I dont know if anyone has tried this but I have always wanted to know how my sub was doing down in the deep usualy dark blue/green sea.
2 small units one the TX and the other a recorder brain that collects all the sensory data.Then sent to a small dashboard on your radio,no interference that I could detect just locate the TX as far away from the radio RX as possible and that does it,the antena is a very thin coated stainless whip that runs outside of the casing I have not tried it on the inside yet.
Well now I have found the way to do it and it works!and its been out there for a long time! Just not tested on RC Subs.
Eagle Tree Systems makes the fantastic system that can do so many things its incredible I had to try it in a sub.
I thought that only 900mgz would work not 2.4 or other fancier frequencies so I ordered the the 900 mgrz unit.
I first installed the free soft weare on my computer and then followed the instructions from there and even downloaded the manual for hookup ect.Great instructions and very detailed.
This sensor recorder tetemetry system is truly incredible in its scope of capabiliteies and eas of operation,just about every concieavable option can be displayed either on a small poratable dashboard or live on your laptop at the pond in real time,even GPS coordenents and grafing displayed to Google Earth!
Now I dont know if the GPS will work under water I havent perchased that option yet but I know it would work while on the serface,probably a few feet underwater.
You want depth ya thats right depth is posible since the sensors use barometric pressure and with some tweaking It is posible to get a read out live of the depth she is running at thugh not calibrated to meters or feet but a live representation of change in depth numericly,later I might be able to get the manufacturer to make the option in a depth gage ect read out.
Even the internal pressure of the Casing can be detected !Ballast tank and pump pressures measured.Even speed is an option.
Important data such as RX battery pack performance and percetage remaining,Lipo users would know even the temperature of the pack,watts ,volts.
The dashboard unit displays 7 screens of sensor data.
If the radio RX battery gets to low the telemtry system shuts off and that way your model is safe and under control.
Another very neat thing is the user selectable warning beeps or alarms ,set to go off at lets say 5 ft depth a beep or selected number of beeps will warn if that limit is reached,same for battery volts,temp,ect.
A full range of safety warnings for you sub.
Also analog and digital sensors can be added and customized to the existing range of sensors that are available from Eagle Tree and very afordable.
Also great for bench testing and r and d work,get all the parimiters necessary viewed before you install and go to the lake.
Every part or module can be perchased as a kit or seperatly so that easy upgrade or multiple model tetemetry can be acomplished.
there is even a OSD or on screen disply for use with live vedeo that will display all of the above peramiters directly over your existing vedeo link.
The usual vedeo paramiters are used ,a bouy ect. is needed.
You wonder how much for all this capability about 380.00$ from Eagle Tree and its made in the USA.Comes with motor temp,RPM shaft or motor with mini magnets and sensor,CD,TX,RX,USB cable, Yharnes for even servo glitches,amps used,travel indiction,voltage,if you have abad servo it will show up.
Dash board unit ,pitot tube,tubbing and clip for the dashboard to radio attachment.
Great support and teck feeback.
Go to http://www.eagletreesystems.com/Plane/plane.html
I will be making more tests on this system and will post what I find.
Finaly telemtry that works for subs!
Prop RPM,motor RPM,setup by gear ratio and able to read 2 drives at once.
Dave Amur Ship Yard