Re: [time-nuts] Survey plot as art.
gem@rellim.com said:
Care to recommend any that have SMA connectors? I have found that a 3dB
difference in antenna can degrade my data quality, it would be interesting
to see how the 3dB loss of the splitter affects thins.
There are 2 options for splitters. One is to use cable-TV splitters. They
probably have F connectors so you will need a kludge of adapters.
The other is a "real" GPS splitter such as the HP.Symmetricom 58535A or
58536A. They usually have N connectors. They usually include an amplifier
so you don't see the 3 dB loss. (They get power from the coax the same way
the antenna does.)
--
These are my opinions. I hate spam.
Does anyone know of any schematics for amplified GPS splitters floating
around out there? I looked a while back and couldn't find anything. I
use a 58536A right now, but it's big and I hate having to have N to SMA
cables. It would be awesome to be able to roll my own with all the
connectors I want on it...
-j
On 1/9/2017 12:43 PM, Hal Murray wrote:
The other is a "real" GPS splitter such as the HP.Symmetricom 58535A or
58536A. They usually have N connectors. They usually include an amplifier
so you don't see the 3 dB loss. (They get power from the coax the same way
the antenna does.)
Hi
On Jan 9, 2017, at 6:06 PM, Jay Grizzard elfchief-timenuts@lupine.org wrote:
Does anyone know of any schematics for amplified GPS splitters floating around out there? I looked a while back and couldn't find anything. I use a 58536A right now, but it's big and I hate having to have N to SMA cables. It would be awesome to be able to roll my own with all the connectors I want on it…
The standard design is pretty simple:
- DC bias coupler on the input
- Protection on the input
- Saw filter on the input (say -3 db)
- Fairly normal (Mini Circuits) low noise amp with appropriate gain (say 12 to 18 db)
- two way splitter for the two banks of outputs (-3db)
- two way splitter to each output (-3db)
(obviously a 4 output device) - 3 db (to 9 db) pads on each output
- DC blocks on all but one output.
- DC bias coupler on the one “magic” output.
Some designs put a second filter after the amp. Some designs use ceramic filters rather than SAW’s.
Some designs go up to quite a few (like a dozen) outputs. Some have external power rather than
the bias pickoff / pass thru.
Bob
-j
On 1/9/2017 12:43 PM, Hal Murray wrote:
The other is a "real" GPS splitter such as the HP.Symmetricom 58535A or
58536A. They usually have N connectors. They usually include an amplifier
so you don't see the 3 dB loss. (They get power from the coax the same way
the antenna does.)
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This might be of use/interest for a GPS distribution amplifier:
http://huprf.com/huprf/wp-content/uploads/2016/03/DA1-4-Manual-V2_03.pdf
On 09/01/2017 23:27, Bob kb8tq wrote:
Hi
On Jan 9, 2017, at 6:06 PM, Jay Grizzard elfchief-timenuts@lupine.org wrote:
Does anyone know of any schematics for amplified GPS splitters floating around out there? I looked a while back and couldn't find anything. I use a 58536A right now, but it's big and I hate having to have N to SMA cables. It would be awesome to be able to roll my own with all the connectors I want on it…
The standard design is pretty simple:
- DC bias coupler on the input
- Protection on the input
- Saw filter on the input (say -3 db)
- Fairly normal (Mini Circuits) low noise amp with appropriate gain (say 12 to 18 db)
- two way splitter for the two banks of outputs (-3db)
- two way splitter to each output (-3db)
(obviously a 4 output device) - 3 db (to 9 db) pads on each output
- DC blocks on all but one output.
- DC bias coupler on the one “magic” output.
Some designs put a second filter after the amp. Some designs use ceramic filters rather than SAW’s.
Some designs go up to quite a few (like a dozen) outputs. Some have external power rather than
the bias pickoff / pass thru.
Bob
-j
On 1/9/2017 12:43 PM, Hal Murray wrote:
The other is a "real" GPS splitter such as the HP.Symmetricom 58535A or
58536A. They usually have N connectors. They usually include an amplifier
so you don't see the 3 dB loss. (They get power from the coax the same way
the antenna does.)
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To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
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and follow the instructions there.
--
Stephen Tompsett
I realize that, in theory, the designs for these things are relatively
straightforward. Unfortunately, the vast majority of my experience is
in the digital world, so the best I could probably do on my own is
Frankenstein some hopefully-appropriate circuits together and hope the
result is usable.
...that's a bit too luck-based for my tastes, so I was hoping someone
had already put something appropriate together that I could just lay out
and build. I'm actually a bit surprised that (apparently) nobody on
this list has done so, given how many GPSs we all must collectively own...
(...anybody want to? I'll fund the PCB & components for you to test your
design...)
-j
The standard design is pretty simple:
- DC bias coupler on the input
- Protection on the input
- Saw filter on the input (say -3 db)
- Fairly normal (Mini Circuits) low noise amp with appropriate gain (say 12 to 18 db)
- two way splitter for the two banks of outputs (-3db)
- two way splitter to each output (-3db)
(obviously a 4 output device) - 3 db (to 9 db) pads on each output
- DC blocks on all but one output.
- DC bias coupler on the one “magic” output.
Some designs put a second filter after the amp. Some designs use ceramic filters rather than SAW’s.
Some designs go up to quite a few (like a dozen) outputs. Some have external power rather than
the bias pickoff / pass thru.