>>> 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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OSCILLATOR, P/N VCO2C

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DIPOLE ANTENNA, P/N DA 188

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LINE OUTPUT CABLE

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POWER SUPPLY

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