On 31/03/2025 11:51, zhou via USRP-users wrote:
Hi,
What is the max input signal power to RF ports in X310? There is a
spec in the below link:
https://www.ettus.com/wp-content/uploads/2024/01/X300_X310_Spec_Sheet_2024-01-23.pdf
There are max output powers, but not input power.
I am using UBX-160 daughterboard.
In https://kb.ettus.com/X300/X310_Getting_Started_Guides, it says that
"Never apply more than -15 dBm of power into any RF input."
ChatGpt says that "*UBX 40*: *+10 dBm* (10 mW)"
What is the max input signal power?
Thanks for any comments,
Zhou
-15dBm is somewhat conservative, but if that's what the manufacturer
recommends, I'd go with that, rather than a
hallucination produced by ChatGPT.
The receivers on USRPs are generally designed to be connected to an
antenna, and as such have sensitive, lower-noise
front-ends. Such front-ends generally don't tolerate higher input
powers without damage--and +10dBm *IS* high
input power for a radio receiver.
One may have gotten used to the relatively-insensitive inputs of
laboratory spectrum analyzers, which often have
inputs that can tolerate considerably-higher power levels, but are
insensitive at levels expected from direct
connection to an antenna. But USRPs are designed for antenna
connection. If you want to use them as
a laboratory spectrum analyser, you'll need to use attenuators.
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