[TowerTalk] TH7 + KLM 10 meters

thompson@mindspring.com thompson@mindspring.com
Tue, 6 Oct 1998 13:19:30 -0400


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    Carlo Audone asked
   =20
    Hi,
        I have a tower 77 feet high and a Hy-gain TH7 on it. I have =
mounted a KLM 6 elements for 10 meters under the th7. Between the two =
antennas there are about 10 feet.=20
    I have two problems:=20
   =20
    Now I have these questions :
    =20
    1) The lowest SWR that I have on the KLM is 1.5.I have lowered and =
checked the antenna several times but the SWR is still high. I have =
tried with 18 feet between the two antennas but SWR is always the same
    2) On the air (on 10 meters) there is not difference between the klm =
and the TH7. Is the TH7 that work very well on 10 meters or the KLM does =
not work well ?
    =20
    I don't know what to do and the cqww contest is near !!
    =20
    Thank you
    --------------------------end of original message=20
   =20
    There is going to be interaction between the two 10 meter beams.  =
There are two ways to overcome this interaction.  You can move the 10 =
meter KLM down below by more than 25 or 30 feet.  Many of us do this =
with the antenna fixed on a direction.  Or you can try to phase the KLM =
with the TH7.  The KLM would be 1/2 to 1 wavelength away and properly =
phased.
   =20
    Even with the beams 30 feet distance and not phased there is going =
to be some interaction to both the pattern and SWR.
   =20
    The TH7 is a good performer on 10 so perhaps a 40 meter beam or WARC =
beam might be a other alternatives.
   =20
    Dave K4JRB
   =20


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<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 solid 2px; MARGIN-LEFT: 5px; PADDING-LEFT: =
5px">
    <DIV><FONT face=3DArial size=3D2>Carlo Audone asked<BR></DIV></FONT>
    <DIV>
    <DIV>
    <DIV><FONT color=3D#000000 size=3D2>Hi,</FONT></DIV>
    <DIV><FONT color=3D#000000 size=3D2>&nbsp;&nbsp;&nbsp; I have a =
tower 77 feet=20
    high and a Hy-gain TH7 on it. I have mounted a KLM 6 elements for 10 =
meters=20
    under the th7. Between the two antennas there are about 10 feet.=20
    </FONT></DIV>
    <DIV><FONT color=3D#000000 size=3D2>I have two problems: =
</FONT></DIV>
    <DIV>&nbsp;</DIV>
    <DIV><FONT color=3D#000000 size=3D2>Now I have these questions =
:</FONT></DIV>
    <DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT color=3D#000000 size=3D2>1) The lowest SWR that I have on =
the KLM is=20
    1.5.<FONT color=3D#000000 size=3D2>I have lowered and checked the =
antenna=20
    several times but the SWR is still high. </FONT></FONT><FONT =
color=3D#000000=20
    size=3D2>I have tried with 18 feet between the two antennas but SWR =
is always=20
    the same</FONT></DIV>
    <DIV><FONT color=3D#000000 size=3D2>2) <FONT color=3D#000000 =
size=3D2>On the air (on=20
    10 meters) there is not difference between the klm and the TH7. =
</FONT>Is=20
    the TH7 that work very well on 10 meters or the KLM does not work =
well=20
    ?</FONT></DIV>
    <DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT color=3D#000000 size=3D2>I don't know what to do and the =
cqww contest=20
    is near !!</FONT></DIV>
    <DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT color=3D#000000 size=3D2>Thank you</FONT></DIV>
    <DIV><FONT color=3D#000000 size=3D2></FONT><FONT color=3D#000000=20
    face=3D"Courier New">--------------------------end of original=20
    message</FONT>&nbsp;</DIV>
    <DIV>&nbsp;</DIV>
    <DIV><FONT color=3D#000000 face=3D"Courier New">There is going to be =
interaction=20
    between the two 10 meter beams.&nbsp; There are two ways to overcome =
this=20
    interaction.&nbsp; You can move the 10 meter KLM down below by more =
than 25=20
    or 30 feet.&nbsp; Many of us do this with the antenna fixed on a=20
    direction.&nbsp; Or you can try to phase the KLM with the TH7.&nbsp; =
The KLM=20
    would be 1/2 to 1 wavelength away and properly phased.</FONT></DIV>
    <DIV><FONT color=3D#000000 face=3D"Courier New"></FONT>&nbsp;</DIV>
    <DIV><FONT face=3D"Courier New">Even with the beams 30 feet distance =
and not=20
    phased there is going to be some interaction to both the pattern and =

    SWR.</FONT></DIV>
    <DIV><FONT face=3D"Courier New"></FONT>&nbsp;</DIV>
    <DIV><FONT face=3D"Courier New">The TH7 is a good performer on 10 so =
perhaps a=20
    40 meter beam or WARC beam might be a other =
alternatives.</FONT></DIV>
    <DIV><FONT face=3D"Courier New"></FONT>&nbsp;</DIV>
    <DIV><FONT face=3D"Courier New">Dave K4JRB</FONT></DIV>
    <DIV><FONT face=3D"Courier New"></FONT>&nbsp;</DIV>
    <DIV>&nbsp;</DIV></DIV></DIV></BLOCKQUOTE></BODY></HTML>

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