Merge note to rtlsdr

1 files changed, 12 insertions, 0 deletions

diff --git a/md/writeup/rtlsdr_usage.md b/md/writeup/rtlsdr_usage.md
index 68ec170..2bbec78 100644
--- a/md/writeup/rtlsdr_usage.md
+++ 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/)