Архив за 01.09.2017

Does Meteor M2 Wx Sat Have Channels Down?

The past 2 days I haven't been able to get anything on Channels 1 and 2. Only the infrared on Channel 5 is coming in. It's not my signal since its coming in 20dBm over noise floor. http://imgur.com/a/4sfED

When I run it through LRPT Decoder Channels 1 and 2 are black. I'm assuming some sensors are down. Does anyone know anything?

submitted by /u/jwoft
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Antennas • Re: Basic Questions About Antenna Set-Up for Shortwave

Hi snn47,

Thanks for your detailed reply.

A wire sounds like a good starting point then. Were you thinking about something like this? http://www.amateurradio.bz/images/quart ... rtical.gif

Statistics: Posted by BigJim — Fri Sep 01, 2017 4:34 pm

Comment on RTL-SDR Tutorial: Analyzing GSM with Airprobe/GR-GSM and Wireshark by JESUS TOUCH

It is until we get some divine ideas that we are able to achieve great things that we could not imagine. I surely found this as an informative and interesting post.

Hi, any of you , make de device works…

Hi, any of you , make de device works with android.works fine with microsof and linux . Thanks

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Upgrade Belling Lee to SMA?


I'm using belling Lee connectors to connect my home made QHF antenna to the dongle (with an adapter from Belling Lee to MCX). The cable I'm using is RG6 coax.

Would it be worth it to upgrade the belling Lee connectors to sma connectors? I'm mainly using my rtl SDR for satellite reception.

submitted by /u/dev_arved
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Comment on dopplerscript: Getting Doppler Updates from GPredict into GNU Radio by Gio

I tried the same thing using XMLRPC, for which I did not need to create an OOT module for gnuradio. However, when running my script on a raspberry pi, it would crash as soon as the update rate was faster than 1s. No clue why, on my laptop it would run faster. Does this run on a rPi?
Check out my script on github, it’ll download the TLEs for weather satellites, find meteor M2 in there, calculate position (using pyephem) and launch a grc script when elevations are positive, followed by automatic decoding, image processing and distribution to a mailing list.

Вот принял вчера 61 гр выкса 20.40…

Вот принял вчера 61 гр выкса 20.40

Утренний пролёт спутника NOAA 18 01.09.2017…

Утренний пролёт спутника NOAA 18 01.09.2017

Comment on Tracking Wildlife with TDOA Direction Finding and RTL-SDR Dongles by andrej

hmmm sound good but how to deploy such an System in an Mountain Area where reflection could happen?

(Almost) Receiving HRPT with the ADALM-PLUTO and a WiFi Grid Antenna

Over on YouTube user Tysonpower has uploaded a video showing how he was (almost) able to receive the HRPT signal from NOAA18 with an ADALM-PLUTO, LNA4ALL and a WiFi grid antenna.

Most readers will be familiar with the low resolution 137 MHz APT weather satellite images transmitted by the NOAA weather satellites. But NOAA 15, 18, 19 and well as Metop-A and Feng Yun satellites also transmit an HRPT (High Resolution Picture Transmission) signal up in the 1.7 GHz region. These HRPT images are much nicer to look at with a high 1.1 km resolution. If you follow @usa_satcom on Twitter you can see some HRPT images that he uploads every now and then.

However HRPT is quite difficult to receive and decode because the bandwidth is about 3 MHz so something with more bandwidth than an RTL-SDR is required. The signal also needs a ~1 meter or larger dish antenna as it is very weak, and you also need a motorized pointing system to track the satellite with the dish as it passes over.

Despite the difficulty in his video Tysonpower showed that he was able to at least receive a weak signal using a non-optimal 2.4 GHz WiFi grid dish antenna, LNA4ALL and his ADALM-PLUTO. The signal is far too weak to actually decode, but it’s still pretty surprising to receive it at all. In the future Tysonpower hopes to be able to improve his system and actually get some image decodes going. Note that the video is in German, but there are English subtitles available.

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