[USRP-users] B205mini: 0-value Samples When Switching Center Frequency
Gilad Beeri (ApolloShield)
gilad at apolloshield.com
Fri Oct 27 00:44:42 EDT 2017
I was told by Ettus in the past that nearby hops (X00's of MHz) should take
some tens of microseconds to settle (for the AD936x chip), while I see 3
Can you reconfirm the former saying, or confirm that you also experience ~3
milliseconds of 0's when you change frequency with a delta of tens of MHz?
In addition, I would expect that during the settling time, I will get
garbage data / noise, and not 0 samples. Do you know the reason I get 0's?
On Thu, Oct 26, 2017 at 5:27 PM Marcus D. Leech via USRP-users <
usrp-users at lists.ettus.com> wrote:
> On 10/26/2017 06:43 AM, Gilad Beeri (ApolloShield) via USRP-users wrote:
> Whenever I switch center frequency with a USRP B205mini (changing to a
> nearby frequency), I get 3 milliseconds of 0 samples.
> 1. What's the reason behind that?
> 2. Can I make some changes that will reduce that timespan without data?
> The analog hardware takes a finite amount of time to switch frequencies.
> During that time, there will inevitably be *some* type of glitch.
> A PLL synthesizer will take some amount of time to change frequency.
> Every time you change frequency, you take it out of its converged state, and
> it has to re-converge.
> USRP-users mailing list
> USRP-users at lists.ettus.com
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