On 2/2/21 1:46 PM, David Eckhardt wrote:
What the dickens are "Squarers"? I'll confess the ISM bands are a good
place to hide possibly illegal and unlicensed emissions. However, as a
licensed ham for some 61 years and worked professionally in the EMC
regulatory world for some 35 years, I can not condone the practice.
It is legal to run an unlicensed transmitter on 13.56, as long as the power is low enough (i.e. meets Part 15). A few mW is typical, and as sunspots heat up, you could "work the world" with suitable modulation.
And to keep it notionally nanoVNA centric, at that power level, every little bit helps when it comes to designing and match, although the goal isn't low DC power, it's to keep the radiated power below the FCC limit (some 10-20 mV/meter, as I recall).
A NanoVNA might make a handy way to actually measure that radiated field. (or, at least, the antenna efficiency) by using a calibrated antenna on the other port and measuring S21.
