Архив за 18.04.2018

Comment on Hiring a Dev for Direction Finding & Passive Radar Software by Bated breath

But people have used FM for passive radar already.
e.g.
https://www.youtube.com/watch?v=aNfTjyECo94
The frequency shift due to Doppler would be proportional to the velocity (and the height). And the variation in the round trip time would be proportional to slant range.

Only the RPS2 (and RSP2pro[metal case]) has a clockin/clockout so you would need two of them. And two of the cheaper plastic ones would set you back $366.25 (inc shipping) or $426.25 for 2x RSP2pro (metal case inc shipping) . Which is a bit pricey. On paper it should be possible to do passive radar with a LimeSDR USB costing $299 (+$15 for shipping), but I’ve not seen anyone do this yet, which is a bit odd. I would suggest 2x pre order LimeSDR Mini’s currently at $139 (and $10 shipping each), since they have a clockout and clockin (on the back of the PCB). So $16 cheaper than a LimeSDR USB with fully frequency independent RX channels and $68.25 cheaper than two plastic RSP2’s. But the price of the mini’s will increase by $20 very soon so that would be $24 more than a LimeSDR mini and $28.25 cheaper than two RSP2’s. Of course you could always buy two RSP1A’s ($224.35 inc shipping) desolder the TCXO from one and sharing one TCXO between both boards.

If I’m totally honest, none of the current hardware is ideal (maybe the LimeSDR USB could do better if the TDD mode (Time Division Duplex) was bit easier to enable – https://discourse.myriadrf.org/t/limesdr-usb-synchronization-and-toggle-tdd-fdd-mode/1791/5 ).

I personally think waiting and seeing what rtl-sdr.com’s hardware is, would be the best course of action. Since they are starting to work on software it means, they either have prototype hardware ready now or at least very soon.

RTL-SDR Discussion • Re: Help listening to Shortwave

You don’t have to make a monopole. I was just saying that, even with an antenna that isn’t tuned to the right frequency range, you should still be able to pick up broadcast AM. Have you tried using Q-branch yet? I have the best luck with Q-branch

Statistics: Posted by HobbyMan — Wed Apr 18, 2018 9:50 pm


quick question about wxtoimg and linux

Where do we put the wxtoimg license information?

I have a key that works on my windows box, but I cant get linux wxtoimg to use/accept it.

submitted by /u/Obliterous
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HELP PLEASE Iam new to scanning on the pc, Iam also new to pc,s too.I am disabled so need to find things to keep me busy so when my old …

HELP PLEASE Iam new to scanning on the pc, Iam also new to pc,s too.I am disabled so need to find things to keep me busy so when my old handheld scanner died I bought a samsung tablet, and a rtl sdr unit, and a desktop discone antenna and down loaded sdr touch and driver and also touch key from the app store, they are all loaded and seem to be working but I do not know how to work or program it, there seems to be no user mannual or tutorials so I am stuck and would be greatfull if anyone out there could help me and if so could you please email this to me at jimmie.m.douglas13.58@gmail.com thanks everyone, waiting in hope Jimmie

RTL-SDR Discussion • Re: Help listening to Shortwave

I am using the software SDRSharp.

So if i understand correctly I can make a ground plane monopole using aliminium foil on some cardboard and a straight wire positioned above it?

And as always.....Than you all for your replies - Hobby Man, Ken

Statistics: Posted by illllm — Wed Apr 18, 2018 6:32 pm


RTL-SDR Discussion • Re: Help listening to Shortwave

ok so I was making a mistake of using I channel for direct sampling. I corrected that to Q and I can now pick up some MW bands. This is my test setup
IMG_1209.JPG
IMG_1210.JPG
IMG_1208.JPG
has anyone used this LNA before ? I dont see any difference using it.

I just wound up that 9:1 for test. I dont see a difference using that too.

Need to experiment some more.

Statistics: Posted by illllm — Wed Apr 18, 2018 6:28 pm


Comment on Hiring a Dev for Direction Finding & Passive Radar Software by AD5NL

You may be correct on that point. I’ve never actually implemented, just read a few posts on here and elsewhere about it.R

I had an idea: NOAA weather mapping onto a globe using our collective real time data. Has this been attempted before?

The idea would be to have peoples NOAA images automatically upload to a sharing platform along side information such as location and time of satellite pass. These images (or raw audio files?) would be tagged with 'NOAA-Something' for example. Then, an application would look for the latest images based on the tag and build a globe out of the collective passes. This could be a standalone application, or in the future moved to a web platform. Just an idea... Has this been attempted before?

Matt

submitted by /u/mechanicalraspberry
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Comment on Hiring a Dev for Direction Finding & Passive Radar Software by Andres M.

I hope the project comes to fruition, and that the resulting soft in Windows

RTL-SDR Discussion • Re: Help listening to Shortwave

Yes, your version 3 will tune down to 100 kHz with no additional hardware nor internal mods. One selects Direct Sample mode, as you've already done. What I suspect is we can figure this out via software settings, most likely gain. Even with just a few arm-lengths of wire you should be able to pickup local AM stations. You'll likely be able to pickup at least one of the NIST time transmissions on 2.5, 5.0, 10.0 or 15.0 MHz. Do tell us what software you're using.


-Kenn


https://ranous.wordpress.com/rtl-sdr4linux/

Statistics: Posted by Kenn — Wed Apr 18, 2018 5:19 pm


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