WHAT TYPE OF INTERFACE IS NEEDED BETWEEN THE COMPUTER AND THE TRANSMITTER?
This varies with what program or device is being used. More details can be found in other sections covering the specific programs or devices. But here is a summary. MSDSP uses the Sound Blaster audio card to generate a tone. For the transmit-capable versions, a two-line stereo cable is plugged into the SB board’s Line Out. This is because one channel is used for the transmit tone, while the other channel is used to simultaneously carry the playback audio. From the line going to the right channel, a shielded cable is run to the mike (or AFSK In) jack. But there should be a small capacitor in series with this line at the mike jack. This is to block any DC voltage that may be present the at the mike jack, to drop the level slightly, and to pass only the higher audio tones. The exact value will probably be small, several hundred pF, up to .01 uF. Use the smallest that gives approximately the same amount of audio to the mike jack as you get from your mike. This, like many other things, will
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