r/RTLSDR

Hi i have the nooelec sdr with the stock antenna. I want to upgrade the antenna as dont seem to get much from them.

Whats a cheap upgrade, something internal but also something i can put out the window as well.

I would like ti track ships that go past in the channel, (no idea if i can do that) also amature bands and airband if possible

Thanks for help

Hi everyone,

I’m part of an independent technical initiative called Spectrum Survey. We are currently documenting how the increasing urban noise (LTE/5G) and the South Atlantic Anomaly (SAA) are impacting L-Band signal integrity in the Southern Hemisphere.

As we know, traditional filtering often fails under high saturation in dense urban areas, and we are trying to map these critical points to validate better mitigation methods and promote SigMF standardization for SDR.

If you deal with RF, Satcom, or GNSS, I’d love to get your input through our research form. It takes about 3 minutes and it’s purely technical (discovery-focused, not sales).

Check it out here:spectrumsurvey.org

We’ll be sharing the consolidated report with everyone who contributes. Happy to discuss any specific findings or SAA interference patterns in the comments!

I just got the RTL-SDR Blog V4, and I've got it working, but it's not performing quite as I expected. So, my primary SW radio receiver is a XHDATA D-808, which I use to listen to amateur radio bands using a GA800 loop antenna. I also use a lot of WebSDRs that I use alongside my D-808. I thought I'd have a go at setting up an SDR for my own use, so I bought the RTL-SDR Blog V4.

Setup was smooth, got the thing working with no problems, but I have a few issues with sound quality and so on. So, initially I tested it by trying out the local FM radio broadcasts, and it received them, but they were very crackly/hissy. I tried adjusting the bandwidth from 50,000 to 100,000+ and the hissing cleared.

I then tried to tune in to the airband frequencies for my local airport. I can receive them, but as soon as someone starts speaking to the tower, or vice versa, everything mutes and all I can hear is something that sounds like someone trying to talk underwater with a mouthful of cotton wool, and I cannot make out what's being said.

The final problem is that I cannot receive anything on any of the amateur radio bands.

Can anyone help?

Got the sdr touch app to work with my phone and an otg cable. Experimenting with ads-b radar too.

Anyone ever get their phone to charge while using the dongle or some different otg cable setup?

I'd like to figure out battery longevity before I buy a key. Other than disconnecting intermittently to charge up.

Since the end of March, I have received no FLEX ambulance data whatsoever on 153.350 which was the busiest frequency. I am receiving some sparodic FLEX on 153.025 so I know the decoding is still working if there is a Flex signal to work with.
Is there anyone able to tell me if they are still receiving ambulance pager data on 153.350, or has it now ceased broadcasting.

I finally bought my first RTL-SDR V2 (FC0013) from AliExpress

Hi,

With regard to Receivers on the RTL-SDR being used at 915MHz, I am aware that de-sensing of the receiver can become a regular occurrence especially when the RTL-SDR is used close to 5G/LTE Cell Towers in the USA. The RTL-SDR receiver has a very wide rf front-end and it is relatively easy for unwanted 5G/LTE signals to overdrive the Receiver LNA into compression such that gain drops,unwanted intermods and harmonics are generated and the receiver sensitivity at 915MHz can reduce dramatically. This means that important receive data does not get received by the RTL-SDR due to unwanted very large signal level blocking.

I have developed a 915MHz saw filter pcba,size 10mm by 12mm and 1.2mm high and the board includes the rf connectors (u.fl).This filter board works perfect up to a receiver input level of +10dbm with a zero-drift reliability.The performance of the rf bandpass filter with regard to In-Band Insertion Loss and Out-of-Band Rejection is exceptional.This filter will safely attenuate the 5G/LTE bands just below and above 915MHz such that the LNA never becomes overloaded so the important receive data always gets received correctly.This filter provides excellent rejection from 100MHz through to 6.1GHz such that all unwanted blocking signals at the input of the Receiver Antenna terminal are greatly attenuated.

If you are interested, I can provide photos of the pcba and VNA plots of the filter performance close in at 915MHz and also wider band over the range (100MHz-6.1GHz). I can also provide S2P files across the two bands mentioned such that you can look at the performance of the filter in RF Design Software such as ADS,Microwave Office or free software such as RFSIM99 or ATYUNE.

The main target of this rf bandpass filter was to provide a solution to Unwanted Receiver Blocking problems as a re-fit to the RTL-SDR.The pcba weighs less than 1 gram (it was too light for my electronics scale to measure a value,just showed 0.00 grams!!!) and can easily fit inside most sort of enclosures including the RTL-SDR enclosure.

https://preview.redd.it/4o2y5lc4pewg1.png?width=1920&format=png&auto=webp&s=3ff7ab31922d9fd1f7d7ac56910ad8b3bc23651c

https://preview.redd.it/04yh8at7pewg1.png?width=1918&format=png&auto=webp&s=b0d0e668e1ae2784a7d7e39514ff529c33c5bb0c

it doesnt sound like anything

From off, on and back off the Sun. VE4MA feed, Demi LNA, RSP1A SDRplay

#radiotelescope #radioastronomy #SDR

For example, I can hear a radio station at 98.2 MHz but then I hear that same station at varying qualities across multiple frequencies up to 99.6 MHz

I’m using SDR++ with Fldigi for digital decoding, and without for voice. Is there a way to configure a virtual cable for Fldigi while simultaneously outputting to headphones?