[HamBrewers] HERMES Technical parameters

 

Video:   http://www.youtube.com/watch?v=NyYRs8dzapY     HERMES: Technical details   Transmit and receiver image rejection > 110dB Full duplex operation, any split over entire 160m to 6m range Future expansion possible to eight independent receivers using the same antenna 500mW RF output on 160 – 6m amateur bands Built-in high performance preamp, with a noise floor typically -135dBm in 500Hz Software-selectable 31dB input attenuator in 1dB steps High performance receiver – same specifications as the HPSDR Mercury receiver (ie Blocking Dynamic Range typically about 125dB) FPGA code can be updated via the Industry Standard TCP/IP network Ethernet connection Seven user-configurable open-collector outputs, independently selectable per band and Tx/Rx (for relay control, etc - with sequencing via PC code) Separate open-collector PTT connection for amplifier control, etc, with sequencer Microphone PTT jumper-selectable from tip or ring connection Bias for electret microphones via jumper Four user-configurable 12 bit analogue inputs (for ALC, SWR etc) Three user-configurable digital inputs (for linear amplifier over temperature, etc) Optional in-built switch mode power supply – less than xxxmA (receive) from a 13.8V supply I2C bus connector for control of external equipment Full QSK using the Kiss Konsole software, since digital signal processing is not used in the controlling PC for CW carrier generation Low-level transmitter output for transverter use (0dBm) as well as user-selectable output attenuator Stereo audio outputs at line and headphone levels In-built 1W stereo audio amplifier for directly driving speakers Direct, de-bounced connections for a Morse key (straight or iambic) and PTT 122.88MHz master clock, which can be phase-locked to an internal 10MHz TCXO or external frequency reference Jumper-selectable external frequency reference, with signal processing, to suit numerous GPS-locked 10MHz reference sources Direct ribbon cable interface to Apollo 15W power amplifier, low pass filters and automatic ATU. Low noise, high efficiency, Switching Power Supply designed by Kjell Karson,LA2NI

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