Bob McGwier wrote:
The USRP is not in the same league with the USRP2. The on board
oscillator is much better but external oscillators will make it even
better. So the answer is a big yes, the USRP2 will be better.
Actually, I need to disagree again here :)
The master oscillator on the USRP1 is actually exceptionally clean. It
may be as much as 20ppm off in frequency and will drift with
temperature, but it is very clean down to 10 Hz offsets. It is amazing
what you can do with a cheap oscillator as long as you don't make it
tunable or temperature compensated.
As soon as you make an oscillator temperature compensated or voltage
controlled, as we need to in the USRP2, you have to go to much greater
lengths (and expense!) to get comparable phase noise performance. So
the USRP2 will have roughly the same phase noise performance as the
USRP1. The USRP2 will be lockable to an external oscillator, but that
will only affect phase noise at less than 100 Hz offsets.
Matt
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