Sorry, I find this a wee bit hard to swallow. I picture a big lump of large
toroids, with two plastic pieces of coax jacket going through them, with one
wire in each that connect to the open wire. This conglomeration is serving
some useful purpose? The little RF electrons going NORTH to the antenna are
passed by the gate keeper in the conglomeration? WOW, that's interesting, as
to the little electrons reflected from the antenna he says " no, you can't
pass "! Is there some magic DSP going on here? How does this toroid know all
this? Have toroids become sentient and aware over night? I can see the
scenario when the ( sic ) good RF is on the inside of a coaxial cable and
protected from the toroid by the cable shield, getting to the antenna and
the ( sic ) bad RF, ON THE OUTSIDE OF THE COAX SHIELD, getting stopped when
they are reflected, but the open wire setup looks a little DODGY to ME! This
is the month of APRIL, but not APRIL 1 :-) right ??
FLAME SUIT ON !!
Walt K8CV
----- Original Message -----
From: "Rick - DJ0IP / NJ0IP" <Rick@DJ0IP.de>
To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
Sent: Monday, April 22, 2013 8:53 AM
Subject: Re: [TenTec] Built in SWR meter bannans
Dave,
Sorry, my memory failed me there.
It was long ago that I did this.
I had to search for my notes and drawings (file). Found them.
Actually I removed the center cable from coax, and discarded the shield
and insulation. Then I put two pieces in parallel and ran them through the
same beads; lots of beads.
Then I covered it with heat-shrink tubing and fed the open wire into one
end, and connected the other end through a short coax stub to my antenna
tuner.
So yes, I did use only the center of two pieces of coax, but they ran
through the same string of beads, not separate beads.
73
Rick
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of
d.e.warnick@comcast.net
Sent: Monday, April 22, 2013 1:23 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Built in SWR meter bannans
I don't understand. in coax you are increasing rhe impedence to the common
mode current on the shield, right? What would you be doing on the open
wire?
73
Dave
WA3F
From: "Rick - DJ0IP / NJ0IP" <Rick@DJ0IP.de>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Monday, April 22, 2013 3:15:21 AM
Subject: Re: [TenTec] Built in SWR meter bannans
With openwire you can build a CMC choke just as easily as with coax.
Only thing is, you have to build two of them so it costs twice as much.
In fact you make your own coax CMC choke by placing beads over the coax
and coating with heat-shrink tubing... you can just tape two of these
together and use their center conductors for the connections.
What's in a name? that which we call a rose
by any other name would smell as sweet;
73
Rick, DJ0IP
On 4/21/2013 5:57 PM, Bob McGraw - K4TAX wrote:
Sounds like RF current on the shield when on the antenna and not on
the dummy load. I suggest a 1:1 UNUN balun between the amp and the
antenna. I've had good success with a product from The Wireman being
model #8232. Certainly worth a try.
73
Bob, K4TAX
----- Original Message ----- From: "Jim GM" <jim.gmforum@gmail.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Sunday, April 21, 2013 11:13 AM
Subject: [TenTec] Built in SWR meter bannans
I have a Tec Tec Auto Coupler that is turned off and a Ten Tec
Hercules II at full power. The SWR bridges in side the equipment
reads well over SWR over 3:1 on certain bands while my BIRD Watt
meter read 2:1.
ALL SWR meters is at 1:1 into a dummy load so that rules out the BIRD
is whacked.
This problem seams to mainly happen on 160M however I have seen it do
this on different bands with other antennas in the past.
Are the diodes going into saturation? I am going BANNAS with this
issue.
--
Jim K9TF
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