Satellite two line element set numbers

I downloaded satellite TLEs from celestrak by using predict. Can someone please explain what the numbers are?

NOAA 15
1 25338U 98030A 17290.95139635 .00000034 00000-0 33298-4 0 9997
2 25338 98.7808 302.1004 0010076 205.3426 154.7261 14.25821139 10248

NOAA 18
1 28654U 05018A 17290.89673189 .00000001 00000-0 25989-4 0 9997
2 28654 99.1748 316.0650 0015300 88.2791 272.0132 14.12353109639486

NOAA 19
1 33591U 09005A 17290.91113331 .00000105 00000-0 82177-4 0 9991
2 33591 99.1087 259.5712 0013065 289.3299 70.6459 14.12220617447715

submitted by /u/Oxffff0000
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FC0012 dongle and Raspberry Pi — Help!

Hi Guys,

I recently began a project of setting up a Raspberry Pi as an RTL SDR server so I bought a RPI and an R820T dongle off ebay.

The R820T that was sent was actually an FC0012...

Now I can't use it for ADS-B like I wanted to but I can use it for airband (Specifically 135.7MHz)

Problem is the FC0012 dongle isn't found by RTL until I install librtlsdr0 with

sudo apt-get install librtlsdr0

but will then give me another error until I remove librtlsdr0 which then somehow allows it to work.

Basically the exact same issue as this

Has anyone had any real success with the FC0012's and a Pi? I'd really prefer to not have to worry about this every boot of the Pi

Thanks

submitted by /u/mtfreestyler
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LimeSDR Mini Updates: Demonstrations with Universal Radio Hacker, LattePanda, PothosSDR and GNU Radio

Over on their CrowdSupply crowdfunding site LimeSDR have been releasing several short tutorials and demonstrations showing their new LimeSDR Mini in action. The latest update shows a short tutorial on using the LimeSDR Mini together with Universal Radio Hacker (URH) to reverse engineer a 433 MHz remote control

Other previous updates include showing how to use the LimeSDR Mini and Wireshark to analyze WiFi signals, using it with a LattePanda mini computer, creating an FM demodulator in PothosSDR and decoding a 433 MHz keyfob in GNU Radio.

The LimeSDR Mini is a smaller and cheaper version of their LimeSDR which has slightly reduced specifications. The main changes are the slightly restricted frequency range of 10 MHz – 3.5 GHz, and half the maximum bandwidth at 30.72 MHz. The mini also only has 1×1 TX/RX channels. 

Recently the LimeSDR was released for crowdfunding on crowdsupply.com and already has raised $165,000 of it’s $100,000 threshold with 12 days remaining. Currently you can back the project for $139 with shipping expected on Dec 31.

LimeSDR Mini Renderings
LimeSDR Mini Renderings

Troubleshooting Help • Re: RTL-SDR Dongle V3 knocking out Wireless Networks

zand wrote:

Well been currently testing it with a 50 ohm terminator. I haven't been using an additional LNA, none of the old TV amplifiers I have are powered and all the homes I can check have never had an TV antenna installed since they where last rebuilt. The usb is dirrectly connected to the motherboard and the system is in a steel 3U case placed in a rack.

Other things that I noted are that after a few hours the signals it picks up go from crystal clear to distorted as if the sample-rate 2400k is set to high and setting it lower dose not fix it but unplugging the dongle and letting it sit for a few minutes dose.

As for it having no means to TX I will agree, if the situation made any sense to me I wouldn't asking about it publicly.


Could you show a screenshot of what happens when the signals go distorted? I've not heard of a problem like that before.

Statistics: Posted by rtlsdrblog — Wed Oct 18, 2017 8:50 am


RTL-SDR Discussion • How to add temperature bar on WXtoIMG

How to add temperature bar on WXtoIMG
So as
.
Image
Cr.johnny.wik

Statistics: Posted by topelectronics — Wed Oct 18, 2017 8:34 am


RSP1 Metal Enclosure Price Reduced to $29.95

Recently we’ve reduced the price of our RSP1 Metal Enclosure upgrade kit from $39.95 down to $29.95 USD. You can purchase the kit from our store. The kit comes with:

  • 1x Metal Enclosure
  • 1x Carry case
  • 1x BCFM Filter with SMA Male to Male Adapter
  • 1x Accessory set including rubber feet, screws, grounding post.

On Amazon USA there are less than 16 units left, and shipped from China from our store there is less than 85. We won’t be restocking this item for a few months so please get in quick if you are interested.

We brought out this kit back in March and instructions for using the kit can be found on this post.

The RSP1 metal case kit
The RSP1 metal case kit

Troubleshooting Help • Re: RTL-SDR Dongle V3 knocking out Wireless Networks

Well been currently testing it with a 50 ohm terminator. I haven't been using an additional LNA, none of the old TV amplifiers I have are powered and all the homes I can check have never had an TV antenna installed since they where last rebuilt. The usb is dirrectly connected to the motherboard and the system is in a steel 3U case placed in a rack.

Other things that I noted are that after a few hours the signals it picks up go from crystal clear to distorted as if the sample-rate 2400k is set to high and setting it lower dose not fix it but unplugging the dongle and letting it sit for a few minutes dose.

As for it having no means to TX I will agree, if the situation made any sense to me I wouldn't asking about it publicly.

Statistics: Posted by zand — Wed Oct 18, 2017 6:07 am


User Projects • Re: RTL SDR RECEIVED NOAA SIGNAL FROM THAILAND

Nice work!

Statistics: Posted by rtlsdrblog — Wed Oct 18, 2017 4:18 am


RTL-SDR Discussion • Re: Adding a Heatsink to The Aluminum Body

k4lmp wrote:

I did this, and it works great. I just used a ty-wrap to hold a heatsink on each side, and put heat sink paste between the RTL-SDR and the heat sink. used it for over an hour, and you could barely feel the heatsink was warm.

On another topic, I like using the AGC, but, when a strong signal transmits, the spectrum display jumps around, and sensitivity is lost for a second or two. It seems to work better on manual. Are there any adjustments I should make to the AGC?


There's no adjustments for the RF AGCs, and i'd recommend leaving them off and just using manual gain.

Statistics: Posted by rtlsdrblog — Wed Oct 18, 2017 4:16 am


Troubleshooting Help • Re: RTL-SDR Dongle V3 knocking out Wireless Networks

zand wrote:

Hate to come back here again. 5 months ago I ruled what was happening with my 2.4Ghz access point to be caused by a firmware bug as even when the AP radio was disabled in the configuration it was still transmitting and handling clients so I replaced it with a different one. During that time I hadn't the time to mess with the SDR unit. During those 5 months I had no problems with my wireless networks accept yesterday and today I started messing with the dongle again on a new system that has no network cards and after a few hours had every system that was connected with the new Access Point lose connection and act up. Even a laptop I have stopped even detecting networks until after a reboot.


I still don't see how the dongle could possibly knock out a wireless network as it has no means to TX at all and doesn't have high EM emissions (it easily passed all CE and FCC unintentional radiator EMC tests). As snn47 said try with a dummy load connected (or at least no antenna) to confirm. Could also be the fault of a bad unshielded USB cable.

Statistics: Posted by rtlsdrblog — Wed Oct 18, 2017 4:14 am


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