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Author Topic: LNA + filter installation  (Read 1113 times)

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Offline motokops

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LNA + filter installation
« on: February 17, 2021, 09:13:34 AM »
I have this band pass filter and this amplifier LNA. What would be the correct and most effective order of placement respecting IN and OUT?


Antenna --- xxxxx  ----   xxxxx ----- USB RTL SDR receptor

Thanks.

Online Anmer

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Re: LNA + filter installation
« Reply #1 on: February 17, 2021, 09:22:54 AM »
Is it powered?
Here to Help.

Offline motokops

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Re: LNA + filter installation
« Reply #2 on: February 17, 2021, 09:35:39 AM »
Yes, of course.

All OK. Working perfectly. I just want to know the correct order so that it works fine. IN/OUT

« Last Edit: February 17, 2021, 09:43:49 AM by motokops »

Online Anmer

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Re: LNA + filter installation
« Reply #3 on: February 17, 2021, 09:45:18 AM »
Maybe:

Antenna - Filter - Amplifier - Receiver

No point amplifying data you don't need?
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Offline motokops

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Re: LNA + filter installation
« Reply #4 on: February 17, 2021, 09:59:30 AM »
is a good logical answer

Thanks

Offline abcd567

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Re: LNA + filter installation
« Reply #5 on: February 23, 2021, 12:38:46 AM »
Maybe:

Antenna - Filter - Amplifier - Receiver

No point amplifying data you don't need?

Fully Agree.

Just to see the difference, run an RF scan covering full frequency range of the dongle (24 Mhz to 1800 Mhz) in both the orders i.e.
Antenna>Filter>Anplifier>Dongle
Abtenna>Amplifier>Filter>Dongle

NOTE: This scan is pretty fast. One sweep across 24 Mhz to 1800 Mhz takes about 3 to 5 minutes. Few sweeps are enough

Do I Need A Filter - OPTION-4



« Last Edit: February 24, 2021, 03:06:07 PM by abcd567 »

Offline motokops

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Re: LNA + filter installation
« Reply #6 on: March 01, 2021, 12:58:26 AM »
I have done the test   Antenna - Filter - Amplifier - Receiver

The filter and amplifier works very well.

In the attached file the result

Thanks.