I'd consider a Z-matcher. Telewave, Sinclair, EMR and others make them. You don't want to make your transmitter unhappy. You didn't say how bad the SWR is. You might get away with doing nothing.
Chuck WB2EDV ----- Original Message ----- From: David Jordan To: Repeater-Builder@yahoogroups.com Sent: Monday, March 22, 2010 10:13 AM Subject: [Repeater-Builder] Commercial Antenna for 2m Repeater Question Hi Folks, Our club has been given permission to use one of the Public Safety antennas for our 2m repeater. The antenna is a PD-220-3A 150.5-158.5MHz. Our repeater freq. is 146.745. The antenna is fed with some nice looking Cell Flex LCF-12-50 ju, hard-line. The PD-200 is one of those totally enclosed fiberglass antennas; we don't have funds to pay for a climb to take down or replace or tweak. Have two questions: We think we can live with the power loss if we build a coupler to match the inevitable high SWR. Can someone point us to a formula to estimate/calculate both the projected SWR and power loss, etc? WAGs R fine too. Is anyone aware of any 2m coupler projects that might work for this scenario? Our current repeater antenna is in the attic of one of our members garage at 25ft ASL.this antenna would be 425ft ASL.so even with losses we expect significantly better performance. 73, Dave WA3GIN ------------------------------------------------------------------------------ No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.791 / Virus Database: 271.1.1/2763 - Release Date: 03/22/10 03:33:00
