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I'm playing with an RTL-SDR dongle and an LNA, on Linux Mint with GQRX and DSD A lot of frequencies show digital transmissions, which the DSD is not converting. I don't whether it is a format DSD cannot convert, encrypted, or just distorted.

Is there a site were I can listen to how different digital transmission formats (DMR, D-Star, etc.) sound without converting, or any other strange transmissions?

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See SigiWiki:

This wiki is intended to help identify radio signals through example sounds and waterfall images. Most signals are received and recorded using a software defined radio such as the RTL-SDR, Airspy, SDRPlay, HackRF, BladeRF, Funcube Dongle, USRP or others.

https://www.sigidwiki.com/

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Here's one from the designer of fldigi.

http://www.w1hkj.com/modes/index.htm

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