Eggtimer Rocketry Flight Computer Instrukcja Użytkownika Pobierz pdf (Strona 26)

___ Put the bent end of the antenna into the hole on the top of the board marked ANT, but

do not solder it in. Tape it down so that it points straight out from the board

___ 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 80 mm 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 rob RF power and cause unwanted

harmonics in your output signal.

___ Cover the pads on either side of the ANT pad with some masking tape to keep solder

off of them… a solder bridge between the ANT pads and the ground pads next to them will

prevent the signal from getting out.

___ Insert the bent end of the wire into the ANT hole on the top of the board. Solder it in

place on the ANT pad 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.

The idea is to not have any antenna lead protruding from the bottom of the board.

___ Solder the antenna wire to the exposed pad on the top of the board, all the way up to the

edge of the board. Remove the masking tape covering the pads on the sides.

___ 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.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Assembly of your Eggtimer TRS is now complete. Inspect the board carefully, looking for

“cold” solder joints or incomplete solder joints. Cold solder joints appear dull instead of shiny,

and may appear as blobs of solder and not have the nice “wetting” of the pad that you will see

with good joints. A magnifying light is good for checking the board. We do not recommend

using flux remover or other cleaners on this board, as they may not be compatible with the no-

clean flux in the solder.

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Eggtimer Rocketry Flight Computer Instrukcja Użytkownika Strona 26