N6MUDChecking live
Station onlineSan Diego, CA
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Amateur radio station / N6MUD

Amateur Radio
redefined.

Amateur Radio • ESSB • SDR

Exploring wideband HF audio, software-defined radio, antennas, and portable operation from San Diego, California.

Electro-Voice RE320 microphone with custom N6MUD mic flag
AUDIO / ESSBElectro-Voice RE320

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    Updated --

    Station energy / Battery

    EcoFlow Power Station

    Connecting to DELTA Pro 3
    EcoFlowDELTA PRO 3
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    EcoFlow DELTA Pro 3 portable power station
    DELTA Pro 3 / 4,096 Wh LFP
    TIME REMAINING--
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    OPERATING RANGE--
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    ↗TOTAL USE--

    Charging sources

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    12 / 24 volt DC
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    120V240V12V DCUSB-CUSB-AX-BOOSTAC ALWAYS ON

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    120V output
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    240V output
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    TT-30 output
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    Connected equipment

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    Explore / Core topics

    Inside N6MUD

    01
    Extended Single Sideband

    ESSB

    The audio chain, transmit processing, and 6 kHz wideband voice behind the N6MUD audio.

    RE320 / SSL2 / DEQ2496↗
    02
    The Radio Room

    Station

    SDR hardware, RF power, metering, and the 40-meter horizontal loop that brings it together.

    G2 / RF2K-S / LP-100↗
    03
    Notes From The Bench

    Articles

    Technical observations, equipment notes, and practical experiments from the station and field.

    04
    Livestream knowledge

    Transcript search

    Voice-to-text helps turn each livestream into a searchable transcript with timestamps, chapter markers, episode summaries, and podcast notes—reviewed before publishing.

    Article / N6MUD

    Article / ESSB audio processing

    ESSB & Behringer 2496

    Source & technical researchJohn M. Anning · NU9N
    Article link ↗
    Behringer DEQ2496 front-panel controls from the NU9N setup guide
    Behringer DEQ2496 mastering processor

    The DEQ2496 combines equalization, dynamic control, downward expansion, limiting, and analysis in one processor—making it a flexible tool for shaping extended-SSB transmit audio.

    This condensed field guide follows the initial-setup principles documented by NU9N. Treat the values as a starting point: microphone response, voice, transceiver bandwidth, gain staging, and other processors all affect the final result.

    Read NU9N’s complete setup guide ↗
    Operating modeDual Mono

    Independent processing for transmit and receive audio.

    Maximum level+22 dBu

    Rear-panel MAX switch in for additional peak headroom.

    Input sourceMain In

    Use the primary analog input path.

    Sample rate96.0 kHz

    Set from I/O menu page one.

    01 / Establish the platform

    Utility, bypass, and I/O

    Check the installed firmware before changing settings. NU9N identifies version 1.4 for original hardware and 2.5 for later version-two units. Set Channel Mode to Dual Mono, bypass unused modules, and establish the main input and clock configuration before EQ work begins.

    DEQ2496 Utility menu page one settings from NU9NDEQ2496 bypass menu configuration from NU9N
    02 / Set gain structure

    Feed it clean audio

    With the meter reading the input source, adjust the microphone preamp so normal speech is around −25 dB on the input peak meter; brief voice peaks approaching −10 dB are expected. Good gain staging preserves headroom before dynamic or equalization processing.

    DEQ2496 input and output menu settings from NU9N
    03 / Shape dynamics

    Dynamic EQ is not static EQ

    NU9N uses the three DEQ bands as amplitude-dependent control across broad frequency regions—functionally similar to multiband compression. Thresholds must be calibrated with the actual voice and level. Any upstream gain, EQ, or compression change requires those thresholds to be recalibrated.

    DEQ2496 dynamic EQ frequency and bandwidth distribution from NU9N
    04 / Tailor the passband

    Build PEQ around the station

    Parametric EQ settings depend on the microphone, voice, transmitter response, and occupied bandwidth. NU9N’s 6 kHz example is informative, not universal. Begin with other tone controls and compression neutral, avoid very narrow low-bass filters, then evaluate and adjust the complete transmitted audio chain.

    Example DEQ2496 parametric EQ settings for a 6 kHz ESSB bandwidth from NU9N

    Technical concepts and illustrations credited to John M. Anning, NU9N. This N6MUD article is an original condensed summary and does not replace the full source instructions.

    Original NU9N article ↗

    Latest stream / Audio report

    ESSB recording by KJ7E

    Hear the complete N6MUD wideband audio chain: Apache Labs G2, RE320, Behringer DEQ2496, Thetis, SSL2, LP-100, and RF2K-S.

    MODE ESSBBANDWIDTH 6 kHzPLATFORM YouTube
    Watch recording ↗

    Mobile shack / Walkthrough

    1999 Toyota Land Cruiser

    Tour the N6MUD Mobile Shack on Wheels and its amateur radio installation.

    Open on YouTube ↗

    On the air / Replay archive

    Recent livestreams

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      N6MUD / Station archive

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