fed out of phase.

Patrick AF5CK


-----Original Message----- 
From: K7LXC at aol.com
Sent: Tuesday, September 03, 2013 10:28 AM
To: towertalk at contesting.com ; k2cb at comcast.net
Subject: Re: [TowerTalk] Method of calculating phase delay variation

Howdy --

    First, one of my ham rules is "Go with what  you've got" so I was glad
to see Gerald's, K5GW, comments on feeding both of  your antennas. Try it
and see what happens.

    OTOH the potential problems with out-of-phase  antennas can be
disastrous. Bob Heil's , K9EID, dramatic demonstration  of out-of-phase 
speakers
(another propagation device) will give you  pause to maybe pursue  more 
precise
phasing. (The sound disappears  when they are out of phase. Imagine your
antennas canceling each other  out.)

Cheers,
Steve      K7LXC
TOWER TECH

PS - I followed Bob's talk at the W9DXCC convention some years  ago and he
is a hard act to follow!

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