Yes. The duplexor is like a tx/rx switch. If the PA is between the duplexor and the antenna, then you won't be able to receive because the signal from the antenna won't pass through the PA in reverse. Bob kk6ecm _____ From: app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] On Behalf Of Steven Donegan Sent: Sunday, October 04, 2015 3:17 PM To: App_rpt Mailing List Subject: [App_rpt-users] First duplex repeater - question aboutduplexor/power amp Is there any reason why the power amp cannot be placed between the duplexor and antenna? My repeater will be 2 modular 1 watt radio modules, a 20W capable 6 cavity duplexor and a Mirage power amp.If the amp is after the duplexor then cool, if not then a more expensive duplexor will be required... TIA Steven Donegan KK6IVC General Class FCC License Silver State Car #86 www.sscc.us