The upper frequencies in the 10-meter, 6-meter, and 27 MHz bands could be positioned at the identical spot over the C3 calibration by altering the screw slugs within the associated coils, using the signal generator fixed at the matching frequency and having C3 fixed at the required point clo...
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Depending on the 2 meter and 70cm frequencies you choose for tuning your antenna, you might have to compromise a little. I got lucky, because I was using 147.060 MHz and 442.100 MHz, which just happened to both yield a length of 19.08 inches for the longer of the two 3/8″ rod elemen...
L1 antenna coil is made using 73 turns of 0.3 mm super enameled copper wire over any standard ferrite rod. The transistor base side of L1 consists of 10 turns over the 73 turns, using the same wire. L2 is made by winding a 25 feet of No. 7/41 litz wire over a 3/4 -inch long...
The signal received by the second antenna is subsequently provided to a resonance circuit created by L1, L2 and the varicap C2. This allows the meter to be precisely tuned to the specific transmitting frequency which needs to be measured. With the inductance values shown for the coil in the...
the jammer's working range, nonetheless for just in the area the antenna is directed. High-gain, omni-directional antennas may be considered very successful for most RF jamming implementations. For homebrew prototypes, you could think scaling down (or up) 900 MHz band amateur radio band ...
The antenna does not need to be anything special, rather an ordinary 2 feet long flexible wire will be quite enough to enable the transmission to reach over 200 meter distance. Along with these two transmitters you will also need a couple of FM receiver units or simply FM radios, so that...
Passivetesting of an electronic circuitappears pretty straightforward job. All you want is really a Ohm meter. Sadly, still, working with this type of device forsemiconductorsis not really advisable. The output currents will probably harm semiconductor junctions. ...
Using 4 different coils for L1, the circuit will quickly detect and start receiving the 2, 6, and 10-meter ham band signals and possibly even the 27 MHz spot. The coil details are indicated below: For receiving 10-meter band, or 27-MHZ band, use L1 = 3.3 uH to 6.5 uH inductance,...