Epson MFJ-1278B manual External Interface Box

MFJ-1278B MULTI-MODE RADIO INTERFACING

Fig. 3-7 External Interface Box

If you built the external interface box as in Fig.3-7, then follow this procedure to adjust R(s).

1.Install JMP J on the MFJ-1278B PC board.

2.Temporarily solder a variable resistor in place of R(s) Fig. 3-7. The maximum value of this resistor can be determined by experiment. However, a 500K resistor should be adequate most cases. Connect your MFJ-1278B to the radio. Connect the microphone to the radio, or to the interface box if one is being used. Connect the radio to a dummy load and listen to the transmission with another nearby radio. Adjust R(s) for proper modulation as the next sections describe.