Re: W7ZOI power meter (AD8307 based)
Not strictly log VSWR, but a linear scale of decibels of return loss, which is actually better.
I made one with the AD640 predecessor chip in 1993. G3ROO made the boards. We didn't publish because it seemed a bit too much for most UK magazines of the time.
Oh, and I fed the limiter outputs to an CL phase detector, so I get return loss and phase.
A VECTOR, logarithmic power meter!
It's built into my 'biggest mistake' ATU.
DAvid
__________________
Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
|