1- KENWOOD  HF Transceivers with 13 pin DIN data I/O port; (TS-140, TS-450, TS-570, TS-680, TS-690S, TS-790 TS-850, TS-870, and TS-950..etc) with 13 pin DIN (ACC2) connector to PC Sound Card. This circuit is designed to prevent RF feedback by using transformer and opto-coupler isolation. (* A few Kenwood transceivers may require pin 13 of ACC2 for PTT, instead of pin 9, see next diagram 

 

 

 

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2- KENWOOD HF Transceivers (TS series = 120, 130, 180, 520, 530, 600, 700, 770, 820, 830, and others) with 4 pin microphone connectors, to PC Sound Card. This circuit is designed to prevent RF feedback by using transformer and opto-coupler isolation.kw4pm

 

 

 

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3- KENWOOD HF Transceivers (TR series = 7700, 7730, 7750, 8400, 7800, 7930, 7950, 9000, 9030, 9300, 9500 etc..., and others) with 6 pin ''Standard'' microphone connector, to PC Sound Card. This circuit is designed to prevent RF feedback by using transformer and opto-coupler isolation.

 

 

 

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4- KENWOOD HF Transceivers (TM-201, 221, 231, 241, 2530, 401, 421, 431, 441, 531, 541, 621, 631, 721, 731, TR-3200, 50, 751, 851, TS-140, 430, 440, 450, 670, 680, 690, 701, 711, 780, 790, 811, 850, 930, 940, 950, TW-4000, 4100, and others), with 8 pin Screw-On type microphone port to SB16 Sound Card. This interface uses transformer audio coupling and PhotoTransistor, Opto-Coupler (PTT) for RF isolation.

 

 

 

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5- KENWOOD HF, VHF, and UHF Transceivers that use pin 13 for PTT execution; TS-440*, TS-711*, TS-811*, and TS-940*. This is a 13 pin DIN female jack, labeled as ACCY2. This circuit diagram addresses only these specific Kenwood (vintage) transceivers. The associated kit performs the function of interfacing PSK31 signals to/from the transceiver while ISOlating the radio and PC sound card I/O. By using transformer and opto-coupler ISOlation, RF feedback and noise is reduced to a minimum.

 

 

 

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6- This interface for the KENWOOD HF Transceivers with 8 pin MIC connector is designed to execute a PTT software call using RTS. For ALINCO and KENWOOD 8 pin MIC to PC Sound Card for; PSK31, and other digital modes.

 

 

 

 

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7- Some KENWOOD TS-440 and similar Kenwood HF Transceivers with 8 pin screw-type MIC connector to PC Sound Cardconfigured for PSK31; and other digital modes.

 

 

 

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