&gt; Does an amateur license allow you to operate a RADAR system?<p>Yes, conditionally. RADAR does not fall under the &quot;specifically prohibited&quot; rule for communications, but it&#x27;s also not explicitly listed as &quot;specifically authorized&quot; either. Likely up to the discretion of whatever FCC official you asked.<p><a href="http:&#x2F;&#x2F;wireless.fcc.gov&#x2F;services&#x2F;index.htm?job=about_1&amp;id=amateur" rel="nofollow">http:&#x2F;&#x2F;wireless.fcc.gov&#x2F;services&#x2F;index.htm?job=about_1&amp;id=am...</a><p>&gt; the ability to detect and avoid [interference with other] signals.<p>This is a requirement for all amateur radio transmissions. However, so long as you take reasonable precautions (and react to any reports of issues), you can do it.<p>In my (unprofessional) reading of the phrase &quot;You determine for yourself whether your communications should be transmitted on amateur service frequencies&quot;, a reasonably powered experimental radar system which doesn&#x27;t interfere with other services would be OK.