Архив за 01.10.2018

Comment on SDR# TETRA Plugin Updated: No longer requires MSYS2 by GPT

I olso get a error when starting the Demodulator, SDRSharp shuts off.
Anyone have an idea why?

Tia.

Antennas • Re: Antenna combiner

Combining different frequency ranges is possible, but requires that the filters provide separation between the antennas in frequency,

This requires the cutover frequency ranges of filters and antennas don’t overlapp. If you combine the same signal received by different antennas, due to varying phases they mostly will cancel each other.

For your antennas, a combiner would need to consist of a LP-filter for AM, a BP filter for your HF antenna, another BP for the FM antenna and a HP filter for the GHz antenna. The combiner you’ve shown seems to be for BC/TV use and therefore will not work for you. Due to the high attenuation I would suggest to use a mechanical antenna switch,

Statistics: Posted by snn47 — Mon Oct 01, 2018 9:52 pm


RTL-SDR Discussion • Cubic on a Mac ro ‘listen ‘ to RTL-SDR stream for Raspberry Pi?

Hi

I have an RTL-SDR USB on a RaspPi.

Can receive it on Windows using SDR# or via port 1234 Tcp stream using the iPhone app SDR Receiver,

Just wondering what settings to use on Cubic SDR on a mac.

I have tried to add it manually using various of the Remote settings on Cubic SDR app on the Mac, but it always just says 'not found'

Anyone give me a clue what to do..the only Cubic SDR guides seem to show how to do it with the USB device connected locally

Cheers

Statistics: Posted by NeilP — Mon Oct 01, 2018 7:54 pm


Comment on 30% Off Outernet L-Band RTL-SDR DIY Kits – $70 for RTL-SDR, LNA, Antenna, CHIP and Battery by Darwin

How can I buy this kit?

LNA’s for LRPT

Does using a LNA for LRPT reception make sense? Or is it futile? For me it's a 1/3 chance if the recording works out. Would it make it a bit more reliable?

Cheers!

submitted by /u/homo_terrestris
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Doubt Regarding RTL SDR Sampling frequency and Bandwidth for 21 cm Radio Observation

I am trying to build a radio horn antenna as previously done by this guy: http://rishi-patel.blogspot.com/2013/

He has said in his blog that he used a micostrip filter of 200 MHz bandwidth centred around 1400 MHz. But the RTL-SDR Dongle he used for his project was clearly NooElec R820T whose sampling rate is very much lesser than the bandwidth of the bandpass filter(2.4 MHz). How does this work? I'm very new to this , so please explain.

submitted by /u/Pranavwalker
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Radiogubitel радиатор от пентиума Чего не батарея отопления? 40-50 градусов, чип не убьют точно, имхо свисток не разогре…

Ruiz_Av пишет:
Radiogubitel радиатор от пентиума Чего не батарея отопления? 40-50 градусов, чип не убьют точно, имхо свисток не разогревается и до таких температур. Вероятнее убить его статикой от самопальных, ди...
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Широкополосный приёмник из DVB донгла - Страница #555

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Using an RTL-SDR to decode VOR Aircraft Navigation Beacons in Real Time

VOR stands for VHF Omnidirectional Range and is a way to help aircraft navigate by using fixed ground based beacons. The beacons are specially designed in such a way that the aircraft can use the beacon to determine a bearing towards the VOR transmitter. VOR beacons are found between 108 MHz and 117.95 MHz, and it's possible to view the raw signal in SDR#.

Over on RadioJitter author Arnav Mukhopadhyay has uploaded a post describing how to decode VOR into a bearing in real time using an RTL-SDR dongle. His post first explains how VOR works, and then goes on to show an experimental set up that he's created using a GNU Radio program.  With the software he was able to decode an accurate bearing towards the VOR transmitter at a nearby airport.

Arnavs post is a preview of an academic paper that he's worked on, and the full paper and code is available by request on the radiojitter post. We've also seen on YouTube that Arnav has uploaded a video showing the software working in action, and we have embedded it below.

Bearing to nearby airport VOR transmitter determined with an RTL-SDR and GNU Radio.
Bearing to nearby airport VOR transmitter determined with an RTL-SDR and GNU Radio.

Real Time Demo of VOR Bearing

Comment on More KerberosSDR Passive Radar Demos by Seasalt

On a boat at sea. I could put 4 omni-directional antennas at EXACT KNOWN positions.

One at front.
One at back
One on left side.
One on right.

Mathematically it would appear possible to hear the source signal say a TV or radio signal on all 4 antennas at minutely different time due to the antennas being at different distances from the source signal.

It should also be possible to hear the known signals reflections from say another metal ship at sea at different time on all four antennas.

Can the KerberosSDR software and Hardware calculate this as a passive radar equation and plot the detected ships position?

Reverse Engineering Wireless Blinds with an RTL-SDR and Controlling them with Amazon Alexa

Amazon Alexa is a smart speaker that can be programmed to control home automation devices via voice commands. For example, Stuart Hinson wanted to be able to control his wirelessly controlled blinds simply by verbally asking Alexa to close or open them. Stuart's blinds could already be controlled via a 433 MHz remote control, so he decided to replicate the control signals on an ESP8266 with 433 MHz transmitter, and interface that with Alexa. The ESP8266 is a cheap and small WiFi capable microchip which many people are using to create IoT devices.

Fortunately replicating the signal was quite easily as all he had to do was record the signal from the remote control with his RTL-SDR, and use the Universal Radio Hacker software to determine the binary bit string and modulation details. Once he had these details, he was able to program the ESP8266 to replicate the signal and transmit it via the 433 MHz transmitter. The remaining steps were all related to setting up an HTTP interface that Alexa could interface with.

If you're interested, we've also previously posted about another Alexa + RTL-SDR mashup which allows Alexa to read out ADS-B information about aircraft flying in your vicinity.

[First seen on Hackaday]

The ESP8266 with 433 MHz Transmitter
The ESP8266 with 433 MHz Transmitter
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