[HATS] Re: Put on your thinking hat!

[Marius Hauki]

Good idea, 

have been thinking in the same direction.

You should pherhaps filter the upper sideband with a simple filter to 
get a higher dynamic range on your analyzer. This might not be neccessary 
since your analyzer has a roll of on its own. 
You could use mixers from Mini Circuits. A crystal osc with multipliers
would probably be a little better than a PLL since the phase noise of the
PLL will reduce the dynamic range of your measurements. Mini circuits also 
now have multipliers !
Also you should have a step attenuator on the input as well as an 
amplifier to boost the input level if you are going to look at "on air" signals.
The mixers from Mini Circuits need a relatively high input and also have
a relatively high insertion loss. 

73 de LA9EEA
Marius 



"Christopher W. Boone" wrote:
> 
> Avcomm the folks who make spectrum analyzers for satelite users, etc
> have such a device I believe Fred.....I think you can look at it
> on their web site...I dont have the URL but Im sure its avcomm.com or
> you can search under Google for PSA-65 (one of their models) and
> that should find it.
> 
> Chris
> WB5ITT
> 
> Fred Juch wrote:
> >
> > Here is the problem -
> >
> > I have a Spectrum Analyzer that only goes to 1.5 GHz. Poor Me!
> >
> > I want to design a circuit to put on the input to convert 2.0 - 2.5 GHz
> > down to 1.0 - 1.5 GHz.
> >
> > Here is how I propose to do it.
> >
> > I need a PLL like the one in the HATS transmitter to generate 1.0 GHz
> > signal. I feed that and an antenna into a mixer. The output will be both
> > 2.4 GHz + 1 GHz = 3.4 GHz
> > and
> > 2.4 GHz - 1 Ghz = 1.4 Ghz which my analyzer can handle.
> >
> > I know the levels will be critical, but what do you geniuses think about
> > this product? It should be small, and run on low power. It could even be
> > scaled to other bands if the components are available.
> >
> > What do you think?
> >
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