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Daniel H 2023-07-07 16:34:24 +02:00 zatwierdzone przez GitHub
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@ -28,7 +28,7 @@ there, as 99MHz FM is is in the FM radio bands. MAKE SURE YOUR ANTENNA IS SMALL!
There is also a MUCH STRONGER harmonic at ~155.726MHz FM, in the 2m amateur radio band. PLEASE, PLEASE, PLEASE don't use a large There is also a MUCH STRONGER harmonic at ~155.726MHz FM, in the 2m amateur radio band. PLEASE, PLEASE, PLEASE don't use a large
enough antenna for it to be able to send that very far. And this signal will actually reach FURTHER than the AM one because it enough antenna for it to be able to send that very far. And this signal will actually reach FURTHER than the AM one because it
is a shorter wavelength and therefore sends better using a short antenna. ***__PLEASE add the low pass filter I described.__*** is a shorter wavelength and therefore sends better using a short antenna. ***__If you want to use a longer antenna, PLEASE add the low pass filter I described, it fixes the noise enough for big antennas to be fine.__***
## How it works ## How it works
@ -49,7 +49,7 @@ It has the following jobs:
- **An extra resistor of about 50-400 ohms may be added from the AI+ point to the AI- point to load the signal.** This is optional, but - **An extra resistor of about 50-400 ohms may be added from the AI+ point to the AI- point to load the signal.** This is optional, but
*can* clean up a little bit of noise if you have long cables. *can* clean up a little bit of noise if you have long cables.
**ERRATA :warning:**<br> **IMPORTANT :warning:**<br>
If you aren't an asshole, ***PLEASE*** add the low pass filter as mentioned in the Disclaimer: If you aren't an asshole, ***PLEASE*** add the low pass filter as mentioned in the Disclaimer:
- Add the 100ohm resistor (R3 in new schematic) between pico and antenna - Add the 100ohm resistor (R3 in new schematic) between pico and antenna
- Wire a 2nF (2000pF) capacitor (C1 in new schematic) between the new start of the antenna and ground - Wire a 2nF (2000pF) capacitor (C1 in new schematic) between the new start of the antenna and ground