Hi Marcus,
Thanks for your quick response. I still have some doubt. In X410 spec, there is
clear information on max input rf power: +14dBm for f<3GHz, +17dBm for f>3GHz
https://www.ni.com/docs/en-US/bundle/ettus-usrp-x410-specs/page/specs.html#GUID-50099182-F4E2-42EC-BBBD-7E336B07FFBE__GUID-B1D08221-A553-4A47-805A-896B34C98C07
If the max input signal power is -15dBm, the difference between X310 and X410
is too big.
Any further inputs will be appreciated.
On Monday 31 March 2025 at 16:59:11 BST, Marcus D. Leech
<[email protected]> wrote:
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 X300/X310 Getting Started Guides - Ettus Knowledge Base, it says that
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X300/X310 Getting Started Guides - Ettus Knowledge Base
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"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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