Don, I have encountered this problem with low-level signals. It seems to vary greatly from manufacturer to manufacturer (the company we had the best results with went out of business). When the contact(s) became dirty I would run a DC current and clean it. The problem would quickly return and the only real fix was to replace the relay. One to two years of life was typical. I also would like to know a good solution.
Dave Cuthbert Micron Technology From: [email protected] [mailto:[email protected]] Sent: Monday, April 21, 2003 11:28 AM To: [email protected] Subject: Low signal switching Hello Friends, I have an application in which I would like to switch system signals on coax cables. One system is 80 to 1000 MHz, the other is 1-2 GHz. I have found coax switches by Narda, DB Products and Dow Key. Dow Key indicates that the signals should be above -20 dBm to ensure that contact resistance doesn't cause a problem. The others do not spec or address low signal issues. My branches operate at -35 dBm, 0 dBm and 50 dBm. The 2 higher values are not a problem, just the -35 dBm. Are there other companies that you are aware of that make 50 ohm coax switches that are specified to operate at low signal levels? Other ideas? Best regards, Don Umbdenstock Sensormatic This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
