[1000mp] Monitor roughness

Tue, 9 Mar 2004 08:51:28 -0800 (PST)

It is a misconception to believe either of the
following are somehow to be expected in a radio's
s-meter performance:

1) S9 = 50uV
2) 1 S-unit = 6dB

While they might be noble "goals" they are mostly
fiction.  Both my TS-940 and my 'MP have much smaller
dB/S-unit - in fact down near S1-S3 it's more like 1-2
dB/S-unit.

Mike N2MG

--- "Tom Rohlfing (home)" <[email protected]>
wrote:
> I made this comment a few weeks ago.  :)  The answer
> to this question
> depends on what band you are talking about, and
> whether you have your
> radio set for "tuned" or "flat."  And even when you
> know the magic
> signal level for S-9 (for a specific band and preamp
> condition), you
> need to recognize that the dB-per-S-unit below S-9
> is VERY compressed.
> Instead of 6 dB per S-unit, an S-unit may be closer
> to 2 or 3 dB, and
> falls off very quickly.  If interested, see the very
> nice article called
> "S-Meter Blues" by Greg Ordy, W8WWW.  It includes
> some 1000MP-specific
> data I took on my MP, which will help you understand
> the situation (at
> as measured on my MP).  Just do a Google search for
> "S-Meter Blues" and
> you will find the article.
> 
> 73,
> Tom / W7GT
> 
>   
> 
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]
> On Behalf Of Thomas Beltran
> Sent: Monday, March 08, 2004 11:07 PM
> To: [email protected]
> Subject: Re: [1000mp] Monitor roughness
> 
> 
> 
> > with a a +11 dBu signal at the antenna jack.
> > Adjust menu 9-1 for 1 bar on the S Meter.
> > Why, because the service manual says to do it this
> way.
> > Winds up to be about 12-13 on the menu without the
> Inrad front end
> mod.
> >
> I wondering if someone can, after performing this
> process, see what
> level of
> signal is required for an S-9 reading on the
> S-meter.  Tom W6EIJ
> 

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