File: chud8.png (252 KB, 579x738)

252 KB PNG

cheap SDRPlay rsp1a for home projects
bladeRF for work
>>108223155 (OP)
>Can one of you anons speak to the quality of these Chinese FPGAs?
Clones suck most of the time.

File: rtl-sdr.jpg (193 KB, 1920x1080)

193 KB JPG

>>108223155 (OP)
SDR? pic rel is best approach
>I've got two
>one dedicated to ADS-B stuff
>second one is currently doing P25 stuff

You wont find the good stuff unless you go to shangai snd then smuggle it back.
(4/5g full duplex)

Why not just get a hackrf and use that with your computer?

>>108225121
expensive and you get added to every glowie database if you order it

>>108223155 (OP)
>Can one of you anons speak to the quality of these Chinese FPGAs?
I can't, I've never had one.
Casual glance, tho, it appears to be an open source design. So assuming that was good initally and they've managed to fab it without fucking it up, chances are good.

>>108223238
>Clones suck most of the time.
Good thing that was built to be what it is then, huh?

>>108224070
That's RX only?

>>108225121
>Why not just get a hackrf
$200 vs $2?
Just a guess mind...

>>108225135
>added to every glowie database if you order it
If I'm not already there they f'kin slackin'

I just got a new job somewhere that does radar. What can I buy to learn some more about this stuff? I know absolutely nothing

>>108226002
how did you get the job then?

>>108223155 (OP)
I have limeSDR and used bladeRF, both are great
>>108225121
it's not full duplex
>>108225135
>glowie database
really? glad I never ordered it under my name then lmao
>>108226197
prolly pajeet, nepo, or a woman
a couple months ago I applied to radar engineer job, 4 interviews and I aced them all, technical or behavioral and in person, after 2.5months they sent a generic email saying suck it up we went with another dude

>>108223155 (OP)
imma drop some spoiler here
antenna > sdr equipment if your antenna is shit all you're going to see and hear is noises and emf

File: file.png (416 KB, 894x658)

416 KB PNG

>>108224070
Are these two virtually the same?

>>108226613
Rtl is only for recieving thoughtbeit

>>108223155 (OP)
any toddler level guide to SDR ?

>>108226613
AFAIK - fair warning, I'm not an ADR expert - they are the same.

Well. They sport the same SDR chips... Mine cost a tenner...
As another anon points out (and I did previous) they're RX only. But they stil good enough to grab data off satellites as they go passed...

>>108226636
I'm not sure 'bout that none...

Grab >>108226613 one o them. Should be able to find for cheaps. Then ofc to assume you'll want to do more than DVB you might want some software to go with that...
SDR++ and analog signal hunter are good shouts, I thought...
Other than that - play? What you wanting to do with such a beastie anyhay?

rtl_tcp nearly every sdr-warez speaks it

using mine to spy on public services after being frustrated with op25 i noticed r/rtlsdr mention https://github.com/TrunkRecorder/trunk-recorder

>>108226613
The antenna on this one fucking sucks.

File: 71ulbD0GdUL.jpg (159 KB, 1500x1500)

159 KB JPG

Since we're on the topic of SDR - can anyone help me diagnose what the FUCK happened to my stock dipole antenna that came with picrel?
It used to work amazingly well and I was picking up ADS-B from hundreds of km away. Now suddenly anything above ~500 mhz is pretty much just flat noise. FM broadcast and the 70cm Ham band still works ok somewhat. The dipole has spent a significant time outside exposed to the elements.
I checked the connectivity between each pole and its respective center pin/shielding and it seems fine. There doesn't seem to be any shorts or signs of corrosion either.
Should I bother trying to fix it or just get a new antenna?

File: coco-for-ads-b.png (11 KB, 766x1000)

11 KB PNG

>>108229731
If you're using it for ADS-B, built a co-co antenna.
My antenna on top of my house (about 25') off the ground picks up ADS-B from aircraft at FL350 that are 200 miles away.
> pick good coax
> build slowly
> use a multimeter to check for fuck ups

>>108226287
>it's not full duplex
just get two, retard

>>108226197
I don’t know. By knowing C++ and embedded Linux I guess. I was honest in the interview about having zero radar knowledge. I’m trying to do some learning on the side to fill in the theoretical gaps hopefully with some smaller affordable hardware.

>>108226287
What does full duplex do and what devices do duplex?

>>108226287
>limeSDR
$1k damn I'm too poor for that, is there something like adalm pluto but with HF bands coverage?

>>108229731
the antenna is probably corroded on the inside

>>108223155 (OP)
https://meshtastic.org/

???

>>108229731
>Now suddenly anything above ~500 mhz is pretty much just flat noise
Interference?

>There doesn't seem to be any shorts or signs of corrosion either
Pollution building up a film? Shit that builds up on your car will build up there... Not as heavy, but still. Might effect. /me shrugs.
>>108234656
That?

>just get a new antenna?
That.
Dipole? See what tickles yur clittles in Yagi...
And whilst you're at it, as you have an SMA jack anyway, why not take a gander at boosters that'll dribble you up. Should only be RX so can shave costs with a ½duplex jobbie, and not puttin' out you don't *really* have to worry about 'legal' limits to strength in terms of watts, and double, or even triple digits may be on the cards... Depends what you'd wanna spends...

>>108233826
>full duplex do
Long story short, shouts and listens at the same time. ½duplex is shouting or listening...

>>108234686
??
I'm not OP, btw.
But what you mean? In theory, suttin' like meshtastic could be used on top of this... I've no personal experience, but RF is RF after all.

Might need to be mindful that TX frequencies you can use with impunity are limited.
Generally, you can step outside the rewls, no biggie.
But if someone notices, depending on the scale of what you fuck up that causes them to notice, they will make a point of finding you...

>>108224070
You cannot transmit with that tho

>>108226002
>surrounded by experts in radar
>still asks nonnymousse for help