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Yaesu FRG-9600

Yaesu FRG-9600

The Yaesu FRG-9600 is an elderly receiver/scanner for the frequency range 60 - 900 MHz. Thanks to its spacious layout, it is quite easy to fit it with a discriminator output.

The receiver IC is an MC3357. This IC can be found on a vertically mounted circuit board. Pin 9 contains the unfiltered audio.

Yaesu FRG9600
Pin 10
discriminator output
Pin 9 of the MC3357 contains the baseband audio
The 10 k soldered to pin 9

A 10 k resistor is soldered to pin 9 of the receiver IC. A pice of insulated wire is connected to the resistor's other lead.

A 3.5 mm chassis socket can be mounted in the metal backplane of the receiver. A separate ground connection is not necessary. Connect the wire from the 10 k resistor to the appropriate solder lug of the socket.

The output voltage of the MC3357 appeared to be quite high (about 2 V peak-peak). By soldering a 10 k resistor over the contacts of the chassis socket, a 1:2 voltage divider is created to attenuate the output signal and protect the line- or microphone input of a connected PC.

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