On Wed, 17 Sep 2008, Bill W5WVO wrote:
Actually, looking at transmission line SWR at the transmitter is a
poor way to adjust an antenna. To get it right, you need to use a
complex impedance analyzer like the now-ubiquitous MFJ-259B (or
equivalant instrument), and put it as close to the
the SWR
through 100 feet of feedline.
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Jessie
Oberreuter
Sent: Thursday, September 18, 2008 2:42 AM
To: Bill W5WVO
Cc: LIST - elecraft; Cranz Nichols
Subject: Re: [Elecraft] K3 - Numeric SWR Display
] [mailto:elecraft-
[EMAIL PROTECTED] On Behalf Of Jessie Oberreuter
Sent: Thursday, September 18, 2008 1:42 AM
To: Bill W5WVO
Cc: LIST - elecraft; Cranz Nichols
Subject: Re: [Elecraft] K3 - Numeric SWR Display
On Wed, 17 Sep 2008, Bill W5WVO wrote:
Actually, looking at transmission line SWR
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Charles Morrison
Since I don't plan on hanging off the side of the tower to operate my
station, isn't it more prudent to tune the entire system, flaws,
feedline and all if my main concern is what SWR my
PROTECTED]
To: LIST - elecraft elecraft@mailman.qth.net
Sent: Thursday, September 18, 2008 8:40 AM
Subject: RE: [Elecraft] K3 - Numeric SWR Display
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Charles
Morrison
Since I don't plan on hanging off the side
That's true. Indeed, if you have an antenna tuner (built-in automatic or
external manual) you don't even need to do that. That's what made them so
popular in recent years; they fix impedance problems at the rig end
without fiddling around with the antenna at all.
The issue then becomes feed line
Hi Charlie:
Since I don't plan on hanging off the side of the tower to operate my
station, isn't it more prudent to tune the entire system, flaws, feedline
and all if my main concern is what SWR my equipment, in my shack, sees?
'Tuning' things so the rig sees what it wants is not always the
On Thu, 18 Sep 2008 09:35:45 -0600, Bill W5WVO wrote:
as feedline losses due to SWR can be
significant on both transmit and receive
It depends on your definition of significant and the degree
of mismatch. This is another one of those old wives' tales
that is a wild exageration of reality. A
Excellent point Joe.
The current QST magazine that features a short article about running open
wire or window line to coax outside the house and then using a short length
of coax to reach the rig. The author noted that with a short run of 10 feet
of the coax he uses, the losses with a 10:1 SWR
On Thu, 18 Sep 2008 09:44:42 -0700, Ron D'Eau Claire [EMAIL PROTECTED]
wrote:
That's true. Indeed, if you have an antenna tuner (built-in automatic or
external manual) you don't even need to do that. That's what made them so
popular in recent years; they fix impedance problems at the rig end
I need to adjust the gamma matches on my 10/15M delta loop.
Is there a way to bypass the internal ATU and have the K3 display the SWR it
sees numerically?
Should dig out my old SWR bridge?
cln
WB5BKL
K3 #231
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Post to:
11:53 PM
Subject: [Elecraft] K3 - Numeric SWR Display
I need to adjust the gamma matches on my 10/15M delta loop.
Is there a way to bypass the internal ATU and have the K3 display the SWR
it sees numerically?
Should dig out my old SWR bridge?
cln
WB5BKL
K3 #231
as you can get for Xc=0,
Xl=0, R=50. You can't do that with an SWR bridge! :-)
Bill W5WVO
- Original Message -
From: Cranz Nichols [EMAIL PROTECTED]
To: LIST - elecraft elecraft@mailman.qth.net
Sent: Wednesday, September 17, 2008 3:53 PM
Subject: [Elecraft] K3 - Numeric SWR Display
I need
: [Elecraft] K3 - Numeric SWR Display
Actually, looking at transmission line SWR at the transmitter is
a
poor way to adjust an antenna. To get it right, you need to use
a
complex impedance analyzer like the now-ubiquitous MFJ-259B (or
equivalant instrument), and put it as close to the antenna
] K3 - Numeric SWR Display
Actually, looking at transmission line SWR at the transmitter is
a
poor way to adjust an antenna. To get it right, you need to use
a
complex impedance analyzer like the now-ubiquitous MFJ-259B (or
equivalant instrument), and put it as close to the antenna
feedpoint
regret it! Greatest thing
since CW killed King Spark. :-)
Bill W5WVO
- Original Message -
From: Bill W5WVO [EMAIL PROTECTED]
Sent: Wednesday, September 17, 2008 4:39 PM
Subject: Re: [Elecraft] K3 - Numeric SWR Display
Actually, looking at transmission line SWR at the transmitter is a
poor
It is best to measure the SWR at the antenna. That ensures the actual SWR on
the feed line (and so feed line losses) are as low as possible.
Using an SWR bridge designed for 50-ohm lines will do the job. When the SWR
bridge reads something close to 1:1 the reactance will, by definition, be
close
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