Tom
How did you check all your connections?
The only sure way is with a megger.
73
David W Wood
-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Tom Behler
Sent: Sunday, February 21, 2016 4:30 AM
To: [log in to unmask]
Subject: Next RFI Update, and question for Tom: WA6IVG
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Hi, all.
I thoroughly checked all of my coax jumpers in the shack for continuity, and
all looked good. But, RFI issues still occurred.
I then found a few small RG9913 jumpers I had lying around, and actually had
two snap-on RF chokes that could accommodate that size of coax. Put one at
the output of the TS590, and the other between the output of my MFJ998
auto-tuner, and the common connector on my six-position Alpha Delta antenna
switch. Still no joy.
Now, I have a question for Tom: (WA6IVG):
In your last post with the subject of "shielded ground", you posed a
possible solution for an in-the-shack common ground. You said:
How about a piece of coax as ground wire with center conductors used as the
actual ground.
Now take the coax and wind a common mode choke in it at each end, but do
nothing with the shield at the top and ground the shield at the bottom."
I'm a bit confused: where exactly would you connect both ends of this new
grounding cable made out of coax? Obviously, one end would go to the common
ground connection on my feed-through panel, but I'm not sure where the other
end would go. Also, how would you ground the shield at the other end of the
cable? And, what would you recommend for the size of the common mode chokes
on each end?
I have some extra coax here that I'd be willing to try this with sometime
tomorrow.
Tom Behler: KB8TYJ
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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal>Hi, =
all.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>I thoroughly checked all of my coax jumpers in the =
shack for continuity, and all looked good. But, RFI issues still =
occurred.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>I then found a few small RG9913 jumpers I had lying =
around, and actually had two snap-on RF chokes that could accommodate =
that size of coax. Put one at the output of the TS590, and the =
other between the output of my MFJ998 auto-tuner, and the common =
connector on my six-position Alpha Delta antenna switch. Still no =
joy.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>Now, I have a question for Tom: =
(WA6IVG):<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>In your last post with the subject of “shielded =
ground”, you posed a possible solution for an in-the-shack common =
ground. You said:<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoPlainText>How about =
a piece of coax as ground wire with center conductors used as the actual =
ground. <o:p></o:p></p><p class=3DMsoPlainText>Now take the coax and =
wind a common mode choke in it at each end, but do nothing with the =
shield at the top and ground the shield at the =
bottom.”<o:p></o:p></p><p =
class=3DMsoPlainText><o:p> </o:p></p><p =
class=3DMsoPlainText>I’m a bit confused: where exactly would =
you connect both ends of this new grounding cable made out of =
coax? Obviously, one end would go to the common ground connection =
on my feed-through panel, but I’m not sure where the other end =
would go. Also, how would you ground the shield at the other end =
of the cable? And, what would you recommend for the size of the =
common mode chokes on each end?<o:p></o:p></p><p =
class=3DMsoPlainText><o:p> </o:p></p><p class=3DMsoPlainText>I have =
some extra coax here that I’d be willing to try this with sometime =
tomorrow.<o:p></o:p></p><p class=3DMsoPlainText><o:p> </o:p></p><p =
class=3DMsoPlainText>Tom Behler: KB8TYJ<o:p></o:p></p><p =
class=3DMsoPlainText><o:p> </o:p></p><p =
class=3DMsoPlainText><o:p> </o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p></div></body></html>
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