Архив за 23.11.2018

Troubleshooting Help • problem with bias tee

Hello, i have a rtl-sdr v3 usb dongle (batch NSY 2018 8)

I have the RTL-SDR blog LNA too.

When i connect the dongle to the usb slot, it suddenly turn on the bias tee and i see the green light inside of the LNA (without using the batch file).
Even if i use bias_tee_off.bat, i see the writing "Found Rafael Micro 820T Tuner", but the green light stays on and the LNA continues to operate.

Even if i manually write the command in the cmd

rtl_biast off -b 0

i see the writing "Found Rafael 820T", but the green light stays on and the LNA continues to operate.

Even if i disconnect then reconnect the usb dongle the green light stays on and the LNA continues to operate.

A friend of mine have the same dongle and the same LNA and his dongle turns on the bias tee only if he launches the batch file, as it should be.

How could i resolve this problem?
Thank you very much.

Statistics: Posted by Jekko — Fri Nov 23, 2018 10:46 pm


Off-Topic • Re: More fake units sold on Ebay

I buy just the original no elec.

Statistics: Posted by Username — Fri Nov 23, 2018 10:03 pm


Off-Topic • Just boring stuff above 868?

Beside of 1090Mhz its quite boring above 868 Mhz. What is see in the Paper just Radar, Mil Freq and other.

Statistics: Posted by Username — Fri Nov 23, 2018 10:00 pm


Comment on SDR Touch brings RTL-SDR to Android by Viktoras

On the smartphone Huawei p20, Android 8.1 does not work gestures, only the upper part moves, I change frequency only with the “jump” button. On others my phones all ok

Antennas • New Spiral Antenna

Image

Hi all, Hopefully Rtlsdr wont mind me posting here with an antenna i'm selling on Tindie. In mitigation I have tried hard to provide really good documentation on how it was designed and the decisions that went into it. Hopefully readers will find this educational. The antenna was simulated using open source software(OpenEMS) which I encourage people to try out.

The antenna was designed specifically to support SDR users who want to be able to receive a really wide variety of signals with a single 'jack-of-all-trades' antenna. The large antenna covers 300MHz+ and also works pretty well for fm broadcast bands(more by accident than design if i'm honest). It has circular polarisation so will receive both horizontal and vertical polarised signals without needing to worry. It also has suction mounts so you can easily mount it to a window(ideal if you are not able to put up an external antenna).

http://hexandflex.com/2018/09/29/spiral-antenna-part-1 - Blog discussing design choices.

http://hexandflex.com/2018/10/05/spiral ... th-openems Using Open Source software to simulate the design.

http://hexandflex.com/2018/11/11/spiral ... nd-suckers Results and measurements

Statistics: Posted by HighSNR — Fri Nov 23, 2018 8:09 pm


Does it work a ground plane antenna for Receiving NOAA images?

submitted by /u/makutene
[link] [comments]

RTL-SDR Discussion • Re: need help about RTL2832U

Didn't get you.

Statistics: Posted by nilkanthagholap — Fri Nov 23, 2018 2:56 pm


Is this aliexpress store legit or just an other fraud?

submitted by /u/Dr_Defimus
[link] [comments]

Comment on Es’hail-2: First Geostationary Satellite with Amateur Radio Transponders Successfully Deployed by Dave, G8GKQ

Some clarifications to the article above:
– Es’hail-2 will be positioned at 26 degrees East, not 25.5 degrees where Es’hail-1 is located.
– The use of DVB-T in the wideband transponder is unlikely to be practical. The recommended modes are DVB-S2 and DVB-S, especially the amateur-developed Reduced-Bandwidth TV variants that can carry an HDTV picture in 500 KHz of bandwidth.

Avtomatizator, KarapuZ Спасибо. RBW помогло, как-то я его упустил из вида. Покрутил яркость + контраст + скорость, читаб…

DVE пишет:
Avtomatizator, KarapuZ Спасибо. RBW помогло, как-то я его упустил из вида. Покрутил яркость + контраст + скорость, читабельность стала заметно лучше. Было/стало, на NDB-маяках разница заметна: Увели...
читать полностью...
Широкополосный приёмник из DVB донгла - Страница #556

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