It’s actually quite difficult to do this at high frequencies… 125khz is possible yes… even easy… but 13.56mhz is very difficult because of the skin effect induced into the metal our the needle. I would love to see it though.
Surely if the field is strong enough 
There has to be some of the signal reaching the coil.
Yes but by then you’ve down out the modulation and can’t get any data over the field
But. It might still work to light the led
Yes. Wasn’t it what needed testing out the factory - or before implanting?
If the manufacturer checked the orientation with that method, they could simply apply a “LED out first” or “LED out last” sticker on the packaging and problem solved. They wouldn’t even have to be careful how they insert the chip in the syringe.
Well, it’s in our build package for this product that the assemblers test the chip for function after it’s been sealed and then orient it with led coming out first in the syringe. That’s how they are supposed to be built before shipping to us from our factory… but anyway it’s quite difficult to build a test rig to power it after already in the needle. We’ve tried before with amplified 13.56mhz coils and got nothing… maybe it’s possible, but we’d rather just have our factory follow the build package if you know what mean.
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Don’t think I have any means of generating a large high power nfc field… just my phone and a proxmark easy
Guess I’ll just have it implanted assuming led last, since you said that’s the most common
Also remember whatever orientation it is in, the chip will move backward during healing toward the injection site about 6 mm. That’s the most common backward migration during healing.
You know what? I have an old oversized IAR injector and a field detector. I’ll give it a spin in the lab next week. We have a high-power high-frequency waveform generator somewhere - I think. Hopefully it’ll go down to 10s of MHz, I think it’s designed for much higher frequencies.
Or I could dig out my old ham radio rig that goes down to the 10MHz band and outputs 100W. But I’d be afraid to blow the final stage if there’s too much SWR.
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@amal
Just checking, haven’t read anyone say either way any issues with my planned next chip perpendicular in the wrist?
45 mins out
lemme check…
so if that mark across the top of your wrist is the position in question, then I would say this would be ok for a flex but not suggested for an x-series since it will likely lay across bone. It’s not what I would consider “high risk”, but just not suggested. I would go between the bones (parallel with) if you wanted to put it there.
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Ok, I was thinking perpendicular would yield a better angle for scans, but don’t wanna mess anything up
perhaps, but for fixed readers you can also angle your arm if necessary… usually 45 degrees is all that’s required… or if you are talking about a phone then just angle the phone.
The deed is done
Led was how it was expected to be
Pain killer ice and hand wrap now
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Pretty good start 
Little advice (that actually helps a lot): Keep the arm up as much as you can, works wonders against the swelling!
Wish you all the best
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You got some vitamins to? Thats a big help with the collagen building.
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Think I’m going to skip the vitamins for now, I think I’m in the “if wants to move it’s going to” camp
But now I’m curious about mifare, how close can it be to xNT chips?
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You’ll want good space so your reader doesn’t get confused.
Ok so crosstalk is still a thing
Can a xm1 work as a nfc? Confused on the overlap