Also notice that the input power to the X310 (the ADC described in the first link) might not be relevant to the UBX-160 daughter board input with its preamplifier and mixer or RF frontend in general. With a BasicRX (ie balun -> ADC direct connection, no frontend/mixer/preamp) I have measured the ADC output amplitude to input amplitude to be linear up to +6 dBm input power, which I use with synthetic data generated from an FPGA for best SNR with no distorsion.
Best, JM ----- Mail original ----- De: "Marcus D. Leech" <patchvonbr...@gmail.com> À: "usrp-users" <usrp-users@lists.ettus.com> Envoyé: Lundi 31 Mars 2025 17:57:55 Objet: [USRP-users] Re: Max Input RF Power in X310 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 | 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 | 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. BQ_BEGIN _______________________________________________ USRP-users mailing list -- [ mailto:usrp-users@lists.ettus.com | usrp-users@lists.ettus.com ] To unsubscribe send an email to [ mailto:usrp-users-le...@lists.ettus.com | usrp-users-le...@lists.ettus.com ] BQ_END _______________________________________________ USRP-users mailing list -- usrp-users@lists.ettus.com To unsubscribe send an email to usrp-users-le...@lists.ettus.com _______________________________________________ USRP-users mailing list -- usrp-users@lists.ettus.com To unsubscribe send an email to usrp-users-le...@lists.ettus.com
