diff --git a/content/pages/howto-radio.md b/content/pages/howto-radio.md
index 33a1ca6..fcfa787 100644
--- a/content/pages/howto-radio.md
+++ b/content/pages/howto-radio.md
@@ -10,6 +10,7 @@ Slug:howto-radio
 * [il mixer analogico (video)](#howto-video-mixer-analog)
 * [Palinsesto: programmare una trasmissione](#palinsesto)
 * [radiofrequenza AM](#am)
+* [link e strumenti utili](#link)
 
 ## <a name="listen"></a>Ascoltare radio Zeta-AM -> [clicca](https://radio.abbiamoundominio.org/public/zetaam)
 
@@ -241,6 +242,10 @@ andare in onda" (in: Edit Playlist > Advanced).
 
 in lavorazione
 
+## <a name="link"></a>link e strumenti utili
+
+ * [mic test online](https://mictests.com/)
+
 <hr width="100%" align=left size=42 color="red">
 
 ## [Costruire Comunità Resistenti - sito ZAM](http://www.zam-milano.it/)