3 ms·
He says he uses the GPIO 4 pin[0], and recommends using a bandpass filter [0]: https://youtu.be/Hyq6_IZ-2fE?t=1197 https://youtu.be/Hyq6_IZ-2fE?t=1197
by amingilani 7y ago
He says he uses the GPIO 4 pin[0], and recommends using a bandpass filter
[0]: https://youtu.be/Hyq6_IZ-2fE?t=1197 https://youtu.be/Hyq6_IZ-2fE?t=1197
- crankylinuxuser 7y agoThats why I need to make a programmable filter network... The antennas for Tx/Rx are rated for 50MHz-1200MHz. The Rtlsdr is capable of 24MHz-1.7GHz, and the Rpitx is capable of 100KHz-1.5GHz. Using a generic bandpass from 50MHz-1200MHz would allow combing down the powers of said frequency. Whereas a proper filter network could selectively notch out a few MHz window to prevent spurious transmissions. That device would also be very useful for things like the HackRF, PLUTO, and LimeSDR. As much as they claim they generate clean signals, they still have problems with harmonics, sometimes at weird powers (as in fractional exponents, not wattage).