Power Perch User`s manual - Featherweight Altimeters
Contents
1. Assembly and Mounting Assemble the parts as shown and place on your avionics sled to locate the best position for the Raven Power Perch Stack the 2 included restraint spacers together with the holes aligned with each other Place the restraint spacer behind the battery with the holes aligned as shown a TE L h AS ama A P NN r a Zo M r The magnetic sensor should be placed close to the airframe no more than 1 from the edge if using the small magnet or 1 75 if using the large magnet Either end can face forward with no loss of function in the flight configuration Drill the mounting holes for the restraint spacers If a 3 32 drill bit is used the included 4 40 screws will thread themselves securely into the plywood If the screws are to be retained with the included nuts on the back side of the sled use a 7 64 or 1 8 bit to provide clearance for the threads The restraint spacers can be glued to each other and glued to the sled if desired Install the battery restraint with screw to fix it into position for locating the other holes Use the Raven battery Power Perch assembly to locate the mounting holes for the Power Perch and the Raven Drill 2 holes for the Power Perch TATS a owe f v s i eee P vor 3 f AN or A we 2 S k wy Either mark the holes and drill or simply drill through the board mounting holes with the Power Perch in place Install two 4 40 screws to2. at is damaged or that has its cover puffed up When the charger s LED turns from red to orange the cell is fully charged If the cell has been very discharged it could take 1 2 hours to fully charge it Usually the cell would start out with a higher state of charge and it would take less time than that Always recharge the battery and or measure its voltage before flight If it s less than 4 V a recharge 1s recommended When the charger cuts off the charge and turns the LED from red to orange the cell s open circuit voltage should be around 4 1 4 15 V While the LiPo battery included with the av bay has a long life there are limitations The magnetic switch used to turn the av bay on and off consumes power even when the unit is powered down Because of this the av bay should not be assembled with the battery installed for extended periods Up to a week is o k but after several weeks with the battery assembled the battery will be significantly run down
3. secure the Power Perch to the sled No spacers are required as long as the sled is made of an insulating material such as wood or fiberglass Not carbon fiber or Aluminum Note that the two Power Perch mounting holes are also electrical terminals that can be used to provide power to a low powered accessory compatible with single Lipoly cell operation such as an RDF beacon from Big Red Bee or Telemetrum The magnetic switch turns that power terminal on and off along with the Raven The end of the Raven with the screw terminals is adequately restrained via the Perch and the screw terminals There are 2 options for restraining the other end of the Raven 1 Use the Raven s original screw and spacer This is the safest option though it does not provide the most convenient way to move a Raven from one Power Perch to another 2 Use the Raven restraint included in the Power Perch kit to hold down the aft end of the Raven Attach a spacer to the sled in the vicinity of the Raven s aft mounting hole to keep the Raven s baro sensor from resting against the sled The Raven restraint then holds the Raven directly against the spacer The user is responsible for any damage to the Raven that may occur if the baro sensor is resting against the sled Magnetic switch operation The magnetic switch senses magnetic fields in the plane of the sled perpendicular to its edge The included magnet should be oriented as shown below for optimum range a e
4. w The switch changes state when either end of the magnet leaves the vicinity of the sensor To turn the Raven on or off put either end of the magnet close to the sensor and then remove it Tips for trouble free operation e Before use at the launch range familiarize yourself with the correct magnet orientation and the way the magnet changes the switch state when it is removed e If the sensor seems to miss the magnet movement try moving the magnet more slowly e Avoid magnetizing materials permanently connected to your av bay sled Do not store the magnet in contact with a steel av bay threaded rod for example Battery Management The Power Perch does not include a USB port for charging the battery To charge the LiPo battery used in the av bay you will need to provide your own charger or obtain a Featherweight USB Battery Charger To use the Featherweight USB Battery Charger plug the battery in to the board the connect the USB cable to the board and finally to either a USB port on your computer or a USB wall wart The LED on the board will be red while the battery is charging and will turn orange when charging is complete The charger takes care of charging the battery and won t overcharge the cell unless there is a failure in the system Because of the remote possibility of failure you should take precautions when charging such as not charging unattended or with flammable material nearby Never charged a cell th
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