Архив за 01.09.2018

User Projects • Re: How to assure the lf353n opamp?

So you want an interface that converts a digital signal to a digital signal.....
And you want to use an opamp....
Why?
A simple 2-transistor circuit can do this.
Or do I miss something?

Statistics: Posted by Brightnoise — Sat Sep 01, 2018 9:29 pm


LNB power injector for Blockstream/Bitcoin Satellite (EU)

So I'm trying to setup a receiving end for Blockstream's Satellite that broadcasts Bitcoin's blocks (details found at https://github.com/Blockstream/satellite). I am located in Europe so the satellite is Telstar 11N (EU) with freq: 11504.02 MHz (Pol: Vertical).

From the instructions it seems I will need a LNB and then connect to RTL SDR via a LNB power supply/injector. I found from a shop an LNB that I believe it's compatible: Sharpe BS1K2EL100A https://www.sharpsde.com/products/rf-components/products/BS1K2EL100A but I'm having trouble with the LNB power injector.

Anyone knows if this: https://www.amazon.co.uk/Axing-TZU-15-02-terrestrial-F-connectors-Silver/dp/B002KDU19A will do (assuming cable adapters etc.)? Also, it seems for the US satellite which has Horizontal polarization one person used a DIRECTV 21v Power Inserter SWM ODU and it worked, but it won't do for my case (I assume).

Thank you

submitted by /u/krakrakra
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RTL-SDR Discussion • Re: Tetra radio proximity

This is gonna be a fun project to start

SO to start I'm gonna order my rtl sdr today, then I'm gonna start learning about all the software i need to make it happen

Can you guys give me a recommendation about some of the stuff and software I'll need to make this happen

Kind regards

Statistics: Posted by kingkk7@hotmail.com — Sat Sep 01, 2018 1:01 pm


Troubleshooting Help • Re: LNA help

Yep think of the way that the signal travels. The signal is input from the antenna, gets amplified by the LNA, and then is output to the SDR. Reversing most LNA's shouldn't break it, but better not try just in case.

Statistics: Posted by rtlsdrblog — Sat Sep 01, 2018 9:44 am


Signal Identification Help • Splatter, noise or ? 450.675 MHz

https://teknokoodiradio.vuodatus.net/lu ... 50-675-mhz

Statistics: Posted by rtlsdrdev-user — Sat Sep 01, 2018 7:46 am


Comment on KerberosSDR Preview: A 4x Coherent RTL-SDR for Direction Finding, Passive Radar and more by Marcus Leech

Actually, most RA occurs at VHF and above. The long wavelengths below VHF make high-gain antenna a tad awkward, and the ionosphere is partially opaque even up to 50MHz or so.
Both simple two-antenna interferometry, and beam-forming are things that are of interest to our little enterprise: http://www.ccera.ca

We do have “more exotic” SDR hardware, but if we can do coherence relatively cheaply, it mans we can consider more projects where coherence is a necessity…

-Marcus

Comment on KerberosSDR Preview: A 4x Coherent RTL-SDR for Direction Finding, Passive Radar and more by admin

Sounds interesting. Can you elaborate a little bit on your specific use cases?

I know a lot of RA occurs at HF. The minimum frequency of the R820T2 is 24 MHz, but the calibration board we’ll provide is probably only going to work down to around ~80 – 100 MHz (basically it’s a directional coupler). But for lower frequencies it shouldn’t be too difficult to print a larger calibration board, or increase the noise power with an external noise source. For lower HF frequencies a 4x upconverter running from the same clock might work.

The sample alignment code should also be able to be easily implemented into other code bases.

Подскажите, пжл, правильно ли я понимаю, что RTL-SDR Blog v3 это лучшее, что сейчас можно купить за недорого?

edc пишет:
Подскажите, пжл, правильно ли я понимаю, что RTL-SDR Blog v3 это лучшее, что сейчас можно купить за недорого?
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Comment on bladeRF 2.0 micro: New 47 MHz – 6 GHz, 56 MHz bandwidth, 2×2 MIMO SDR for $480 by Timmy

Sorry wrong FPGA, It is a Spartan 6 XC6SLX150 FPGA (147443 LE’s and 11519 LAB’s) in the B210 vs a Altera Cyclone V FPGA (which is either a 49 kLE or a 301 kLE) in the BladeRF 2.0 Micro.

So depending on the model of BladeRF 2.0 Micro it is either: newer, smaller/bigger, worse/better, lower power, faster, more modern FPGA.

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

It has a Cypress FX3 SuperSpeed USB 3.0 Controller same as an Ettus B210.

It has a Analog Devices AD9361 transcever same as an Ettus B210.

Ok it does not use the Xilinx Spartan 6 XC6SLX75 FPGA that is used in the Ettus B210, it uses a newer, bigger, better, lower power, faster, more modern FPGA. But since that is on the digital side of the board and there is an nice metal can attenuating any EMI entering the transceiver I don’t think it really matters to the actual RF performance.

I would expect the RF performance to be very similar to the Ettus B210, but I am only guessing.

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