Roger:

Isn't that a "resistive bridge" and consumes ~3/4 of the power? Or, am I
looking at the right design?

It just occured to me, because of your post, I didn't say "can be left
inline" for my design criteria--sorry, my mistake....

But, yes, that would be good enough, thanks for pointing that circuit out to
me.... my only problem, is other than a walkie-talkie, I have no rf souce
of that low of power (~4 watts or less)....

Warmest regards,
John

"Roger Conroy" wrote in message
...
|
| "Cecil Moore" wrote in message
| ...
| John Smith wrote:
| http://blake.prohosting.com/mailguy2/swr1.jpg
| http://blake.prohosting.com/mailguy2/swr2.jpg
|
| This should prove as "proof of concept" that an "indicator" using such
a
| toroid should darn well work! ... at the very least--in the fashion I
| am
| attempting...
|
| If you will notice, your earlier versions did not sample
| the voltage. These designs sample the voltage through C1
| and C2. The current is sampled by T1. The voltages are
| phasor-added to the current to obtain signals proportional
| to forward power and reflected power. Those voltage sampling
| caps are what were missing from your earlier designs.
| --
| 73, Cecil, http://www.qsl.net/w5dxp
|
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| CQ Amateur Radio magazine October 1997 "N7VE's One LED SWR Indicator".
|
| 73 Roger ZR3RC
|
|