[time-nuts] Survey plot as art.
stephen at tompsett.net
Tue Jan 10 02:13:53 EST 2017
This might be of use/interest for a GPS distribution amplifier:
On 09/01/2017 23:27, Bob kb8tq wrote:
>> On Jan 9, 2017, at 6:06 PM, Jay Grizzard <elfchief-timenuts at 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:
> 1) DC bias coupler on the input
> 2) Protection on the input
> 3) Saw filter on the input (say -3 db)
> 4) Fairly normal (Mini Circuits) low noise amp with appropriate gain (say 12 to 18 db)
> 5) two way splitter for the two banks of outputs (-3db)
> 6) two way splitter to each output (-3db)
> (obviously a 4 output device)
> 7) 3 db (to 9 db) pads on each output
> 8) DC blocks on all but one output.
> 9) 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.
>> 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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