![]() ![]() I don't have that much money, and it would be ideal if all the parts I need to assemble the device could be purchased and shipped online. If anyone here is willing to help me out that would be greatly appreciated. This person on stack exchange ( ) approximated that the power output is roughly 37mW. Here’s how to analyze these filters in your next design and some important simulation tips. The maximum voltage from the GPIO Pin I am using is ~3.3V with a max current draw of 16mA. The pi filter is a simple, yet powerful LC filter circuit. The software I am using with my pi can be found at: I have a tuned antenna already built, and I just need something to block out all harmonics outside of the standard 200 kHz bandwidth of my desired transmission. The frequency I have chosen to operate on is around 87.9 MHz. I want to know if there is a simple, easy way for me to construct a bandpass filter extension for my pi. Traditionally Hoya make screw on ones while Cokin make a holder with adapter rings that take square filters (there are lots of others but these are two major amateur brands). Normal SLR camera lenses have a thread on them for mounting filters on them. I contacted a few people regarding this issue for assistance, but I was unable to find the right information I am looking for. Re: Using filters with Pi-NoIR V2 and M12 lens mount. I would like to deprive the FCC of their most common argument against the Free Radio Movement regarding interference, as much as I can.) (I'm aware what I am doing is highly illegal, I am doing this for activism purposes and am not concerned with the FCC's regulations, I just don't want to interfere with anybody else's broadcast or even worse, mess with government bands. The output signal is very dirty, since the carrier signal is a square wave it has all sorts of nasty harmonics, and before I connect an RF amplifier to my Pi I NEED to filter it. ![]() I found this post made by someone wanting to get Redshift to do the same. Ive downloaded both CLI and GUI versions of Redshift, however they dont seem to allow me to have the blue light filter on the whole time, which is what I need. It's really good, and I was able to get a range of at least 1300+ feet when hooked up to a homemade wire antenna connected directly to the GPIO Pin 7, and one of the RPi's ground terminals. However, I cant be using the screen with so much blue light in it. The software uses the DPLL clock frequency and modulates it with a microphone audio input, and spits the RF signal through one of the GPIO ports. I installed some software for my Raspberry Pi 3 Model B to use the device as an FM Transmitter. ![]()
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