You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
The Feb 2025 Radioddity Giveaway Results are In! Click Here to see who won!

Reply to thread

Message

Think of it in terms of a Smith Chart when you think of SWR and feedline impedance transformation. You have the middle point, which is a perfect match and a 1:1 SWR. Elsewhere on the chart, you have all other combinations of impedance and reactance.

Using the match point and any other point on the smith chart you can use a compass and make a circle, that circle shows us two things. One, all of the points (or combinations of reactance and impedance) on the smith chart that have the same SWR, and two, the results of the transformer action of a (admittedly theoretically perfect lossless) feedline as you travel away from the load. These circles are exactly the same.

If you factor in feedline losses as you travel down the feedline that circle becomes a spiral, spiraling towards the perfect match point.

The DB

<blockquote data-quote="The DB" data-source="post: 434331" data-attributes="member: 21346">Think of it in terms of a Smith Chart when you think of SWR and feedline impedance transformation.&nbsp; You have the middle point, which is a perfect match and a 1:1 SWR.&nbsp; Elsewhere on the chart, you have all other combinations of impedance and reactance.Using the match point and any other point on the smith chart you can use a compass and make a circle, that circle shows us two things.&nbsp; One, all of the points (or combinations of reactance and impedance) on the smith chart that have the same SWR, and two, the results of the transformer action of a (admittedly theoretically perfect lossless) feedline as you travel away from the load.&nbsp; These circles are exactly the same.If you factor in feedline losses as you travel down the feedline that circle becomes a spiral, spiraling towards the perfect match point.<a href="http://hittman.us" target="_blank">The DB</a></blockquote>

[QUOTE="The DB, post: 434331, member: 21346"] Think of it in terms of a Smith Chart when you think of SWR and feedline impedance transformation. You have the middle point, which is a perfect match and a 1:1 SWR. Elsewhere on the chart, you have all other combinations of impedance and reactance. Using the match point and any other point on the smith chart you can use a compass and make a circle, that circle shows us two things. One, all of the points (or combinations of reactance and impedance) on the smith chart that have the same SWR, and two, the results of the transformer action of a (admittedly theoretically perfect lossless) feedline as you travel away from the load. These circles are exactly the same. If you factor in feedline losses as you travel down the feedline that circle becomes a spiral, spiraling towards the perfect match point. [URL="http://hittman.us"][COLOR="Black"]The DB[/COLOR][/URL] [/QUOTE]

Top Bottom