As others have said, these LNAs don't support passive passthrough - when the power is off, it blocks the signal. You can't compare reception with and without power, you have to physically disconnect the LNA from the antenna path. Some (much) more expensive LNAs do support passive passthrough using coaxial relays.
Depends on a few things- can your SDR/ device provide power directly through it's connections... is it enough ....3.3v? 5v? Those are common figures- but some amps will require >12v+...in which case either another item needs to be incorporated into your line called a bias which provides a DC power supply to the line amongst possibly other functions ....take care with such setups...you dont wanna burn your sdr or amp@@alphaadhito
When you trun off amp You should remove connectors from lna to antanna and sdr And connect anteena connector directly to the sdr..and now see the result
careful I found some of those to have fake parts resulting in a higher noise figure in the 2-3 db range. If you buy a pre-amp buy the ones marked 0.6db and are in machined aluminum cases. They are about 2-3 times the cost than those cheap ones but I have not yet found one with a fake or bad chip. Out of 10 bought all had .45-.6db noise at 1 ghz ,whereas of 10 of the cheap ones 4 were good the rest were terrible.
Hello and thanks for good videos I have a question iwant to buy lna module there is some types like 20db gain I know If I put 50mv pp in input I will have a 500mv output but ididnt tested it for 400mv input will I have 4v pp at output on 50 ohm load If not why???
How did you turn the amp on and off? Did you remove the amp when you turned it off? With no power on the amp I doubt much signal can pass through the amp.
So I thought i had a grip on the ins & outs of the workings of these- I have a Open Source SDR amp that came with my HackRF....being cautious as to not blow the HackRF's inners i went to test out the gain....In your vid there's a visible difference...mine? Nothing like that... i swear that it did at a time-- but never measured it like this.... Just saw results like your's receiving all those craft when the amp had been turned on.. I especially wanted to get things right since I was working on a TX 'ing idea where I needed to daisy chain another amp- and unfortunately, only 2nd'ary amp i got is one that came with EMC test probes- i am under the impression the "in" (rx) and "out" (tx) are reversed- againn, my attempts at figuring out have been futile/ i don't want to be setting up a situation where 1 amp is tx'ing and the 2nd amp rx'ing. .... Any suggestions on how to determine this? Tools to use to do so? Power-meter? Oscilloscope? I guess a spectrum analyzer eh? Also, you use the amp for ADSB- well, at least demonstrated its handy work boosting the results of how many craft were around... in that setup which way are you amplifying the signal? Are you flipping it to boost rec'd signals? Or stays same where your are amplifying your TX? Thanks in advance. oh the amp and emc probes are: (actually really nice probes but the amp requires a plug power jack with >12v) www.aliexpress.com/item/1005005923571278.html The original amp that came w/ HRF--50M-6GHz Low Noise : www.aliexpress.com/item/1005002172847806.html
That's nice! I was looking because I also bought such an amplifier. ATTENTION 5 Volts!!! I think I blew one up! (12Volt, stupid of course!) It was nice to see your video thank you for your information! Healthy and Friendly Greetings from the Netherlands! Rob
With Enought Effort You Mean 0 Better ANtennas For The 1.8Meter Band / VHF So You Could Get Better Receptionm And Better Images, This Is So Awsome , Thank You For The Video =) Wish I Could Afford Such Things, I Have RTL.SDR , But No Filterrs, I Tried To Made My Own Filters, But They Work Only For 80 To 10 Meters !
You should go for some filters immediately after the LNA (which should be first after the antenna since it governs the whole system's noise performance as Friis formulas for noise predicts). I'd opt in for filtering since you're receiver has no preselection at all. All signals, even if outside the theoretical receiving frequency will have negative impact on the receiver performance (signal to interference ratio) by producing intermodulation or saturating your receiver (no matter which frequency you dial in). That is especially true for cellular and WiFi services which are by far generated most near to your receiver and thus the most powerful ones. Filters will help to keep those strong signals away from your receiver so they won't do so much harm (degrade your receiver performance).
Do you have videos on how to install these other softwares, like for example the NOAA Sat and ADSB. Basically a video tutorial on how to do this. I am really intrigued about this. I own the RTL-SDR v3 and in another few months im going to get another one. And I have AirSPY SDR and other SDR versions of it. I also just purchased 2 of those amplifiers.
I don't, primarily because I don't have the patience to document all the trial and error and secondly because they are usually quite painful to edit - though I wish I did now as I also would have to learn this all again just to install it. If I recall I used some readily available resources on the web and a chunk of experimentation. It is fascinating, but a shame you need so many random applications and processes to get it to work 😂
Get it outside as close as possible to the antenna and on a short a cable as possible ... then it is less likely to amplify induced noise as well as signal. Buy an RSP1A from SDR Play. Well worth the money. Much better and lower signal to noise ratio than the others ... 73 DE M0XXX
He mentioned Diskcone, which is great for areas around you. It has a horizontal doughnut shaped lobe, not great for satellites above you. There are many alternatives ie yagis printed on a pcb. It also helps to know the satellites polarization - can be horizontal, vertical, left or right handed circular (antenna is helix on a reflector)!
@@backofficeshow OK, I'm just curious, to use this LNA tool, because I want to shoot hotspots, or try experiments. maybe i will try. thank you your video was very interesting. success for you.
The SPF5189Z (A pHEMT MMIC Device) is spec'd at 0.6 db Noise Figure with 15 db Small signal Gain rating......0.6db Rf Signal Gain would be a Useless device.....
0,6dB noise figure, that is LNA Problem is that this IC has high gain at max voltage Vcc, but easy dies from it, its best at litle less than 4 to 3,5 V
As others have said, these LNAs don't support passive passthrough - when the power is off, it blocks the signal. You can't compare reception with and without power, you have to physically disconnect the LNA from the antenna path. Some (much) more expensive LNAs do support passive passthrough using coaxial relays.
You can normally power these with a BIAS-T on your SDR along the coax. You also want the LNA to be as close to the antenna as possible.
I'm so pleased with the performance I will definitely be moving this to the masthead.
So does it mean I just plug the LNA and does it need another device to get the power from the coax?
Depends on a few things- can your SDR/ device provide power directly through it's connections... is it enough ....3.3v? 5v? Those are common figures- but some amps will require >12v+...in which case either another item needs to be incorporated into your line called a bias which provides a DC power supply to the line amongst possibly other functions ....take care with such setups...you dont wanna burn your sdr or amp@@alphaadhito
You need a seperate bias tee to do this.
When you trun off amp
You should remove connectors from lna to antanna and sdr
And connect anteena connector directly to the sdr..and now see the result
Way chill work - TY for shring. :)
Hey! How you managed to modify the gain of the amplifier?
turn off AGCs, manually tune the gain till you start to lose signal
Superglue and bakingsoda mixed will make a good base so it wont bend and break off
careful I found some of those to have fake parts resulting in a higher noise figure in the 2-3 db range. If you buy a pre-amp buy the ones marked 0.6db and are in machined aluminum cases. They are about 2-3 times the cost than those cheap ones but I have not yet found one with a fake or bad chip. Out of 10 bought all had .45-.6db noise at 1 ghz ,whereas of 10 of the cheap ones 4 were good the rest were terrible.
Pritty much all the cheap ones have problems . Fortunately for the most part they are good enough for applications like this !
Hello and thanks for good videos
I have a question iwant to buy lna module there is some types like 20db gain I know If I put 50mv pp in input I will have a 500mv output but ididnt tested it for 400mv input will I have 4v pp at output on 50 ohm load If not why???
How did you turn the amp on and off? Did you remove the amp when you turned it off? With no power on the amp I doubt much signal can pass through the amp.
If your using a RL-SDR V3 it has a bias tee you can utilize that actually turns the LNA on and off.
Coorrect exactly...That is right...
When turn off the amp signal no pass trught amp and antenna to sdr
So its not a good comparassing test
Please tell us about the interconnection adaptor types. Maybe antenna side need One is "SMA male to type F Female". Do I need "SMA male to SMA male"?
So I thought i had a grip on the ins & outs of the workings of these- I have a Open Source SDR amp that came with my HackRF....being cautious as to not blow the HackRF's inners i went to test out the gain....In your vid there's a visible difference...mine? Nothing like that... i swear that it did at a time-- but never measured it like this....
Just saw results like your's receiving all those craft when the amp had been turned on..
I especially wanted to get things right since I was working on a TX 'ing idea where I needed to daisy chain another amp- and unfortunately, only 2nd'ary amp i got is one that came with EMC test probes- i am under the impression the "in" (rx) and "out" (tx) are reversed- againn, my attempts at figuring out have been futile/ i don't want to be setting up a situation where 1 amp is tx'ing and the 2nd amp rx'ing.
.... Any suggestions on how to determine this? Tools to use to do so? Power-meter? Oscilloscope? I guess a spectrum analyzer eh?
Also, you use the amp for ADSB- well, at least demonstrated its handy work boosting the results of how many craft were around... in that setup which way are you amplifying the signal? Are you flipping it to boost rec'd signals? Or stays same where your are amplifying your TX?
Thanks in advance.
oh the amp and emc probes are:
(actually really nice probes but the amp requires a plug power jack with >12v) www.aliexpress.com/item/1005005923571278.html
The original amp that came w/ HRF--50M-6GHz Low Noise : www.aliexpress.com/item/1005002172847806.html
No comparison between the amp in and out of the circuit?
That's nice!
I was looking because I also bought such an amplifier.
ATTENTION 5 Volts!!! I think I blew one up! (12Volt, stupid of course!)
It was nice to see your video thank you for your information!
Healthy and Friendly Greetings from the Netherlands!
Rob
Hi Rob!
Thank you for reaching a comment. 12v ouch 😂 Did you notice right away, it just wonder why you were not getting any gain?
With Enought Effort You Mean 0 Better ANtennas For The 1.8Meter Band / VHF So You Could Get Better Receptionm And Better Images, This Is So Awsome , Thank You For The Video =)
Wish I Could Afford Such Things, I Have RTL.SDR , But No Filterrs, I Tried To Made My Own Filters, But They Work Only For 80 To 10 Meters !
08:41 How did you set the LNA gain ?
I don't recall, but there is a slider in the software that alters it. I feel it was quite prominent in the user interface
@@backofficeshow i am unable to find that slider :( without that LNA gain option all i hear is noise
@@aishwaryap look at page 4 www.haje.nl/pub/pdf/communicatie/sdr_ontvangst/installatie-rtl-sdr-windows-linux.pdf
You should go for some filters immediately after the LNA (which should be first after the antenna since it governs the whole system's noise performance as Friis formulas for noise predicts). I'd opt in for filtering since you're receiver has no preselection at all. All signals, even if outside the theoretical receiving frequency will have negative impact on the receiver performance (signal to interference ratio) by producing intermodulation or saturating your receiver (no matter which frequency you dial in). That is especially true for cellular and WiFi services which are by far generated most near to your receiver and thus the most powerful ones. Filters will help to keep those strong signals away from your receiver so they won't do so much harm (degrade your receiver performance).
i want to get one of those LNAs so much.. but my weekly allowance is 2 dollars (100 uah)... and sellers here overprice it to 12 bucks....
6 weeks and you will be golden
hello sir..can i use this module to boost my indoor mobile phone signal? 4g lte?
No, it will not work
Sir how much is the power supply
Can i hook one of these up between an RF modulator and an antenna to boot the signal from the modulator, so i can transmit to TV sets in my house?
can i use it for wifi remote drone? so the drone can reach distance more far from remote?
Do you have videos on how to install these other softwares, like for example the NOAA Sat and ADSB. Basically a video tutorial on how to do this. I am really intrigued about this.
I own the RTL-SDR v3 and in another few months im going to get another one. And I have AirSPY SDR and other SDR versions of it. I also just purchased 2 of those amplifiers.
I don't, primarily because I don't have the patience to document all the trial and error and secondly because they are usually quite painful to edit - though I wish I did now as I also would have to learn this all again just to install it.
If I recall I used some readily available resources on the web and a chunk of experimentation.
It is fascinating, but a shame you need so many random applications and processes to get it to work 😂
Get it outside as close as possible to the antenna and on a short a cable as possible ... then it is less likely to amplify induced noise as well as signal. Buy an RSP1A from SDR Play. Well worth the money. Much better and lower signal to noise ratio than the others ... 73 DE M0XXX
What is the software that you have used to get satellite image?
When you power off lna
Signal no pass trught it to sdr directly you should remove lna compeltly from line of sdr...
What ANtennaa You Are Running Ser?
He mentioned Diskcone, which is great for areas around you. It has a horizontal doughnut shaped lobe, not great for satellites above you.
There are many alternatives ie yagis printed on a pcb. It also helps to know the satellites polarization - can be horizontal, vertical, left or right handed circular (antenna is helix on a reflector)!
I want to use an amplifier for Flight Radar to use on 80 meters of cable. will it work?
It would work best if you can use it near the antenna rather than your radio end, but worth a try
No DC Block between the SDR and LNA?
That was fascinating Andrew.
Thank you, it's an interesting little hobby, especially for the money 😂
Software please?
Thanks by subtitles
for about £10 extra you can get it in its own case and with a usb+ backup battery
I have question RF out should be connected to antenna?
Out goes to the SDR
Sorry Oot, i have question
can it be LNA for wifi signal booster?
Not really. Your WiFi device probably already it's using am LNA internally
@@backofficeshow OK, I'm just curious, to use this LNA tool, because I want to shoot hotspots, or try experiments. maybe i will try. thank you your video was very interesting. success for you.
Would it be possible to boost 4G DL-only with this?
You would need to ensure it covers the correct frequency. But it would only work in receive
The SPF5189Z (A pHEMT MMIC Device) is spec'd at 0.6 db Noise Figure with 15 db Small signal Gain rating......0.6db Rf Signal Gain would be a Useless device.....
Although its rated for 5 volts a 3.7 lipo battery would be just fine.
Having the LNA inline turned off is not the same as having the LNA not inline
0.6dB gain? That's not a LNA
0,6dB noise figure, that is LNA
Problem is that this IC has high gain at max voltage Vcc, but easy dies from it, its best at litle less than 4 to 3,5 V
mono
А по русски видео можно.
Can i put it on the wifi cable antina?
No, out will not work for a transmitter