Multiple Antenna Inputs to one SDR receiver

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Ubbe

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Theres one WiFi 2,4/5Ghz antenna and one LTE 644-2700MHz antenna and one receive only GPS antenna with a 30dB gain LNA.

You would like to use some sort of combiner to be able to receive GPS signals and transmit on WiFi and LTE at the same time?

Low WiFi are in the same band as LTE so there's no way to be able to use a combiner and filters to direct the WiFi frequency to only the WiFi antenna.

You have to switch cables, costs nothing, or use an antenna switch to choose the correct antenna.

The Hack RF doesn't have dual mode operation, it can either receive GPS signals or receive/transmit WiFi/LTE. So just extend the coaxes and use the appropriate one to the Hack RF.

It would help if you explained what you plan to do with the antenna.

/Ubbe
 

braymond

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Oct 1, 2017
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Thanks Ubbe,
Mainly going to use it for general scanning, wardriving, tinkering, etc. I don’t mind switching cables just wasn’t sure if there was a good way to combine the inputs into a single system. Still learning about antenna theory and how rf systems work.
 
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N9JIG

Sheriff
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Kind of a cool scanning concept.

If one were able to use all the outputs on the 7/800 band it might make a neat way to use SDR's to monitor a large trunking systems. Are the outputs all tied to a specific band or can they be changed?
 

braymond

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Oct 1, 2017
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They can be changed within the SDR software. You can actually monitor a whole band with a single antenna and SDR if you have enough CPU to write the output to files.
 
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