Oops, I forgot about the transformer.
Sam W.

--- In spectrumanalyzer@yahoogroups.com, william sprowls <wsprowls@...> wrote:
>
> Hi Sam and All,
> The problem with that is that the Log Detector Module is now designed with a
broadband transformer in its input. It is about 2 to 160 MHz.  Above that, it
will be horrible.
> Scotty
>
> --- On Thu, 7/9/09, Sam Wetterlin <swetterlin@...> wrote:
>
> From: Sam Wetterlin <swetterlin@...>
> Subject: [spectrumanalyzer] Re: Simple RF power Meter
> To: spectrumanalyzer@yahoogroups.com
> Date: Thursday, July 9, 2009, 6:43 AM
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> Here's another thought for a power detector to check the PLO outputs:
What about using the log detector? 1 GHz is outside its nominal range, but I'll
bet it would still show some response. For example, my Leveler uses an AD8367
with a 500 MHz nominal range, but it definitely operates at 1 GHz; it just
becomes less precise.
>
>
>
> I haven't tried it, but I'll bet that if you force the PLO near the low end of
its range and hook it to the log detector input, if there is a signal there will
be some DC output level; you just won't know precisely what dBm level it
corresponds to. But you could check several PLO outputs. If 3 give approximately
the same DC level and a fourth one gives a much lower level, it is a pretty good
bet that the first 3 are OK and the fourth one isn't.
>
>
>
> Sam W.
>
>
>
> --- In spectrumanalyzer@ yahoogroups. com, "Sam Wetterlin" <swetterlin@ ...>
wrote:
>
> >
>
> > Here is a PCB layout for a peak detector that I put together for this very
purpose:
>
> > <http://www.wetterli n.org/sam/ SA/PeakDetector. pcb.
>
> >
>
> > I didn't do an actual schematic, but the PCB layout has component values and
annotations. It uses the LTC5505 and very few other components. It should give
you an idea of the output level without having to do any calibration.
>
> >
>
> > If you have an output problem, the first thing to check is the tiny inductor
at the ERA output. Its terminals make contact on the bottom, not the ends, so it
is possible that one end did not get soldered. Check the DC voltage at the ERA
output; it will be way off the schematic value if the inductor is not properly
attached.
>
> >
>
> > In fact, a good share of potential RF problems can be diagnosed just by
checking DC values.
>
> >
>
> > Sam W.
>
> >
>
> >
>
> > --- In spectrumanalyzer@ yahoogroups. com, Ernst van Spronsen <evanspronsen@
> wrote:
>
> > >
>
> > > Hi,
>
> > >
>
> > > I think, I have a problem with 1 of the output in PLO 2 or 3. To verify
>
> > > that I need a simple RF power meter in the Ghz range. I can't find any
>
> > > schematic on the Internet that is suitable for this.
>
> > > Do you have a suggestion of a simple schematic, I can use.
>
> > >
>
> > > Hope you can help.
>
> > > Ernst van Spronsen
>
> > >
>
> >
>