RFPM2 – current probe – #4 – TinySA Ultra

I have been asked about compatibility of the RFPM2 current probe with the TinySA and variants. The current probe was intended for use with a broadband 50Ω RF power meter, but could also be used with a Spectrum Analyser with 50Ω input or an oscilloscope with 50Ω input. RFPM2 – current probe described a current … Continue reading RFPM2 – current probe – #4 – TinySA Ultra

RF Power Meter 2 (RFPM2) – 40dB external attenuator calibration and integration

RF Power Meter 2 is a logging RF power meter based on AD8307 and ESP8266. This article describes its calibration and use with a 40dB 50Ω 20W attenuator to make a 20W or 43dBm RF power meter. Above is a pic of the system under test on a nominal 5W transmitter, indicating 37.4dBm, equivalent to … Continue reading RF Power Meter 2 (RFPM2) – 40dB external attenuator calibration and integration

RFPM2 – calibration files

The RF Power Meter 2 (RFPM2) stores calibration constants in a file located in the (SPIFFS) file system in the microcontroller flash. The file opened by default when RFPM2 starts is /default.cfg, the following is an example. { “name”:”dBm”, “hostname”:”rfpm201″, “vref”:3.3, “avg”:3, “slope”:0.12991, “intercept”:-91.406, “unit”:”dBm”, “lcdfsd”:16 } The parameters above capture the most basic operation … Continue reading RFPM2 – calibration files