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David,
Yes, you may combine the feedlines to antennas on different towers, but will
prpbably not see any improvement in signal strength one over the other at
the heights you mention. A high antenna and a low antenna on different
towers might show one better over the other due to arrival/takeoff angles
based on band condx. (See my homepage. I have a 10M beam @ 149 ft on one
tower and an identical antenna on another tower @ 52 ft. The towers are 125
ft apart).
BTW, K3MM uses a three stack of KT-34XAs. I don't recall the heights.
The reason the antennas must be in the same vertical plane and separated by a
distance, X, (as is discussed by W2PV in his book) to see any stacking gain
is due to ground reflection and subsequent pattern enhancement due thereto.
A good source for you to read is: Yagi Antenna Design, by Dr. James L.
Lawson, W2PV, published by ARRL. Chapter 6 discusses stacking Yagis in
detail.
I will discuss, on my homepage, the stacking decision I made, the modelling
of the antennas, and the implementation . I am adding to the site every
week. Check back frequently:
http://www.erols.com/n3rr
Bill Hider, N3RR
N3 Ring Rotor
http://www.erols/n3rr
Authorized TIC Representative
DavidC wrote:
> I am acquiring two used KT34XA's (instead of the TH7 and TH6DXX). I am
> considering either stacking them on a single tower or placing them on
> separate towers where they will be at about 40 feet and 50 feet above dry
> gravely rocky ground.
> I see in the KLM FAQ that stacked and phased KT34XA's on a single tower
> must be over 35 feet apart! Wow! & why?
> Can two KT34XA's be combined if on different towers at different heights?
> The towers will be about 50 feet apart I believe.
> Thanks & 73, DavidC AA1FA
>
> --
> FAQ on WWW: http://www.contesting.com/towertalkfaq.html
> Submissions: towertalk@contesting.com
> Administrative requests: towertalk-REQUEST@contesting.com
> Problems: owner-towertalk@contesting.com
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David,
<P>Yes, you may combine the feedlines to antennas on different towers,
but will prpbably not see any improvement in signal strength one
over the other at the heights you mention. A high antenna
and a low antenna on different towers might show one better over the other
due to arrival/takeoff angles based on band condx. (See my homepage.
I have a 10M beam @ 149 ft on one tower and an identical antenna on another
tower @ 52 ft. The towers are 125 ft apart).
<P>BTW, K3MM uses a three stack of KT-34XAs. I don't recall the heights.
<P>The reason the antennas must be in the same vertical plane and separated
by a distance, X, (as is discussed by W2PV in his book) to see any
stacking gain is due to ground reflection and subsequent pattern enhancement
due thereto. A good source for you to read is: Yagi Antenna Design,
by Dr. James L. Lawson, W2PV, published by ARRL. Chapter 6 discusses
stacking Yagis in detail.
<P>I will discuss, on my homepage, the stacking decision I made, the modelling
of the antennas, and the implementation . I am adding to the site
every week. Check back frequently:
<P><A HREF="http://www.erols.com/n3rr";>http://www.erols.com/n3rr</A>
<P>Bill Hider, N3RR
<BR><B><FONT COLOR="#FF0000">N3 R</FONT></B>ing <B><FONT
COLOR="#FF0000">R</FONT></B>otor
<BR><A HREF="http://www.erols/n3rr";>http://www.erols/n3rr</A>
<BR><B><FONT COLOR="#3366FF">Authorized TIC Representative</FONT></B>
<BR>
<P>DavidC wrote:
<BLOCKQUOTE TYPE=CITE>I am acquiring two used KT34XA's (instead of the
TH7 and TH6DXX). I am
<BR>considering either stacking them on a single tower or placing them
on
<BR>separate towers where they will be at about 40 feet and 50 feet above
dry
<BR>gravely rocky ground.
<BR>I see in the KLM FAQ that stacked and phased KT34XA's on a single tower
<BR>must be over 35 feet apart! Wow! & why?
<BR>Can two KT34XA's be combined if on different towers at different heights?
<BR>The towers will be about 50 feet apart I believe.
<BR>Thanks & 73, DavidC AA1FA
<P>--
<BR>FAQ on
WWW:
<A
HREF="http://www.contesting.com/towertalkfaq.html";>http://www.contesting.com/towertalkfaq.html</A>
<BR>Submissions:
towertalk@contesting.com
<BR>Administrative requests: towertalk-REQUEST@contesting.com
<BR>Problems:
owner-towertalk@contesting.com
<BR>Search:
<A
HREF="http://www.contesting.com/km9p/search.htm";>http://www.contesting.com/km9p/search.htm</A></BLOCKQUOTE>
</HTML>
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FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
Search: http://www.contesting.com/km9p/search.htm
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