These two features are connected to a 2.5 mm plug. The challenge is two functions (2) and (3). The speaker has two independent wires connected to a 3.5 mm plug, so the speaker function is excluded here. The two types of speaker-microphones, such as the IC-HM9 and HM-131L listed above, have the following three functions. Now I would like to explain the mechanism. 1 IC-HM9 and HM-131L The mystery of working a microphone and PTT with two wires However, that any speaker-microphone can be used with either monaural or stereo type plugs.įigure. It seems that the speaker-microphone plug has changed from a monaural to a stereo type during the company's product development. Looking at the IC-HM9 plug, both the speaker plug and the microphone plug are the same monaural plug. The IC-HM9 was an option for that transceiver, but its microphone plug, unlike the recent speaker-microphones, had a monaural type plug. 1) There was an IC-2A series handheld transceiver that was popular around 1980. These days, Icom's speaker-microphones for handheld transceivers have a monaural type plug for the speaker and a stereo type plug for the microphone.
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