[USRP-users] B200 Output Frequency

Marcus D Leech patchvonbraun at gmail.com
Thu Jan 23 17:50:28 EST 2020


You’re presumably transmitting a 10kHz tone at 80Mhz?

Is your counter locked to the same reference as the USRP?


Sent from my iPhone

> On Jan 23, 2020, at 5:30 PM, Remco Vink via USRP-users <usrp-users at lists.ettus.com> wrote:
> 
> 
> All,
> 
> I am currently trying to generate a stable sine wave out of the B200 TX port.
> The B200 is referenced to both a 10Mhz and 1PPS coming from a cesium clock.
> 
> However when measuring the output on a Frequency Counter the frequency seems to be changing slightly  throughout.
> For generating the Sine I tried both Gnuradio and setting a carrier frequency, and I tried the ettus TX waveforms example.
> 
> The code currently outputs the following:
> [INFO] [B200] Actually got clock rate 16.000000 MHz.
> Now confirming lock on clock signals...
> Ref: unlocked
> Ref: locked
> get master CLK_rate: 16000000.000000
> [INFO] [B200] Asking for clock rate 32.000000 MHz... 
> [INFO] [B200] Actually got clock rate 32.000000 MHz.
> get TX freq: 80000000.000000
> 
> What is the cause of difference between the Frequency Counter and the Claimed output, and can this be fixed?
> <IMG_20200123_162036.jpg>
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