Leaving the "sleeve" or ground tab isolated and using just the ring and tip is a matter of personal preference. They are kinda beefy and will take some abuse. The best choice for the footswitch connections is to use TRS connectors. I can't say what if any issues may arise from placing the diode inside the footswitch and then using it on other radios.
#Yaesu mh 36e8j cable install#
IF you are only using your footswitch for MH48 Yaesu radios, you can install it inside the footswitch. The diode is installed in the XLR female body. Yaesu used a surface mount switching diode in the MH48 so I included a through hole version ie 1N4148. Notice the use of a 1N4148 diode in the PTT path. IF you choose to go the transformer route.The "hot" or center conductor and the shield from the cutoff end of the Hosa cable would be directed connected to the audio and ground wires from the MH48 cable. I can't say that the wire colors will always be the same from cable to cable so I will use the RJ12 pin number instead. The single header isn't used for this effort so it gets cut off! Only three wires are needed. The other is a single header connector for use inside the mic. It is the same cable that is used in the MH48 mic. The ace I have is a replacement MH48 mic CABLE. Because I had an ace up my sleeve, I really didn't give it much more thought. I compared the MH48 connector to a new RJ12 I had and couldn't see any real difference. The mic jack on the radios I tested (FT2900, FTM400 and FT1807) would not allow a standard 6 pin RJ12 (6P6C) connector to lock in place. Tired of reading yet? Well here's one more twist. In this application the phone plug would be cut off and discarded. My guess is that the phone plug end of the cable has both the ring and tip connections shorted together. I serioulsy doubt that there are individuall left and right output taps on the transformer. One end of the cable is a female XLR and the other is a 3.5mm or 1/8" "stereo" male phone plug. It's intended to be used for connecting a single balanced mic to a unbalanced camcorder or DSLR camera. The MIT-156 is a cable with a built in matching transformer. Hosa is a company that makes cables and adapters for the audio industry. The better (and more expensive way) to make the connection is to use a transformer to both isolate and balance the impedances. As a common practice its better to have a low output impedance feed a higher input. The brute force method is used here because although there is a difference in impedance, its not a game ender. Ground (pin1), red or white (pin 2) und black or dark color (pin 3). As a quick side note, if you ever need to wire an XLR connector just remember GRUB. The brute force way is to connect the "cold" or pin 3 (the one at the top of the circle) to pin 1 which is ground. There simply isn't a need for a balanced connection.Ĭonnecting a balanced "600 ohm" microphone to the unbalanced input of the FTM400 isn't hard to do. Most if not all mobile radios have unbalaced mic connections. The output impdeance of a balanced mic may be as low as 150 ohms or as high as 600 ohms. Any balanced microphone will have a male XLR as its output connector. The XLR or "Canon" is an audio industry standard connector for balanced audio.
#Yaesu mh 36e8j cable manual#
According to the owners manual specifications, the transmitter audio input impedance is "about 2.5K". The radio that this project is centered on is the FTM400DR. My understanding is that the output impedance is a couple of k ohms. It uses a condeser element similar to most communications mics. The MH48 mic is the default mic for most if not all of Yaesu's mobile radios in 2015. It's hard to imagine that the commercial world missed this one. He told me that he would have bought a cable retail, had it been available. The cable would allow the use of a foot switch to key the transmitter. Another amateur had asked me about making an adapter cable for his XLR based microphone for use with a Yaesu FTM400DR that he was using in his home. The other side of this effort is an attempt to get a little control over the sound quality of the transmitted audio. If you are one of the amateurs that have purchased a Yaesu moble radio for use in your home, I'm sure you are getting tired of holding that MH48 DTMF microphone.
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