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Updated RTL SDR device notes (markdown)

Jakob Ketterl 2020-10-09 00:08:37 +02:00
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RTL-SDR-device-notes.md

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# Problems with Elonics E4000 tuners
RTL-SDR devices come with a range of tuners, and all of them work, including the E4000 tuner. Many people have been reporting issues with these devices though since they do not work initially due to the value `"rf_gain": 30` that is contained in the default configuration. The E4000 tuners do not support this value, so the simple solution for these issues is to change this to a supported value (the next possible values are 29 and 34).
RTL-SDR devices come in many sizes and shapes. One thing that will vary is the type of tuner chip that has been chosen by the manufacturer. As far as we are aware, all of them work, including the E4000 tuner. Many people have been reporting issues with devices containing E4000 tuners though since they do not work initially due to the value `"rf_gain": 30` that is contained in the default configuration. The E4000 tuners do not support this value, so the simple solution for these issues is to change this to a supported value (the next possible values are 29 and 34).
One other very common complaint with the E4000 tuners is that they show a very prominent DC offset, which shows as a very strong "line" going right down the middle of the waterfall, sometimes even flanking out to the sides. This cannot be fixed by OpenWebRX since it is contained in the IQ data that is sent by the device, or in other words: What you see is what OpenWebRX receives from the hardware. There is algorithms to compensate these, they are however unable to recover any signals that have been compromised. OpenWebRX does not currently implement any such algorithm.