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                        Kenwood Service Centers

   Kenwood Service Corporation             Kenwood Service Center, East
   2201 East Dominguez Street              829 Lynnhaven Parkway, Suite 130
   Long Beach, California 90801            Virginia Beach, Virginia 23452
   Telephone 1-310-639-5300                Telephone 1-804-340-1702

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BULLETIN # 63
MODEL: TS-520
SUBJECT: ADDING IF OUT FOR USE WITH THE SM-220 SCOPE

              
 The TS-520 and TS-520S transceivers do not provide an IF output signal.
 It is necessary to have this if you want to look at a specific received
 signal on the SM-220 station monitor. The best place to pick up this
 signal is at the tuned output of Q4 on the IF unit (X48-1060-00). A 22 pf
 capacitor should be used for coupling and a 10 Kohm resistor for impedance
 matching. This is shown in the schematic below. The center conductor of
 a 36 cm (14") length of 50 ohm (RG-174/U or similar) cable is connected to
 the pick-up at one end and to pin 7 of the REMOTE socket on the other end.
 The shield is connected to pin 1 of the REMOTE socket and the ground path
 of the IF Unit. A 76 cm (30") 50 ohm cable should be made up with one end
 connected to pins 7 and 1 of the 8 pin plug supplied with the transceiver
 and BNC connector on the other end. The BNC connector will be plugged into
 the vertical input jack on the front of the SM-220