Changes between Version 6 and Version 7 of Hardware/FR3


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Timestamp:
Aug 14, 2025, 3:51:41 PM (3 weeks ago)
Author:
seskar
Comment:

—

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  • Hardware/FR3

    v6 v7  
    2121=== Controlling the Pi-Radio FR3 SDRs
    2222
    23 To facilitate remote configuration and operation, the FR3 hardware units offer a browser‑accessible web control interface as shown in the figure below.
     23The Pi-Radio front-end exposes a browser UI with collapsible panels for Frequency, Filters, Gain, LO Suppression, Control, and Information. The landing view shows these sections and provides quick navigation for common RF tasks.
     24  [[Image(pi-browser.png, 600px)]]
    2425
    25 [[Image(pi-browser.png, 600px)]]
     26Collapsible panels for: Frequency, Filters, Gain, LO Suppression, Control, and Information. Use these to tune LOs, select per-chain filters and gains, adjust LO leakage nulling, and toggle board-level options.
    2627
    27 Key features include:
     28* Frequency settings panel: Two entries with sliders set the mixer local oscillators:
     29 * Low LO Frequency (GHz) — sets the “low-side” LO used in the two-stage up/down-conversion chain.
     30 * High LO Frequency (GHz) — sets the “high-side” LO.
     31Use the numeric box for fine increments and the slider for coarse moves. Together, these LOs place the desired FR3 RF channel while keeping IF in the supported sub-6 GHz range.
     32  [[Image(pi-frequency.png, 600px)]]
    2833
    29 * Frequency settings:
    30 [[Image(pi-frequency.png, 600px)]]
     34* Filters panel: Per-chain drop-downs select the active RF/IF path for RX0, RX1, TX0, and TX1. The bypass option routes around the filter network; select a non-bypass entry to engage the appropriate bandpass path for that chain.
     35  [[Image(pi-filters.png, 600px)]]
    3136
    32 * Filters:
    33 [[Image(pi-filters.png, 600px)]]
     37* Gain panel: ndependent gain controls (in dB) for RX0, RX1, TX0, and TX1. Adjust with the slider or type a value in the numeric box. Use modest steps to avoid clipping or over-driving the front-end.
     38  [[Image(pi-gain.png, 600px)]]
    3439
    35 * Gain:
    36 [[Image(pi-gain.png, 600px)]]
    37 
    38 * LO Supression:
    39 [[Image(pi-suppression.png, 600px)]]
     40* LO Supression: DC bias trims for the I and Q paths on each TX chain (TX0 I/Q bias, TX1 I/Q bias, in volts). Small adjustments here null residual LO feed-through and balance IQ, reducing the tone at the carrier when the transmitter is idle. Start near 0 V and sweep slowly while observing the carrier leakage.
     41  [[Image(pi-suppression.png, 600px)]]
    4042
    4143* Unit controls:
    42 [[Image(pi-control.png, 600px)]]
     44  * Use Internal Reference — lock synthesizers to the on-board reference; clear this if using an external reference.
     45  * Use Internal Reference for Low Side — apply the internal ref to the low-side LO as well.
     46  * Disable Input 20 dB Attenuator — toggles the on-board input pad; uncheck to insert 20 dB of protection when measuring strong signals. 
     47  * Reset LMX button — re-initializes the LO synthesizer(s) to recover from configuration changes.
     48  [[Image(pi-control.png, 600px)]]
    4349
    4450
    4551=== Tutorials
    4652
    47  * [wiki:./Wireless/FR3/Sine Basic Narrowband Sinewave (UHD-based) Link]
     53 * [wiki:./Wireless/FR3/Sine Basic Narrowband (UHD-based) Transmiter and Monitor]
    4854 * [wiki:./Wireless/FR3/Analog Analog FM Link with GNURadio]
    4955 * [wiki:./Wireless/FR3/OFDM Basic OFDM Link with GNURadio]