Carlos,
In addition to Erik's directions, please be sure to use a 50DB attenuator on the input to the TinySA.? I built a 50DB tap and connected it to a 100watt dummy load.? I then use a step attenuator between the tap and the TinySA.
Rig --------TAP--------Dummy Load
? ? ? ? ? ? ? ? ? |
? ? ? ? ? ? ? Step Attenuator
? ? ? ? ? ? ? ? ? |
? ? ? ? ? ? ? TinySA
Here is a link to a paper on how to build a 50DB tap:
It includes a parts list.
I purchased the step attenuator from Amazon:
You will also need the adaptors to match the coax connectors.
I found the above to be easier to use than going through the TinySA menu system and adds a level of protection before you turn it on if you set the step attenuator for the maximum attenuation before turning on anything.? Overkill, but I am paranoid.
If you need to measure harmonics that fall above 100MHz, you may need to characterize the tap.? That does require a second instrument (which I highly recommend), a NanoVNA.? I adjusted the capacitor across the 50ohm resistor to keep it flat to 150MHz.? Beyond that value, I have not tried to measure a signal, so I cannot say how well the setup works above 150MHz.? That upper limit is for the Harmonic you want to measure, not the fundamental.
You can always buy a 100watt, 50DB attenuator, though they are costly unless you want to trust AliExpress.
73
Evan
AC9TU
