If 

8-way Amplified/Isolating GPS Distribution


Measured S21 (30 dB offset, gain is higher by 30 dB)

Features

  • Supports up to 8 GNSS devices from a single L1 GNSS Antenna
  • Provides more than 60 dB differential and common mode  isolation for LF -HF devices. This is particularly important for a bank of KiwiSDRs.
  • GNSS  Antenna (puck) can be powered by GNSS device #1
  • Devices 2-8 can also receive an isolated GNSS antenna signal
  • ~8-12 dB of low noise, filtered gain to each of the additional outputs
  • Low noise preamplifier provides similar performance to each device
  • Bandpass filter reduces susceptibility to non-GNSS signals
  • Four-layer, through-hole plated, silk-screen printed PCBs

    • Operation

    The first versions of this isolating distribution board I sent out required power for the on board amplifier to be passed in from a functioning GPS receiver/device on input #1. This path does not have isolation because of the need for DC current to pass. In the present version of the board I have added an on-board LDO and made it possible to cut a couple of traces so that an external 5-20V power source may be used instead.

    There is also a resistor that can allow the external supply to be 8V or more for some Antennas which require it. This is a rare situation.

    if it is present, REMOVE THIS RESISTOR BEFORE USING EXTERNAL POWER IF YOU DO NOT WANT THIS HIGHER VOLTAGE OPTION !!!(v1.1 only)

    I test all outputs before sending so hopefully everything will continue just fine.

    If there are any questions, please ask and I will try to post any answers that might be relevant to others on this site.

    It's not particularly complicated or interesting but here's a schematic and a PDF.
    .
    There are three cases for operation:
    Puck antenna receives power from GNSS DUT #1 R3 not present , Nothing need by done
    Puck antenna receives External power 5-16V at W1 R3not present , cut jumper A
    (uncommon) External power 8V, special antenna Add R8, cut both Jumpers A&B

    Much of this cost is due to small quantity.
    Possibly half of this in larger volumes

    APPROXIMATE !

    PCB,Components, enclosure, assembly in China $22
    end panels, hardware etc
    my out of pocket cost ,
    qty. =15    		 $30
    Assembly & Test & Packaging & shipping >1 hour
    Shipping to US $6
    Shipping to Europe $20

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