Архив за 28.10.2019

User Projects • Halloween Radio


Statistics: Posted by sdrmatlab — Mon Oct 28, 2019 10:36 pm

RTL-SDR Discussion • Outdoor-Box with multiple sticks — some questions


I am a feeder for LiveATC.net already. Now I am planning to build a new outdoor feeder system with multiple sticks attached to a shared dipole antenna:

- 2 RTL SDR sticks (RTL-SDR.com V3 preferred, connected via short USB cable to RPi)
- RPi3
- Metal outdoor case (via thermal pads as heat sink for the RTL SDR sticks and the RPi3)
- short Y-Antenna-cable (two SDR to one shared antenna)
- Airband passband filter (118-136 MHz)
- 5m antenna cable
- LNA at antenna (powered via Bias-T)
- dipole antenna

I have the following questions:
  1. Is it possible to enable Bias-T on both sticks, when connected to the same LNA / dipole antenna via a simple Y-cable? (e.g. during boot it is possible that for a short time one of the sticks will have Bias-T enabled and one disabled)
  2. Which are known good short and shielded USB cables (my cheap ones pick up noise)?
  3. Will it be a problem, if I put the power adapter (switching type) of the RPi inside the outdoor metal case to protect it?
Any advice or experience is appreciated!

Many thanks & happy SDR

Statistics: Posted by thowe — Mon Oct 28, 2019 8:20 pm

KerberosSDR • KerberosSDR Meteor detection Passive Radar

Hi everyone,

I'm new to this technology so apologize in advance for any questions that appear simple.

I would like to setup up a meteor detection / tracking system the same as Tim havens article on rtlsdr.com

Would Tim's method work with KerberosSDR ? I assume 4 Channel Coherent RTL-SDR is better than 1 or 2 RTL - SDR ?

Is there a cheaper alternative to the 6 element yagi antenna with LNA ?

Many thanks


Statistics: Posted by Madar111France — Mon Oct 28, 2019 8:08 pm

I noticed an E4000 was used in the latest Mr Robot episode.

I noticed an E4000 was used in the latest Mr Robot episode. submitted by /u/987djf3498dwesrf
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RTL-SDR Discussion • Re: RTL-SDR HF Mod effecting normal bands?

The V3 already has all the mods to do HF. You just select direct sample i or q.

Statistics: Posted by tim_rtd — Mon Oct 28, 2019 6:39 pm

Comment on L-Band Patch Antenna Set Preorder Sale Ending Soon – Shipping Begins Next Week by Hans

Sent out last Thurday, received today. Initial tests look good. Pity you can’t be curious and peek inside. How do you open that little black box?

SDR Software for MacOS Catalina?


I just bought myself a cheap used MacBook Pro, and I was wondering if theres anything like SDR# for MacOS? I don't know if specific OS version matters, but I'm running the latest version.

Or would I be better off dual-booting Windows or Linux for doing SDR stuff?


submitted by /u/Sir_Garbus
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RTL-SDR Discussion • Re: SDR has clear strong signal, 2 Meter ham rig has bad signal using same antenna

Thanks for the replies! It turned out to be my radio was out of calibration. See, my radio is over 50 years old. it has these little components with screwdriver slots on them. I adjusted the ones that deal with reception. As it turned out, the radio was off by about 5khz. Fixing that fixed my reception as well as moving the antenna outdoors also got me great reception.

Statistics: Posted by KM4OVZ — Mon Oct 28, 2019 3:14 pm

RTL-SDR Discussion • RTL-SDR HF Mod effecting normal bands?

If I do the HF mod to my RTL-SDR V3, will it affect higher frequencies? I know the mod bypasses the tuner and lets signals go directly into the chip, so if I do this mod will it effect normal SDR operations?

Statistics: Posted by KM4OVZ — Mon Oct 28, 2019 3:10 pm

Using a downconverter with an inexpensive SDR to scan for 2.4ghz signals

Hey guys,

For a college project I have decided to make a scanner than scans for wifi signals.

But from a complete lack of knowledge, and a whole 10 minutes of research I have come across SDRs, especially the HackRF One, but it being completely out of budget, I thought of getting an inexpensive one from banggood and using a downconverter to make the 2.44 ghz detectable by the SDR which has a limit of 1.7 ghz.

On the side note, the project is being sponsored by Texas Instruments, was wondering if it's possible for me to make my own SDR using their components.


submitted by /u/Midniteb0n3
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