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What is the input impedance of the Universal Wide Band amplifier? The only impedance information I can find mentions the "output" impedance, either 50 or 200 ohms, determined when winding the toroid during assembly.
nominally 50 ohms input Z
Here is an input scan of the Universal WideBand Amplifier. Not too shabby .
What is the max in/out?
The input is -16.5 dBm (94mV p-p)
The output is 0dBm plus 6db for the pad or + 6dBm (1.28V p-p into 50 ohms).
I did this today with the same amp on 18.076MHz
The top picture shows harmonic output with a pretty high input of -7dBm(280mV p-p)*
Looking at the ouput on a scope terminated in 50 ohms, the sine wave starts to look pretty bad when increased much above -7dbm.
All-in-all this is a time tested design and you should expect very good results when driving it with about 150mv p-p (give or take).
Add 6 db to the output power because of the pad I used with this amp.
The picture below it is at -17dBm (89mV p-p)*
*all measurements are into or out of 50 ohm impedances
So ... about 50uW of drive for less than 10mW out .... ok, my sdr puts out 50mWthe so this wont help ....
The RF Amp is designed to be a low level Amp (aka preamp).
It is NOT a RF driver amp.
That being said, it could easily be modified for higher power and/or class-c operation to the 1 watt output level.