[time-nuts] Re: GPS Splitter for L1, GNSS, etc?

[paul swed]

Thats why the satellite splitters are nice they have the blocking
capacitors built in with diodes to forward the highest voltage to the
antenna. But lots of great ways to solve the problem.
Paul

On Wed, Jun 2, 2021 at 11:23 AM Michael Klimenko 
wrote:

> Hello Scott,
>
> Currently, I'm using the Mini-Circuits ZESC-2-11+ power splitter for the
> GNSS receiver development, they're around $80 brand new, probably you may
> find them used for less. Bear in mind that they pass DC, which is good for
> powering the antenna, but may have some unexpected behaviour when two
> receivers will try to power each other, so grab an inline DC blocker as
> well.
>
> Sincerely,
> Michael
>
> On Wed, 2 Jun 2021 at 07:22, W7SLS  wrote:
>
> > Hello,
> >
> > Looking for group wisdom to avoid newbie mistakes with a GPS splitter.
> >
> > For context, I’m a home- not National- or University-Lab.
> > That said, I have a non-zero budget.
> >
> > Today:
> > Antenna
> > 1- CORS RTK GNSS Survey Antenna high gain measurement GNSS GPS
> > GLONASS BDS 
> > 2 - patch antenna - works really well with Time Hat, even a few
> > meters way from window
> >
> > Splitter
> > 1 - Symmetricom 58536A
> >
> > Devices
> > 1 - Auction Site GPSDO
> > 2 - Leo Bodnar GPSDO
> > 3 - Time Hat <— wow!  a fan!
> > 4 - (on the way) 2nd Time Hat
> >
> > Site
> > - suburban, forest to the S, hill to the N
> >
> > Challenge:
> >
> > Existing  splitter is L1 only (I think), which blocks the many
> > newer GPS satellites.
> > With my compromised (for GPS) location, that’s not so good.
> >
> > I need / want a wider band GPS Splitter
> >
> > 1 - some posts talk about removing the bandpass filters in an
> > existing splitter
> > OK, but (a) it nukes any value of that splitter, and (b)
> > those filters also eliminate other interference (yes?)
> >
> > 2 - new choices seem to be in the $1000 and way above, outside of
> > my budget
> >
> > 3 - more interested in ‘ready to use’ than ‘have to add on
> > bypasses' to power the antenna (e.g., Cable TV splitter)
> >
> > 3 - auction site has numerous options, but I’m not sure how to
> > 'separate wheat from chaff’
> >
> > LOL, some of you may be the sellers :)
> >
> > several items $500+  <— more than I want to spend
> > several items $30 -   <— I’d rather not get  aTV antenna
> > splitter and a hobby to make it work
> >
> > 324575653743  GPS Source S14 $175
> >
> > 153359161105  GPS Antenna Splitter GPS/GLONASS L1 GALILEO
> > E1 BEIDOU B1- FedEx Fast Ship SV1AFN $120
> >
> >
> > Thoughts?   Thanks for the group bandwidth.
> >
> > Scott W7SLS
> >
> > PS:  yes the Symmetricom 58536A will be for sale after I replace it.
> > ___
> > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe
> send
> > an email to time-nuts-le...@lists.febo.com
> > To unsubscribe, go to and follow the instructions there.
> ___
> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send
> an email to time-nuts-le...@lists.febo.com
> To unsubscribe, go to and follow the instructions there.
___
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email to time-nuts-le...@lists.febo.com
To unsubscribe, go to and follow the instructions there.

[time-nuts] Re: GPS Splitter for L1, GNSS, etc?

[Michael Klimenko]

Hello Scott,

Currently, I'm using the Mini-Circuits ZESC-2-11+ power splitter for the
GNSS receiver development, they're around $80 brand new, probably you may
find them used for less. Bear in mind that they pass DC, which is good for
powering the antenna, but may have some unexpected behaviour when two
receivers will try to power each other, so grab an inline DC blocker as
well.

Sincerely,
Michael

On Wed, 2 Jun 2021 at 07:22, W7SLS  wrote:

> Hello,
>
> Looking for group wisdom to avoid newbie mistakes with a GPS splitter.
>
> For context, I’m a home- not National- or University-Lab.
> That said, I have a non-zero budget.
>
> Today:
> Antenna
> 1- CORS RTK GNSS Survey Antenna high gain measurement GNSS GPS
> GLONASS BDS 
> 2 - patch antenna - works really well with Time Hat, even a few
> meters way from window
>
> Splitter
> 1 - Symmetricom 58536A
>
> Devices
> 1 - Auction Site GPSDO
> 2 - Leo Bodnar GPSDO
> 3 - Time Hat <— wow!  a fan!
> 4 - (on the way) 2nd Time Hat
>
> Site
> - suburban, forest to the S, hill to the N
>
> Challenge:
>
> Existing  splitter is L1 only (I think), which blocks the many
> newer GPS satellites.
> With my compromised (for GPS) location, that’s not so good.
>
> I need / want a wider band GPS Splitter
>
> 1 - some posts talk about removing the bandpass filters in an
> existing splitter
> OK, but (a) it nukes any value of that splitter, and (b)
> those filters also eliminate other interference (yes?)
>
> 2 - new choices seem to be in the $1000 and way above, outside of
> my budget
>
> 3 - more interested in ‘ready to use’ than ‘have to add on
> bypasses' to power the antenna (e.g., Cable TV splitter)
>
> 3 - auction site has numerous options, but I’m not sure how to
> 'separate wheat from chaff’
>
> LOL, some of you may be the sellers :)
>
> several items $500+  <— more than I want to spend
> several items $30 -   <— I’d rather not get  aTV antenna
> splitter and a hobby to make it work
>
> 324575653743  GPS Source S14 $175
>
> 153359161105  GPS Antenna Splitter GPS/GLONASS L1 GALILEO
> E1 BEIDOU B1- FedEx Fast Ship SV1AFN $120
>
>
> Thoughts?   Thanks for the group bandwidth.
>
> Scott W7SLS
>
> PS:  yes the Symmetricom 58536A will be for sale after I replace it.
> ___
> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send
> an email to time-nuts-le...@lists.febo.com
> To unsubscribe, go to and follow the instructions there.
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[time-nuts] Re: GPS Splitter for L1, GNSS, etc?

[Bob kb8tq]

Hi

Filtering is a good thing. Narrow filtering for GPS/L1 is the only way to get 
a GPSDO running on a cell site. There simply is way to much RF running around.

Once you head down the “triple band / all GNSS” road, the filtering needs to
cover a *lot* of spectrum. Most setups simply drop the filtering from the 
equation. 
That’s true of home labs and fancier installations. 

My preferred approach is to use eBay / Minicircuits splitters with SMA 
connectors
on them. They are dirt cheap and pretty much indestructible.  A high gain survey
antenna already has enough signal out to drive a rational length of LMR 400 and 
a fairly large splitter. 

More or less:

Survey antenna has 50 db gain (eBay link does not work so I’m guessing here) 
Most modules / devices are happy with 20 to 30 db gain. They may only degrade a 
bit at 15 db. 
… You have 20 to 30 db to work with
8 port splitter is ~9 db
16 port splitter is ~12 db
100 feet of LMR 400 at 1.5 GHz is 5.9 db according to:

https://www.timesmicrowave.com/calculator?Product=LMR-400=100=1500
 


Worst case would be 20 db gain, 12 db splitter, 6 db coax. You still have 2 db 
to spare.  Less coax
or smaller splitter would give you a bit more margin. 

Bob


> On Jun 2, 2021, at 12:20 AM, W7SLS  wrote:
> 
> Hello,
> 
> Looking for group wisdom to avoid newbie mistakes with a GPS splitter.
> 
> For context, I’m a home- not National- or University-Lab.
> That said, I have a non-zero budget.
> 
> Today:
>   Antenna 
>   1- CORS RTK GNSS Survey Antenna high gain measurement GNSS GPS GLONASS 
> BDS 
>   2 - patch antenna - works really well with Time Hat, even a few meters 
> way from window
>   
>   Splitter
>   1 - Symmetricom 58536A
> 
>   Devices
>   1 - Auction Site GPSDO
>   2 - Leo Bodnar GPSDO
>   3 - Time Hat <— wow!  a fan!
>   4 - (on the way) 2nd Time Hat
> 
>   Site
>   - suburban, forest to the S, hill to the N
> 
> Challenge:
> 
>   Existing  splitter is L1 only (I think), which blocks the many newer 
> GPS satellites.
>   With my compromised (for GPS) location, that’s not so good.
> 
> I need / want a wider band GPS Splitter
> 
>   1 - some posts talk about removing the bandpass filters in an existing 
> splitter
>   OK, but (a) it nukes any value of that splitter, and (b) those 
> filters also eliminate other interference (yes?)
> 
>   2 - new choices seem to be in the $1000 and way above, outside of my 
> budget
> 
>   3 - more interested in ‘ready to use’ than ‘have to add on bypasses' to 
> power the antenna (e.g., Cable TV splitter)
> 
>   3 - auction site has numerous options, but I’m not sure how to 
> 'separate wheat from chaff’
> 
>   LOL, some of you may be the sellers :)
> 
>   several items $500+  <— more than I want to spend
>   several items $30 -   <— I’d rather not get  aTV antenna 
> splitter and a hobby to make it work
>   
>   324575653743  GPS Source S14 $175
> 
>   153359161105  GPS Antenna Splitter GPS/GLONASS L1 GALILEO E1 
> BEIDOU B1- FedEx Fast Ship SV1AFN $120
> 
> 
> Thoughts?   Thanks for the group bandwidth.
> 
> Scott W7SLS
> 
> PS:  yes the Symmetricom 58536A will be for sale after I replace it.
> ___
> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an 
> email to time-nuts-le...@lists.febo.com
> To unsubscribe, go to and follow the instructions there.

___
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[time-nuts] Re: GPS Splitter for L1, GNSS, etc?

[paul swed]

Hello to the group. Oh the splitter conversation.  Arne do a search on the
time-nuts archive there are a ton of responses to similar questions.
Though you do add the wider bandwidth of GNSS.
I have used the following for many years. Antenna, 100 ft 1/2" hardline, DC
inserter, Amplifier mini circuit to make up for splitter loss(Gain 16 db I
think). 1:8 Satellite TV splitter. Boy its amazing how 8 outputs can get
consumed. The splitter blocks all of the various GPS DC antenna feeds. You
could insert various bandpass filters ahead of the amplifier.
Good luck.
Paul
WB8TSL

On Wed, Jun 2, 2021 at 5:26 AM Andy Talbot  wrote:

> I once saw a design for a GPS antenna splitter that comprised a four-way
> Wilkinson splitter on PCB microstrip, so had DC continuity between all
> ports   At each output port was a capacitor to pass the RF, shunted by a
> small diode.   That way any GPS receiver that put DC on its antenna port
> would be isolated by the diodes  from all the other receivers.  The
> receiver delivering the highest antenna supply voltage would  'win' and end
> up supplying the active antenna via its diode in the splitter.
>
> Andy
> www.g4jnt.com
>
>
>
> On Wed, 2 Jun 2021 at 10:14, shouldbe q931  wrote:
>
> > On Wed, Jun 2, 2021 at 10:09 AM shouldbe q931 
> > wrote:
> > >
> > > On Wed, Jun 2, 2021 at 5:21 AM W7SLS  wrote:
> > > >
> > > > Hello,
> > > >
> > > > Looking for group wisdom to avoid newbie mistakes with a GPS
> splitter.
> > > >
> > > > For context, I’m a home- not National- or University-Lab.
> > > > That said, I have a non-zero budget.
> > > >
> > > > Today:
> > > > Antenna
> > > > 1- CORS RTK GNSS Survey Antenna high gain measurement GNSS
> GPS
> > GLONASS BDS 
> > > > 2 - patch antenna - works really well with Time Hat, even a
> > few meters way from window
> > > >
> > > > Splitter
> > > > 1 - Symmetricom 58536A
> > > >
> > > > Devices
> > > > 1 - Auction Site GPSDO
> > > > 2 - Leo Bodnar GPSDO
> > > > 3 - Time Hat <— wow!  a fan!
> > > > 4 - (on the way) 2nd Time Hat
> > > >
> > > > Site
> > > > - suburban, forest to the S, hill to the N
> > > >
> > > > Challenge:
> > > >
> > > > Existing  splitter is L1 only (I think), which blocks the
> many
> > newer GPS satellites.
> > > > With my compromised (for GPS) location, that’s not so good.
> > > >
> > > > I need / want a wider band GPS Splitter
> > > >
> > > > 1 - some posts talk about removing the bandpass filters in an
> > existing splitter
> > > > OK, but (a) it nukes any value of that splitter, and
> > (b) those filters also eliminate other interference (yes?)
> > > >
> > > > 2 - new choices seem to be in the $1000 and way above,
> outside
> > of my budget
> > > >
> > > > 3 - more interested in ‘ready to use’ than ‘have to add on
> > bypasses' to power the antenna (e.g., Cable TV splitter)
> > > >
> > > > 3 - auction site has numerous options, but I’m not sure how
> to
> > 'separate wheat from chaff’
> > > >
> > > > LOL, some of you may be the sellers :)
> > > >
> > > > several items $500+  <— more than I want to spend
> > > > several items $30 -   <— I’d rather not get  aTV
> > antenna splitter and a hobby to make it work
> > > >
> > > > 324575653743  GPS Source S14 $175
> > > >
> > > > 153359161105  GPS Antenna Splitter GPS/GLONASS L1
> > GALILEO E1 BEIDOU B1- FedEx Fast Ship SV1AFN $120
> > > >
> > > >
> > > > Thoughts?   Thanks for the group bandwidth.
> > > >
> > > > Scott W7SLS
> > > >
> > > > PS:  yes the Symmetricom 58536A will be for sale after I replace it.
> > > > ___
> > > > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe
> > send an email to time-nuts-le...@lists.febo.com
> > > > To unsubscribe, go to and follow the instructions there.
> > >
> >
> > And now for the complete email...
> >
> > One might consider something like 40252864 combined with Bias Tee
> > DC blocks such as 124130508678 for all bar one of the receivers, which
> > is used to power the antenna.
> >
> > Not a one box solution, but very simple to put together with some SMA
> > to SMA cables.
> >
> > Cheers
> >
> > Arne
> > ___
> > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe
> send
> > an email to time-nuts-le...@lists.febo.com
> > To unsubscribe, go to and follow the instructions there.
> ___
> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send
> an email to time-nuts-le...@lists.febo.com
> To unsubscribe, go to and follow the instructions there.
___
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an 
email to 

[time-nuts] Re: GPS Splitter for L1, GNSS, etc?

[Andy Talbot]

I once saw a design for a GPS antenna splitter that comprised a four-way
Wilkinson splitter on PCB microstrip, so had DC continuity between all
ports   At each output port was a capacitor to pass the RF, shunted by a
small diode.   That way any GPS receiver that put DC on its antenna port
would be isolated by the diodes  from all the other receivers.  The
receiver delivering the highest antenna supply voltage would  'win' and end
up supplying the active antenna via its diode in the splitter.

Andy
www.g4jnt.com



On Wed, 2 Jun 2021 at 10:14, shouldbe q931  wrote:

> On Wed, Jun 2, 2021 at 10:09 AM shouldbe q931 
> wrote:
> >
> > On Wed, Jun 2, 2021 at 5:21 AM W7SLS  wrote:
> > >
> > > Hello,
> > >
> > > Looking for group wisdom to avoid newbie mistakes with a GPS splitter.
> > >
> > > For context, I’m a home- not National- or University-Lab.
> > > That said, I have a non-zero budget.
> > >
> > > Today:
> > > Antenna
> > > 1- CORS RTK GNSS Survey Antenna high gain measurement GNSS GPS
> GLONASS BDS 
> > > 2 - patch antenna - works really well with Time Hat, even a
> few meters way from window
> > >
> > > Splitter
> > > 1 - Symmetricom 58536A
> > >
> > > Devices
> > > 1 - Auction Site GPSDO
> > > 2 - Leo Bodnar GPSDO
> > > 3 - Time Hat <— wow!  a fan!
> > > 4 - (on the way) 2nd Time Hat
> > >
> > > Site
> > > - suburban, forest to the S, hill to the N
> > >
> > > Challenge:
> > >
> > > Existing  splitter is L1 only (I think), which blocks the many
> newer GPS satellites.
> > > With my compromised (for GPS) location, that’s not so good.
> > >
> > > I need / want a wider band GPS Splitter
> > >
> > > 1 - some posts talk about removing the bandpass filters in an
> existing splitter
> > > OK, but (a) it nukes any value of that splitter, and
> (b) those filters also eliminate other interference (yes?)
> > >
> > > 2 - new choices seem to be in the $1000 and way above, outside
> of my budget
> > >
> > > 3 - more interested in ‘ready to use’ than ‘have to add on
> bypasses' to power the antenna (e.g., Cable TV splitter)
> > >
> > > 3 - auction site has numerous options, but I’m not sure how to
> 'separate wheat from chaff’
> > >
> > > LOL, some of you may be the sellers :)
> > >
> > > several items $500+  <— more than I want to spend
> > > several items $30 -   <— I’d rather not get  aTV
> antenna splitter and a hobby to make it work
> > >
> > > 324575653743  GPS Source S14 $175
> > >
> > > 153359161105  GPS Antenna Splitter GPS/GLONASS L1
> GALILEO E1 BEIDOU B1- FedEx Fast Ship SV1AFN $120
> > >
> > >
> > > Thoughts?   Thanks for the group bandwidth.
> > >
> > > Scott W7SLS
> > >
> > > PS:  yes the Symmetricom 58536A will be for sale after I replace it.
> > > ___
> > > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe
> send an email to time-nuts-le...@lists.febo.com
> > > To unsubscribe, go to and follow the instructions there.
> >
>
> And now for the complete email...
>
> One might consider something like 40252864 combined with Bias Tee
> DC blocks such as 124130508678 for all bar one of the receivers, which
> is used to power the antenna.
>
> Not a one box solution, but very simple to put together with some SMA
> to SMA cables.
>
> Cheers
>
> Arne
> ___
> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send
> an email to time-nuts-le...@lists.febo.com
> To unsubscribe, go to and follow the instructions there.
___
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an 
email to time-nuts-le...@lists.febo.com
To unsubscribe, go to and follow the instructions there.

[time-nuts] Re: GPS Splitter for L1, GNSS, etc?

[shouldbe q931]

On Wed, Jun 2, 2021 at 10:09 AM shouldbe q931  wrote:
>
> On Wed, Jun 2, 2021 at 5:21 AM W7SLS  wrote:
> >
> > Hello,
> >
> > Looking for group wisdom to avoid newbie mistakes with a GPS splitter.
> >
> > For context, I’m a home- not National- or University-Lab.
> > That said, I have a non-zero budget.
> >
> > Today:
> > Antenna
> > 1- CORS RTK GNSS Survey Antenna high gain measurement GNSS GPS 
> > GLONASS BDS 
> > 2 - patch antenna - works really well with Time Hat, even a few 
> > meters way from window
> >
> > Splitter
> > 1 - Symmetricom 58536A
> >
> > Devices
> > 1 - Auction Site GPSDO
> > 2 - Leo Bodnar GPSDO
> > 3 - Time Hat <— wow!  a fan!
> > 4 - (on the way) 2nd Time Hat
> >
> > Site
> > - suburban, forest to the S, hill to the N
> >
> > Challenge:
> >
> > Existing  splitter is L1 only (I think), which blocks the many 
> > newer GPS satellites.
> > With my compromised (for GPS) location, that’s not so good.
> >
> > I need / want a wider band GPS Splitter
> >
> > 1 - some posts talk about removing the bandpass filters in an 
> > existing splitter
> > OK, but (a) it nukes any value of that splitter, and (b) 
> > those filters also eliminate other interference (yes?)
> >
> > 2 - new choices seem to be in the $1000 and way above, outside of 
> > my budget
> >
> > 3 - more interested in ‘ready to use’ than ‘have to add on 
> > bypasses' to power the antenna (e.g., Cable TV splitter)
> >
> > 3 - auction site has numerous options, but I’m not sure how to 
> > 'separate wheat from chaff’
> >
> > LOL, some of you may be the sellers :)
> >
> > several items $500+  <— more than I want to spend
> > several items $30 -   <— I’d rather not get  aTV antenna 
> > splitter and a hobby to make it work
> >
> > 324575653743  GPS Source S14 $175
> >
> > 153359161105  GPS Antenna Splitter GPS/GLONASS L1 GALILEO 
> > E1 BEIDOU B1- FedEx Fast Ship SV1AFN $120
> >
> >
> > Thoughts?   Thanks for the group bandwidth.
> >
> > Scott W7SLS
> >
> > PS:  yes the Symmetricom 58536A will be for sale after I replace it.
> > ___
> > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send 
> > an email to time-nuts-le...@lists.febo.com
> > To unsubscribe, go to and follow the instructions there.
>

And now for the complete email...

One might consider something like 40252864 combined with Bias Tee
DC blocks such as 124130508678 for all bar one of the receivers, which
is used to power the antenna.

Not a one box solution, but very simple to put together with some SMA
to SMA cables.

Cheers

Arne
___
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an 
email to time-nuts-le...@lists.febo.com
To unsubscribe, go to and follow the instructions there.

[time-nuts] Re: GPS Splitter for L1, GNSS, etc?

[shouldbe q931]

On Wed, Jun 2, 2021 at 5:21 AM W7SLS  wrote:
>
> Hello,
>
> Looking for group wisdom to avoid newbie mistakes with a GPS splitter.
>
> For context, I’m a home- not National- or University-Lab.
> That said, I have a non-zero budget.
>
> Today:
> Antenna
> 1- CORS RTK GNSS Survey Antenna high gain measurement GNSS GPS 
> GLONASS BDS 
> 2 - patch antenna - works really well with Time Hat, even a few 
> meters way from window
>
> Splitter
> 1 - Symmetricom 58536A
>
> Devices
> 1 - Auction Site GPSDO
> 2 - Leo Bodnar GPSDO
> 3 - Time Hat <— wow!  a fan!
> 4 - (on the way) 2nd Time Hat
>
> Site
> - suburban, forest to the S, hill to the N
>
> Challenge:
>
> Existing  splitter is L1 only (I think), which blocks the many newer 
> GPS satellites.
> With my compromised (for GPS) location, that’s not so good.
>
> I need / want a wider band GPS Splitter
>
> 1 - some posts talk about removing the bandpass filters in an 
> existing splitter
> OK, but (a) it nukes any value of that splitter, and (b) 
> those filters also eliminate other interference (yes?)
>
> 2 - new choices seem to be in the $1000 and way above, outside of my 
> budget
>
> 3 - more interested in ‘ready to use’ than ‘have to add on bypasses' 
> to power the antenna (e.g., Cable TV splitter)
>
> 3 - auction site has numerous options, but I’m not sure how to 
> 'separate wheat from chaff’
>
> LOL, some of you may be the sellers :)
>
> several items $500+  <— more than I want to spend
> several items $30 -   <— I’d rather not get  aTV antenna 
> splitter and a hobby to make it work
>
> 324575653743  GPS Source S14 $175
>
> 153359161105  GPS Antenna Splitter GPS/GLONASS L1 GALILEO E1 
> BEIDOU B1- FedEx Fast Ship SV1AFN $120
>
>
> Thoughts?   Thanks for the group bandwidth.
>
> Scott W7SLS
>
> PS:  yes the Symmetricom 58536A will be for sale after I replace it.
> ___
> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an 
> email to time-nuts-le...@lists.febo.com
> To unsubscribe, go to and follow the instructions there.

One might consider something like
https://www.ebay.com/itm/40252864 combined with SMA
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