MFJ-1270C/1274C MANUAL RADIO INTERFACING
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event) in your microphone audio circuit. If your transmitter has an adjustable
microphone gain control, try reducing the sensitivity of the transmitter
microphone circuit and increasing the signal level from the MFJ TNC to
minimize hum or other noise problems.
Setting the Receiver Audio Input Level
The modem in your MFJ TNC is equipped with an advanced phase coherence
type data carrier detector (DCD) with a sensitive tuning indicator. These can be
used in combination to set the correct receive audio level for the modem and to
optimize the DCD characteristics for the HF operation.
Method 2: Accessory Jack or Interface Box Connection
If your radio has an accessory jack with PTT, transmit audio, and receive audio
signals, the interface can be done through this jack (shown in Fig. 3-6).
Fig. 3-6 Accessory Jack Interface.
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