Retro SWR Meter
Remember those old lovable and simple SWR meters from back in the Heathkit days? Simple tap off the coax, a couple of diodes as the forward and reverse RF probes, and a sensitive meter that can be switched to read in either direction? Well, what's old is new again as we explore the topic in this episode of CWTD, but using a couple of simplifying techniques to produce something as workable as before ... and equally fun in the building process!
Resistive – easy on rig
Analog meter – easy to read anywhere
No toroids to wind
Full-scale Set potentiometer
Analog Meter: 200 ua FS
Theory of Operation
Wiring the "Retro SWR Meter" ... Ugly-Style!
Theory of operation with simple math
Show fwd and reverse values for typical SWR values 3:1, 2:1 1.5:1
SWR to rig always 2:1 or lower
Need to think about packaging
PC Board necessary?
open – infinite swr
three in series 150 ohms 3:1 SWR
two in series 100 ohms 2:1 SWR
two in parallel plus one in series 75 ohms 1.5:1 SWR
The actual meter we'll be using in this project ...
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