Radio Probe ..... multifunctional instrument: three buttons to select the various functions, furthermore the contacts above the instrument are used for the capacitance meter / inductance meter as well as for additional functions: varicap measurement and output with the Philips I2C protocol for further expansions. Low frequency amplifier inserted for signal trace function: the small speaker is recovered from an old mobile phone. Below is the layout of components and practical implementation: as you can see, traditional and therefore easily available components are used, however to reduce the dimensions the resistors and inductances are mounted vertically. The container is made from cuttings of a copper base which also functions as a screen. The software is written entirely in assembler and has approximately 4500 lines of code. The power supply is 12 Volt DC. The photos on the right illustrate the various screens based on the function selected.

Designed and created : Giacomo Bovio & Rinieri Paolo .

Awarded at the Florence Hamfest self-build competition with 1st prize ........................................................................ Photo on the righ

List of functions and technical characteristics (see also photo at the top right):.............................................................

Radio Probe v 2.2: presentation and software version

Vcc: measures voltages 25 Volt f.s. Lv.

Logical: displays 'L' for voltage < 0.8 Volt or ' = ' for intermediate or pulsating values or 'H' for voltage > 3.9 Volt

LCMeter : capacimeter 0 - 100 nF & inductance meter 0 - 10 mH with automatic calibration

FH: frequency measurement up to 40 MHz: possibility of adding or subtracting IF which can be set to standard preset values

FU: frequency measurement from 40 MHz to 1 GHz: possibility of adding or subtracting IF settable on pre-set standard values

1 Gen: square wave generator from 0 to 3270 Hz with an increase of 10 Hz

2 Gen: as above but with 0.5 Volt AC output: also inserts a low frequency amplifier and therefore uses it as signal trace

Marker: signal output at 10 - 50 - 100 KHz with 10 - 50% duty cycle