Simple Field Strength Meter


Posted on Feb 6, 2014

The multimeter should be set to the lowest dc volts range for maximum sensitivity. This is normally 200mV DC for most meters. The circuit works well at VHF (around 100MHz) and was quite pleased with the results. L1 was 7 turns on a quarter inch former with ferrite slug. This covered the UK FM band. A digital multimeter, as opposed to an analogue s


Simple Field Strength Meter
Click here to download the full size of the above Circuit.

ignal meter offers several advantages in this circuit. First, the impedance of a digital meter is very high, around 10Meg/Volt on most meters. This does not shunt the tank circuit unduly. Second, compared to an analogue meter, very slight differences in signal strength can be more easily observed. Thirdly, a digital meter will have better linearity, responding well to both weak and stronger signals.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Off-line flyback regulator
Doorbell circuit using NE555 IC
Bubba oscillator with TLV2474
wireless temperature sensor
400w mosfet amplifier circuit schematic
transistor based burglar alarm
Telephone line monitors
AT89C2051 Real Time Controller



Top