NX-700/800 25 Pin accessory connector

[Josh]

Can anyone post the pinout of the 25 pin connector?

I can't seem to find much info, the software shows what's programmable on the programmable pins but how about the rest?

I am aware of pre-emphasized RX audio being available, but how about flat audio? Anyone have a clue?

 

[ramal121]

NX700 acc connector

Confused? Shout back...

 

[Josh]

Looks good to me, doesn't look like there's a way to get flat audio out of it though :-/

 

[ramal121]

Well that's why I say ask.

AFO is filtered, squelched audio.
DEO is raw discriminator audio
You choose...

 

[Josh]

Well hey wonderful, because I could use both.

I have an SVR200 attached to one, which is programmed to use filtered audio, whereas the phone patch attached to another requires flat discriminator audio.

-Josh

 

[Josh]

Yup, whipped out the soldering iron and redid my accessory plug and now the audio, via flat discriminator, is working as it should.

Thanks for the help, that .pdf is now saved in my radio manual library.

 

[viet5d]

Well that's why I say ask.

AFO is filtered, squelched audio.
DEO is raw discriminator audio
You choose...

Could you please explain how to use these pins ? Could I connect a microphone (electrect) to pin #6 (MI2)and hear the signal (voice) on these 2 pins (AFO and/or DEO) ? Please help. Thanks

 

[viet5d]

Can anyone post the pinout of the 25 pin connector?

I can't seem to find much info, the software shows what's programmable on the programmable pins but how about the rest?

I am aware of pre-emphasized RX audio being available, but how about flat audio? Anyone have a clue?

Hi, did you performed a test with microphone by connecting directly to pin MI2 (pin #6) of DB25 ?

Could I use the microphone (with J45, 8 pins) connecting to this pin #6 ? How do you test the audio output from microphone ?

Thanks

 

[mmckenna]

I'd have to check my notes at work, but we interfaced a telephone style handset to some of our NX-900's (the 800MHz version of this radio) It works just fine. We fed audio from the mic into one of the pins, audio out from the speaker jack to the handset base which has a speaker that disconnects when the handset goes off hook. There is a PTT line, also.

Programming of the pins is required for PTT. It's actually a pretty simple set up.
You'd need some bias voltage for your electret mic, but if you used a dynamic mic, you'd be OK. Pretty easy to add accessories to these radios.

 

[viet5d]

I'd have to check my notes at work, but we interfaced a telephone style handset to some of our NX-900's (the 800MHz version of this radio) It works just fine. We fed audio from the mic into one of the pins, audio out from the speaker jack to the handset base which has a speaker that disconnects when the handset goes off hook. There is a PTT line, also.

Programming of the pins is required for PTT. It's actually a pretty simple set up.
You'd need some bias voltage for your electret mic, but if you used a dynamic mic, you'd be OK. Pretty easy to add accessories to these radios.

"Programming of the pins is required for PTT" means to activate the microphone (connected to pin#6, MI2), other pin I/O (pin#12, AUX07, for example) has to be programed as Input "External PTT (voice)" ?
Please check with your note if it is the same as you have done.

I use micro dynamic so I can hear/see the voice signal at pin #17 (AFO) ?

Did you use the "DI" (pin#5) ?

Thanks

 

[mmckenna]

Correct, one of the I/O pins needs to be programmed for external PTT voice.

AFO is audio output, and I don't think you will be able to hear your own voice there, but it's worth a try. That is usually for feeding an external source.
DI pin is for data, not for audio. I did not use it.

I'm not at work today, so I don't have those notes. I'll be in the office tomorrow and will post them.

 

[viet5d]

Correct, one of the I/O pins needs to be programmed for external PTT voice.

AFO is audio output, and I don't think you will be able to hear your own voice there, but it's worth a try. That is usually for feeding an external source.
DI pin is for data, not for audio. I did not use it.

I'm not at work today, so I don't have those notes. I'll be in the office tomorrow and will post them.

Today, I test with the radio as thinking with micro. It works in "PA" mode (Public Announcemnt). We have to amplify the audio signal to here the sound at internal speaker. And I can see the signal at pin AFO too. I think in the transmission mode is the same.

I have activated the PA mode by using Key Assignment (square key). I don't know yet how to activate this PA mode through the DB25 connector. Have you tried this option ?

Thanks

 

[nexeradio]

Well that's why I say ask.

AFO is filtered, squelched audio.
DEO is raw discriminator audio
You choose...

Ramal121 Can you please help me with this senario i am having.

My setup is as follow: i have a trunk 6.25 NX radio that is connected back to back to another analog out of band NX radio i am taking the AFO from one radio and feeding it to MIC input on the other radio with 27K inline resistor and Vice versa with External PTT setup to key the other radio.

The quality of the audio is not the best however it works.

do i have to connect to the raw DEO. i have not tried it yet but i will very soon. is there anything else that i can do to improve on audio quality. maybe another resistor value or capacitor?

Cheers

 

[ramal121]

Well the basic problem with Kenwoods is the AFO output is about 250 mVrms and the drive for MI2 on the accessory connector is about 5 mVrms. I'm not sure where you came up with a 27K series resistor but that may not be enough. What I have found to work well is a 5.6K series resistor to a 1K pot. This gives me adjustment range to suite my needs. See thread:

http://forums.radioreference.com/ke...-x180-mobile-cross-band-repeat-heres-how.html

Coupling caps are in the radio and are not needed (unless you want to shape the audio, and analog to analog this is usually not needed).

Now this is for analog to analog, or analog to NXDN. Per the other thread, heed Baycomm's advice. Repeated digital needs to go through a dedicated digital repeater. Using the analog "hole" to connect two digital signals results in audio that is "double vocoded" that is crappy at best.

 

[nexeradio]

Ramal121

Thanks for your help again.

I don't really know how I came up with that number. I guess found it in an old document I followed.

I will try the way you have it setup, it does make
More sense to me than my setup.
I just noticed that I have both grounds not connected insted I have a shield connecting the db25 case in one side only.

My setup is nxdn mobile to analog mobile both NX series.

 

[nexeradio]

I did try your configuration today without the use of 1K pot simply didn't have one handy.

it sounded much better to me. is there anyway i can instead use the DEO PIN instead of the AFO.