Архив за 28.07.2019

LRPTOfflineDecoder won’t save image from .S file

I recorded a really nice Meteor M2-2 pass. I put it into the latest version of LRPT-OD from u/happysat77, and the image looks great. It's a long pass with decent reception (except when the satellite was directly overhead). However, when I try to save the .bmp file, it doesn't work. Can someone decode this for me?

https://wp.me/ab91tp-24 72k OQPSK from latest Russian Meteor.

Just the direct output of the decoder, only, please.

submitted by /u/ka_re_t
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Problem with my antenna/wiring

I recently finished constructing a double-cross dipole, however when I originally plugged it in to test on the FM band, I got no reception, although I noticed that when I wiggled the jack around I sometimes got a brief burst of signal. After further testing, I discovered that I got pretty good reception if I just connected the center core, but once both the outer sheath and the center core were connected to the sdr, the signal quality essentially dropped to zero. Upon further testing, this seems to just be due to the fact that the coax itself was acting as an antenna and none of the signal was likely coming from the actual antenna itself.

I assume that this is a problem with my wiring harness connecting the four dipoles, although I made sure to measure the lengths of the wires precisely to compensate for the phaseshift between the two sets of dipoles and the propagation delay of the medium. I haven't yet put ferrite cores on the coax but I don't think that would inhibit any type of operation whatsoever. Has anyone else had similar problems? Thanks

submitted by /u/0x4d_
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My First Feng-Yun 3C HRPT capture! …Hello Michigan!

My First Feng-Yun 3C HRPT capture! ...Hello Michigan! submitted by /u/quartapound
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Signal Identification Help • Re: Strange signal from rtl_power on satellites frequencies

looks like all these are noises from your local environment. Large drifting noise is something like switching mode PSU. Small dots are switching mode controller on your PC motherboard and "probably vdl2 signal" is a self spur of RTLSDR.

But these small dots may be some automatic CW beacon from a local transmitter in your area.

Statistics: Posted by radiolistener — Sun Jul 28, 2019 7:08 pm


User Projects • Re: I need some advice in creating IQ processing software

yes, usual harddrive has some limit at about 50-100 megabytes per second. So if you're using complex 64 bit, it will be limited with about 390000-780000 samples per second. But SSD harddrive has much more higher speed.

Regarding to FFT, if you're want your own implementation, you're needs to use highly optimized algorithm and use SSE CPU extensions for optimization. Another way is to use GPU acceleration written in CUDA.

Statistics: Posted by radiolistener — Sun Jul 28, 2019 6:58 pm


What do these colors mean? They look like depth. (Great Lakes)

What do these colors mean? They look like depth. (Great Lakes) submitted by /u/wavyfollower
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Signal Identification Help • Re: Tetra IQ sample that can be decoded?

Well you ask about Tetra Data to "decrypting".

Statistics: Posted by Username — Sun Jul 28, 2019 4:27 pm


How to get started with weatherfax?

I want to receive weatherfax images but I have no idea on where to start. I searched on Google but didn't find anything really useful. I have the RTL-SDR v3 with v dipole kit and I have ordered some SMA plugs so I can make my own antenna.

What else do I need to receive weatherfax? And where do I find when they are transmitting? And as last, what software do I need?

Thanks.

submitted by /u/melvin2204
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Signal Identification Help • Re: Tetra IQ sample that can be decoded?

Username wrote:
Sun Jul 28, 2019 3:19 pm
decrypting tetra
Which one?
And you are talk about encrypt Tetra who used by Police and so?
I don't know. Any sample works. I just want to test the plugin

Statistics: Posted by Sadboi — Sun Jul 28, 2019 4:14 pm


Signal Identification Help • Re: Tetra IQ sample that can be decoded?

decrypting tetra
Which one?
And you are talk about encrypt Tetra who used by Police and so?

Statistics: Posted by Username — Sun Jul 28, 2019 3:19 pm


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