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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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HTML//EN">
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<DIV> </DIV>
<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> 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> </DIV>
<DIV><FONT color=3D#000000 size=3D2>Now I have these questions =
:</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </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> </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> </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> </DIV>
<DIV> </DIV>
<DIV><FONT color=3D#000000 face=3D"Courier New">There is going to be =
interaction=20
between the two 10 meter beams. There are two ways to overcome =
this=20
interaction. You can move the 10 meter KLM down below by more =
than 25=20
or 30 feet. Many of us do this with the antenna fixed on a=20
direction. Or you can try to phase the KLM with the TH7. =
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> </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> </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> </DIV>
<DIV><FONT face=3D"Courier New">Dave K4JRB</FONT></DIV>
<DIV><FONT face=3D"Courier New"></FONT> </DIV>
<DIV> </DIV></DIV></DIV></BLOCKQUOTE></BODY></HTML>
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