On 8/12/2013 9:32 AM, James Rodenkirch wrote:
Does it matter which twisted pair of wires I use?
The Zo of all pairs is the same, to manufacturing tolerances, but each
pair has a different twist ratio (called the lay). This is done to
minimize crosstalk between pairs. A higher twist ratio
I believe that if you parallel two twisted pairs of a CAT5 cable, you'll
have a 50 ohm transmission line.(Each twisted pair is 100 ohms). I've tried
this with CAT5e cable and find it works well, even for transmitting, up to
about 100W. The VSWR match was very close to 50 ohms. The problem is
Well, Jim, here is what N4IS stated (bolded words my emphasis) - looks like he
found the twisted pair to reduce the noise OR am I reading it incorrectly? Or
are there two different noises being discussed???
www.t6lg.com
The noise level was unbearable for low bands, Ilian was not able
On 8/12/2013 9:46 AM, James Rodenkirch wrote:
Well, Jim, here is what N4IS stated (bolded words my emphasis) - looks like he
found the twisted pair to reduce the noise
Yes, but there's a bit more to it. Twisted pair, by its nature,
minimizes noise pickup. That rejection is maximized if the
Jim,
I completely agree with Jim Brown! I noted those 2:1 transformers the other
day and meant to send you a note to say that I wouldn't bother! That
little bit of mismatch loss won't make any difference!
73,
Charlie, K4OTV
-Original Message-
From: Topband
OH...okee dokee on not needing the 2:1 xfmr
From: charlie-cunning...@nc.rr.com
To: j...@audiosystemsgroup.com; topband@contesting.com
Date: Mon, 12 Aug 2013 17:12:59 -0400
Subject: Re: Topband: CAT5 twisted pair
Jim,
I completely agree with Jim Brown! I noted those 2:1 transformers
Well, I have the wiring scheme all written out and plan on labeling each
connection and checking twice and three times b4 soldering up the connection
boxes and then connecting to the loop itself.great dialogue, fellas. Thank
you ALL so much!!!
Great learning experience, trust me --
J
From: James Rodenkirch [mailto:rodenkirch_...@msn.com]
Sent: Monday, August 12, 2013 6:04 PM
To: Charlie Cunningham; j...@audiosystemsgroup.com; topband@contesting.com
Subject: RE: Topband: CAT5 twisted pair
OH...okee dokee on not needing the 2:1 xfmr
From:
Well, we're mostly all 'ol farts, Jim, but the alternative is GRIM!
73,
Charlie. K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of James
Rodenkirch
Sent: Monday, August 12, 2013 6:08 PM
To: JC N4IS; j...@audiosystemsgroup.com;
Sent via BlackBerry by ATT
-Original Message-
From: Bruce k...@myfairpoint.net
Sender: Topband topband-boun...@contesting.com
Date: Mon, 12 Aug 2013 13:42:17
To: topband@contesting.com
Subject: Topband: Zo of an individual CAT5 twisted pair
I am using a twisted pair, with shield,
When asked, these days, how my day is going, Charlie, I respond with, Going
great 'cuz I am on the green side of the grass!
From: charlie-cunning...@nc.rr.com
To: rodenkirch_...@msn.com; n...@comcast.net; j...@audiosystemsgroup.com;
topband@contesting.com
Date: Mon, 12 Aug 2013 18:18:28
Maybe I'm too easily entertained, but I think it would be fun to try 1500W+
through it on 160 sometime. Years ago, I did that with RG-58C/U on 10
meters. Just because I could. :-)
Not that I plan on using CAT5 cable for anything except my LAN here, but it
might actually surprise us. I've ran over
Seldom mentioned and worth repeating. The L has a bit of high angle
radiation which can be useful at times. The T cancels it.
Carl
KM1H
- Original Message -
From: Mike Waters mikew...@gmail.com
To: topband topband@contesting.com
Sent: Saturday, August 10, 2013 5:48 PM
Subject: Re:
Thanks everyone for all the replies.
I guess that I will work on several things now for the next winter season.
First is the standby length of wire to use as an inverted L which I used as
a fan vertical last winter.
Second I will also play with the coil loading on the 80m vertical and do
All,
I have 160m inverted L and the only way I can get a 500' plus beverage
out to the NE/SW is over top of the radials that are on the ground. In
my research it looks like I'm inviting RF to be induced into the L's
feedline and back into my ICOM 756 PROIII.Not good. Does anyone
know
Tonight was a perfect example of that. N2RK called CQ DX for the longest
time, and he had a great S/N ratio from multiple stations on the RBN,
including GW8IZR. I spotted him on the cluster, and so did HK1MW (Good
copy northen Colombia). He was two or three S-units above the lightning
QRN here,
http://www.ok1rr.com/index.php/technical-topics/39-yet-another-front-end-saver
Date: Sun, 11 Aug 2013 17:15:47 -0400
From: a...@aol.com
To: topband@contesting.com
Subject: Topband: Beverage over Inverted L
All,
I have 160m inverted L and the only way I can get a 500' plus beverage
out
Back-to-back diodes and series lamps help, too.
73, Mike
www.w0btu.com
_
Topband Reflector
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