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@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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