Auhf Phone Sniffer Circuit Receiver

Figure 2. The modified circuit. Hie basic changes an in the diode strings, 20 73 Amateur Radio * March, 1988

2tKh the high voltage line increased about 300 volts, and power output increased by about 50 Watts,

The Nitty Gritty

Users may exercise their own options to mount the pans required lo complete the modification, One method is to \older the capacitors across the body of the diodes and to place the resistors to the foil side of the PC board. The 20Q resistor can be mounted on this side as well. Some people may choose lo mount the resistor on terminal strips located beside the PC board. Others may cut the PC board trace in appropriate locations and directly solder the resistor on the bottom of the board. This will depend on the size of the resistor-

This modification should be done on the SB-220 linear as well. Another diode in the series-string will keep a safety margin. If the manufacturer rates the diodes at 1000 PIV, for instance, a 750 PIV design rating builds in a 25% safety factor.

This modification doesn't take a great deal of time and can be classed as an easy weekender project for a stormy winter!

Figure 2. The modified circuit. Hie basic changes an in the diode strings, 20 73 Amateur Radio * March, 1988

Keith VESXZ has been a firefighter for seven years for the city of Prince Albert, Canada, as well as an emergency rescue instructor for St John s Ambulance, lie's been a ham for 17 years.

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