Don, There have been a lot of messages over last couple months regarding using 9913 / LMR 400 type cables in full duplex operations, my take on the overall responses by the majority of those who wrote in: don't use these types of cables in full duplex as they lead to the very problem your describing, due to noise generated in cable shielding materials. You likely get some additional feedback on this matter, but many users of these types of cables wrote in describing the same issues you have.
Rob K7EI -----Original Message----- From: sledman11 [mailto:[EMAIL PROTECTED] Sent: Tuesday, November 11, 2003 10:57 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Static / desense problems Looking for idea's on tracking down an intermittent static and desense problem I am have with a 2 meter repeater. The set up is as follows - ge mastr II base, LMR 400 coax (about 50 ft) into a diamond F23A antenna mounted on a chimney with 22' of black pipe mast. The location is the local firehouse which has a antenna mounted on a tower about 70' feet away from the repeater antenna. We also have a 220 Mhz, 4 element beam mounted on the back pipe mast about 12' under the repeater antenna. This is for echolink. Have turned off the 220 Mhz link with no affect on the problem. Have not been able to determine a pattern to the problem (ie cold, wet windy etc). When it happens it can sometimes completely wipe out a signal that was full quieting. Have checked the antenna and all is tight, dry and no problems that I can see visually. Including the coil and capacitor at the bottom of the antenna. Thought about running jumpers between the antenna mount, mast, 2 meter antenna and the 220 Mhz antenna so all are at ground potential. Do feel it is something outside that is causing the problem and not the radio or duplexers. Can create static on a weak signal coming into the repeater by banging on the mast. All idea's welcome. Thanks, Don WW2N Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
