Hi

Here’s a few:

https://www.ebay.com/itm/MINI-CIRCUITS-ZN2PD2-50-S-500-5000-MHz-DC-PASS-POWER-SPLITTER-COMBINER-SMA-RF/303304610774?_trkparms=ispr%3D1&hash=item469e5d13d6:g:lnkAAOSwadda-dWk&enc=AQAEAAACcIQvEcHUrT7nmUC3yY5qbPyaBN1nJEDYW8MyypsJPgXKJXIsITcN%2FKrpKO55R9QEPxkxT2C13G%2F8Xk%2FPP292RqnkdoqMREuiokDYomKFgDYMyHK5NpBmYMrTGVRBghCM9ucW5EHQatAcaroMUERVocWILBJZr0aAL1rg0BMb2FAEC95paFI6Exo4L0NvOSnUXBhmsTofTuG4acn5hM%2B3rU21j6tKdyUwbBGWWvsvmgYGGqawn%2BZ5hoJBdodFVbrR9vuU%2FTFR3Rs1eNMgxBw3JU3QDd4YPFspcp5Q56lUVqU%2BwjyPY98srkHv4%2FmspPqCZflMtwL4%2Fl2s54WQWL0ilRctyNRd9Eklavo%2FRPLKMqaLl8YufMK6My0G6TKwQE76FVvs2rlM5FAvQki2ZpLtWHDH8jbtZ%2BrznJ00vHBvzeQD76ER991HEZ9eTDrSumgnul%2BGawZ%2BH1By24%2FZwWzGmHd%2BYkr3INeW2T3jAkDArDDNo%2F0xRvldLmRdZog%2FNYQwSP%2BAoDBym0hUbeDbsmBuKFei0be%2FyKlTSlFNfjq68PsZg%2BtiWaw4Qseki9qCJ%2FeWC93VQpx%2BdGe0jdT6RtSn1sVgWA3N68JtgQLW%2Fdu5fiik6Pilz5gvmtS8FUFUtIGPA%2FFjkfY%2FLZEPscsbNKfL3kybfuP7JA9KCJj2icZcq9lfHA3sL8wyzbn9P87JRwbiJBie3GN6hc7wb2exiQR7DOeCcxgab7MaJgRYp7BhMh%2FgInUCR9oJ4jMYbSx%2FP8tkPog1%2BIO9vbFKkx3Rss5D4FK8CFEulk0%2Fjk4b59m3O9nt7XTmXAPLAlsxNS3JIhTRZg%3D%3D&checksum=303304610774b70feddababe48ce92db06723c4bed61

https://www.ebay.com/itm/Mini-Circuits-ZFRSC-42-S-DC-4200-MHz-2-Way-0-Coaxial-Power-Splitter/362978034441?hash=item54832d4309:g:5LEAAOSwpXBeogtk https://www.ebay.com/itm/Mini-Circuits-ZFRSC-42-S-DC-4200-MHz-2-Way-0-Coaxial-Power-Splitter/362978034441?hash=item54832d4309:g:5LEAAOSwpXBeogtk

https://www.ebay.com/itm/Mini-Circuits-ZFSC-2-2500-S-Splitter-10-2500MHz/333575123789?hash=item4daaa0734d:g:YhUAAOSwvXRelgES https://www.ebay.com/itm/Mini-Circuits-ZFSC-2-2500-S-Splitter-10-2500MHz/333575123789?hash=item4daaa0734d:g:YhUAAOSwvXRelgES

https://www.ebay.com/itm/Mini-Circuits-ZAPD-21-RF-Signal-Splitter-SMA-Connectors-2-WAY-50-500-2000MHz/392380225626?epid=1901750628&hash=item5b5baf185a:g:LqgAAOSwvf1dUdvN https://www.ebay.com/itm/Mini-Circuits-ZAPD-21-RF-Signal-Splitter-SMA-Connectors-2-WAY-50-500-2000MHz/392380225626?epid=1901750628&hash=item5b5baf185a:g:LqgAAOSwvf1dUdvN

https://www.ebay.com/itm/Mini-Circuits-ZN4PD1-63W-S-RF-Power-Splitter-250-6000MHz-Qty-Available-GOOD/133387795141?hash=item1f0e883ac5:g:tdoAAOSwAbxel2o~ https://www.ebay.com/itm/Mini-Circuits-ZN4PD1-63W-S-RF-Power-Splitter-250-6000MHz-Qty-Available-GOOD/133387795141?hash=item1f0e883ac5:g:tdoAAOSwAbxel2o~

https://www.ebay.com/itm/NEW-Mini-Circuits-ZAPD-21-S-DC-Pass-Power-Splitter-Combiner-500-2000MHz/164076236933?hash=item2633b4b085:g:uaIAAOSwR-9eQaf1 https://www.ebay.com/itm/NEW-Mini-Circuits-ZAPD-21-S-DC-Pass-Power-Splitter-Combiner-500-2000MHz/164076236933?hash=item2633b4b085:g:uaIAAOSwR-9eQaf1

https://www.ebay.com/itm/New-Mini-Circuits-ZB6PD-2-S-800-2000-MHz-Power-Splitter/114155096838?hash=item1a942c8b06:g:jNIAAOSwedNedT92 https://www.ebay.com/itm/New-Mini-Circuits-ZB6PD-2-S-800-2000-MHz-Power-Splitter/114155096838?hash=item1a942c8b06:g:jNIAAOSwedNedT92

Now, these are simply pulled out of the first dozen or so hits on an eBay search for “Mini Circuits power splitter” on eBay. Anything that covers 1.5 GHz
will do the job.

Bob

On Apr 29, 2020, at 8:18 PM, Frank O'Donnell time@inkbox.net wrote:

On 4/29/20 6:01 PM, Bob kb8tq wrote:

Bob, thanks very much for the suggestions.

Five of the seven splitters in your list appear to offer a total of two
output ports. What I'm looking for is one that will accommodate
(specifically) three or four ports.

Of the remaining two on the list, this one:

has five outputs and costs $50. Probably usable, though I was wondering
if going with additional output ports could increase possible loss? And
also, the price isn't a show-stopper but is a little high for what I was
hoping for.

The other one:

isn't entirely clear to me. The text says it's a three-port, but I count
four visible connectors that look like output ports, and two more that
might be hiding under caps. This one goes for $19.90.

Given all of that, do either of these two seem like the optimal way to
go if I want to plug in three or four GPSDO's?

Thanks again,

Frank

Frank,

You are correct that more ports results in more loss -
Mini-Circuits has nice data sheets for their products.  The first one has about 6.8 dB loss at GPS frequencies. - a "perfect" splitter would have 6.0 dB

That last one is actually a SIX way splitter, two of the outputs have blue caps on them.  A little under 9dB loss at GPS frequencies.

https://www.minicircuits.com/pdfs/ZN4PD1-63HP-S+.pdf
https://www.minicircuits.com/pdfs/ZB6PD-2+.pdf

-Joe KM1P

From: time-nuts time-nuts-bounces@lists.febo.com on behalf of Frank O'Donnell time@inkbox.net
Sent: Wednesday, April 29, 2020 10:06 PM
To: time-nuts@lists.febo.com
Subject: Re: [time-nuts] GPS antenna splitter recommendation?

On 4/29/20 6:01 PM, Bob kb8tq wrote:

Bob, thanks very much for the suggestions.

Five of the seven splitters in your list appear to offer a total of two
output ports. What I'm looking for is one that will accommodate
(specifically) three or four ports.

Of the remaining two on the list, this one:

has five outputs and costs $50. Probably usable, though I was wondering
if going with additional output ports could increase possible loss? And
also, the price isn't a show-stopper but is a little high for what I was
hoping for.

The other one:

isn't entirely clear to me. The text says it's a three-port, but I count
four visible connectors that look like output ports, and two more that
might be hiding under caps. This one goes for $19.90.

Given all of that, do either of these two seem like the optimal way to
go if I want to plug in three or four GPSDO's?

Thanks again,

Frank

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.

Are you splitting power OUT OF GPSDO or are you splitting antenna into individual GPSDO?
Most, if not all GPSDO outputs power supply source to the antenna via the same connector RF signal comes in.  Simple splitters may or may not work.  There are GPS antenna splitters made for that.  HP/Symmetricon has 4 port device.
Symmetricom 58536A GPS 1x4 4-Way Active Antenna Signal Splitter Divider N Female | eBay

|
|
|
|  |  |

|

|
|
|  |
Symmetricom 58536A GPS 1x4 4-Way Active Antenna Signal Splitter Divider ...

In wireless base station pplications, poor isolation can disable cell sites. DC power applied to the splitter is...
|

|

|

If you shop around, you can find one for not much more than $100.  Beauty of this is, you can connect GPS to any port and only one will supply power to the antenna.  You can also daisy chain it.  I have 5 set up that way.

(Mr.) Taka Kamiya
KB4EMF / ex JF2DKG

On Wednesday, April 29, 2020, 10:14:06 PM EDT, Frank O'Donnell <time@inkbox.net> wrote:  

On 4/29/20 6:01 PM, Bob kb8tq wrote:

Bob, thanks very much for the suggestions.

Five of the seven splitters in your list appear to offer a total of two
output ports. What I'm looking for is one that will accommodate
(specifically) three or four ports.

Of the remaining two on the list, this one:

has five outputs and costs $50. Probably usable, though I was wondering
if going with additional output ports could increase possible loss? And
also, the price isn't a show-stopper but is a little high for what I was
hoping for.

The other one:

isn't entirely clear to me. The text says it's a three-port, but I count
four visible connectors that look like output ports, and two more that
might be hiding under caps. This one goes for $19.90.

Given all of that, do either of these two seem like the optimal way to
go if I want to plug in three or four GPSDO's?

Thanks again,

Frank

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.

Hi

Again, that’s just the candidates pulled out of the first dozen.

Three port splitters (in general) don’t exist. At least not on the “low cost” end
of things. You either use a 4 or a set of three 2 ports ( to make a 4 port).

Each time you split 2 ways, you “loose” 3 db ( equal power into two loads). A two way
will be 3 db and a 4 way 6 db. Yes, there is some fraction of a db that is truly lost and
not just split between the loads. Figure 0.1 db or check the spec sheet on the Mini
Circuits web site if you really need to be accurate.

With some shopping ( = going through all 200 or 500 listings), you should be able to find
something reasonable for < $30 delivered. I’d go for something up around 8 ports or so.
GPS stuff tends to multiply ….

Maybe this one if the guy will take a $20 offer:

https://www.ebay.com/itm/Mini-Circuits-8-Port-IF-Splitter-Combiner-15542-ZB8PD-2/182003853838?epid=1529816498&hash=item2a60466a0e:g:vzcAAOSwqYBWpoFo https://www.ebay.com/itm/Mini-Circuits-8-Port-IF-Splitter-Combiner-15542-ZB8PD-2/182003853838?epid=1529816498&hash=item2a60466a0e:g:vzcAAOSwqYBWpoFo

It will have 3 db more loss than a 4 way (so a total of 9 db).

At some point your combo of loss in the splitter, loss in the coax from the antenna, loss in the cable
from the splitter to the GPS is more than the device can handle. Figure that you need about 12 db
“left over” even for a fairly good device. People do make GPS amps if you go to far.

Bob

Frank, you are looking for something like ebay item 181914486443.
But it's not cheap...
Regards
Bll NL7F

On Wed, 29 Apr 2020 19:06:35 -0700, Frank O'Donnell wrote:

hash=item1f0e883ac5:g:tdoAAOSwAbxel2o~ <https://www.ebay.com/itm/Mini-Circuits-ZN4PD1-63W-S-RF-Power-Splitter-250-6000MHz-
Qty-Available-GOOD/133387795141?hash=item1f0e883ac5:g:tdoAAOSwAbxel2o~>

hash=item1a942c8b06:g:jNIAAOSwedNedT92 <https://www.ebay.com/itm/New-Mini-Circuits-ZB6PD-2-S-800-2000-MHz-Power-
Splitter/114155096838?hash=item1a942c8b06:g:jNIAAOSwedNedT92>

Bill Beam
NL7F

Frank, I'm using a GPS Source S14WI 4-way GPS splitter. Mine has options
for 20 dB amplification, Bias Select (how power is passed back to the
antenna), Antenna Monitor and N Female connectors. These are very
rugged, sealed units. They turn up on eBay from time to time; I was
fortunate to find several offered as New Old Stock. I will attach (I
hope) a data sheet.

Any splitter without amplification will have reduced antenna signal to
each output. If you will have a long coax run from the antenna to the
splitter as I do, use of an amplified spiltter will prevent further loss
within the splitter.

I also have a Symmetricon 58517A 8-way GPS splitter. This model has a
unity gain amplifier ahead of the splitter so the gain to each output is
specified as ±4 dB. A data sheet is attached. These also turn up on eBay.

Passive splitters offered on eBay are sometimes not GPS splitters but
passive satellite TV splitters. If the price is low, suspect a satellite
TV splitter. These also typically have poor isolation port-to-port.

My GPS antenna is located atop my roof, in the clear with
horizon-to-horizon view and fed with 5/8-inch Heliax flexible hard line
down to the splitter.

Four-way splitters are likely most common, with 8-way next. I've never
seen a 3-way splitter.

Larry

On 4/29/2020 5:18 PM, Frank O'Donnell wrote:

--
Best wishes,

Larry McDavid W6FUB
Anaheim, California  (SE of Los Angeles, near Disneyland)