Hi Yong, The following link may be helpful: http://www.iol.ie/~bravo/r7_vertical.htm Cheers for now, 73, Adam VA7OJ/AB4OJ -----Original Message----- From: antennas-bounces at mailman.qth.net [mailto:antennas-bounces at mailman.qth.net] On Behalf Of Yong Surk Lee/HL1FB Sent: Tuesday, September 18, 2007 00:26 To: Antennas at mailman.qth.net; Boatanchors at mailman.qth.net Subject: [Antennas] Cushcraft R7000 repair Hello; My R7000 antenna started to show high SWR on all bands. I cleaned all contacts but it did not solved the problem. It looks like the traps or the matching box are possible source of the problem. Before I start attacking this, I need informations on (1) trap resonant frequencies and (2) matching box schematics and component values on R7000. Thank you in advance. de HL1FB/WW6N Scanned for viruses by Blue Coat http://www.WinProxy.com/