- Posts: 409
Where the Heck is the RF Chip?
07 Nov 2018 18:41 #71621
by C0ckpitvue 777
Where the Heck is the RF Chip? was created by C0ckpitvue 777
I'm trying to take captures for a bad little micro that's been rebranded,the original name was the yifei Phantom which is called now the the sproutoy Phantom.The tx is different and so is the protocol.I'm trying to take capture but don't see a rf chip to solder the jumper wires.If anyone can assist and is familiar with this kind of t.x please chime in.I attached a few screen shots..
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07 Nov 2018 20:11 - 07 Nov 2018 22:17 #71625
by goebish
Replied by goebish on topic Where the Heck is the RF Chip?
I'd connect the analyzer to these pins and gnd to battery pack -
That's not the RF chip (that's the smaller one) but that should be easier to solder wires to this one.
Also, I'd remove this screw that almost connects a pin of the MCU to the crystal of the transceiver
That's not the RF chip (that's the smaller one) but that should be easier to solder wires to this one.
Also, I'd remove this screw that almost connects a pin of the MCU to the crystal of the transceiver
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07 Nov 2018 20:42 - 07 Nov 2018 21:13 #71627
by goebish
Replied by goebish on topic Where the Heck is the RF Chip?
Looking at how the antenna and the crystal are connected to the transceiver, and the very few passive parts around it, that could be a LT8910 
Still, if it's running @ 1Mbps or 250kbps in NRZ line coding mode and FEC disabled it might be possible to emulate it ...
Still, if it's running @ 1Mbps or 250kbps in NRZ line coding mode and FEC disabled it might be possible to emulate it ...
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08 Nov 2018 09:12 #71643
by goebish
Replied by goebish on topic Where the Heck is the RF Chip?
Seems MISO & MOSI are there but no clock nor csn, try again like that please:
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10 Nov 2018 03:00 - 10 Nov 2018 03:10 #71700
by goebish
Replied by goebish on topic Where the Heck is the RF Chip?
Do not turn power on until you are sure there are no solder bridges 
Also, better remove the batteries while you're soldering.
Now that you have some dead boards, use them to practice soldering wires to those tiny legs ...
Tip: use 30awg stranded silicone wires (doesn't melt...) and 0.5mm leaded soldering wire (Sn60Pb40).
Always get a good brand for the soldering wire, never buy it from the usual cheap websites
Also, better remove the batteries while you're soldering.
Now that you have some dead boards, use them to practice soldering wires to those tiny legs ...
Tip: use 30awg stranded silicone wires (doesn't melt...) and 0.5mm leaded soldering wire (Sn60Pb40).
Always get a good brand for the soldering wire, never buy it from the usual cheap websites
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