On Tue,3/29/2016 7:40 AM, Mike Waters wrote:
Interesting! I had no idea that anything was available with that capability.
And the AIM2180 is not even the best (or the cheapest) of the units that
do it. The winner, by far, is the VNWA 3e. Less than $700 with shipping
cables, case, and
Interesting! I had no idea that anything was available with that capability.
73, Mike
www.w0btu.com
On Tue, Mar 29, 2016 at 8:49 AM, Guy Olinger K2AV
wrote:
> THIS is the way that you do it. The newer graphing boxes (most of them
> since AIM4170) will allow you to
THIS is the way that you do it. The newer graphing boxes (most of them
since AIM4170) will allow you to pre-calibrate a transmission line, and
then see all results as if you were really up there.
Get an instrument (they are getting less and less expensive) that will
graph R and X (both below and
On Mon,3/28/2016 10:29 PM, Henk PA5KT wrote:
You can calibrate it with your feedline connected so you do real
antenna measurement.
One point of clarification. If you make a measurement that accurately
provides magnitude and phase, including the SIGN of the phase, then
accurately determine
Hi,
I use a miniVNA pro with bluetooth Bluevna software to my Android
smartphone or tablet.
You can calibrate it with your feedline connected so you do real antenna
measurement.
73 Henk PA5KT
Op 3/27/2016 om 21:08 schreef dick.bingham:
Greetings All
I am getting fed up with multiple
"Richard (Rick) Karlquist" wrote:
> I don't believe the above assertion.
> Can anyone give a specific example of an antenna having
> an SWR at the resonant frequency, (where X=0), that is higher than
> the SWR at frequencies slightly above or below the resonant
On 3/28/2016 9:14 AM, Jim Brown wrote:
On Mon,3/28/2016 4:37 AM, KE1F Lou wrote:
Is the lowest SWR is the resonant frequency?
Resonant frequency is when Xl=Xc.
When Xl=Xc is not necessarily the lowest SWR.
Exactly right. If, for example, the antenna's feedpoint impedance at
resonance is
I recently purchased an MFJ 225 two port handheld mini VNA for $269.
http://www.mfjenterprises.com/Product.php?productid=MFJ-225
I do not own more expensive gear to test its calibration against, but so
far it appears accurate both for measuring Xl and Xc, SWR and also doing
frequency sweeps for
On Mon,3/28/2016 4:37 AM, KE1F Lou wrote:
Is the lowest SWR is the resonant frequency?
Resonant frequency is when Xl=Xc.
When Xl=Xc is not necessarily the lowest SWR.
Exactly right. If, for example, the antenna's feedpoint impedance at
resonance is different from the feedline impedance, or
k.bing...@gmail.com>
To: topband@contesting.com
Sent: Sunday, March 27, 2016 7:08:09 PM
Subject: Topband: Handheld Impedance Analyzer
Greetings All
I am getting fed up with multiple trips between new antenna matching
stations and the
tx-source/VSWR and not converging on a good match in quick order !
Ple
Grant has a good list of possibilities in his post. Some newer ones I
haven't tried yet.
SWR is an extremely limited measurement to analyze antennas. I have had
many correspondences with hams led off on a wild goose chase by SWR
measurements. With their MFJ 259's etc, I have them create graphs of
r I've
ever owned.
73
Frank
W3LPL
- Original Message -
From: "dick.bingham" <dick.bing...@gmail.com>
To: topband@contesting.com
Sent: Sunday, March 27, 2016 7:08:09 PM
Subject: Topband: Handheld Impedance Analyzer
Greetings All
I am getting fed up with multiple trips betwee
> To: topband@contesting.com
> Sent: Sunday, March 27, 2016 7:08:09 PM
> Subject: Topband: Handheld Impedance Analyzer
>
> Greetings All
>
> I am getting fed up with multiple trips between new antenna matching
> stations and the
> tx-source/VSWR and not converging on a goo
Try SARK-110
http://www.sark110.com/home
beats others mostly hands down.
73,
Martin, OK1RR
Dne 27.3.2016 v 21:08 dick.bingham napsal(a):
Greetings All
I am getting fed up with multiple trips between new antenna matching stations
and the
tx-source/VSWR and not converging on a good match in
On 3/27/2016 12:08 PM, dick.bingham wrote:
73 Dick/w7wkr CN97uj
Most or all of these devices are intolerant of
strong AM BCB signals. If you have BCB stations
within 10 or 15 miles, try to borrow one to see
if it works for your situation before buying
one. If you buy one, try to get
Hi Dick,
I have an AA-54 and its the best hand held antenna analyzer I've
ever owned.
73
Frank
W3LPL
- Original Message -
From: "dick.bingham" <dick.bing...@gmail.com>
To: topband@contesting.com
Sent: Sunday, March 27, 2016 7:08:09 PM
Subject: Topband: Ha
On Sun, Mar 27, 2016 at 2:40 PM, Jim Brown
wrote:
> I don't have time to write off-list replies to questions that have general
> interest, so I'm responding on the list.
Same here. :-)
My "quick and dirty antenna analyzer is still a 10+ year old MFJ-259B. I
> also
On Sun,3/27/2016 12:08 PM, dick.bingham wrote:
I certainly do not want to restart this topic but new stuff is becoming
available and I don't want to settle for second best if 'best' is not 2X more
costly!
I don't have time to write off-list replies to questions that have
general interest,
Greetings All
I am getting fed up with multiple trips between new antenna matching stations
and the
tx-source/VSWR and not converging on a good match in quick order !
Please send me - OFF LINE - your recommendation for a handheld impedance
measuring tool that covers 400KHz to at least
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