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automatic (direct reading) SWR Meter
On Thu, 09 Nov 2006 15:00:25 -0800, Roy Lewallen
wrote: MAc wrote: I was thinkink about it, but i want to do it "as much analogue as possible" ;-) You'll get some good ideas from "The Tandem Match - An Accurate Directional Wattmeter" by John Grebenkemper, KA3BLO, in Jan. 1987 QST. See also corrections to the article in Jan. 1988 Technical Correspondence. Also he http://n2pk.com/RLPmtr/RLPv1c.pdf |
automatic (direct reading) SWR Meter
xpyttl napisał(a):
If you're going to be doing the math anyway, analog or digital, and providing some sort of calibration mechanism, you don't need to get too weird about the directional coupler. DC (coupler) isn't a problem for me. I've made few reflectometers (both HF and VHF) based on homebrew couplers. I've tested toroids, pcb's and copper tubes. I am rather afraid (terribly afraid) about mistakes in my op-amp mathematics ;-) Now I'm thinking about ad 8302, 8307 and also (used in my FSM - ad8313) MAc sp9mrn |
automatic (direct reading) SWR Meter
Wes Stewart napisaĆ(a):
http://n2pk.com/RLPmtr/RLPv1c.pdf N2PK wrote ~~"...measure return loss instead of swr..." I think, its the best way. I suppose (only for "comparisom" purposes) I can make a second scale on meter face which will show swr (N2pk article figure2) MAc |
automatic (direct reading) SWR Meter
"MAc" wrote in message
... I am rather afraid (terribly afraid) about mistakes in my op-amp mathematics ;-) Don't be afraid ... just fudge it! ... |
automatic (direct reading) SWR Meter
So, the way is 2x AD8310 +dual opamp and analog meter.
Will report the result. Now I'm waiting for parts. Thanks to all 73 MAc sp9mrn |
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