[TowerTalk] Fwd: Method of calculating phase delay variation

[Patrick Greenlee]

Technically correct, Hans but where are those constructive interference 
energies directed ? I think not in any useful directions desired for normal 
ham use. I suppose I should have made it clear I was considering 
close/minimal spacing but didn't.  Sorry.  My bad.

Patrick AF5CK

-----Original Message----- 
From: Hans Hammarquist
Sent: Tuesday, September 03, 2013 5:37 PM
To: towertalk at contesting.com
Subject: [TowerTalk] Fwd: Method of calculating phase delay variation

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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