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ms14 development instruction
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MS14 will enter into reset mode once daughter board send a
low level
to the COLD_RESET pin, it
will boot again when the low level signal is removed.
3.3
Antenna and ANT Hole
3.3.1
Antenna
MS14 has two radio paths. They are lead to
ANT0
and
ANT1.
The ANT0 radio is the main antenna
for RX and TX. The ANT1 radio is the diversity antenna for RX only.
By default, MS14 is loaded shipped using 2.5 dB chip antenna. It also provides the option to use
external antenna for higher gain/ directional requirement.
R76 and R77 are path select resistors for main radio path. To use external antenna for main radio
path, developer should remove the 0ohm resister from R77 and solder it on R76. This will disable
ANT0 antenna and enable J4 (i-pex) connector. Then connect the external antenna on J4 and use
it.
3.3.2
Antenna Hole
The ms14 enclosure has a removable antenna hole which can be used hold the:
External Antenna as mentioned above
Antenna from the daughter board
3.4
Daughter Board Design Clearance