Two schemes for connecting a transceiver to a computer sound card. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Two schemes for connecting a transceiver to a computer sound card. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Nodes of amateur radio equipment

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The communication device of a computer sound card with a Wilfried Stock transceiver (DO1SW) differs from many similar devices by the presence of AGC (Fig. 1). The 1:5 input transformer is isolation and protects the computer from static electricity and potential differences between the computer and the TRX.

Two schemes for connecting a transceiver to a computer sound card
Ris.1

Potentiometer P2 sets the required level of the low-frequency signal at the output. Transistor BC107 (KT315), depending on the position of the rotor P1 and the signal level, will shunt P2 within a small range, working in this case as an AGC to compensate for fluctuations in the input signal level.

Author: Wilfried Stock

Reinhard Kraus-Rechberg (DK5RK) also proposed a universal interface circuit for the microphone input of the transceiver. This interface is suitable for connecting to all sound cards and for working with all types of modulation, including SSTV (Fig. 2) and does not require a separate supply voltage. The low-frequency signal of the sound card is rectified by a voltage doubler on 2x1N4148 and opens the BSN10A field-effect transistor, which is suitable only for a self-closing type that maintains a high-resistance drain-source state without gate voltage.

Two schemes for connecting a transceiver to a computer sound card
Ris.2

When low-frequency voltage appears, it will switch, while most transceivers switch to transmission mode already at a resistance of 1 kOhm, i.e. at a PTT current of 1 mA. The used transistor has a direct channel resistance of 110 ohms

Author: Reinhard Kraus-Rechberg (DK5RK); Publication: N. Bolshakov, rf.atnn.ru

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