Search found 10 matches

by elroy
Tue Oct 24, 2017 3:48 pm
Forum: General
Topic: Another odd signal (or signal-like phenomenon)
Replies: 4
Views: 316

Re: Another odd signal (or signal-like phenomenon)

It's probably a chirp used to measure ionospheric conditions. Google "chirp sounder radio" to learn a bit more about them. As a traditional radio listener you'd just hear a quick squeak as it swept through the pass band. The magic of SDR that you can see these things as well as hear them....
by elroy
Tue Oct 24, 2017 6:58 am
Forum: General
Topic: Another odd signal (or signal-like phenomenon)
Replies: 4
Views: 316

Another odd signal (or signal-like phenomenon)

This evening I was tuned in the area of the international broadcast band around 6 MHz. At one point, I saw what appeared to be a signal moving in frequency from low to high. In the tuning window, it appeared as a ripple moving from left to right across the frequencies. In the waterfall, it appears a...
by elroy
Sun Oct 22, 2017 3:54 pm
Forum: General
Topic: Guidelines on posting screen grabs?
Replies: 2
Views: 218

Re: Guidelines on posting screen grabs?

Thanks. I went ahead and posted a message with some screenshots hosted on an external site similar to Imgur, and it worked out fine.
by elroy
Sat Oct 21, 2017 8:11 pm
Forum: General
Topic: Odd signals and other unusual patterns
Replies: 9
Views: 444

Re: Odd signals and other unusual patterns

That pattern of spikes looks like the type of buzz I get from a nearby plasma TV. If you listen in AM you may hear a sharp buzzing sound. Hmm, a large plasma TV was probably in use about 25 feet/7 meters away at the time. I'll have to conduct further tests with the TV on and off. Thanks for the help.
by elroy
Sat Oct 21, 2017 8:09 pm
Forum: General
Topic: Odd signals and other unusual patterns
Replies: 9
Views: 444

Re: Odd signals and other unusual patterns

DanubeBCL wrote:Do a search on the term "CODAR".

Yes, that definitely looks like what it is. It also appears that radars of this type are in use in my area. Thanks for the help!
by elroy
Sat Oct 21, 2017 3:17 am
Forum: General
Topic: Odd signals and other unusual patterns
Replies: 9
Views: 444

Re: Odd signals and other unusual patterns

Mark (or others), is there any information (or perhaps speculation) on what these "cascading frequency" stations are?
by elroy
Sat Oct 21, 2017 12:55 am
Forum: General
Topic: Odd signals and other unusual patterns
Replies: 9
Views: 444

Re: Odd signals and other unusual patterns

Here's another odd pattern. Basically spikes all up and down the tuning range, all dancing up and down in unison. As I tune across them I think I can faintly hear what sounds like commercial broadcasting. Is this a commonly seen manifestation of commercial AM interference? https://s1.postimg.org/82y...
by elroy
Sat Oct 21, 2017 12:44 am
Forum: General
Topic: Odd signals and other unusual patterns
Replies: 9
Views: 444

Re: Odd signals and other unusual patterns

Thanks very much for the explanation of the DC offset. Is the other image posted above (of the "cascading frequency" station) a signal type that people commonly run into? Also, in the image below there are two "humps" of background noise on the left and right sides of the frequen...
by elroy
Fri Oct 20, 2017 6:24 pm
Forum: General
Topic: Odd signals and other unusual patterns
Replies: 9
Views: 444

Odd signals and other unusual patterns

I've been using my RSP2 with SDRUno for a while now, and have run across a few odd patterns in the frequency display. Some I strongly suspect are actual signals of certain kinds of transmissions I'm not familiar with. Others I think are probably something going on inside SDRplay itself. I'll look ar...
by elroy
Fri Oct 20, 2017 3:57 am
Forum: General
Topic: Guidelines on posting screen grabs?
Replies: 2
Views: 218

Guidelines on posting screen grabs?

I have some questions I'd like to post about some of the signals I'm seeing in SDRUno with an RSP2, and it would probably be helpful if I posted a screen grab to show what I'm seeing. What is the best way to do this? As a file attachment? Or is there a way to include an embedded image in a message? ...

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