napster792
Newbie
- Joined
- Sep 30, 2012
- Messages
- 2
Hi guys,
I'm trying to build and air/water bridge, using a Oceanreef M105 (ultrasonic diver transceiver) and a motorola gp series.
I can easily take audio out and mic in from the motorola (gp320), by using a simple M4 to jack 3.5/2.5 adapter. Easy.
From the oceanreef side, I can manage to have an audio out singla (coming from underwater) and a mic in.
What's difficult is how to manage PTT: from the gp320 I may use the VOX function (audio out from the M105) to mic in in the gp. The dilemma is now how to know when there is a communication coming from the air. Is there any way to know from the M4 connector on my gp320 when there is an incoming transmission (which means trigger the PTT on the M105 - audo out from the gp to mic in in the M105). PIN 10 on M4 connector from the gp320 is RSSI, any way to use this signal to operate a trigger (mosfet or simple relay). Incoming traffic will be in the near proximity, then incoming singal is really strong (<1km). If not, I probably have to use an exernal VOX circuit, detecting incomig from air, trigger the M105 PTT.
Any comment/ideas on both possibilies is really welcome.
Thanks
I'm trying to build and air/water bridge, using a Oceanreef M105 (ultrasonic diver transceiver) and a motorola gp series.
I can easily take audio out and mic in from the motorola (gp320), by using a simple M4 to jack 3.5/2.5 adapter. Easy.
From the oceanreef side, I can manage to have an audio out singla (coming from underwater) and a mic in.
What's difficult is how to manage PTT: from the gp320 I may use the VOX function (audio out from the M105) to mic in in the gp. The dilemma is now how to know when there is a communication coming from the air. Is there any way to know from the M4 connector on my gp320 when there is an incoming transmission (which means trigger the PTT on the M105 - audo out from the gp to mic in in the M105). PIN 10 on M4 connector from the gp320 is RSSI, any way to use this signal to operate a trigger (mosfet or simple relay). Incoming traffic will be in the near proximity, then incoming singal is really strong (<1km). If not, I probably have to use an exernal VOX circuit, detecting incomig from air, trigger the M105 PTT.
Any comment/ideas on both possibilies is really welcome.
Thanks
