[DSP-10] DSP-10 as Automatic Noise Figure ?

[Bob Larkin]

Hello Hannes,

Yes, good idea!!  We have had some discussion of this, locally, and the 
current plan is
  1-Control a noise source through the parallel port---requires a 1 
transistor adaptor for 28V
   2-Measure Y factors
   3-Variable averaging
   4-Convert to NF and Te
   5-Allow for self measurement  of NF and using this for Gain and NF,  a 
la Eaton 2075 or HP Automatic meters.

It is not too far away.

Of course, you can presently use the Power-to-Tone measurement, with ALT-x 
to find Y factors and do the rest with a calculator.

The other thought was to use the same control for a switch at the antenna, 
between the antenna and a load. This would become a simple Dicke 
radiometer. The calculations would then estimate sky temperature as a 
source drifted through the beam.  A plot of Y factor, converted to 
temperature would be fun.

There must be other uses???

Thanks for the thoughts!  Keep them coming as all are most useful!

73, Bob

At 02:04 PM 12/13/2005, you wrote:
>Hello !
>
>I have been thinking abt to use the DSP-10 as a noise figure meter. It 
>would have been nice to have a "Noise figure meter"
>user interface running in the PC -using the functions in the DSP, I guess 
>that it is not neccesary to change anything in the DSP
>software.
>
>It should be possible to enter the ENR value (for the noise source ) then 
>run a calibration, insert the DUT and get the gain and NF presented 
>directly on the screen. (could of course be used with transverters too)
>
>The noise source ON/OFF switching would require a small driver circuit to 
>get 28 V - There are probably some signal that could be
>used to control the noise source driver.
>
>I am not that much into software programming that I could fix such a 
>project - but it had been nice to se and test it , if there are
>someone who is interested ?
>
>best 73 de SM6PGP - Hannes
>
>
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