Do you have a low pass filter after the isolator? 73 Gary K4FMX
> -----Original Message----- > From: [email protected] [mailto:Repeater- > [email protected]] On Behalf Of offtrack > Sent: Saturday, May 16, 2009 11:19 AM > To: [email protected] > Subject: [Repeater-Builder] Re: Isolator Loss > > Eric > > Thanks for the confirmation on this. Its an older one that was tuned for > me its a T-2200 that was replaced by the T-1530 I think, if I read > correctly at the telwave site. > > I notice that the TKR 750 is running fine with no intermod issues ect. > > I was not sure about adding that meter in line and only did a quick check. > Thanks for the warning on that one. > > The Diamond is so far working ok. I soldered all the parts in the antenna > and sealed up all the possible leak points with a compound call "through > the roof" This stuff stays semi flexible and is clear. Its located at my > home and has been in service for about 2 years for my Simplex Echolink > node I replaced with the repeater. Works pretty good, but that said I > would never put it on a remote site as your correct not at all heavy duty. > the radome is egg shell thin, I worry about it at the house as I am on a > hill and get hit with some good winds/icing. So the Isolator in line helps > ease my mind a bit. > > Thanks > KB7DZR > Scott > > --- In [email protected], "Eric Lemmon" <wb6...@...> wrote: > > > > 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 > > > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > >
