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Comment on TETRA Decoder Plugin for SDR# Now Available by marti

hi, when the audio comes out as a robot to call it in some way is because the communication is encrypted?

Comment on Airspy HF+ Discovery Now Available for Preorder + Brief Initial Review by Bjarne Mjelde

You have free DAB+ decoders to be used with SDRs. But one DAB multiplex is around 1500 kHz wide, while the HF+ can only sample 660 kHz alias-free.

Comment on Airspy HF+ Discovery Now Available for Preorder + Brief Initial Review by Timmy

So should the price of the hardware be increased higher for everyone to pay the additional royalties on every device sold to the Via Licensing Corporation or else do some kind of oddball weirdness like the Raspberry Pi does ( http://www.raspberrypi.com/license-keys/ ) with the MPEG LA organisation ?

The reality is that DAB+ is an open standard that unfortunately uses some licensed codecs. And the patent licensing cartel is ingenious, they bundle together a very large number of mostly software patents from multiple companies into a neat package and charge the maximum fee for ALL the patents in that bundle (for anyone outside of the cartel), until the very last patent in bundle has expired (in all countries if you want to ship your product worldwide). I think that might be sometime, possible around 2024 maybe (and probably 2027 for the last patents outside of the US) for the MPEG-4 HE-AAC codec used in DAB+, but it could be earlier.

ref: https://en.wikipedia.org/wiki/Advanced_Audio_Coding#Licensing_and_patents

Comment on New RTL-SDR Drivers and SDR-Console ExtIO Available: Bias Tee Support, Direct Sampling, Tunable IF Filters and Improved Gain Profiles by JDow

All that comes to mind is unplug the dongle and plug it back in. Also make sure you are working out of the same directory into which I put the rtlsdr.dll and libusb*.dll file. If you are launching from a shortcut then make sure the shortcut points to the SDRC directory as the working directory.

{^_^}

Comment on Airspy HF+ Discovery Now Available for Preorder + Brief Initial Review by ken_c

sweet!!! i am buying one as soon as airspy gets them in stock

Comment on New RTL-SDR Drivers and SDR-Console ExtIO Available: Bias Tee Support, Direct Sampling, Tunable IF Filters and Improved Gain Profiles by Ste

Nope that’s not the problem. I never ever ever use desktop shortcuts, and I am not trying to use SDRUno either, I am talking about using SDR Console here, SDRUno is working fine for me. This topic is about using an alternative driver to enable HF without an upconverter in SDR Console, it has nothing to do with SDRUno.

Comment on Airspy HF+ Discovery Now Available for Preorder + Brief Initial Review by fM

No DAB+ decoding while STA709 can do it . Design choice : I2S bus connection to USB micro. Pity.

Comment on New RTL-SDR Drivers and SDR-Console ExtIO Available: Bias Tee Support, Direct Sampling, Tunable IF Filters and Improved Gain Profiles by Jock Mckie

Using latest software. if you have sdruno shortcut on the desktop, right click on the the shortcut, open file location, look at files, you will see two shortcut files files, “SDRuno.exe” and “SDRuno.EXTIO.exe”. it seems that the default on the desk top is SDRuno.exe. where as for rtl-v3 dongle use “SDRuno.EXTIO.exe.” you can make another short cut by highlighting and right clicking the file and selecting “create shortcut”

Comment on Stratux 1090 MHz + 978 MHz Diplexer Now Available by snn47

Thank you for the curves. Imho the insertion loss representation at amazon is quite misleading to potential buyers, since it does not clearly identify the total insertion loss
– 978 MHz insertion loss (above 3 dB): 2.73 dB @amazon vs. total insertion loss of 5.78 dB @978 MHz
– 1090 MHz insertion loss (above 3 dB): 2.88 dB @amazon vs. total insertion loss of 5.88 dB @1090 MHz

Can you confirm if I identified the logo correctly for 1090 MHz as Tai-Saw Filter, possibly TA1090EC (insertion loss 2.3 dB typ. 3.0 dB max) and the 978 MHz saw filter could be a TA0395a (insertion loss 2.2 dB typ. 3.5 dB max) since there don’t seem to be to many manufacteres for 978 MHz.

If you check the filter curves they are quite wide and provide not much more attenuation than 10 dB 20 to 30 MHz above and below the center frequency.
Depending the frequencies in use on your location signals can exceed -40 dBm (meassured) on multiple/many channel from e.g. :
– cell phone base stations below 960 MHz
– ground and aircraft transmitter
– L-Band PSR between 1215 MHz and 1400 MHz

Comment on Assembling the Chinese RTL-SDR Direct Sampling Kit by Eric Carter

I am at the assembly stage of making the RF Impedance transformer. The Amazon.de seller included wire, but without differing colors. I am so glad I found this website.

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