14 Mar
2013
14 Mar
'13
1:13 a.m.
As to the specific question about throttling - having a throttle block in a flow graph
should /only/ be done if there is no hardware source or sink (usrp or soundcard). If the
throttle block is in the flow graph at the same time as a hardware block you have the
two-clocks problem.
As for optimal sample rates using the USRP the slowest rate supported by the hardware
(i.e., the highest decimation rate) is still more than enough for recording/capture of
P25. 2M is overkill unless you're trying to capture an entire band 2 MHz wide.
In playing back a file and displaying the result in a GUI is the case where you need a
software throttle...
Max
--- In op25-dev(a)yahoogroups.com, <md123@...> wrote:
Hi guys! I am wondering what is the optimal sampling rate for capturing of P25
transmissions. My main problem (aside from not getting audio) is that, while I can
successfully capture at upwards of 2.0M, I can only play back at around 56k without
greying out the gui. I am a little confused about this because I thought the throttle
would control the clock speed for play back. Any suggestions on configuring the settings
would be greatly appreciated.
Cheers,
Matt
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