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title: "SDR Console: Fixing Audio Stutter Issues"
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type: post
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author: micha
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date: 2023-04-14T06:00:00+02:00
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url: /sdr-console-audio-stutter/
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tags:
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- Ham Radio
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- SDR
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- Windows
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---
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# The Setup
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* Lenovo Thinkpad T420
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* Intel Core i5-2520M CPU
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* 16 GB RAM
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* Intel 82579 Ethernet Interface
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* Windows 10 Pro
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* [SDR Console v3.3 Beta Build 2870](https://www.sdr-radio.com/Console)
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# The Problem
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I had lots of audio stuttering/drop-outs while using [SDR Console] on my Thinkpad T420 (see above), even if no other programs were running.
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# The Fix
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In order to find out if there are device driverrs that are blocking other processes due to high DPC latency spikes, I've downloaded and executed the tool [LatencyMon](https://resplendence.com/latencymon).
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The following screenshot shows the main screen of LatencyMon running:
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![image](/img/latencymon-1.jpg)
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The drivers with the highest execution times and/or numbers of DPC executions can be seen unter "Drivers":
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![image](/img/latencymon-2.jpg)
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In my case it turned out that the _ndis.sys_ driver was the main issue with extreme executions times (not visible in the screenshot, took it after the fix). After reading [this very informative blog post](https://geekhack.org/index.php?topic=82387) I've replaced the generic network driver for Intel cards with a much older version from Lenovo (from 2011). The execution times are now still not great but much lower and I haven't experienced any audio stutter problems in SDR Console anymore.
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You can download the Lenovo driver from here: https://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/83rw15ww_64.exe
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