1. Build the circuit!
2. Adjust the circuit so that it is transmitting around the
following frequency: Section A : 90MHz, Section B : 95 MHz, and
Section C : 98 MHz.
4. Explain your steps and note down all your observations.
5. Assume a single tone input at the microphone. (or an audio file
from your phone)
6. Show the signal or its spectrum at different points in the
circuit. You may do that by measurements (Oscilloscope with enough
Bandwidth).
1 Build The Circuit 2 Adjust The Circuit So That It Is Transmitting Around The Following Frequency Section A 90mhz 1 (37.02 KiB) Viewed 37 times
ELECTRET MIC R1 10K ww R2 10K C2 0.01 uF VC 4-40 pF C1 не 10 uF R3 4.7K NOTE 1: L1: length = 0.25 inch NOTE 2: Q1 2N2222 R4 47 () E w diameter = 0.265 inch 5 to 6 turns yields apx. 0.17 uH VC set at 12.5 pF yields 108.8 MHz L1 5-6 TURNS AIR CORE C3 4.7 pF SPST C4 0.01 uF BATTERY 4-6 V ANTENNA 30 INCH WIRE
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