I am not easily surpized, but in the weekend tested this:
formatting link
on the spectrum analyzer the result for SSB is very good. You need bandpass filtering at the output of course. Amazing IQ play, no external parts required.
Making SSB with a raspberry pi (more for radio hams)
Nov 13, 2017
5 Replies
How could one possibly transmit on a 750MHz carrier with a Pi? If it were really possible it would make a nice wireless network.
NT
On a sunny day (Mon, 13 Nov 2017 06:50:58 -0800 (PST)) it happened snipped-for-privacy@gmail.com wrote in :
Yes possible, I programmed freq_pi long time ago, it was based on fm_pi by others:
formatting link
The raspies have several build in PLL synthesizers, the new ones have higher clock speeds than my old ones.
The interesting part here is the how to make these modulation types. Audio or pictures or text is encoded to I and Q values, and those are used to control the raspi hardware. Output on one pin, low pass needed for harmonics (GPIO out is a square wave after all). It works for NBFM, SSB, slow scan TV, and FSQ. And why not for other types of modulation, all software.
On a sunny day (Mon, 13 Nov 2017 06:50:58 -0800 (PST)) it happened snipped-for-privacy@gmail.com wrote in :
PS,
formatting link
berry-pi/
Lots of good information! PiRate radio transmitter. LOL. FWIW, my own raspies get loaded with FreeBSD-arm.
Thank you,
Don Kuenz, KB7RPU
Spurious City!
Pity Broadcom(?) don't deliberately put a decent RF generator in there.
Join the Discussion
Have something to add? Share your thoughts — no account required.
Didn't find your answer?
Ask the community — no account required