Epson manual MFJ-1278B MULTI-MODE Radio Interfacing, MFJ-1278B Radio Ports

MFJ-1278B MULTI-MODE RADIO INTERFACING

RADIO INTERFACING

Computer interfacing, covered in the previous chapter, is only half the interfacing task. The other half is connecting your MFJ-1278B to your radios.

MFJ-1278B Radio Ports

Interfacing the MFJ-1278B to your radios involves connecting the following signals at Radio Port 1 and Radio Port 2. The pin outs of Radio Port 1 and Radio Port 2 are shown in Fig. 3-1.

Pin1 Microphone audio, from the MFJ-1278B to your transmitter.

Pin 2 Ground, audio and PTT common.

Pin3 Push-to-talk, to allow the MFJ-1278B to key your transmitter.

Pin 4 Receive audio, from your receiver to the MFJ-1278B.

Pin 5 Squelch input (optional) to allow the MFJ-1278B to detect activity on a shared-mode channel.

Fig.3-1 Radio Port 1 and Radio Port 2 Connector

This chapter describes how to connect the MFJ-1278B to your radio and how to adjust the receive and transmit audio levels appropriately. The interconnection needs to be well thought out, to minimize pickup of stray audio and RF noise by the lines. If possible, you should set up your station with a monitor speaker and be able to operate on voice without disconnecting the MFJ-1278B.