In article , "Dave"
wrote:

Is this Smith Chart stuff? (You must forgive me, I am a primitive.)

A Smith chart is a way of graphically relating impedances to reflection
coefficients. The code that made the plots on the web page did the same
sort of calculations numerically. The plots themselves are semilog
Cartesian coordinates, not Smith charts.


On Sun, 13 Jul 2003 12:21:23 +0400, "John Doty" wrote:

In article , "Dave"
wrote:

We are not concerned with the characteristic impedance of the wire
antenna. We are concerned with its RF impedance as an antenna, not a
piece of metal.

The characteristic impedance is where the center of the antenna's
impedance spiral is. That's a good choice for a matching impedance if
what you want is a broadband antenna.

See: http://www.anarc.org/naswa/badx/ante..._longwire.html



--
| John Doty "You can't confuse me, that's my job."
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Amazing.

I'm going to save this, in case it comes up at a party.

Thanks.

On Sun, 13 Jul 2003 19:58:11 +0400, "John Doty" wrote:

In article , "Dave"
wrote:

Is this Smith Chart stuff? (You must forgive me, I am a primitive.)

A Smith chart is a way of graphically relating impedances to reflection
coefficients. The code that made the plots on the web page did the same
sort of calculations numerically. The plots themselves are semilog
Cartesian coordinates, not Smith charts.


On Sun, 13 Jul 2003 12:21:23 +0400, "John Doty" wrote:

In article , "Dave"
wrote:

We are not concerned with the characteristic impedance of the wire
antenna. We are concerned with its RF impedance as an antenna, not a
piece of metal.

The characteristic impedance is where the center of the antenna's
impedance spiral is. That's a good choice for a matching impedance if
what you want is a broadband antenna.

See: http://www.anarc.org/naswa/badx/ante..._longwire.html

John,

Nice to see you back on the group. Things have been a little rough here
lately but there's still hope. I often recommend your low noise antenna
with the balun located near the ground. It worked well for me. I can
listen to shortwave now without any interference from the computer,
television and other home appliances.

How are things in the X-ray universe?

John Doty wrote:

In article , "Dave"
wrote:

Is this Smith Chart stuff? (You must forgive me, I am a primitive.)

A Smith chart is a way of graphically relating impedances to reflection
coefficients. The code that made the plots on the web page did the same
sort of calculations numerically. The plots themselves are semilog
Cartesian coordinates, not Smith charts.


On Sun, 13 Jul 2003 12:21:23 +0400, "John Doty" wrote:

In article , "Dave"
wrote:

We are not concerned with the characteristic impedance of the wire
antenna. We are concerned with its RF impedance as an antenna, not a
piece of metal.

The characteristic impedance is where the center of the antenna's
impedance spiral is. That's a good choice for a matching impedance if
what you want is a broadband antenna.

See: http://www.anarc.org/naswa/badx/ante..._longwire.html


--
| John Doty "You can't confuse me, that's my job."
| Home:
| Work:


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