Yo Richard! On Wed, 13 Nov 2019 16:42:37 -0600 Richard Laager via devel <devel@ntpsec.org> wrote:
> On 11/13/19 1:43 PM, Gary E. Miller via devel wrote: > > Add a GHz power divider for $10 and run all 3 on one antenna. > > So basically any splitter that has 3-4 outputs, e.g. SMA connectors, > and a rating of 1-2 GHz (to cover the GPS bands)? Pretty much. All the cheap ones on ebay that are as you say have worked for me, and others. But triple check the pass band. > Does this assume an unpowered antenna and GPS receivers that are not > outputting DC power on their antenna port? Otherwise, if they are all > trying to power an active antenna and are connected to the splitter, > it seems like I might have a Bad Time and let the magic smoke out? Some on ebay have DC blocks integrated, some do not. Rarely is that mentioned in the description.i A very few have DC blocks on all but one port. Ebay stock rotates fast, and it is a crap shoot what you get for DC characteristics. For power splitters without DC blocks, I buy SMA DC blocks like this: https://www.ebay.com/itm/factory-directly-SMA-male-to-female-Stainless-steel-RF-Coaxial-DC-block/252127796529 $8! So as much as the GPS! Ouch. Better to buy a $10 4 port splitter that blocks DC. Then use a power injecter (bias tee) between the antenna and the splitter. Like this: https://www.ebay.com/itm/SMA-female-RF-Biaser-Bias-Tee-10-6000MHz-FOR-HAM-Radio-RTL-SDR-LNA-US/333390889549 Then I can swap GPS and the antenna stays powered. Also allows me to use older (12V) antennas. Some GNSS receivers will still complain, they'll say the DC power is too low. Ignore that warning. RGDS GARY --------------------------------------------------------------------------- Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703 g...@rellim.com Tel:+1 541 382 8588 Veritas liberabit vos. -- Quid est veritas? "If you can't measure it, you can't improve it." - Lord Kelvin
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