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
Just worked them on TB
They're Tx 1818.5
Heard me on 181685
23:38Z
Good luck!
73,
Gary
KA1J
_
Topband Reflector Archives - http://www.contesting.com/_topband
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 couldn't find a price for the AA-170. Can you share it, as well as the
place of purchase?
Thanks,
Mike
www.w0btu.com
On Mon, Mar 28, 2016 at 4:55 PM, Dick Bingham
wrote:
> Many thanks to those who sent recommendations for portable antenna
> impedance measurement
Many thanks to those who sent recommendations for portable antenna
impedance measurement tools. I will purchase the AA-170 and smile all the
way to the bank. . .
73 Dick/w7wkr CN97uj
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Topband Reflector Archives - http://www.contesting.com/_topband
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
Is the lowest SWR is the resonant frequency?
Resonant frequency is when Xl=Xc.
When Xl=Xc is not necessarily the lowest SWR.
73 Lou KE1F
On 3/27/2016 8:30 PM, Robert Harmon wrote:
Maybe a dumb question but how can you tell the resonant freq with
the AA-54. I have one and can do the graph
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
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