[USRP-users] Posible error in b200 documentation

Francisco Albani francisco.albani at gmail.com
Thu Nov 30 15:04:05 EST 2017


Hi!

In *"Changing the Master Clock Rate"* (
https://files.ettus.com/manual/page_usrp_b200.html#b200_mcr ) I see this:

*[...] The clock rate can be set to any value between 5 MHz and 61.44 MHz
[...]*

But I found that to be false, and able to lower the *master_clock_rate*
down to *220 kHz*:

uhd_usrp_probe --args="master_clock_rate=220e3"
linux; GNU C++ version 4.9.2; Boost_105500;
UHD_003.009.HEAD-0-g43639b7a

-- Detected Device: B200
-- Operating over USB 3.
-- Initialize CODEC control...
-- Initialize Radio control...
-- Performing register loopback test... pass
-- Performing CODEC loopback test... pass
-- Asking for clock rate 0.220000 MHz...
-- Actually got clock rate 0.220000 MHz.
-- Performing timer loopback test... pass

I also tried lowering it to 2 MHz inside a working tx application
(with an external demodulator) and went fine.

Hope it helps.

Bye!
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