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

[Andrew T. Flowers, K0SM]

Being a VHF/microwave freak myself I'm all for this.  We are lucky 
enough to have access to a NF meter once a year or so in this town, but 
it sure would be nice to have a reasonably accurate NF meter that isn't 
under lock and key 364 days/year.

Andy K0SM/2

Bob Larkin wrote:

> 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





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