[DSP-10] Re: S-Meter reading

[Courtney Duncan]

That makes more sense than my explanation.  Apparently there is a  
different S-9 convention on VHF and above than on HF.  There is so  
much environmental noise on HF that the bar is "higher."

For a -93 dBm S-9, my DSP-10 is right on.

Courtney, n5bf/6

On Jan 10, 2008, at 12:36 AM, f5vkq wrote:

>
>
> Hello Courtney, GM and all the best for 2008 from France, F5VKQ,
> Hermann.!!
>
> (ex DC9UP)
>
>
>
>
>
> I am one of the DSP-10 enthusiasts in Europe and in the last years I
> have been building several DSP-10 (6) for me and my friends.
>
> I mainly use one of them for 10GHz EME-work.
>
> I also have been in good contacts with Bob and some of the features
> (at least partly) are out of my mind, but Bob implemented them.
>
>
>
> Pse take look to the table in the appendix and that's the relation
> what we use over here in Europe btw dBm (50 Ohm) and S-Meter steps.
>
>
>
> When I put in 50 uV  I am seeing the same as you see, but according to
> the official table here 5,01 uV are -93 dBm and gives me a S9 meter
> reading on the DSP-10.
>
>
>
> So, I was not aware of this when measuring around inside the DSP-10.
>
>
>
> Could it be that Bob also used the European  convention ???
>
>
>
> 73 de Hermann
>
> <S-Meter calib.jpg>