[Hackrf-dev] 5 MSPS sample rate

[Russell Hande]

Believe it or not, at least in my case, I have not seen any
(noticable) signal drop with the noise drop. Which is why as of lately
I have been preferring 2msps mode.

On Sat, Aug 3, 2013 at 3:14 PM, Michael Ossmann <mike at ossmann.com> wrote:

> On Fri, Aug 02, 2013 at 12:06:08PM -0400, Russell Hande wrote:

>>

>> Mainly specs I think. I use 1, 2, 4 and 8 (8 is the min spec).

>>

>> Going under the spec actually provides the best stability and least

>> noise.

>

> I suspect that is because the ADC is performing poorly when

> underclocked.  You may be unintentionally filtering the signal by doing

> that.  So there may be less noise, but there also may be less of the

> signal you want.

>

> While we currently allow you to operate the ADC below spec (which is 7.5

> Msps minimum), the performance probably gets worse the lower you go.  In

> the future we will implement decimation in the ARM, permitting lower

> effective sample rates while operating the ADC within spec.  (See the

> issues list.)