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 or by an external power supply
- Devices 2-8 can also receive an isolated GNSS antenna signal
- Port-Port isolation - unused Ports may be left unterminated
- ~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.
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.
For better quick
viewing of the design, download the Source file from
the Material List below , unzip it and drop the .sch or .pcb
file onto kicanvas from a web
browser.
.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 |
|
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Item Description |
Provider |
Source Code |
Notes |
Approximate Material Cost(excludes setup fees and shipping) |
Assembled GNSS PCB |
Download GNSS PCB Kit Files |
Download GNSS PCB Source Files |
US$30 | |
Enclosure |
eBay |
US$6 |
||
Enclosure Front Panel |
Download GNSS PCB Front Panel Kit Files |
Download GNSS PCB Front Panel Source Files |
US$1 | |
Enclosure Rear Panel |
Download GNSS PCB Rear Panel Kit Files |
Download GNSS PCB Rear Panel Source Files |
US$1 | |
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