Missile Works RRC2+ User Manual page 2

3. Use it as the main altimeter or as a backup altimeter with any other brand/make altimeter to provide redundant altimeter
recovery.
Mounting the RRC2+
The RRC2+ needs to be mounted solidly on a "sled," or plate made of plywood, fiberglass, or other rigid material. Mounting is
accomplished by utilizing standard 4-40 size machine screws and nuts. Insulated Washers or Standoffs can be found on the
Missile Works website or big box stores like Lowes, Home Depot, Ace Hardware, etc.
The RRC2+ can be mounted in any direction on the sled. There is no forward or aft orientation. It may also be mounted on
one of the bulk plates in the avionics bay. DO NOT USE VELCRO to mount the unit. This may cause static discharge
problems and damage to components!
The RRC2+ should be mounted above the sled a minimum of 1/8" on standoffs or insulated washers. The barometric sensor
mounted on the bottom of the altimeter has tiny holes in it to sample air. They must NOT be blocked by mounting too tight on
the sled. If you can slip a credit card between the bottom of the RRC2+ and sled, you're good to go!
Batteries
The RRC2+ is designed to be powered by a standard 9-volt alkaline battery. You can use any battery within 3.7V to 10V, but
there are other considerations when using these alternate battery types. These considerations are covered fully in the RRC3
User Manual. Batteries must be mounted solidly to the sled, usually via a battery box (available on the Missile Works website)
or securely zip tied to the sled. If using a battery clip it is advisable to use several wraps of electrical tape around battery and
clip, before securing it to the sled. Always check the battery voltage before installing & before each flight, and verify your
"beeped" voltage on the pad at power-up! Even new batteries can be defective and have sub-par voltage.
Connections
All the RRC2+ terminals are clearly labeled:
BAT+ and BAT -Connect power from your battery and power switch here
DROGUE Low current e-match for first charge that fires (apogee)
MAIN Low current e-match for second charge that fires (main parachute at 500 ft)
Connections on the altimeter are by means of screw terminals which raise and lower a tiny set of vice jaws. Strip your wire
ends NO more than 1/4". Place the bare wire end into jaws and snug down the screw. Now give a light tug on the wire.
Congratulations! If your wire remains in place, you have just averted the number 1 failure with altimeters and electronic
deployment -- loose wiring. Using the "pull" test on EVERY connection you make, will assure successful and safe flights.
Be SURE to connect the positive [ + ] on your battery to the terminal screw on altimeter marked BAT+ . Then do the same
for the [ - ] negative terminal screw. DO NOT REVERSE THE POLARITY!
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