Архив за Август, 2018

РАДИОБЛОГ с Александром НикитенкоПроверка работы конвертера от ExpElectroLAB для…

Конвертер для приёма КВ на SDR приёмник и фильтр помехоподавляющий.

Конвертер для приёма КВ на SDR приёмник и фильтр помехоподавляющий. (00:16:31)

РАДИОБЛОГ с Александром Никитенко
Проверка работы конвертера от ExpElectroLAB для приёма КВ на СДР свисток (DVB-T тюнер) + небольшой обзор помехоподавляющего фильтра.

Comment on Transmitting and Receiving DATV with a LimeSDR and a Modified $20 DVB-S Receiver by Doc Oct

There are so many misconceptions to your post. For one, he’s clearly a Ham radio operator and has clearance to do this. Even if he wasn’t, the FCC isn’t going to send a special forces team to kick his face in. You need to watch less movies. They would investigate it and then send him a letter warning him to knock it off. If he persisted then they would visit him in person. If he still persisted then they would drop a big fine on him and confiscate all of his radio equipment, even the legal stuff. These enforcement actions are much more boring than what you’ve dreamed up in your imagination.

RTL-SDR Discussion • Re: Tetra radio proximity

I hope not to be too off topic, :) but I have more than one Uniden scanner, and noticed that the Close Call RF Capture technology of the UBC125XLT (European version of the BC125AT) detecs TETRA emissions while some other Unidens never "capture" them...
I often use it as a "TETRA detector" when I'm out and about. :D
A TETRA Close Call Hit sounds like a loud buzz, an alert by itself, yet its buzz can be confused with a DMR Close Call Hit.
The captured freqs usually correspond to one of the sides of the channel, so to speak, but the central freq is easily found once at home just looking at the spectrum analyzer on PC...
I have no experience about the Spectrum Sweeper technology of the Whistler scanners, though.

Statistics: Posted by Valeriy — Fri Aug 31, 2018 4:44 pm

Comment on bladeRF 2.0 micro: New 47 MHz – 6 GHz, 56 MHz bandwidth, 2×2 MIMO SDR for $480 by Tetra

and how many ghost images und spurii. how they handle the usb 3.0 noise issues ?

Comment on bladeRF 2.0 micro: New 47 MHz – 6 GHz, 56 MHz bandwidth, 2×2 MIMO SDR for $480 by Robert

It would be nice to know what the number is for the noise floor is of the device ???????????????????????

Troubleshooting Help • Re: LNA help

Perfect. Thank you so much for your help!

Statistics: Posted by Reg_C — Fri Aug 31, 2018 1:02 pm

RTL-SDR Discussion • Re: RTL-SDR V3 Range Works

A disk cone antenna works good also , just make sure you get one that has a " N " connector on it .

Statistics: Posted by P-40 Warhawk — Fri Aug 31, 2018 11:56 am

bladeRF 2.0 micro: New 47 MHz – 6 GHz, 56 MHz bandwidth, 2×2 MIMO SDR for $480

Nuand have recently released their new bladeRF 2.0 micro software defined radio. The SDR has a frequency range of 47 MHz to 6 GHz on TX and 70 MHz to 6 GHz on RX, a bandwidth of up to 56 MHz, a 12-bit ADC and has 2 RX and 2 TX radios.

There are two options for sale, the US$480 xA4 version and the US$720 xA9 version. The differences between the two appear to be entirely in the FPGA, with the more expensive version having an FPGA that contains many more logic elements which means that more DSP hardware can be synthesized on it. The RF transceiver chip used is the AD9361, which is the chip used on most high end SDRs like USRP's.

The bladeRF 2.0 micro is the next-generation 2x2 MIMO, 47MHz to 6GHz frequency range, off-the-shelf USB 3.0 Software Defined Radio (SDR) that is easy and affordable for students and RF enthusiasts to explore wireless communications, yet provides a powerful waveform development platform expected by industry professionals.

Support is available for Linux, macOS, and Windows. The bladeRF libraries, utilities, firmware, and platform HDL are released under open source licenses, and schematics are available online. The FPGA and USB 3.0 peripheral controller are programmable using vendor-supplied tools and SDKs that are available online, free of charge.

The bladeRF 2.0 micro features support for: GNU Radio via gr-osmosdr, Pothos via SoapySDR, SDRange, SDR Console, SDR # via sdrsharp-bladeRF, YateBTS, OpenAirInterface, srsUE & srsLTE, MathWorks MATLAB® & Simulink® via libbladeRF bindings.

The bladeRF 2.0 micro
The bladeRF 2.0 micro

Any Cubesats sending out Images?

Ive heard about some Cubesats sending out images. Is this true?

submitted by /u/WarGamerJustice
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NooElec SAWBird: An LNA + Filter for GOES Weather Satellite Reception Now Available

NooElec has just released their new "SAWbird" GOES LNA for sale. This is an LNA and filter combination designed to help receive GOES weather satellite images. On the PCB is a 1688 MHz SAW filter and a low noise amplifier. It can be powered with 3V - 5.5V connected directly or via bias tee. The SAWbird is currently available on Amazon and their store for US$34.95. They also have a version for Inmarsat and Iridium, so make sure you choose the correct one.

GOES 15/16/17 are geosynchronous weather satellites that beam high resolution weather  images and data. In particular they send beautiful 'full disk' images which show one side of the entire earth. As GOES satellites are in a geosynchronous orbit, the satellite is in the same position in the sky all the time, so no tracking hardware is required and images can be constantly pulled down throughout the day without having to wait for a satellite to pass over. 

However, compared to the more familiar and easier to receive low earth orbit satellites such as NOAA APT and Meteor M2 LRPT, geosynchronous satellites like GOES are quite a bit further away, and transmit at 1.7 GHz. So to receive the signal you'll need a dish antenna that you can accurately point, a good low noise figure LNA and possibly a filter. So setting up a receiver is a bit more difficult when compared to receivers for NOAA and Meteor satellites. The SAWbird should help however, by providing a ready to use LNA+Filter combination.

Over the past few months several testers have already received engineering samples of the SAWbird and have been successful at receiving GOES images. From the results of several experimenters, it appears to be possible to use a cheap 2.4 GHz WiFi grid antenna with some minor modifications as a GOES satellite antenna. Get one with at least a one meter long width and bend the feed as described here or here to tune reception for the 1.7 GHz GOES frequency. Pieter Noordhuis has also shown that it's possible to use an RTL-SDR to receive GOES images, so an entire GOES system can be built on a budget.

NooElec SAWbird LNA + Filter for GOES reception.
NooElec SAWbird LNA + Filter for GOES reception.
GOES Full Disk Image of the Earth
GOES Full Disk Image of the Earth
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