Ken;
For me, impending failure usually starts with rx desense out
of nowhere, followed by heat to the touch, followed by noticeable
power output drops... I never really saw it on packet systems as the
short duty cycle helps the heat issue, but many multiband antenna's
exhibit less than optimal swr and these devices really want to see 50
ohms on each leg..... My failures were with Diamond products in
particular and a Comet unit as well....
I know of a commercial Kenwood shop that endorses the Larsen
versions as very reliable...My comments are basically targeted at
some of the ham grade products.... Tri-plexers in particular..... The
smaller, the more likely to develop issues with heat... power ratings
are not really realistic in most of specimens I saw fail... I would
just not recommend one for commercial application, or high duty
cycle, when commercial version are available which are better quality
albeit more costly....
Doug
KD8B
At 11:31 AM 11/14/2005, you wrote:
>Guess I've been lucky so far then. 5 years and going strong
>
>But I will keep a watchful eye out!
>
>Ken
>
>
>At 09:59 AM 11/14/2005 -0500, you wrote:
> > I have found that most amateur band couplers or "diplexers"
> >do not seem to operate well in full duplex 100 watt 2x environments
> >for very long. In RX systems, is one thing, but under long TX power
> >keys they seem to heat up and dis-assemble themselves internally. The
> >commercial versions from folks like TX/RX are well rated for
> >continuos duty of repeater application. Actually I have had several
> >amateur versions fail over the years, but the commercial ones live
> >through most anything but water and lightening....
> >
> >Doug
> >KD8B
> >
> >At 09:47 AM 11/14/2005, you wrote:
> >
> >>At 01:14 PM 11/14/2005 -0000, you wrote:
> >>
> >> >I know that this has been asked before, but does anyone know of a
> >> >commercial diplexer with a higher power rating so that one can use one
> >> >dualband antenna at the repeater site for both a VHF and UHF repeater.
> >>
> >><----While I don't use a dualband antenna, I do use a pair of Comet
> >>diplexers at one of my sites, so I only need one run of hardline up a 170'
> >>tower. Obviously one at the repeater end and another at the top of the
>tower.
> >>
> >>As I remember, it is rated for 200 watts. The repeater (UHF), delivers 75
> >>watts out of the duplexer and the 2 meter remote base radio delivers 60
> >>watts. I've had no problems with the arrangement in over 5 years.
> >>
> >>Ken
> >
> >
> >
> >
> >
> >
> >
> >Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
>------------------------------------------------------------------------------
>President and CTO - Arcom Communications
>Makers of state-of-the-art repeater controllers and accessories.
>http://www.ah6le.net/arcom/index.html
>We offer complete Kenwood TKR repeater packages!
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>
>
>
>
>
>Yahoo! Groups Links
>
>
>
>
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