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Originally Posted by PiccoRacing
(Post 11724023)
Have you physically inspected any of the genuine AMB transponder internals? They do it with a single PIC microcontroller. The FCC docs have internal pics. I'd have provided direct links, but the forums want some undisclosed post count achieved before I can post URLS.
https://apps.fcc.gov/oetcf/eas/repor...id='NXYRC3' I searched the FCC site for the number printed on the old transponders, "NXYAMBGP2", but came up with nothing. If you send me the links for the photos of the older AMB transponder via PM, I'll post them. P.S. That's a lot of parts in the RC4! |
I sent you a PM with the direct links to the FCC data.
I do not know anything about the RC4 ID formats... sorry. |
Originally Posted by mos-leung
(Post 11724261)
Also, do you have more information on the ID number for RC4 ?
Did you see any ID used in RC4 same as previous AMBrc transponder? |
Originally Posted by PiccoRacing
(Post 11724334)
I sent you a PM with the direct links to the FCC data.
I do not know anything about the RC4 ID formats... sorry. Thanks for the links. Here's the link for the devices marked "NXYAMBGP2": http://apps.fcc.gov/oetcf/eas/report...'NXYAMBGP2' There's a whole lot of extra active devices in this one too, other than the PIC microprocessor. EDIT: It looks like a 5 MHz resonator or crystal, so there's no way the PIC12C671 is generating the carrier by twiddling its pins. |
What kind of resonators are those? They look like fuses...
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Originally Posted by PiccoRacing
(Post 11724799)
What kind of resonators are those? They look like fuses...
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looks like a 5 year old soldered that AMB...
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Here's a quick update on the code compression. I've done 20 numbers so far, and it definitely looks like the PIC12F683 will hold at least 32.
For the moment, I'll simply step to the next selection when the jumper block is present on power-up. |
Originally Posted by whitrzac
(Post 11724995)
looks like a 5 year old soldered that AMB...
You are probably looking at a prototype; these are usually hand-soldered. The only thing that would be hand-soldered on production units would be the power wires. |
The test results show that the RC4 radiated emissions were just 2.9 dB below the limits at 560.5 MHz. That's a bit too close for comfort!
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Originally Posted by howardcano
(Post 11726071)
The test results show that the RC4 radiated emissions were just 2.9 dB below the limits at 560.5 MHz. That's a bit too close for comfort!
I might be able to talk my way into some time in an area setup for vector network analysis, where I know they have a very nice spectrum analyser. |
Originally Posted by howardcano
(Post 11726052)
My own efforts at hand-soldering surface mount components are quite entertaining! That's the reason I'm using through-hole components on this design, at least for the moment. My last RC project, a dynamic timing module for use with ESCs that don't have the feature, was surface-mount, and it was a real challenge for my shakey hands.
You are probably looking at a prototype; these are usually hand-soldered. The only thing that would be hand-soldered on production units would be the power wires. There's nothing like soldering LEDs/resistors 2x the size of salt under a 10x microscope:rolleyes: I could do better on that AMD freehand without any magnification...:sneaky: I repaired this not to long ago... This is a $7k mixer/recorder that someone plugged into 48v(18v rated) and left it fry more pics http://s272.photobucket.com/albums/j...und%20devices/ http://i272.photobucket.com/albums/j...s/DSCN0104.jpg |
Originally Posted by freexray
(Post 11726454)
Any idea where that frequency component would originate? not a square wave harmonic surely? would be the 56th harmonic.
At higher frequencies, even short conductors become excellent antennae! |
My head hurts
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Originally Posted by howardcano
(Post 11726677)
My earliest posts showed a strong second harmonic component in the output field of the older AMB transponder, most likely due to driving the tank single-ended. The RC4 probably also uses a single-ended drive. This would give plenty of even-order harmonics.
At higher frequencies, even short conductors become excellent antennae! Thanks |
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