A Yagi is not a traveling wave antenna. Most familiar to the amateur
community would be the beverage which is a traveling wave antenna. Above
ground power grid conductors are also traveling wave antennas and,
therefore, gather lots of energy from any HAB (High Altitude [nuclear]
Burst).
Dave - W?LEV
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On Mon, Sep 30, 2024 at 7:05?PM KENT BRITAIN via groups.io <WA5VJB=
FLASH.NET@groups.io> wrote:
Well, you do need just the right phase delay between elements to
get the clean forward lobe.
On Monday, September 30, 2024 at 01:08:12 PM CDT, AG6CX <
edwmccann@...> wrote:
True that the Yagi is resonant, but it radiates as traveling wave, doesn’
it?
Like the V, the rhombic, etc.
5wFenuUq5MiLpT756 ( )
PDF Document · 787 KB ( )
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Ed McCann
AG6CX
On Sep 30, 2024, at 10:47?AM, KENT BRITAIN via groups.io
<WA5VJB@...> wrote:
? Yagi's are very resonate.
Now a beverage has more in common with a directional coupler than an
antenna.
On Monday, September 30, 2024 at 12:41:19 PM CDT, AG6CX
<edwmccann@...> wrote:
Guess you better tell anyone using a Yagi-Uda, or Beverage Antenna that
they haven’t really been radiating all these years.
Ed McCann
AG6CX
On Sep 30, 2024, at 10:19?AM, KENT BRITAIN via groups.io
<WA5VJB@...> wrote:
? For an antenna, if it doesn't resonate, it really doesn't radiate!
Ok, Ok, there is some minor leakage from a dummy load.
On Monday, September 30, 2024 at 12:10:26 PM CDT, Salvatore Terress
<salvatoreterress@...> wrote:
Would it be correct to state that for transmit purpose - the SWR is the
defining component, not the resonance of the antenna proper ?
On Wed, Sep 4, 2024 at 1:03?PM W0LEV via groups.io <davearea51a=
gmail.com@groups.io> wrote:
You are so correct. In my many models and in using SimSmith, the
"last"
was left with an optional Zo of 1050 ohms, NOT 50 OHMS! The 1050 ohms
was
input into the model to simulate the effect of an ideal 21:1 BB
transformer. I didn't notice or remember that when I hit "copy".
Thank you for calling out my error!
Dave - W?LEV
On Wed, Sep 4, 2024 at 5:58?PM Fran?ois via groups.io <18471=
free.fr@groups.io> wrote:
The qualitative conclusion here is that a "wild"
impedance value of 890 - j418 which is far from resonance can and
does
yield an acceptable
SWR.
I guess there might be a mistake
If Z=890 + j418 Ω then, relative to 50 Ω
ROS=21.7
|S11| = 0.91
S11 = 0.91 -j 0.04
In fact the point you have drawn does indeed produce a ROS < 2 but the
impedance it represents is not
890 + j418 Ω or the normalization impedance, which you do not
specify, is
not 50 Ω
--
F1AMM
Fran?ois
De la part de W0LEV
Envoyé : mercredi 4 septembre 2024 18:55
--
*Dave - W?LEV*
--
Dave - W?LEV
--
*Dave - W?LEV*
--
Dave - W?LEV
