Архив за 03.06.2019

RTL-SDR Discussion • Re: Using SDR and computer to send data over internet

Which RTK setup the Trimble???

These use the ISM 902-928Mhz band. in the US.

How is the "BASE UNIT" mounted.

To achieve 12Miles on 900Mhz is most certainly possible, BUT NOT FROM THE unit mounted on the tripod in a field or something.

To achieve that 12M operation. It will need to be mounted ABOVE THE GROUND CLUTTER of the area, trees, buildings.


I would suggest that you look into improving the location of the base, ie: higher mount on a tower for one.

Other options are things like repeaters, that Trimble offers.

Review:
https://support.agleader.com/kbp/index. ... tachID=766

Starting at page 58.

Statistics: Posted by Flexme — Mon Jun 03, 2019 11:09 pm


RTL-SDR Discussion • Re: Raspberry PI, SDR and ICECAST

What is it you are after in this:

First, what do you want to receive?

Second, is this a LOCAL IceCast server or a REMOTE ONE AT VPS server in a DC???

There are many ways to feed SDR to an IceCast stream depending on what you are after..

P25 Phase I & II are doable depending on your needs.. Right now if you need PII you are pretty much stuck with OP25.

I use rtl_fm and feed it to ezstream to send to my IceCast Server.

I've got more Pi's doing OP25 to IceCast

I've got another Pi doing Darkice taking LINE AUDIO IN from Wolfson card... and in the past used a Pi with an cheapo USB donlge to take analog audio in, and send to darkice to IceCast.. The SDR/ezstream setup replaced that.

Outline what you want to do, and I will advise further.

Statistics: Posted by Flexme — Mon Jun 03, 2019 10:50 pm


RTL-SDR Discussion • Re: Raspberry PI, SDR and ICECAST

What is it you are after in this:

First, what do you want to receive?

Second, is this a LOCAL IceCast server or a REMOTE ONE AT VPS server in a DC???

There are many ways to feed SDR to an IceCast stream depending on what you are after..

P25 Phase I & II are doable depending on your needs.. Right now if you need PII you are pretty much stuck with OP25.

I use rtl_fm and feed it to ezstream to send to my IceCast Server.

I've got more Pi's doing OP25 to IceCast

I've got another Pi doing Darkice taking LINE AUDIO IN from Wolfson card... and in the past used a Pi with an cheapo USB donlge to take analog audio in, and send to darkice to IceCast.. The SDR/ezstream setup replaced that.

Outline what you want to do, and I will advise further.

Statistics: Posted by Flexme — Mon Jun 03, 2019 10:47 pm


First, thanks for adding me. Second, «new to the RTL-SDR dongles» question: I was told it was…

First, thanks for adding me. Second, "new to the RTL-SDR dongles" question: I was told it was possible to setup SDR# to act just like a dedicated scanner would and I'm not figuring out how. What I want is to setup, say, 8 UHF analog frequencies, have the dongle software repeatedly sample just those frequencies and stop on any active ones. IOW, just like a "scanner". I found in Freq. Manager where you can enter and name a list of frequencies, but I'm not understanding how ...to initiate any actual 'scanning' process. I've checked messages here for clues and haven't found what I'm looking for as an answer. Is this even possible with SDR#, add-in's or other software? Thanks

(Feed generated with FetchRSS)

RTL-SDR Discussion • Re: ExtIO_RTLSDR# — custom ExtIO for RTLSDR

alanzfq wrote:
Sun Jun 02, 2019 4:15 pm
I suggest you try HDSDR v2.80.
Then report if it still has a problem.
Alan
I dont like some future`s from 2.80.
2.76 is a stable version.

Statistics: Posted by 19ac728 — Mon Jun 03, 2019 8:00 pm


RTL-SDR Discussion • Re: ExtIO_RTLSDR# — custom ExtIO for RTLSDR

The problem is solved.

Can I also request an extra option?
You could also make the bias-t in it?

regards, Michiel

Statistics: Posted by 19ac728 — Mon Jun 03, 2019 7:58 pm


Need help decoding a signal — 2.4 ghz wireless mobile presenter

Need help decoding a signal - 2.4 ghz wireless mobile presenter

I'm playing with a wireless mobile presenter and it does accept replaying the signal. Since the USB dongle is recognized as a HID on Linux, it may be possible to inject keystrokes.
I know that there is the mousejack project based on nrf24, but I was unable to decode the signal using the nrf24 decoder.
What I know about the signal:

https://i.redd.it/xr1lar1bg5231.png

It has some type of TDMA since there is a repeated pattern on time.
Bandwidth may be 1 Mhz since I used a low pass filter and signal it's accepted by the receiver.
Mobile presenter transceiver has no information or fccid on it.

I recorded a sample with HackRF and uploaded it. It was recorded on 2.4ghz spectrum with a samp rate of 20Mhz : https://we.tl/t-jJSBb4FPGr

submitted by /u/zezadas
[link] [comments]

Trying to receive the hydrogen spin-flip emission at 1420 MHz. Wondering if this is the signal.

I'm doing an radio astronomy project for school. I built a horn antenna, I'm using the Airspy dongle, two LNA4ALLs, and a 1400-1750 MHz bandpass filter. My goal was to receive the hydrogen 21 cm emission line at 1420.4 MHz while pointing my horn antenna at the milky way. Airspy has a handy little program called Astrospy which I used to get this image: https://imgur.com/30E79AO You can also see a little bump at 1420.5 and after the spike at 1420 MHz the signal starts to climb. I don't know what to make of those.

But as you can see the peak shows up at 1422 MHz. I pulled up SDR# and saw the same peak at 1422 MHz. When I swept my antenna around the sky the spike faded in and out as I passed over the plane of the milky way so I'm fairly confident that it is the indeed the signal I'm looking for just offset by ~1.6 MHz due to the hardware. But I don't want to just assume this.

I thought it could be a fictitious signal so I swapped out the Airspy for the RTL_SDR V3 dongle and got the same signal and reaction when the antenna was swept across the sky, which I think is a good sign.

Here is the wave file I recorded of when I was pointing the antenna in different directions: https://drive.google.com/open?id=1Gnyt37yImNG1SIeFCWsx4-GAd89gwg22

What do you think?

submitted by /u/KKRJ
[link] [comments]

Troubleshooting Help • Re: Need help with SDR sharp

or on the Desktop, Download Subfolder,... USB Drive if you want to...

Statistics: Posted by Username — Mon Jun 03, 2019 3:39 pm


Troubleshooting Help • Re: Need help with SDR sharp

Username wrote:
Sun Jun 02, 2019 8:52 am
Does anything elese work?
You can exctract the Data on any pc and copy them via an USB Dongle to your Pc.

The good thing is there is no "real" installation needed.
You mean I can just copy the folder in c/programs files/ or wherever it is installed and paste it in my hard drive?

Statistics: Posted by BSJR — Mon Jun 03, 2019 3:26 pm


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