The myths have been busted 30 years ago. I Recommend reading Walt Maxwell's
Reflections or his series of articles in QST in the early 70's. Or you
can just go to his website w2du.com and read the SWT Mythbuster in action.
Russ, N3CO
- Original Message -
From: Peter Howson [EMAIL
Top banders use RG6 all the time and run full bore (and then some)
through it. At 1 Mhz, it is rated at 4kw.
If you're only interested in 100 watts output (you didn't say what
frequency you operate), you're good to go with RG6 up to 1GHz.
The white stuff is so cheap, you can replace it every 5
, November 13, 2007 6:28 AM
Subject: [Elecraft] OT: pwr rating of RG6, etc
Top banders use RG6 all the time and run full bore (and then some)
through it. At 1 Mhz, it is rated at 4kw.
If you're only interested in 100 watts output (you didn't say what
frequency you operate), you're good to go
You use it because of 2 characteristics. 1) It has lower loss than an
equal physical size 50 ohm cable - and that is true even considering the
added loss due to mismatch. 2) It is conviently available and inexpensive.
Considering the added loss due to a 1.5 SWR, look at the charts. If the
-Original Message-
From: Samuel Strongin [EMAIL PROTECTED]
RG6 is 75 ohm cable. Why would you buy a great radio and worry about
performance,then go use the wrong cable. You start out at a 1.5:1 swr.
Because RG-6 may not be the wrong cable, and the SWR may not be 1.5
to 1.
IMHO, the
] OT: pwr rating of RG6, etc
You use it because of 2 characteristics. 1) It has lower loss than an
equal physical size 50 ohm cable - and that is true even considering the
added loss due to mismatch. 2) It is conviently available and
inexpensive.
Considering the added loss due to a 1.5 SWR
as antenna.
- Original Message -
From: Don Wilhelm [EMAIL PROTECTED]
To: Samuel Strongin [EMAIL PROTECTED]
Cc: DOUGLAS ZWIEBEL [EMAIL PROTECTED]; elecraft@mailman.qth.net
Sent: Tuesday, November 13, 2007 9:10 AM
Subject: Re: [Elecraft] OT: pwr rating of RG6, etc
You use it because
A couple of points:
1 -- While the feedline might have a 1.5:1 swr, a tuner at the rig can
allow the rig to see it as 1.0:1.
2 -- If the feedpoint of the antenna has an impedance close to 75
ohms, RG-6 would be the _correct_ feedline to use. (Correct meaning
best match to the antenna and lowest
KR2Q penned: Top banders use RG6 all the time and run full bore (and then some)
through it. At 1 Mhz, it is rated at 4kw.
Doug, where did you find that spec?
From what I know, most flavors of RG6 lack the voltage rating to
instill confidence in putting a lot of power down the line. Yes,
At 10:16 AM 11/13/2007, Samuel Strongin wrote...
just use the cheapest piece of junk and try to justify it. The fact of
the matter 1.5 does matter.For example Icom radios fold back when
seeing a swr of 1.5 to one.
Remind me to never buy an Icom. Who would want a radio which can't be
used
Actually, I've found Icoms to be much more tolerant of SWR issues then
Yaesu. When you consider that most (90% or more?) recent rigs have
built in antenna tuners that can match up to 150 ohms minimum, the idea
of 72 VS: 52 seems trivially unimportant.
Mike S wrote:
At 10:16 AM 11/13/2007,
I have been following this thread and find it very interesting, particularly
as a Mechanical Engineer I have to read it slowly but may I comment --
1, I don't know the details of Icom's protection system, but the ones I have
seen sense reflected power, well actually it will be the voltage
Peter (and interested others),
You might want to peruse the article Antennas, Transmission Lines, and
Tuners at my website http://w3fpr.qrpradio.com.
The article tries to flatten several myths in terms that should be
understood by most hams - no math, but I believe a good explanation of
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