>>> WIRELESS CONVERSION SYSTEM <<<
This System will turn your FM Radio into a wireless speaker. A wiring diagram of the frequency control / modulator and FM Band oscillator is shown in Figure 1. To turn the components of Figure 1 into a low power transmitter that generates a signal a FM Radio can receive, the VCO2C RF Output will need to be connected to the DA 188 dipole antenna.
The table of Figure 2 shows typical RF Output frequency as a function of DC control voltage at the VCO2C tuning terminal (V-T). Depending on VCO production lot variations, up to 0.20 volts may need to be added to or subtracted from the V-T values shown in Figure 2 to achieve the desired frequency. A 3 or 6 dB SMA attenuator may need to be inserted between the VCO2C and antenna to minimize frequency pulling of the VCO2C by the antenna mounting configuration.
Figure 1, Wiring Diagram
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| VCO Control Voltage (VDC) | RF Output (MHz) | RF Output Power (dBm) |
| 1.842 | 100.0 | 10.2 |
| 1.970 | 101.0 | 10.2 |
| 2.098 | 102.0 | 10.2 |
| 2.230 | 103.0 | 10.2 |
| 2.363 | 104.0 | 10.2 |
| 2.500 | 105.0 | 10.2 |
| 2.636 | 106.0 | 10.2 |
| 2.777 | 107.0 | 10.2 |
| 2.918 | 108.0 | 10.2 |
Figure 2, VCO2C Test Data
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Figure 3, VCO2C Test Data Plot
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VCO TUNING & FREQUENCY MODULATION PCA, P/N FM219
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