Timeline for Why did my FM transmitter mysteriously die?
Current License: CC BY-SA 3.0
11 events
| when toggle format | what | by | license | comment | |
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| Jul 14, 2012 at 22:22 | comment | added | Earlz | Heh, I was wondering why I could get an FM signal from this component without an antennae. But anyway, my understanding is that a part like this doesn't have to be FCC certified because it's not complete. You still need an antennae and other things. FCC certification can only be done on a completed and functional out of the box transmitter. | |
| Jul 14, 2012 at 21:43 | comment | added | Olin Lathrop | @abdullah: It is serious for intentional radiators, which this obviously is since it's intended to radiate, in the commercial FM band no less. Let us know what response you get from the seller. | |
| Jul 14, 2012 at 21:14 | comment | added | abdullah kahraman | Wow! I didn't know this issue was so serious in the US! Sent an e-mail by the way :) | |
| Jul 14, 2012 at 21:08 | comment | added | Olin Lathrop | @abdullah: Generally that's a bad idea because the whole ground plane could become a patch antenna. It doesn't look like any compliance testing was done. If you want to have some fun, ask the seller what the FCC certification ID of this intentional transmitter is. You may suddenly find the product removed from the product list. It is a violation of the law to sell a uncertified intentional transmitter in the US. | |
| Jul 14, 2012 at 20:53 | comment | added | abdullah kahraman | Is it a bad idea to connect the crystal's ground lead to the ground plane, as it can be seen in the photo of the product's PCB? | |
| Jul 14, 2012 at 20:50 | comment | added | Olin Lathrop | @Earlz: Could be a noise issue, but could also be marginal design. If your IIC levels or timing or power voltage or any other parameter aren't fully to spec, random behavior like this can result. Things can appear to work fine for a while with specs violated a little, then fail other times. Does failure correlate with temperature? | |
| Jul 14, 2012 at 20:03 | comment | added | Earlz | I have one more update now. Appears to be a noise issue, not for sure how to fix it though. Definitely not bad solder joints after all | |
| Jul 14, 2012 at 19:07 | comment | added | Earlz | I tried to test the solder joints with a multimeter, but it's hard to be conclusive with it being such a small SMD part | |
| Jul 14, 2012 at 12:19 | comment | added | Olin Lathrop | @Earlz: Sounds like a bad solder joint somewhere. Or possibly a power sequencing startup problem, although that doesn't explain how it failed in the middle of operation. | |
| Jul 14, 2012 at 4:40 | comment | added | Earlz | Also see my update which is quite mind boggling | |
| Jul 13, 2012 at 23:27 | history | answered | Olin Lathrop | CC BY-SA 3.0 |