___ Measure 80 mm from the edge of the board, and mark the antenna wire there.
___ With a pair of sharp diagonal pliers, cut the wire at the 80mm mark.
___ Remove the wire from the board.
___ With some emery cloth or a jeweler’s file, file down any sharp edge at the cut so that it
is flat. Feel the edge with your finger, if you feel a sharp edge then keep filing until it’s
smooth. The goal is to get rid of any sharp edges, as these will reduce the efficiency of your
antenna.
___ Put some masking tape on the two pads on either side of the antenna, to prevent solder
from getting on the pads.
___ Insert the bent end of the wire into the ANT hole on the top of the board. Solder it in
place on the TOP of the board, making sure that it sticks straight out from the board. Clip any
protruding lead on the BOTTOM of the board flush, then solder the bottom pad. The idea is to
not have any antenna lead protruding from the bottom of the board.
___ Solder the antenna wire to the pad on the top of the board, up to the edge of the board.
___ Remove the masking tape coving the side pads.
___ Wrap 3 or 4 turns of masking tape around the RF Module. Slide the heat-shrink tubing
over the antenna wire, then with a heat gun or small torch on VERY low heat, carefully shrink
it over the wire. Wait at least 60 seconds, then remove the masking tape.
Eggfinder RX Serial Options
The purpose of the Eggfinder RX board is to receive the radio-encoded GPS data stream from
your Eggfinder TX board, and to convert the radio signal into a serial data stream that can be
fed into your laptop or tablet. The RX board includes a USB-Serial cable that powers the
board from a standard (Type A) USB port, and provides a serial port for use with most laptop
computers and tablets with a USB port. It works very well with the software setup described in
the Eggfinder Users Guide.
Alternatively, you can use a 2S 7.4V LiPo battery to power the Eggfinder RX board, and a
generic Bluetooth®-Serial board so that you do not have to plug the Eggfinder RX into your
laptop/tablet. You can easily mount the Eggfinder RX board, a Bluetooth®-Serial module, and
a 750 mAH 2S LiPo battery into a small plastic handheld case, giving you a portable receiver
solution for use with a tablet without requiring a cable. We have tried generic “HC-06”
Bluetooth® modules with the Eggfinder RX, they work well enough, particularly with
Android® tablets that may not have a wired serial port. If you want to try this in lieu of the
USB-Serial cable, please consult the Application Notes on the Eggtimer Rocketry web site.
We recommend that you use the included USB-Serial cable for initial testing, then once you
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