Scott, I must assume that you purchased a Telewave T-1530 Isolator, and its specified insertion loss is 0.4 dB. The readings you took indicate that the isolator is working properly. However, it is not a good idea to insert a meter between the isolator and the dummy load. The correct operation of the isolator depends upon a stable 50 ohm impedance at the dummy load port.
I think you made some good choices for the duplexer, feedline, and isolator. The Diamond F22 is perhaps not the most rugged antenna for 2m repeater use, but YMMV. 73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of offtrack Sent: Friday, May 15, 2009 7:27 PM To: [email protected] Subject: [Repeater-Builder] Isolator Loss Hi all, Thanks for the group it has helped me out a bunch. My system here is a Kenwood TRK K2 and Telewave TPRD-1556 6 can set. Feed line is Heliax LDF4-50A about 70 feet and the antenna is a Diamond F22 that has been worked over and sealed up better. The system is new and today I added a Telewave Isolator to the PA output before the duplexer TX input. With my meter I got about 28 watts out of antenna side of the duplexer set when connected to my antenna with out the isolator. With the Isolator I am getting about 26 watts out now. This seems good to me but I am new to an Isolator. Putting the meter between the isolator and the dummy load it is showing around 1.6 watts going to the dummy load. Just want to see if this is ok for this? KB7DZR Scott
