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Old 05-30-2019, 05:08 PM
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sarco2000 sarco2000 is offline
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Originally Posted by PSYOP Soldier View Post
that daiwa switch will work, you just need so239/pl259 pig tails for dongles..

https://www.amazon.com/RK-SMA-PL-259...SIN=B07RT1HTN8
Yes, it will switch back and forth right? But both dongles need an antenna at the same time. That's the way to set up scanning trunked systems on SDR. You need two dongles, each with an antenna.

So the SDR side of the switch output would pigtail to a SMA splitter (not switch) with both pigtails out of the splitter going to the dongles, both being connected to the one antenna.

Is it possible? Or do I have to get 2 antennas?

.
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Old 05-30-2019, 05:29 PM
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you got me stumped, but go here: http://www.mfjenterprises.com/Catego...p?sub=0&ref=21

they may have it.....
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Old 05-30-2019, 07:30 PM
franklin franklin is offline
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Quote:
Originally Posted by sarco2000 View Post
Yes, it will switch back and forth right? But both dongles need an antenna at the same time. That's the way to set up scanning trunked systems on SDR. You need two dongles, each with an antenna.

So the SDR side of the switch output would pigtail to a SMA splitter (not switch) with both pigtails out of the splitter going to the dongles, both being connected to the one antenna.

Is it possible? Or do I have to get 2 antennas?

.
Try one of these https://www.ebay.com/itm/1Pcs-RF-Mic....c100005.m1851

If you want the best sensitivity put an LNA before the splitter.

https://www.ebay.com/itm/Low-Noise-L...4AAOSwhfxZbW~-


Get some SMA pads because you will probably have too much gain. Place the pads between the LNA output and the splitter. Try 3 or 6 dB if the front end of the SDR appears to have distortion.

Ideally the LNA gets mounted close to the antenna but being outdoors it's a challenge. Also LNAs and also SDRs don't have much surge immunity on the input. Good chance it blows the input if you have a nearby lightening strike. LNAs are cheap enough to act as fuses to protect the SDR. I'd still put a surge arrestor in front of the LNA with the lowest voltage gas tube I could find. (When you select gas tubes for transmitters you need to size the tube for the Tx power. For Rx get the lowest you can find.)
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