"John Smith" wrote in message
...
Well, can't remember where I seen that "directional coupler", but will be
willing to give the designer credit if he makes himself know...

The led indicating circuit is my design...

It seems to work, all I have is another SWR with analog meter I
constructed
myself to compare it with, soon as I locate someone with a commercial
meter--I will compare both of mine to it... Only real apparent problem is
the REF led changes brightness slowly (and here it is hard to "judge" SWR
by
brilliance), until right at, or near, match, when it will plunge to
darkness
rather quickly...

Well, show me what is wrong and suggest an alternative circuit or mods to
set it proper (or explain in text, I will see how good I am at word
problems
here)--I am all EARS Cecil... smile

Regards,
John

"Cecil Moore" wrote in message
...
| John Smith wrote:
| OK, one... more.... time!!! there is no time yanno!
| Please someone, see if you can view the page he
| http://blake.prohosting.com/mailguy2/JS-swr.jpg
|
| You have a number of problems. Where did you get that design?
| In order to separate the forward power from the reflected
| power, you need to use phasor addition/subtraction of voltage
| and current. You only have current sampled. Where is your
| voltage sample? Where is your phasor addition/subtraction?
| --
| 73, Cecil http://www.qsl.net/w5dxp
|
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I found this while tidying my bookshelf last night:
CQ Amateur Radio magazine October 1997 "N7VE's One LED SWR Indicator".

73 Roger ZR3RC