Go here: http://www.repeater-builder.com/antenna/ant-sys-index.html
for a boatload of info, including isolators. Chuck WB2EDV ----- Original Message ----- From: "NORM KNAPP" <[email protected]> To: <[email protected]> Sent: Saturday, May 16, 2009 1:41 PM Subject: Re: [possible spam] RE: [Repeater-Builder] Re: Isolator Loss > Kinda OT, but not entirely.... > 1) What does tHe isolator do and why would I need one? > > 2) I work for a Kenwood dealer. Kenwood has admitted to our company that > the TKR-750 is rife with internal desense caused mainly by synthesizer > birdies. Supposedly no two will have exactly the same birdies or desense > on the same freqs. They have told us that there is a fix under warrantee > but it has to go to them for the fix and you must provide freq info for > custom fix. > Has anyone else seen this problem or heard of this? > > 73 de N5NPO > Norman knapp > > ----- Original Message ----- > From: [email protected] <[email protected]> > To: [email protected] <[email protected]> > Sent: Sat May 16 11:02:44 2009 > Subject: [possible spam] RE: [Repeater-Builder] Re: Isolator Loss > > > > Do you have a low pass filter after the isolator? > > 73 > Gary K4FMX > >> -----Original Message----- >> From: [email protected] >> <mailto:Repeater-Builder%40yahoogroups.com> [mailto:Repeater- >> [email protected] <mailto:Builder%40yahoogroups.com> ] On Behalf Of >> offtrack >> Sent: Saturday, May 16, 2009 11:19 AM >> To: [email protected] >> <mailto:Repeater-Builder%40yahoogroups.com> >> 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] >> <mailto:Repeater-Builder%40yahoogroups.com> , "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:Repeater-Builder%40yahoogroups.com> >> > [mailto:[email protected] >> > <mailto:Repeater-Builder%40yahoogroups.com> ] On Behalf Of offtrack >> > Sent: Friday, May 15, 2009 7:27 PM >> > To: [email protected] >> > <mailto:Repeater-Builder%40yahoogroups.com> >> > 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 >> >> >> > > > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > >
