Re: Impedance Matching

From: John Popelish (jpopelish_at_rica.net)
Date: 06/11/04 

Date: Fri, 11 Jun 2004 18:03:01 -0400

Doug Goncz wrote:
>
> >That makes the 75 ohm look like 120, but doesn't make the 120 look
> >like 75. You can make that series resistor 73.5 ohms and parallel the
> >75 ohm side with 122.5 (or there abouts) and both sides will match.
> >--
> >John Popelish
>
> Thank you, Professor Popelish! I just learned something and it stuck!

You're welcome. The general formula is at the bottom of:
http://www.epanorama.net/documents/wiring/cable_impedance.html
Unfortunately, they don't give the general formula for the loss
introduced by the match, just some examples.

This one includes that (under the section on minimum loss pads).
http://unitmath.com/um/p/Examples/PulsedPower/Attenuators/Attenuators.html 

-- 
John Popelish