[time-nuts] Re: New GNSS Antenna Splitter Available

[Jeremy Elson]

This looks like a great piece of hardware!

A few months ago I ended up buying this:
https://www.instockwireless.com/gps-signal-splitter-SMA-gps310.htm

It's similar in that it's a multiband splitter, but has a passband filter
that allows through L1-L5. It is about $50 more expensive, and does not
have an integrated LNA.


On Tue, Jun 27, 2023 at 11:04 AM John Ackermann N8UR via time-nuts <
time-nuts at lists.febo.com> wrote:

> Dual-frequency GNSS receivers are becoming more common, and you can now
> buy low cost L1/L2/L5 antennas.  But it's hard to find a GNSS antenna
> splitter that handles multiple bands; most of them have SAW filters for
> L1 only.  I ran into that problem and designed a solution: the GUS, or
> "GNSS Unfiltered Splitter", which is what it says it is.  TAPR is now
> offering it for sale.
>
> The GUS has four output ports with SMA connectors and covers L1, L2, and
> L5 (in fact, it's usable from 1 to about 1.7 GHz).  Its LNA makes up for
> splitter losses and provides a net gain of about 7 dB.  The outputs have
> equal time delays within a handful of picoseconds, but are not phase
> matched.
>
> It does not have any bandpass filtering, so might not be suitable for
> use near high power transmitting sites.  But in most applications,
> filtering beyond that provided by the antenna isn't necessary.
>
> The GUS can be powered from a receiver, and voltage is passed through to
> power an antenna LNA.  In addition, it can use external power and can
> handle inputs from 3.3 to 15 volts.  An on-board regulator is available
> if the antenna requires lower voltage than the power source, and antenna
> power can be disabled.  In short, the GUS tries to support just about
> every receiver/power/antenna combination that's out there.
>
> The GUS is available from TAPR now:
> https://tapr.org/product/gus-gnss-antenna-splitter/
> It's fully assembled except for the RF connectors (which are included),
> and a matching extruded aluminum case with endplates is available.
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