with that in mind...
how does a guy figure a dB drop pad? ex, what is
used to figure a 3dB drop and does the formula and or
resistances change with frequency?
~Ben, KB9LFZ
--- DCFluX <[EMAIL PROTECTED]> wrote:
>
> Yeah, I built the post mixer filter a couple of
> nights ago from some
> brass platting. I think I am going to send away for
> a Level 17 mixer
> with the correct frequency ranges so I can run
> closer to +0dBm from
> the modulator.
>
>
> On Thu, 10 Feb 2005 16:30:02 -0800, Bob Dengler
> <[EMAIL PROTECTED]> wrote:
> >
> > At 2/9/2005 09:35 PM, you wrote:
> >
> > >I have a Circa 1982 Mini Circuits mixer, ZXM-2
> but it seems it is not
> > >made anymore as MCL denies all knowledge of its
> existince. I was
> > >wondering if anyone had the spec sheet for it?
> It has three BNC
> > >connectors on in, "R" "I" "L" and is about 2" X
> 3/4".
> > > I was hoping I could run a 1GHz LO into it to
> hetrodyne a cable
> > > modulator to 1277.25 for my up and coming ATV
> repeater project.
> >
> > My '91/'92 Mini Circuits catalog doesn't list it
> either. However, looking
> > at their numbering scheme for their other mixers
> suggests that it's a
> > 5-1000 or 10-1000 MHz unit.
> >
> > Yes you can use them as up-converters. However,
> your conversion loss will
> > be higher since your output signal will be above
> the upper limit of the mixer.
> >
> > Start driving the LO port with 0 dBm @ 1 GHz &
> slowly increase the LO drive
> > until you see diminishing increases in desired
> output. It's probably wants
> > +7, +10 or +13 dBm of LO. And of course make sure
> you filter out the
> > 722.75 MHz that will also be coming out of the RF
> port of the mixer (1 GHz
> > into LO port, 277.25 MHz into IF port), as you'll
> be getting more power
> > there than at 1277.25. Also make sure that your
> 277.25 signal is at least
> > 20 dB down from your LO drive level, otherwise
> your video signal will
> > intermodulate with itself within the mixer,
> generating all kinds of crap
> > throughout the 1.2 GHz band. This means you won't
> get more than around -20
> > dBm of 1.2 GHz signal out of the mixer, assuming
> it works OK at 1.2 GHz.
> >
> > Bob NO6B
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
>
>
>
>
>
> Yahoo! Groups Links
>
>
> [EMAIL PROTECTED]
>
>
>
>
>
>
=====
-------------------------------------------------
~Ben, KB9LFZ
Got your radio on and "listening?"
Then KEY the radio and say that you are! LET US USE WHAT WE HAVE!!
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