Handmic adapter - 1-pin 2.5mm Moto Talkabout to 1-pin Yaesu TRRS

[KD7RJC]

I was cleaning up my office and ran across a pair of Motorola NTN8867A handmics that I can't remember when I got or why. My best guess is they were at a thrift store or something.



I'd like to use these on a pair of Yaesu HTs I have, an FT2DR and an FT5DR. Unfortunately natively the handmics seem to have an elongated 2.5mm TRS jack, while as best I can tell the Yaesus use 3.5mm TRRS jacks.



I did open one up to look inside, it looks like it's wired fairly simply:



It looks like the two pinouts aren't crazy-different on the surface if the info I found is accurate, the Motorola appears to be a Talkabout single-pin pinout like this:


while the Yaesu pinout seems to be like this:


The problem I'm having, which is why I've created a thread, is I'm having a devil of a time finding an adapter. Motorola simply used so many connectors that Google is useless, their two-pin 2.5/3.5 connectors come up. Does anyone know of a ready-made adapter that will go from from 1-pin Talkabout to Yaesu? If not then I can either try to replace the cable itself with a 3.5mm TRRS soldered on to the handmic PCB, or buy the necessary stubs to make the adapter while leaving the factory cable intact, but if there is a ready-made adapter it would at least let me test quickly.

 

[AB4BF]

I was cleaning up my office and ran across a pair of Motorola NTN8867A handmics that I can't remember when I got or why. My best guess is they were at a thrift store or something.

View attachment 168004

I'd like to use these on a pair of Yaesu HTs I have, an FT2DR and an FT5DR. Unfortunately natively the handmics seem to have an elongated 2.5mm TRS jack, while as best I can tell the Yaesus use 3.5mm TRRS jacks.

View attachment 168005

I did open one up to look inside, it looks like it's wired fairly simply:
View attachment 168006
View attachment 168007

It looks like the two pinouts aren't crazy-different on the surface if the info I found is accurate, the Motorola appears to be a Talkabout single-pin pinout like this:
View attachment 168008

while the Yaesu pinout seems to be like this:
View attachment 168009

The problem I'm having, which is why I've created a thread, is I'm having a devil of a time finding an adapter. Motorola simply used so many connectors that Google is useless, their two-pin 2.5/3.5 connectors come up. Does anyone know of a ready-made adapter that will go from from 1-pin Talkabout to Yaesu? If not then I can either try to replace the cable itself with a 3.5mm TRRS soldered on to the handmic PCB, or buy the necessary stubs to make the adapter while leaving the factory cable intact, but if there is a ready-made adapter it would at least let me test quickly.

How about fleaBay?

2.5mm Stereo to 3.5mm 4 Contact Plug for sale | eBay

Get the best deals for 2.5mm Stereo to 3.5mm 4 Contact Plug at eBay.com. We have a great online selection at the lowest prices with Fast & Free shipping on many items!

www.ebay.com

 

[KD7RJC]

How about fleaBay?

2.5mm Stereo to 3.5mm 4 Contact Plug for sale | eBay

Get the best deals for 2.5mm Stereo to 3.5mm 4 Contact Plug at eBay.com. We have a great online selection at the lowest prices with Fast & Free shipping on many items!

www.ebay.com

The problem of any random adapter is no way of ensuring that the right positions on the TRS connector end up on the right positions on the TRRS connector. If the tip is 1, and the shield is 3 or 4, it needs to be TRS 1 to TRRS 1, TRS to TRRS 3, and TRS 3 to TRRS 4.

I did receive some jumpers today and I tried making these connections, but it did not work. I might have to look at impedance of the microphone when PTT is engaged since they run on the same wire. I might have to monkey with the Motorola handmic's circuitry in order to change it to work at the levels that the HT expects.

 

[EusebioSalgado]

Hi,

I was trying to make something similar but the other way around. I was trying to make an adapter to connect a gaming headset (3.5mm TRRS aux) to a Motorola T5000 - because my kids say that they would like to have over the ear with boom mic and feel like a heli pilot (shrug, I thought it would be a nice project to undust the soldering iron).
I have found the pinout of the motorola T series - same than you refer in your first post.
But I am missing couple of details:
1) by chance do you know the impedance?
2) by chance do you know how to activate the PTT - I was thinking about wiring it to a PTT finger button but I am unsure if PTT should be open? closed?
3) I am having a little bit of a hard time finding the elongated 13 mm jack - time for me to visit couple of electronic shops.

Thanks!

 

[KD7RJC]

Hi,

I was trying to make something similar but the other way around. I was trying to make an adapter to connect a gaming headset (3.5mm TRRS aux) to a Motorola T5000 - because my kids say that they would like to have over the ear with boom mic and feel like a heli pilot (shrug, I thought it would be a nice project to undust the soldering iron).
I have found the pinout of the motorola T series - same than you refer in your first post.
But I am missing couple of details:
1) by chance do you know the impedance?
2) by chance do you know how to activate the PTT - I was thinking about wiring it to a PTT finger button but I am unsure if PTT should be open? closed?
3) I am having a little bit of a hard time finding the elongated 13 mm jack - time for me to visit couple of electronic shops.

Thanks!

I had found a listing for impedance somewhere but I did not make a note of it. I suspect impedance was part of my issues. I think the PTT was a normally-open momentary but it's been awhile since I did anything with this. No idea where to get the jack.

 

[rf_patriot200]

It would be far Safer to just use the Correct Mic which is Only about $30 and works on Both the radios you mentioned. YAESU SSM17A [SSM17A] - $31.95 : R&L Electronics, Amateur radio store