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Topic: Mystery component on Yun board? (Read 42174 times) previous topic - next topic

ShapeShifter

What does "rated at 100 cycles max" mean?  
In this case, a cycle is a single instance of mating and disconnecting the connector. This connector is rated for 100 such cycles, after which the manufacturer does not claim that it will still make connections properly. In other words, it is a low duty cycle connector that is not designed for frequent connections/disconnections. If you are going to use it, plan on leaving the antenna connected and don't mess with it a lot.

acastronovo

It seems the 100 cycles refers to how many times you can physically plug and unplug this connector...if you get the adapter cable you will see that it snaps on with gentle pressure...so my guess is that if you continued to physically plug and unplug this connection...more than 100 times...eventually it would wear out. But as for function, it works well for me, and gave me significant signal boost- wifi signal from 150" away.

here are the parts I used:

http://www.adafruit.com/products/945

http://www.digikey.com/product-detail/en/132171RP/ACX1247-ND/1011924

http://www.digikey.com/product-search/en?site=us;lang=en;vendor=490;Keywords=MXHS83QE3000

sonnyyu

#32
Jun 04, 2015, 06:17 pm Last Edit: Jun 04, 2015, 06:18 pm by sonnyyu
It seems the 100 cycles refers to how many times you can physically plug and unplug this connector...if you get the adapter cable you will see that it snaps on with gentle pressure...so my guess is that if you continued to physically plug and unplug this connection...more than 100 times...eventually it would wear out. ...
You guess is correct. the other side adapter cable will last thousands times more than this connector.

This connector is design for RF calibration purpose only, more  less few times use, but adapter cable is design for RF calibration thousands  RF circuit boards.







Quantumn

#33
Apr 08, 2019, 07:10 pm Last Edit: Apr 08, 2019, 07:16 pm by Quantumn
I have managed to successfully attach an external antenna to the Yun, but it is a hack.

I had misread this thread, bought a "SMA Female Plug to IPX U.FL Female Pigtail Cable" ( http://www.ebay.co.uk/itm/231098912466) , connected it to the Yun and saw no improvement.

Under a microscope, I could see that both the socket and plug were female. (see attached photos).

As I had nothing to lose, I thought I would have a go at creating a pin that would bridge the two female connectors. 1/0.6mm solid core wire fitted snugly in both connectors. I guessed at the correct length. Luckily i seemed to judge it about right and the plug is held firmly on the socket.

Amazingly, it worked. The Yun seems to auto sense the stronger signal. With no antenna connected to the SMA connector, the signal strength was about 35%. With the antenna connected, it bumped up to about 80%. I plugged/unplugged it a handful of times to convince myself it was working.

Obviously, with no soldering, this is might not be the most reliable of connections.

I would be interested to know from an RF expert whether I have managed to fluke a solution or whether the RF signal can jump the gap of a "not great" connection.

Let me know if you can reproduce my results.

Pete.
I know microwave Pete.  There is no 'jumping a gap' with microwave.  You'd need a plasma for that.  In fact as frequencies get higher and higher signal begins to travel only on the outside surface of the conductor to a greater and greater degree.

You've succeeded with your novel pin and I'm about to do the same thing, because my fingers are literally 50x the size of these connectors, otherwise I'd solder in a U.Fl male.  I have access to a PCB microscope at the NW Maker Lab, but my fingers are too big (since I'm old) and I'm not so steady anymore.

One thing to be aware of is, assuming you'd used copper wire, it will oxidize;  this means the outer surface.  Notice all other components are gold-plated.  You have to make this connection gas-tight to prevent this.  I'll use silicone grease ("dielectric grease", auto parts store) to fill my connection.  I always inject it into RJ45's when I'm making up cables, whether they'll go outdoors or not.  I'll do my best to file the ends of the pin flat.

Then I'll hot-glue the wire to the board to reduce strain on the connectors, since this is going in my Tesla. I've rooted it and the Yun will give me remote access to the (hacked) car.

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