Help with Yaesu MD-31 Microphone

[cbkidd1]

Evening,
Would anyone happen to know the wiring code for a Yaesu MH-31 microphone To a Yaesu ft-1000MP MKv? I misplaced the paper that I Had written down what color wire went to each of the 8 pins on the connector. I have not been able to find the info on the net. I really appreciate the help. 73,

 

[oldtymer]

Evening,
Would anyone happen to know the wiring code for a Yaesu MH-31 microphone To a Yaesu ft-1000MP MKv? I misplaced the paper that I Had written down what color wire went to each of the 8 pins on the connector. I have not been able to find the info on the net. I really appreciate the help. 73,

Go to Heilsound.com website & click on Amateur sub heading.
There is a folder I think is labeled data & in there are wiring for mics broken down by
manufacturer Kenwood, Yaesu, Icom each have their own section.

 

[cbkidd1]

Evening oldtymer,
I hope your enjoying your weekend Sir, I greatly appreciate your time and help. I will check bobs site and let you know how it works out. I tell you trying to find out the wiring code for the microphone to the radio going by the wire color and matching the pin out has turned out to be very difficult. Not so hard to find out each function to each pin. The trick is finding which color wire goes on each pin lol. That info is scarce, 73,

 

[cbkidd1]

It was under pinouts.

PIN 1 UP
PIN 2 + 5 VOLTS
PIN 3 DOWN
PIN 4 FAST
PIN 5 GROUND
PIN 6 PTT
PIN 7 MIC GROUND
PIN 8 MIC
The trouble with that is I need to know going by color of each wire as to which pin they go to? I also have learned that I need a wider 11 x 7mm Murata /TOKO 455Khz AM IF filter part number #CFWS455F or #CWFS455G In order to widen AM transmitted bandwidth. It appears they no longer make them. Would anyone know of a replacement I could use????????? 73,

 

[DainBramage]

https://www.ebay.com/c/1131922170?iid=370774978737


and


https://kb1jpw.com/tag/yaesu-mh-31

 

[cbkidd1]

Appreciate your time and help Dain, But not the right ceramic band-pass filter need 5 legs. Wiring diagram for mic is not wired for ft-1000mp mkv. Here is a copy for the AM Band-pass filter mod. I am having no luck trying to find the right 455 Khz AM IF filter or wiring diagram for the MH-31

Increasing the overall transmitted bandwidth for AM will call for another filter change. Looking at Picture 30 of the IF Unit, you will find CF2002 circled in red. This is an 11 x 7mm Murata 455Khz filter, part number CFWS455HT. This filter alone is the limiting factor to our transmitted AM bandwidth. By replacing this filter with a different Murata filter, such as the CFWS455F, we can increase our overall transmitted sibilance to roughly 6Khz; 12Khz total transmitted bandwidth. However, just like the ESSB modifications, we are now transmitting twice the bandwidth we did before. Again, this transmitted bandwidth can be controlled through the usage of external audio equalization equipment. And unlike the ESSB modifications, we do not need to adjust the carrier offset to account for the new bandwidth. So the AM carrier offset, t-A3-cAr, found in menu 9-0 needs to stay at factory default for your radio. Now it should be said that I have not done this particular modification, but it is well documented and in usage today by K1DEU. You will find a hyper-link to his website in Appendix A of this document. Now, how will this affect the current ESSB modifications that we just performed? It will definitely add a little to our receive bandwidth as we are now passing the IF through a 12Khz filter, particularly if menu 5- 0 is set for 455. But with the good, definitely comes a little headache. When this new Murata filter is selected for SSB receive, it is no longer straddling zero beat, yet passing 12Khz of receive IF for either USB or LSB. Because of this we can expect strong stations within that 12Khz band-pass to affect our AGC. So there is definitely a decision to be made here, one that I have not settled on yet either. However, I am considering using a different Murata Filter, a CWFS455G. This is the same filter used for FM operations within the Mark V, and has a +/-4.5Khz band-pass. Usage of this one would provide 9Khz of band-pass in SSB if placed in the Receive IF path, as opposed to a full 12Khz. Now as far as our current configuration, and the ability to transmit AM, we really do not need to perform any menu changes or re-route our audio from our rack gear to our radio. Just setup the Mark V like you have in the past for AM, minus EDSP, and start transmitting. Just be cognizant that you will definitely be transmitting more lows than you ever have before because you are directly interfacing into the BM. So you may want to compensate for that in your EQ. Unless of course you like the idea of rattling your buddies receiving station with some sub-sonic audio

 

[Slowmover]

“. . it’s the subsonic audio that makes Orange Man Bad”.

 

[Shadetree Mechanic]

You might have to open up the microphone and see what the wires go to.