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| author | Michael West <michael.west@ettus.com> | 2019-10-07 16:41:15 -0700 |
|---|---|---|
| committer | Martin Braun <martin.braun@ettus.com> | 2019-10-11 12:26:12 -0700 |
| commit | 4042a319fd29bd5be7b28ce7d3383a2eccaeb7b8 (patch) | |
| tree | dd7920882198ca6f6522c16d6bb36b183b89ef8b /host/docs/usrp_n3xx.dox | |
| parent | 96dd54c77a50e7b1f3f618ca48f6c41bf95dcf3e (diff) | |
| download | uhd-4042a319fd29bd5be7b28ce7d3383a2eccaeb7b8.tar.gz uhd-4042a319fd29bd5be7b28ce7d3383a2eccaeb7b8.tar.bz2 uhd-4042a319fd29bd5be7b28ce7d3383a2eccaeb7b8.zip | |
N3xx: Remove close-in noise on TX
Some close-in noise was observed on TX when using external references.
This change reduces the noise by changing U19 to select the GPSDO when
references are set to external. Also included is a change to properly
read and apply settings from the configuration file. This allows the
user to further quiet the transmission by adding 'enable_gps=False' to
the configuration file in order to power off the GPSDO.
Signed-off-by: Michael West <michael.west@ettus.com>
Diffstat (limited to 'host/docs/usrp_n3xx.dox')
| -rw-r--r-- | host/docs/usrp_n3xx.dox | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/host/docs/usrp_n3xx.dox b/host/docs/usrp_n3xx.dox index 052f20ee9..18a8a023b 100644 --- a/host/docs/usrp_n3xx.dox +++ b/host/docs/usrp_n3xx.dox @@ -664,6 +664,9 @@ and time. auto usrp = uhd::usrp::multi_usrp::make( "type=n3xx,clock_source=external,time_source=external"); ``` +To reduce phase noise, it may be necessary to power down the GPSDO when using +an external reference. To do this, just add `enable_gps=False` to the +configuration file in `/etc/uhd/mpm.conf` (see also \ref page_configfiles). Note: When disabling the GPS with `enable_gps=0` in the configuration file, or |