3 ms·
The original v4 RTL-SDR has a 1PPM TCXO. The problem is, the tons of shady clones don't. As for the GPSDO, that should be easy to solve at least if the host pl
by mschuster91 1y ago
The original v4 RTL-SDR has a 1PPM TCXO. The problem is, the tons of shady clones don't.
As for the GPSDO, that should be easy to solve at least if the host platform is a Raspberry Pi - the SparkFun NEO-M9N board can be connected to the PPS input of the Pi. The problem is, that thing is expensive.
[1] https://www.berrybase.de/sparkfun-qwiic-gps-breakout-neo-m9n-sma https://www.berrybase.de/sparkfun-qwiic-gps-breakout-neo-m9n...
- BenjiWiebe 1y agoI'm not an interferometry expert, so I don't know what level of precision is required, but usually a GPSDO takes a lot more than a PPS output. A PPS output makes for very accurate timekeeping over long time scales. A GPSDO is a very stable oscillator that gives you precise frequency. Disciplining your oscillator with a PPS signal would be much harder than with the typically used 10 MHz signal. And I don't think an RPi would do very good at putting out a highly stable MHz signal disciplined to a PPS input.