Архив за 23.09.2019

900 Mhz Cordless Phone With RTLSDR DONGLE

900 Mhz Cordless Phone With RTLSDR DONGLE submitted by /u/Kourosh07
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Comment on Reviews of the Low Cost MLA-30 Wide Band HF Magnetic Loop Antenna by Wilbur

I purchased the MLA-30 the same day OfficialSWLchannel placed his order. Transaction was normal with an ETA but did not receive a tracking #, although it showed up on time, just as advertised. I built it that day and was receiving strong signals that night. It was just what I was looking for for my Realistic DX-440. I have a 60 ft end fed wire antenna and now the MLA-30 also. Much expanded bandwidth coverage from the MLA-30.
I would never spend $300 + on an antenna for my use. If I win the Lottery and invest in serious equipment, then ill be in the market for something larger. I was starting to make plans to build my own Loop, but seriously lack the know how and/or Time. Once I saw this, I figured the hard part is done.
I was surprised at the Mini Coax connections and cables that came with it. I didn’t pay close enough attention to the specs. I need some adapters to kick it up to some standard sized Coax and try that on for size.
I also like the Idea of replacing the thin “loop wire” with some thicker copper. Thats an experiment for another day. Its not for everyone, but it fits my needs and may be a stepping stone to other things.

RTL-SDR Discussion • Progressive Discord Community

Join us in discussion on our Discord server, this group is like no other. Link is in my profile!

Statistics: Posted by adataguru — Mon Sep 23, 2019 9:17 pm


конвертер от NooElec А где прикупить? Ибеи не предлагать, в Крыму не купить на нем.

Voevoda пишет:
конвертер от NooElec А где прикупить? Ибеи не предлагать, в Крыму не купить на нем.
читать полностью...
Широкополосный приёмник из DVB донгла - Страница #575

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да уж, надо было форум перед покупкой читать…. а усилитель вч 20db поднимет сигнал, или больше шумы усилит?

sdl2003 пишет:
да уж, надо было форум перед покупкой читать.... а усилитель вч 20db поднимет сигнал, или больше шумы усилит?
читать полностью...
Широкополосный приёмник из DVB донгла - Страница #575

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Comment on PREORDER SALE: Active L-Band 1525-1637 Inmarsat to Iridium Patch Antenna Set For $34.95 by K2GOG of HVDN

Would be nice if there was a LHCP and RHCP antenna port. For some reason, I am having trouble on the pre-order though….

Troubleshooting Help • Re: Has anyone managed to get a Raspberry Pi 4 working with an RTL SDR?

I'm also trying to use my RTL-SDR dongle with a brand new Raspberry Pi 4 w 4 GB of memory. After driver install, the dongle appears to be working fine, giving the normal output for "rtl_test -t". But after several hours of effort, neither gqrx nor CubicSDR will load and run. gqrx seems to expect a previous version of some dependent file. I tried a simple install of CubicSDR that did not work. I then tried the lengthy laborious manual CubicSDR install from the cjcliff github wiki for Linux. Enough errors accrued during the process that CubicSDR does not install properly and won't run.
I have both gqrx and CubicSDR running with the dongle on a Raspberry Pi 3B+ so did not expect any real issues on Pi 4. Any comments or experience with Pi 4 would be most welcome!

Statistics: Posted by baroquefan — Mon Sep 23, 2019 7:56 pm


Question about NOAA 20

Hi,

Can I receive photos on NOAA 20 like can on NOAA 15, 18, and 19? I am just wondering.

Thanks.

submitted by /u/FIZZY_USA
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Open source tool to decode georeferenced APT data from NOAA satellite

Some time ago I was looking for an open source alternative to wxtoimg to generate georeferenced images from APT wav files. The georeferencing allows one to draw e.g. the coastline and to combine several image once the longitude and latitude of every pixel is known.

As I was curious how this can be done, I wrote a julia package APTDecoder. This is a relatively simply package as the bulk of the work is in the Julia's digital signal processing package and the SatelliteToolbox.jl package. Note that this is just a command-line tool without graphical user-interface. Maybe this is useful for other too.

submitted by /u/RandomizedAlex
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Comment on PREORDER SALE: Active L-Band 1525-1637 Inmarsat to Iridium Patch Antenna Set For $34.95 by sergsero

Signals in the L-band can be very weak or be exposed to Interference from terrestrial sources if the satellite has low elevation angles.

In that regard, it would be interesting to have a L-band antenna that can be placed in the focus of commonly available and cheap offset satellite TV dishes with an f/D of about 0.6 with narrow radiation pattern (beam angle ~6-10 degrees), similar a feed antenna 1.7-2.7 GHZ (WIFI, GSM, 4G, LTE) for parabolic dish which are on a market.

The feed needs a patch antenna with LHCP (left hand circular polarization) so that when installed in a dish the resulting polarization is RHCP, as used by Inmarsat spacecrafts.

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