Low power RF measurement is of vital interest
when you require a transmitter to be terminated into a 50 Ohms load
and simultaneously require a small rectified voltage for measurement
of RF Level.
This 10cm x 2.75cm double sided PTH board
contains 20 resistors in two banks each of 2K/0.25W to get 50 ohms at
around 10W of maximum power. It is expected to work upto about 500MHZ
with very low SWR.
At 50 ohms Terminated level, a diode rectifier
and an RF bypass capacitor develops DC voltage for further
measurement. A PM2 or more economical PM1
or even a simple Digital meter may be used for measurement of output
For those looking for Direct RF 50 Ohms
Terminated measurement, diode D1 my be omitted along with associated capacitor/Resistor
and either connect HOT RF to measurement connector (J2) or use a
blocking capacitor (in place of Diode) of suitable value and connect
an RF measurement unit such as PM1 or PM2 to J2.