Yes, I suspect that mine is relying on "stray capacatance" and it is not
sufficient--and--that is why I experience that "plunge into darkness" of the
REF LED at 1:1--and NOT a smooth adjustment and indication... (just
guessing)

Anyway, those capacitors are VERY small ~3pf, and as Cecil was so kind to
point out to me, in an email, a twisted pair of high-pot enameled wires
would, most likely, suffice--keeping with my "cheap and simple" design....
I can simply chuck another of my junkbox toroids in for the rf choke...

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
|
|