Hi Marcus,
Sorry for writing to you directly as my query on the gnuradio discuss list
has not come up with any response in the last 2-3 weeks.
Also, apologies for posting the above on the gnuradio list as the usrp-users
list is down for some reason.
I needed some help identifying a rather odd issue I am facing with some new
E320s we acquired as the older E310s are now not recommended for new
designs.
When reading the temperature from the AD9361 I am consistently getting very
high readings, confirmed with direct chip surface temperature measurements -
typically of the order of 60-70C for Rx only streams, and 80-90C for streams
with both Tx and Rx.
My requirements are very humble - the FPGA is not used at all - all data is
processed on the main CPU.
Typical Sample rates are between 1.92 MHz to 30.72 MHz for Rx streams, and
Tx is set to 30 kHz.
The Tx transmits only a CW.
When comparing with the old E310, the temperature difference is about 30C,
with the same underlying code.
Any idea why this is happening or what I am doing wrong.
FYI, stopping the streams actually causes the temperature on the AD9361 to
rise, which is very weird.
The sensor values are read using: usrp.get_sensor(i).to_real() - we only
need the rssi and ad9361_temp sensors.
And the stream start / stop is effected using:
self.uhd_usrp_source_0.stop(), self.uhd_usrp_source_0.start()
Sample rates on the receive are changed using:
self.uhd_usrp_source_0.stop()
self.uhd_usrp_source_0.set_samp_rate(self.rxSamp_rate)
self.uhd_usrp_source_0.set_bandwidth((self.rxSamp_rate*2), 0)
self.uhd_usrp_source_0.set_bandwidth((self.rxSamp_rate*2), 1)
time.sleep(0.5)
self.uhd_usrp_source_0.start()
Fundamentally, the system is used to compute the DOA using either high power
noise sources or CW signals from a TE21 coupler inside the feed of an
antenna.
UHD: 4.8.0.0
Python: 3.12.0
Windows: IOT
Default configuration of USRP:
MCR: 30.72 MHz or 16 MHz
Rx Frequency: 2G - 3G
Tx Frequency: 5G-5.5G
Tx Gain setting: 75 - 80 dB (~10 dBm output)
Rx Gain: AGC
All streams are carried over the 10G SFP modules. No packet losses.
Any help or insight would be greatly appreciated.
Thanks,
Indrajit.
smime.p7s
Description: S/MIME cryptographic signature
