- Category: Radio basics (XRF, URF, ERF & SRF)
- Last Updated on Tuesday, 19 May 2015 08:25
Possible Antenna selection
Left to Rigth, Wire whip, U.FL, U.FL to SMA Pigtal, End launch SMA
U.FL Connector Bottom: note the gold middle connetion this should the the one soldered to the middle pad on the footprint.
U.FL Connector Top
Antenna lengths for wire a wire whip
433 1/4 wave = 164.7mm
868 1/4 wave = 82.2mm
915 1/4 wave = 77.9mm
R001 - XRF v1.5: End launch SMA, Note the top left leg has been cut short
R001 - XRF v2: End launch SMA
R001 - XRF v2: U.FL
R002 - URF: Wire whip
R003 - ERF: Wire whip
R004 - SRF & R005 - SRF-U: Removing the Chip ant(for best results remove the inductor first then snap off), External Antenna connetion(pin 8)
B088 - XinoRF: Wire whip hole
B009 - Explorer Plus: U.FL
B009 - Explorer Plus: Wire whip
R010 - SRF-Stick: Wire whip
R011 - ARF: End Launch SMA top
R011 - ARF: End Launch SMA bottom
R011 - ARF: Wire whip
R012 - RFµ-328: Wire whip
R013 - RFµ-328-Bare: with RFM12B and wire whip
R016 - Slice of Radio: U.FL
R016 - Slice of Radio: Wire whip
The XRF v2 and a few other product have the U.FL pads pre tinned with solder (lead free) and some have bare pads.
For pre tinned device you can use the following method for attaching a U.FL connector.
Using tweezers hold the U.FL in on place with a very slight down pressure.
Heat one of the long side pads till the solder reflows. You can move it around a little with the tweezers while the one pad it hot to get the alignment right.
With one pad sodlered the U.FL will stay in place and you can reflow each of the other pads to finish.
If you have un-tinned pads, tin just one of the long pads first. You only need a small amount of solder not a huge mountian. Using tweezers hold the U.FL in on place with a very slight down pressure.
Heat the long side pads till the solder reflows. You can move it around a little with the tweezers while the one pad it hot to get the alignment right.
With one pad sodlered the U.FL will stay in place and you can solder each of the other pads to finish. Again you will not need huge amounts of sodler just enough to flow between the pad and the connector