Posible to use one 1090 antenna to feed multipul feeders?

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1

Hi there,
I’m hoping someone can help me with this.
Is it possible to use one 1090 antenna and feed that into multipul feeders?
We now have three 1090 antennas feeding into 3 different feeders, can we remove 2 of those and have a splitter that will feed all 3 feeders? Maybe a powered splitter?

Thanks,
Mark Stroud

2

You could look at this. Make sure to terminate the unused ports https://www.minicircuits.com/pdfs/ZB4PD1-2000+.pdf

3

You will most likely need to amplify the signal for each receiver.

4

Yea, this might work. I’ll call them asd see what they say, then report back.

5

ua549,
See above, looks like that would work. It’s DC Pass and, if i’m reading the spec sheet correctly, would amplify the output signals.

6

@markstroud
Put the LNA between the antenna and the splitter so you amplify the signal into the splitter.

2 Likes
7

So I’m guessing the splitter will not amplify the signal?

8

The specs that were posted shows a 6+ dB insertion loss plus a 6dB splitter loss for a total of over 12 dB loss.

9

Insertion loss is less than 1 dB above splitter loss of 6 dB, so the total loss is less than 7 dB

image

 

10

At 6dB of loss you would be losing 75% of the received signal strength, so you’d definitely need an LNA on every dongle plus a way to provide power to them.

1 Like
11

Not necessary to have LNA at every dongle. Just ONE LNA between Antenna and input to Splitter is enough, as rightly suggested by @LawrenceHill.

 

1 Like
12

Oh, you’re right. I was envisioning the setup incorrectly in my head. I’m still trying to wake up here. :slightly_smiling_face:

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So who makes a good LNA and where do i buy one?
thanks everyone…

14

I am using the Uputronics filter and it works for me flawless

Not sure if it’s the same device, but Jetvision also offers an active splitter (pretty expensive, four antennas would be cheaper):

15

This is what I use:
https://www.rtl-sdr.com/product/rtl-sdr-blog-ads-b-triple-filtered-lna-bias-tee-powered/

Edit:
You will also probably need something like this in order to power it:
https://www.ebay.co.uk/itm/403531846997?hash=item5df45f5555:g:HwsAAOSwBmhgDouI

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The Uputronics can be powered via USB. Either a seperate power supply or via USB from the connected Raspberry.

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