Thanks Regulus. Need to open my books for more info
but what you have given me is a head start!

John


--- Regulus Berdin <regulus.berdin@gmail.com> wrote:

> Richard Prosser wrote:
> > Try Googling "Homemade VSWR meter"
> > 
> > The first link that came up for me was
> > <http://ludens.cl/Electron/swr/swr.html> which
> seems to explain things
> > and gives a circuit etc.
> > 
> > If you want onle like the link you provided,
> you'll have to source a
> > suitable meter - or build one yourself using two
> separate meter
> > movements.
> > 
> > (Or build a PIC into it to handle the
> calculations!)
> > 
> > RP
> 
> About 10 years ago, the company I worked with
> manufactures CB radio 
> accessories. I have designed and built a digital
> autoranging SWR and 
> power meter for CB (27MHz) use.  It was on a
> Motorola 6805R3.
> 
> SWR is very easy to measure and calculate. Just use
> 2 AD inputs and read 
> the forward and reflected values on the 2 diode
> bridges. Then SWR is 
> computed using this formula:
> SWR = (F + R)/(F - R)
> Use the values directly for the readings are
> directly proportional to 
> the square root of the power.
> 
> For power, the values must be squared and scaled.
> 
> regards,
> Reggie
> -- 
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