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I'm having some tough tvi problems of late. And I am on cable. The =
cable tech
was out today, and he left stumped. He said the incoming signal is good, =
and
I buy that because our picture is really better then it used to be. We =
did get a
new tv a while back, and that may be a lot of it.
We live on a small (120x50) city lot, and my dipole and TH3 are only up =
at=20
40 feet. The dipole is a 40/80/160 W9INN dipole.=20
The biggest problem is on 80 meters. Even at the lowest power setting on =
my
TS 850 (10 watts or so) I still get some cross hatching on both tv sets. =
I did buy
an amp a while back, and this just adds salt to the wounds so to speak. =
So,
it doesn't see much use unless the Xyl is at work and the tv's are off.=20
RF chokes (6" diameter, 12 turns) were put on both the TH3 and the =
dipole.
I might have gained a bit on the TH3. I can run about 300 watts with it =
before
I start having TVI problems. But, the amp is an LK 500zc, so I'd rather =
run
it a bit harder of course. I don't think grounding is an issue. The =
tower is
grounded, and I have another 8ft ground rod right outside the shack and
I run #4 solid into the shack, then tie to it with 2" flat braid that =
goes to the
850, the LK 500 and the ATR 30 tuner.=20
I have put both legs of the dipole out back and it does help quite a bit =
with
TVI. But with the lot only being 50 ft wide I see a noticeable drop in =
tx and
rx when I go that route. I guess if the lowest band I wanted to use was =
40,
I could do that pretty easy. But.... =20
So far, I have tried winding the excess CATV cable into a fair sized =
choke,
no luck there. I have a couple of small ferrites, no luck there either. =
I did=20
read on the Arrl page that a company sells (I assume much larger then I
have) ferrites that you put 15 turns on, and that is supposed to help.=20
The cable tech did try a high pass filter at the tv today. No luck =
there. I
have a brand new high dollar low pass filter that hasn't helped either.=20
I hope this isn't too much info at once. I feel like I have written a =
book here.
Thanks...
73 - Mike K9MI
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<DIV><FONT face=3DArial size=3D2>I'm having some tough tvi problems of =
late. And I=20
am on cable. The cable tech</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>was out today, and he left stumped. He =
said the=20
incoming signal is good, and</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>I buy that because our picture is =
really better=20
then it used to be. We did get a</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>new tv a while back, and that may be a =
lot of=20
it.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>We live on a small (120x50) city lot, =
and my dipole=20
and TH3 are only up at </FONT></DIV>
<DIV><FONT face=3DArial size=3D2>40 feet. The dipole is a 40/80/160 =
W9INN dipole.=20
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>The biggest problem is on 80 meters. =
Even at the=20
lowest power setting on my</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>TS 850 (10 watts or so) I still get =
some cross=20
hatching on both tv sets. I did buy</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>an amp a while back, and this just adds =
salt to the=20
wounds so to speak. So,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>it doesn't see much use unless the Xyl =
is at work=20
and the tv's are off. </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>RF chokes (6" diameter, 12 turns) were =
put on both=20
the TH3 and the dipole.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>I might have gained a bit on the TH3. I =
can run=20
about 300 watts with it before</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>I start having TVI problems. But, the =
amp is an LK=20
500zc, so I'd rather run</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>it a bit harder of course. I don't =
think=20
grounding is an issue. The tower is</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>grounded, and I have another 8ft ground =
rod right=20
outside the shack and</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>I run #4 solid into the shack, then tie =
to it with=20
2" flat braid that goes to the</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>850, the LK 500 and the ATR 30 tuner. =
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>I have put both legs of the dipole out =
back and it=20
does help quite a bit with</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>TVI. But with the lot only =
being 50 ft=20
wide I see a noticeable drop in tx and</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>rx when I go that route. I guess if the =
lowest band=20
I wanted to use was 40,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>I could do that pretty easy. =
But.... =20
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>So far, I have tried winding the excess =
CATV cable=20
into a fair sized choke,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>no luck there. I have a couple of small =
ferrites,=20
no luck there either. I did </FONT></DIV>
<DIV><FONT face=3DArial size=3D2>read on the Arrl page that a company =
sells (I=20
assume much larger then I</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>have) ferrites that you put 15 turns =
on, and that=20
is supposed to help. </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>The cable tech did try a high pass =
filter at the tv=20
today. No luck there. I</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>have a brand new high dollar low pass =
filter that=20
hasn't helped either. </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>I hope this isn't too much info at =
once. I feel=20
like I have written a book here.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Thanks...</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>73 - Mike K9MI</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV> </DIV></BODY></HTML>
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