One thought on “QHR Kits: A QRP kit maker in Spain”

  1. Javier has now the DB4020 an SSb transceiver for both 40 and 20mtrs. The kit does have the possibility to add a small board to be able to do CW in a later stage. Also a CW filter is an option in a later stage.

    Some details :

    Frequency coverage: 7.0 – 7.2 MHz on 40m ; 14.0 – 14.35 MHz on 20m.
    Note: You can tune a few hundred kHz below and above the bands, but downgrading the characteristics (SW broadcasting can be heard).
    Tuning steps on two ranges: 10Hz-100Hz-1kHz and 10kHz-100kHz-1MHz.
    Modes: LSB on 40m, USB on 20m (CW optional).
    RIT function: without frequency limit
    Power requirements: 12 – 14VDC 1-2A transmit, 0.2 – 0.4A receive.
    Antenna impedance: 50 ohms.
    Controls: Tuning-pushbutton. Volume. RF attenuator.
    Board dimensions: 180 x 140 mm.
    Weight: (no enclosure): 0.3 kg.

    TRANSMITTER:
    Emissión: LSB/USB (CW optional).
    RF output: 8 W on 40m, 4W on 20m (13.8V).
    2nd harmonic output: -45dB below the fundamental frequency.
    Other spurious signals: -50dB or better below the fundamental frequency.
    Carrier suppression: better than -40dB.
    T/R switching: Relays.
    Microphone type: Electret condenser (capsule included).

    RECEIVER:
    Type: Superheterodyne. Balanced mixers.
    Sensitivity: 0.2uV minimum discernible signal.
    Selectivity: 4-pole crystal ladder filter, 2.4KHz nominal bandwidth (optional narrow CW Filter).
    IF frequency: 4.915MHz.
    AGC: on the receive path according to the received audio.
    Audio output: 250mW, 4-8 ohms.

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