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+++ b/md/writeup/rtlsdr_usage.md
@@ -186,6 +186,18 @@ to setup with rtlsdr stick.
Once there was sync error when was trying to use rtl_test or rtl_adsb.
To fix that changes for better quality usb cable.
+### 4.2.More then 1 dongle
+
+When you run you run usually more then 5 dongles you could get error saying
+something about libusb error (-5) you need to decrese buffer as default one
+is (16 * 16384) and it should work
+
+```bash
+rtl_test -b [NEW_SIZE]
+```
+
+thx goes to freenode/##rtlsdr chan
+
# 5.Links
1. [http://kmkeen.com/rtl-demod-guide/](http://kmkeen.com/rtl-demod-guide/)