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APX 7500 + headset issue

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snpr1992

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Good evening,

We have trucks with Sigtronics US-45s headsets. We are trying to tie the headset intercom system to the radio by way of the front connector of the high power radio. It is a 25 pin Dsubb/ J600 connector. I have found the pinout for the radio and is listed below:
J600-1 AUX_PTT
J600-2 RS232_RX= UARTA_TX= DCE_TX
J600-3 RS232_TX= UARTA_RX= DCE_RX
J600-4 RS232_RTS= UARTA_RTS= DCE_CTS
J600-5 BUS(+) (SB9600)
J600-6 RX_AUDIO
J600-7 AUX_RX
J600-8 AUX_TX
J600-9 RX_AUDIO
J600-10 GND
J600-11 GND
J600-12 DAC_OUT
J600-13 EMERGENCY
J600-14 BUS(-) (SB9600)
J600-15 VIP_OUT_1
J600-16 IGN
J600-17 RS232_CTS=UARTA_CTS=DCE_RTS
J600-18 GND (legacy)
J600-19 RESET (SB9600)
J600-20 A+
J600-21 GND (SHIELD)
J600-22 SW_B+
J600-23 BUSY (SB9600)
J600-24 SPEAKER(-)
J600-25 SPEAKER(+)

The pins per the manufacturer that are supposed to interface with the system are 1, 11, 15, 18, 24, 25.

After tying their system to the pins, we are able to hear radio traffic and cause the radio to transmit (red light on head and MDC transmission), but we are unable to transmit audio. Since the high power XTL 2500 has the same pinout and connectors I have also tried investigating the issue there and found someone with a mic that had a similar problem but there was no updated post of how it was resolved.

After contacting the manufacturer again they suggest that we would have to put a jumper on the radio to change pin 15 from VIP OUT to AUX_MIC. Any info on that change would be appreciated as well. We certainly have no interest in taking apart the radio if that is what it entails.

Also, we have tried in software under AUX_MIC to change the sensitivity 80mv or 300mv, neither help and also tried AUX_PTT. Also tried, enable accessory in the remote head options to no avail.

Thanks for your assistance!
 
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W0JJK

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Joined
Jan 25, 2006
Messages
617
I have connected our David Clark system to APX6500.

The following is what we used.

Pin 1 and 14 as grounds.

Pin 16 it PTT.

Pin 21 is Filtered Audio. This audio is not affected by the Volume knobs on radio. It is affected by the volume on the Headset system.

Pin 23 is Aux Mic. I found with David Clark it works better with 80 mv setting.

Here a the APX manual. Page 537 and 538 have the information about 26 Pin connector.
https://magnumelectronics.files.wordpress.com/2015/07/apx_mobile_service_manual_6875964m01_j.pdf
 

snpr1992

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Messages
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Location
Palo Pinto, TX
Thanks for the info W0JJK. However, we will be using the 25 pin connector on the front of the remote mount high power radio not the 26 pin trapezoidal connector.

I think I'm going to have to pull the TIB off and change a pin to pick up AUX_MIC. So I'm going to check that out when I get a chance and see if its something I can do.
 

crazyboy

Member
Joined
Apr 10, 2004
Messages
778
Location
NJ
Good evening,

We have trucks with Sigtronics US-45s headsets. We are trying to tie the headset intercom system to the radio by way of the front connector of the high power radio. It is a 25 pin Dsubb/ J600 connector. I have found the pinout for the radio and is listed below:
J600-1 AUX_PTT
J600-2 RS232_RX= UARTA_TX= DCE_TX
J600-3 RS232_TX= UARTA_RX= DCE_RX
J600-4 RS232_RTS= UARTA_RTS= DCE_CTS
J600-5 BUS(+) (SB9600)
J600-6 RX_AUDIO
J600-7 AUX_RX
J600-8 AUX_TX
J600-9 RX_AUDIO
J600-10 GND
J600-11 GND
J600-12 DAC_OUT
J600-13 EMERGENCY
J600-14 BUS(-) (SB9600)
J600-15 VIP_OUT_1
J600-16 IGN
J600-17 RS232_CTS=UARTA_CTS=DCE_RTS
J600-18 GND (legacy)
J600-19 RESET (SB9600)
J600-20 A+
J600-21 GND (SHIELD)
J600-22 SW_B+
J600-23 BUSY (SB9600)
J600-24 SPEAKER(-)
J600-25 SPEAKER(+)

The pins per the manufacturer that are supposed to interface with the system are 1, 11, 15, 18, 24, 25.

After tying their system to the pins, we are able to hear radio traffic and cause the radio to transmit (red light on head and MDC transmission), but we are unable to transmit audio. Since the high power XTL 2500 has the same pinout and connectors I have also tried investigating the issue there and found someone with a mic that had a similar problem but there was no updated post of how it was resolved.

After contacting the manufacturer again they suggest that we would have to put a jumper on the radio to change pin 15 from VIP OUT to AUX_MIC. Any info on that change would be appreciated as well. We certainly have no interest in taking apart the radio if that is what it entails.

Also, we have tried in software under AUX_MIC to change the sensitivity 80mv or 300mv, neither help and also tried AUX_PTT. Also tried, enable accessory in the remote head options to no avail.

Thanks for your assistance!

I always go to the read connector for audio, but with that said the pinouts they provided you for the front definitely seem wrong. I don’t have a service manual in front of me so you will have to confirm this for yourself, but it seems it should be 1, 8, 9, 10.
 
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