On 31/03/2025 12:09, Mark Gannet wrote:
Just to follow on. The BasicRx is +10 dBm. I've been using that as a
max to the BasicRx for quite a while without issue. But the UBX-160
knowledge base indicates -15 dBm. I'd assume if you're using the UBX
that you'll be using the configurable on-board amplification (up to
31.5 dB).
https://kb.ettus.com/UBX
The basic_RX has NO analog gain elements at all. It's basically just a
transformer-coupling to the ADCs, so your limit is
the limit of the ADCs.
On Mon, Mar 31, 2025, 8:59 AM Marcus D. Leech
<patchvonbr...@gmail.com> 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 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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