Can i use the Remora PCB in a different housing?
You can use the Remora PCB in a different housing and with smaller batteries if your application requires it.
For example, the Remora PCB can fit inside a Dart housing and be wired up to a 4 x AA battery pack. We recommend you use Lithium batteries as they last longer and have a stable voltage over their lifetime.
Make sure you use proper anti-static protection when handling the electronics. The power plug on the Remora is a Molex connector part # 0510650200 - click here for the Digikey link.. Make sure you get the polarity right!
How hard should i tighten the Screws?
Oyster and Remora Screws should be tightened up to a torque of 0.7 Newton metres (Nm). Tighten the screws gradually, partially tightening each screw in turn - rather than tightening one as hard as it can go before moving on to the next screw. Also make sure that the seal is clean, seated properly and in good working order.
How much is 0.7Nm?
This can be checked with a torque screw driver. Many installers do not have access to torque screw drivers, and will be installing with various portable drilling machines or manual screw drivers. Care should be taken not to over tighten the screws.
Over tightening to a torque of 1.2Nm will start to fracture the screw bosses. This must be avoided at all costs as the IP rating will be compromised. To test the required tightness without a torque wrench, screw a housing together and note any notches formed on the base, on the rim next to the screw holes. If notches start to form, the torque is too high. These notches are the cover bottoming out on the base. They should be avoided.
Notches like this in the base should be avoided:
|The result of extreme over tightening:|
How Accurate is the GPS positioning?
All GPS results have a degree of inaccuracy in them. This can be because of the position of the satellites (DOP) and other factors like multi-path reflection of the signals.
The receiver attempts to predict what the inaccuracy is and this is reported in the telemetry data coming into Telematics Guru. In order to save battery the Remora powers on the GPS and as soon as the position is within the required accuracy (set in the parameters) it records that and turns the GPS off. By setting the required accuracy to be more accurate the GPS may take longer to get the position and therefore use slightly more battery.
The firmware is smart enough to manage the GPS when the Remora is in a trip and going to be getting regular updates. It will keep the GPS on and manage the power intelligently to allow the GPS to get signals from as many satellites as possible, allowing subsequent GPS fixes to be faster and more accurate. You can set the GPS parameters to require a more accurate position if you need. Remember that this may cause the GPS to use more battery as it will probably need to be on for a longer period.