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Today's Topics:
1. GPSDO on usrp2 (Dario Lombardo)
----------------------------------------------------------------------
Message: 1
Date: Mon, 28 May 2012 10:00:23 +0200
From: Dario Lombardo <[email protected]>
To: [email protected]
Subject: [USRP-users] GPSDO on usrp2
Message-ID:
<CAOYJJfttNvJXjQ7pamV+PTBuy6mr8jmMtDLL8pfzJP=p9wn...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hello everybody
I'm trying to use my gpsdo, but I'm not sure to have set it up correctly.
$ /usr/local/share/uhd/utils/usrp_burn_mb_eeprom --key gpsdo
linux; GNU C++ version 4.5.1 20100924 (Red Hat 4.5.1-4); Boost_104400;
UHD_003.004.000-1fab7e9
Creating USRP device from address:
-- Opening a USRP2/N-Series device...
-- Current recv frame size: 1472 bytes
-- Current send frame size: 1472 bytes
-- Found a Jackson Labs GPS
-- Setting references to the internal GPSDO
-- Initializing time to the internal GPSDO
Fetching current settings from EEPROM...
EEPROM ["gpsdo"] is "internal"
Done
Is it right? Or should I set it to NONE?
Then, the jumper in J510 is set to 2-3... should be fine. The E led on the
front panel is turnen on.
With this config if I run kalibrate, I have a high error rate
$ ./kal -c 37 -x
linux; GNU C++ version 4.5.1 20100924 (Red Hat 4.5.1-4); Boost_104400;
UHD_003.004.000-1fab7e9
-- Opening a USRP2/N-Series device...
-- Current recv frame size: 1472 bytes
-- Current send frame size: 1472 bytes
-- Found a Jackson Labs GPS
-- Setting references to the internal GPSDO
-- Initializing time to the internal GPSDO
UHD Warning:
The hardware does not support the requested RX sample rate:
Target sample rate: 0.270833 MSps
Actual sample rate: 0.271739 MSps
kal: Calculating clock frequency offset.
Using GSM-900 channel 37 (942.4MHz)
average [min, max] (range, stddev)
- 19.021kHz [-19063, -18975] (88, 25.709314)
overruns: 0
not found: 6
That can be ok if the satellite signal is bad.
Now the question is: how can I be sure that the problem is related to the
GPS signal and not to some wrong configuration? Are there any other tools
that can be used to check the GPSDO?
Thanks anyone that wants to help me :).
Dario
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