• Be careful when plugging in cables. Avoid applying sideways pressure that might damage jacks.
  • Avoid operating in wet conditions. It depends on your enclosure but unlike you have waterproofed it, water will damage your mcHF.
  • Avoid operating at very high temperatures. And ensure you have heat-sinked your "final FETs" and the voltage regulators to avoid damaging it.
  • The mcHF can be damaged by electrostatic discharge (ESD). The only port with ESD protection is the BNC antenna connector so be careful when connecting paddles, line in/out, USB connectors and discharge it (touching with an unpainted metal surface) when possible before connecting it to your mcHF, to avoid possibles ESD damages to internal electronic.
  • Always have a known-good 50Ω load connected before transmitting. To avoid damaging your final FETs.

The mcHF connection panels

  • Right Panel:

    • Line Out/In: Used for Audio Input/Output for external devices like PC. Not affected by AF setting.
    • Microphone/PTT: Used for microphone audio input, and Push-To-Talk switching.
    • Speaker/Phones: Used for Headphones or external speaker, Gain is controlled with AF. Auto-disconnects internal speaker when has a connector inserted.

      Be careful when wearing headphones. Max. Vol. Setting has to be properly adjusted to avoid damage in your ears!

    • Power Connector: Used for providing 11-16v DC to the rig, internally has a 3A SMD fuse to protect the mcHF from overcurrent consumption.

    • Paddle/Key: Used for connecting suitable telegraphy straight key, or paddles. Choose by menu entry.

    • Accessory: Used for triggering PTT in external lineal amps, or other devices.

Fig. 1 - Right Panel
  • Left Panel:
    • USB-A: "USB-A" type. At the moment it is only used for loading Firmware to the mcHF.
    • miniUSB: "Mini-B" type. Used mainly for CAT communications.
    • Antenna Connector: This is the RF output. Use 50Ω antenna network or known-good dummy load.

Fig. 2 - Left Panel

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