Hi!
I just got my ClockTamer and physically connected CMOS (1) output to USRP's "Ref In".
When running kalibrate I get worst values than with usrp's internal clock reference:
# /usr/src/kalibrate-uhd/src/kal -c 121 -x
linux; GNU C++ version 4.8.1 20130603 (Red Hat 4.8.1-1); Boost_105300; UHD_003.006.002-rc2
-- Opening a USRP2/N-Series device...
-- Current recv frame size: 1472 bytes
-- Current send frame size: 1472 bytes
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 121 (959.2MHz)
average [min, max] (range, stddev)
- 35.148kHz [-35151, -35145] (6, 1.788396)
overruns: 0
not found: 0
I tried to adjust Fosc values a few hertz up and down, but I allways get same results.
Of course I'm doing something wrong, but I'm too new on this matter, so any help would be appreciated.
Default values that came with ClockTamer are:
HWI: LMX=2080 LMK=1010 OSC=20
VER: ClockTamer SW=1.3 API=1
Fosc: 20'000'000 Hz
Fout: 52'000'000 Hz