[TenTec] 566 Orion II Firmware Version V3.029 ---SpectrumDisplay &Tuning...

[k3miy at csonline.net]

James and others

I don't think the s meter is at the antenna input. It's usually in the
IF circuit. TenTec worked a way to extract signal from the noise, and
measure it. If you think about it, that's not hard to do with today's
technology.

Ron
K3MIY



Quoting Richards <jruing at ameritech.net>:

> Not the same as other rigs...   The Omni VII works the same as the Orion 
> II, and here is what it says in the ARRL product review :
> 
> 		The receive S-meter is worth particular
> 		note on two counts. First, it is the only
> 		S-meter I’ve encountered that provides a
> 		reading that just indicates receive signal
> 		strength.
> 
> 		Other S-meters show wild changes in value
> 		with a change in preamp or attenuator setting.
> 		Not this radio — its value automatically compensates
> 		for such changes and the readings are close
> 		whether the preamp is on or off or attenuation
> 		is inserted. Second, it showed S-9 with a 67 µV
> 		(only 2.5 dB, less than half an S-unit, from the
> 		original 50 µV standard that Collins established),
> 		then dropped one S-unit every 6 dB, just as
> 		it’s supposed to. With this radio, you can give a
> 		meaningful S-meter comparison between received
> 		signals!
> 
> 
> Hope this helps clarify the matter.
> 
> Disclaimer - A rather non-scientific, vernacular statement follows:
> 
> I understand by all of this that the S-meter reads the raw signal 
> strength BEFORE the rig does stuff to it, like run the pre-amp,  or 
> apply the attenuator, or apply filters, so that no matter what you do to 
> the signal in the rig, it reads the signal strength first, as it enters 
> the rig.  Thus, the signal strength is not supposed to vary if you do 
> stuff to it in the rig, on its way to being converted into sound.
> 
> ================  James - K8JHR  =====================
> 
> 
> 
> On 4/24/2012 10:13 AM, kc9cdt at aol.com wrote:
> > Bob,
> > I'm dense today???
> > So, if I have a nice solid S-9 signal coming in from S. Africa...and I
> > engage pre-amp, and it goes to +15 over 9....
> > Does that mean the pre-amp amplified the signal to more thanm 50uv?
> >
> > So, the s meter really is not correct as to the strength of the
> > incoming signal with ATTN or pre-amp on.
> > So we disregard the S meter with any of those guys engaged.
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> 




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