On 03/10/2018 12:59 AM, Sailor Jerry wrote:
Thanks a lot Nick, is there way to find out if the PLL is locked or
not? Can it be done via SW or I need to probe MUXOUT of U101. What
should I see there?
The reason I need to know it, I want to make sure I'm locked to
external 10 MHz. Now for some reasons I see the input tone few tens
of KHz off from where I expect to see it.
There is a ref_locked sensor, you can read it with get_mboard_sensor():
https://files.ettus.com/manual/classuhd_1_1usrp_1_1multi__usrp.html#a2d3c327bcb83fd274e05e3ca95d1ac95
The on-board clock is 2.5PPM.
On Fri, Mar 9, 2018 at 9:52 PM Nick Foster <bistrom...@gmail.com
<mailto:bistrom...@gmail.com>> wrote:
Without an external reference, the onboard 40MHz VCTCXO will
handle creating a decent reference without the benefit of the PLL
locking it to a 10MHz reference. Wouldn't be much use otherwise.
On Fri, Mar 9, 2018, 9:46 PM Sailor Jerry
<sailorje...@scmarinetech.com
<mailto:sailorje...@scmarinetech.com>> wrote:
Guys, thank you so much for your support, you are awesome!
Now I feel myself as complete idiot. I removed GPSDO.
Disconnected the 10MHz clock, by USRP is still working and it
seems to be on more or less correct correct frequency. I
clearly can see the input tone on fft utility.
Is there some other clock source I'm unaware off? Can I see
the ADF4001 lock status? Here is the output I'm getting:
linux; GNU C++ version 5.3.1 20151219; Boost_105800;
UHD_003.009.002-0-unknown
-- Loading firmware image:
/usr/share/uhd/images/usrp_b200_fw.hex...
-- Detected Device: B210
-- Loading FPGA image: /usr/share/uhd/images/usrp_b210_fpga.bin...
-- Operating over USB 3.
-- Detecting internal GPSDO.... No GPSDO found
-- Initialize CODEC control...
-- Initialize Radio control...
-- Performing register loopback test... pass
-- Performing register loopback test... pass
-- Performing CODEC loopback test... pass
-- Performing CODEC loopback test... pass
-- Asking for clock rate 16.000000 MHz...
-- Actually got clock rate 16.000000 MHz.
-- Performing timer loopback test... pass
-- Performing timer loopback test... pass
-- Setting master clock rate selection to 'automatic'.
-- Asking for clock rate 32.000000 MHz...
-- Actually got clock rate 32.000000 MHz.
-- Performing timer loopback test... pass
-- Performing timer loopback test... pass
On Fri, Mar 9, 2018 at 9:09 PM Sailor Jerry
<sailorje...@scmarinetech.com
<mailto:sailorje...@scmarinetech.com>> wrote:
That would explain it , thanks :-)
On Fri, Mar 9, 2018 at 9:07 PM Nick Foster
<bistrom...@gmail.com <mailto:bistrom...@gmail.com>> wrote:
I uh what? I don't see why that would be the case. The
whole reason U103 exists is to switch between a GPSDO
(if present) and an external reference.
You might wait for the official Ettus response for
this if you don't want to take responsibility for
blowing it up, but I drew the schematic and I say
you're fine.
Incidentally, very early prototypes of the B200 used a
neat PIN diode switch ring which would allow
outputting the GPSDO signal as well as using either
the reference port or GPSDO as a clock input. I can't
remember why it didn't make it into production, but
one side effect would be that if misconfigured, you
could damage hardware. Maybe that was it. ;)
Nick
On Fri, Mar 9, 2018 at 8:48 PM Marcus D. Leech
<mle...@ripnet.com <mailto:mle...@ripnet.com>> wrote:
On 03/09/2018 11:44 PM, Sailor Jerry wrote:
Thanks. Shall I ignore that sentence from USRP
B2x0 Series manual "The B200 and B210 cannot
support an external 10 MHz reference if a GPSDO
is already present on the motherboard. If an
external 10 MHz is to be used, the GPSDO needs to
be physically removed from the device beforehand."?
I think that advice is still correct, but I cannot
remember why. Nick?
On Fri, Mar 9, 2018 at 8:32 PM Marcus D. Leech
<mle...@ripnet.com <mailto:mle...@ripnet.com>> wrote:
On 03/09/2018 11:25 PM, Sailor Jerry wrote:
Would be happy to restore it to original
condition :-)
I'm using the uhd_rx_cfile to capture the
data. How do I control U103 from this app? I
don't see any command line arguments for
that? Do I need to rebuild it?
You'd have to add that, inserting a call to
set_clock_source() at an appropriate place.
The example apps (and this is one) don't
necessarily expose all available features.
On Fri, Mar 9, 2018 at 8:08 PM Marcus D.
Leech via USRP-users
<usrp-users@lists.ettus.com
<mailto:usrp-users@lists.ettus.com>> wrote:
On 03/09/2018 08:11 PM, Nick Foster wrote:
It's a slick mod though. See the
zero-ohm resistor bridging U103 pins 1
and 3? Remove it, and you'll return the
B210 to factory standard.
Assuming no other modifications have
also been made. =)
Nick
Your eyes are much better than mine....
On Fri, Mar 9, 2018 at 4:31 PM Marcus
D. Leech via USRP-users
<usrp-users@lists.ettus.com
<mailto:usrp-users@lists.ettus.com>> wrote:
On 03/09/2018 07:22 PM, Sailor
Jerry via USRP-users wrote:
HI Marcus, I see your point and
also saw the schematic. The
previous owner told me that this
particular board was modified to
have 10 MHz be brought out to the
outside connector. I did verify it
with the scope and indeed saw the
10 MHz coming out. I don't know if
it's one of the standard factory
options or just some custom
modifications (the board has
Olifantasia label on it). Will
take a closer look at pins 3 and 1
of U103 as you suggest. If they
are bridged indeed then I guess
simple removal of GPSDO would do
the trick.
That is NOT a factory-standard option.
On Fri, Mar 9, 2018 at 4:10 PM
Marcus Müller
<marcus.muel...@ettus.com
<mailto:marcus.muel...@ettus.com>>
wrote:
Dear Sailor Jerry,
I'm not sure I'm following
here: The 10 MHz connector is
hardware-wise
connected only to inputs, not
to anything that can output
anything;
compare the schematic[1] on
page 1. So, I'm pretty certain
your device
can't be condigured to have
the 10 MHz connector be an
output for
anything.
Can you maybe describe the
problem you're having?
Best regards,
Marcus
[1]
https://files.ettus.com/schematics/b200/b210.pdf
On Fri, 2018-03-09 at 23:51
+0000, Sailor Jerry via
USRP-users wrote:
> I inherited the B210 board
that has the 10 MHz connector
configured
> as an output. I wonder if
anyone is aware of this
configuration and
> if it's possible to
reconfigure it to accept the
external 10 MHz
> input.
>
> My current plan is simply
remove GPSDO and hope for the
best.
>
> Attached are two pictures of
my board. One is with GPSDO
inserted and
> another one with GPSDO removed.
>
> Thanks a lot!
>
>
>
>
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