Tx Booster Mod

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I thought I would share this simple process of adding wifi booster to Tx.

Before I start I would just like to make a couple of comments.

1.  The boosters available have a typical signal output range from 0 to 20dBm.  It would be good to know what your Tx output is so that the upgrade would work well.  I sent a message to Futaba JP asking the value of my Tx and in turn they directed me to their UK representative who informed me it was 20dBm.  Now you may think that this is good, but is not.  Reason being, if input signal from Tx is already strong, then output, coming out of the wifi booster, will be saturated and the final output signal's quality will be negatively impacted.  Also if the signal is too weak, then booster may not be triggered.  In this scenario you would want your Tx signal output range to be about 10-16 dBm.  Luckily for me after further research I found the Test documents for my Tx which peaked at 14dBm in use, IIRC.

2.  There are many antennas with varying dBm.  You would require a 6dBm antenna for this application.

3.  With regards to Rx, whilst chatting with Futaba tech, the only thing that is important is the exposed wire part on the antenna.  So it does not make a difference if you install a longer antenna.  I will be installing a longer antenna on my Rx so that I can get it further up, away from the body shell and into the air.

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So here are the bits...

 

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Firstly remove battery and unscrew case.  Follow the antenna wire to locate where it is plugged into PCB.  Gently lift the plug upwards to remove from socket.

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Next, for this Tx, pinch the antenna tabs and pull the antenna to release it from the housing.

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To seal the Tx, I purchased a rubber plug from ebay, pierced a hole in it and passed the wire through.

SMA plug on one end IPEX plug the other.

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Connect IPEX to PCB and insert rubber plug into antenna hole on housing.

Do not use cable longer than 30cm as this will deteriorate signal.

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Think about where you want the unit mounted and drill holes.  You can use velco but I wanted to make sure it was secure.

Should you wish to remove it at a later date you can purchase rubber plugs from ebay and insert.

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And here's a look from the other side.  Secured with nuts.

When using nut and bolt method, ensure it will not foul anything when re-assembled.

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Unit mounted and case screwed together. 

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Another picture showing mounted unit SMA connector installed as well as antenna.

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And a look from the other side.

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Next, sort out power to the unit.

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2s could of been used but I opted for 3s, to ensure strong signal.

Wires shortened and mounting velcro added.