[amsat-bb] MFJ-916BMN duplexer

[GEO Badger]

The manufacturer's power rating for this part is much higher than a typical, operative term, sat radio will put out. I use the Comet CF-360 with 100W and have experienced no heating of the duplexer.
It is however, not to be used outdoors where it can be exposed to precipitation. If used outdoors an easily made enclosure can be made from a tupperware or like product. I use the plastic takeout containers we get here in coastal CenCal. Right now I have a gazillion of them.  lol
---  
 Ciao baby, catch you on the flip side  
73 de W3AB/GEO     

 http://www.w3ab.org

You can say "over", you can say "out", you just can't say "over and out". 

    On Thursday, May 14, 2020, 10:44:36 AM PDT, Michael Walker via AMSAT-BB <amsat-bb at amsat.org> wrote:  
 
 If it works, awesome!  Problem solved.

I tend to trust the data the designer publishes first.  After all, they
know the limit of the components they use.

I would be concerned that any heat generated by the RF power would change
the specs of the components used and that may result in more attenuation
and may change the design specs.  That could also result in higher SWR
values.

If I had one, I would sweep it to make sure it still works as it should.
Maybe someone who has a tracking generator has done that already.

There is a big difference between 0.5 watts and 25 watts.

500mwatts is about 14 V P-P and 25 watts is 100 V P-P

Mike va3mw






On Thu, May 14, 2020 at 11:59 AM Paul Stoetzer <n8hm at arrl.net> wrote:

> I put 30 watts through mine all the time. It's had 70 watts put
> through it and survived.
>
> W8LID got an explanation of the power rating from the manufacturer.
> I'll see if he can post it here.
>
> 73,
>
> Paul, N8HM
>
> On Thu, May 14, 2020 at 11:44 AM Michael Walker via AMSAT-BB
> <amsat-bb at amsat.org> wrote:
> >
> > Just to mention on the BLP-200+, you can't transmit through it as it has
> a
> > 0.5 watt maximum RF power.  It is designed for a receive-only lines.
> >
> > Mike va3mw
> >
> > On Thu, May 14, 2020 at 11:32 AM Don KB2YSI via AMSAT-BB <
> amsat-bb at amsat.org>
> > wrote:
> >
> > > I have used a MFJ-916B in my portable setup and it was the biggest
> > > improvement I have made to my setup. I have since moved to a
> Mini-Circuits
> > > BLP-200+ as I use 2 radios verse a single full duplex radio.
> > >
> > > On Thu, May 14, 2020 at 10:14 AM BeetleJerald Oliver via AMSAT-BB <
> > > amsat-bb at amsat.org> wrote:
> > >
> > > > I am still having problems with the 9700 on Mode J.  Has anyone yet
> used
> > > > the MFJ-916BMN duplexer on their system?  I like the fact that it is
> > > > designed for outdoor use and can be mounted to the mast.  I have a
> comet
> > > > CF-416, but would have to build a waterproof box for it if used and
> left
> > > on
> > > > the tower....Any thoughts
> > > > 73
> > > > Jerry
> > > > KJ4EU
> > > > _______________________________________________
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> > >
> > >
> > > --
> > > 73,
> > > Don KB2YSI
> > > https://www.hamqth.com/kb2ysi
> > > _______________________________________________
> > > Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
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> > _______________________________________________
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> > to all interested persons worldwide without requiring membership.
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_______________________________________________
Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions expressed
are solely those of the author, and do not reflect the official views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb