Changes between Version 2 and Version 3 of Tutorials/Wireless/FR3/Sine


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Timestamp:
Aug 14, 2025, 6:41:01 PM (5 days ago)
Author:
seskar
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  • Tutorials/Wireless/FR3/Sine

    v2 v3  
    33=== Generating and Observing Basic FR3 Sine Wave ===
    44
    5 ==== Description
     5This experiment transmits a single-tone (sine) IF at 1.5 GHz from a USRP-2974 (Krypton) into a Pi-Radio FR3 front-end, which up-converts to an FR3 carrier (example: 10 GHz). A second Pi-Radio front-end down-converts the over-the-air signal back to 1.5 GHz for a USRP-2974 receiver, where a simple ASCII DFT spectrum viewer is used to verify the tone. The Pi-Radio web UI is used to configure the FR3 conversion.
    66
    7 This experiment uses two USRP 2974s for baseband processing and two PiRadio SDRs for up/down conversion to FR3 bands. Transmit USRP sends the basic sinewave at 1.5 GHz to the PiRadio SDR which upconverts it to 10 GHz and sends it over the antenna to the receiving antenna on second Pi-Radio which down coverts it to 1.5 GHz and send it to USRP for further processing (DFT) and display
    8  
    97==== Prerequisites
    108
     9* COSMOS account and active reservation in Sandbox 1.
     10* Familiarity with USRP-2974 (embedded X310, 10 MHz–6 GHz, 160 MHz BW).
     11* FR3 hardware access (2× Pi-Radio FR3 front-ends) and the fr3-tutorials.ndz disk image for the USRPs.
    1112
    1213==== Resources required
     14
     15* Nodes: sdr1-piradio, sdr2-piradio, rfdev-sdr1-piradio, rfdev-sdr2-piradio.
     16* Antennas: 2× Vivaldi (Tx/Rx) connected to the Pi-Radio front-ends. (See FR3 hardware pages for antenna layout.)
     17* Browser access to Pi-Radio web UI on the rfdev-* nodes (port 5006).
    1318
    1419==== Tutorial Setup ===
    … …  
    3540}}}
    3641 1. After a minute (giving internal PCs enough time to boot), ssh to the USRP 2974s nodes and start the chrome remote desktop session (follow the  [wiki:/UserGuide/RemoteAccess/ChromeRemoteDesktop instructions for setting remote access]).
    37  1. Open the Chrome browser and access the [wiki:/Hardware/FR3#ControllingthePi-RadioFR3SDRs Pi-Radio configuration pages] using these URLs
     42 1. Open a Chrome browser sessions in each of the two CDRs and access the [wiki:/Hardware/FR3#ControllingthePi-RadioFR3SDRs Pi-Radio configuration pages]
    3843{{{
    3944 https://sdr1-piradio.sb1.cosmos-lab.org:5006
    … …  
    4146}}}
    4247
    43 === Experiment Execution ===
     48==== Experiment Execution
    4449
    45 On '''sdr1-piradio''' start the transmitter
     50Use the Pi-Radio web UI Frequency panel on both rfdev pages (Tx and Rx) and set:
    4651
     52* Low LO Frequency (GHz): 1.500000
     53* High LO Frequency (GHz): 10.000000
     54
     55This example pairs a 1.5 GHz IF with a 10 GHz high-side LO (and a 1.5 GHz low-side LO) to place the RF tone at ~10 GHz, and back to 1.5 GHz on the receive path. (Exact placement depends on mixer sign/paths; the screenshot below shows the working settings used in this demo.) Leave Filters, Gain (except where noted), and LO Suppression at defaults for the first run
     56
     57On the transmitter (sdr1-piradio), start a 1.5 GHz sine at 5 MHz baseband tone:
    4758{{{#!shell
    4859tx_waveforms --args "resource=RIO0" --subdev A:0 --freq 1.5e9 --ampl 0.7 --gain 30 --wave-type SINE --ant TX/RX --rate 10e6 --wave-freq 5e6
    … …  
    5465}}}
    5566
    56 In the figure below, you can see the outcome
     67You should observe a stable, narrow spectral line(s) in the DFT display near the configured tone at 5MHz (with side-markers set by the viewer). The figure below shows both Pi-Radio UIs (left: Tx FE, right: Rx FE) with Low LO = 1.5 GHz and High LO = 10 GHz, the TX console (bottom-left) and the ASCII DFT (bottom-right) around 1.5 GH
    5768
    5869[[Image(pi-sine.png, width=1000px)]]