Thursday, September 14, 2017

Mizuho MS-1 microphone wiring for MX-serie radios


Hi all,

as some of friends asked me which kind of microphone will work with MX series of Mizuho transceivers and which kind of microphones used Mizuhos originally there I am sharing what I know about it.

For external Mic. need to be inserted the 3.5mm diameter jack plug. See the picture which is available in original manual including the points (6) and (7) regarding the external microphone and external speaker usage.




The microphone connection wiring is diferent from the MX-3.5S and MS-1 external speaker/microphone should be used.



There is the schematic diagram of the MS-1 speaker/ext. microphone made by Mizuho.


The MS-1 won't work with the older radios like MX-2, MX-6, MX-10Z, and MX-15 handheld SSB/CW transceivers because the microphone plug wiring is different than on the later Pico MX-series handhelds.
The another external speaker/microphone M-4 model by Mizuho should be used.

The 40mm diameter, 8Ohms, 0,35W speaker is used in MS-1 and the 600Ohms Mic line. The microphone plug and external speaker plug are integrated into molded common connector which is the difference from the M-4 btw. The PTT switch only connects and disconnects one wire.




Hope it helps,

73 - Petr, OK1RP