Hi Kim
The S meter WOULD move! It would go to S-7, assuming correct
calibration. Fifty microvolts=S-9 is the calibration standard.
Ron
K3MIY
Quoting Kim Elmore <cw_de_n5op@sbcglobal.net>:
> Wait a minute... By way of example, do you mean to say that if I
> injected a 50 uV signal into the antenna terminals of the OII I'd see
> an S9 indication and that if I then selected 12 dB of attenuation via
> the front panel, the S-meter wouldn't move?
>
> Kim N5OP
>
> At 09:02 AM 4/24/2012, you wrote:
> >Yes the ATTN and Pre functions do change the S METER READING. However
> >even then with those changes S-9 still equals 50 uV. There is a
> >difference in S meter reading and S meter calibration.
> >
> >73
> >Bob, K4TAX
> >
> >
> >
> > > On my Orion II...the ATTn and pre-amp changes the s meter reading a
> > > lot??
> > > What do you mean on TT radios the same is true of the ATTN and Pre-amp
> > > as to the s-9 = 50uv?
> > > Thanks,
> > > 73,
> > > Lee
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: Bob McGraw - K4TAX <RMcGraw@Blomand.net>
> > > To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
> > > Sent: Mon, Apr 23, 2012 11:48 pm
> > > Subject: Re: [TenTec] 566 Orion II Firmware Version V3.029
> > > ---SpectrumDisplay &Tuning...
> > >
> > >
> > > I usually find a spot on the band where there is no signal, no QRM or
> > > splatter and with the antenna of choice. Turn the RF Gain up to the
> > > point
> > > you see the noise flicker on the S meter. Note that level say S-6. I
> > > normally use th SLW AGC as it makes the S meter a bit easier to read
> > > peaks.
> > > Then I usually switch the radio to my dummy load and then adjust the RF
> > > Gain
> > > such that the S meter indicates about 1 S unit lower than the previous
> > > noted
> > > level or about S-5. Then back to the antenna. To me that optomizes
> > > the
> > > gain for the antenna and noise.
> > >
> > > With a bit of practice one can set the RF Gain just looking at the S
> > > meter
> > > values and backing the RF Gain down as one gets a "feel" for what is
> > > taking
> > > place. All the other steps are "just to make it easy" and repetitive.
> > >
> > > Just remember, with Tentec radios the S meter always references S-9 as
> > > being
> > > equal to ~50uV regardless of RF Gain values. Same is true with the
> > > ATTN
> > > function engaged at some value or the Preamp engaged.
> > >
> > > 73
> > > Bob, K4TAX
> > >
> > >
> > >
> > >
> > > ----- Original Message -----
> > > From: "Kim Elmore" <cw_de_n5op@sbcglobal.net>
> > > To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
> > > Sent: Monday, April 23, 2012 10:24 PM
> > > Subject: Re: [TenTec] 566 Orion II Firmware Version
> > > V3.029 ---SpectrumDisplay &Tuning...
> > >
> > >
> > >>I tried this with my OII, think that I must have missed something. I
> > >> simply never see the S-meter drop and then rise as I decrease RF
> > >> gain. Of course, it will drop if I turn off the preamp, but not as I
> > >> change the RF gain setting using the multi knob. What I see is that
> > >> the minimum S-meter reading rises as RF gain is reduced (as if the
> > >> AGC voltage is being increased which is, in some sense, what's
> > >> happening). At some point the minimum S-meter reading is above the
> > >> maximum deflection due to static crashes. Then, any signals stronger
> > >> than the static crashes will lead to an upward deflection. Am I
> > >> missing something subtle? Does anyone else see the S-meter drop then
> > >> rise as the RF gain is decreased?
> > >>
> > >> I set my SAF by ear as per the TT instructions, decreasing RF gain
> > >> until I hear only a little ringing. Even though I am almost
> > >> exclusively CW, I tried it a couple of times on SSB was surprised how
> > >> much it helped on weak signals.
> > >>
> > >> 73,
> > >>
> > >> Kim N5OP
> > >>
> > >> At 02:38 PM 4/23/2012, you wrote:
> > >>>A visual clue for setting RF Gain is the S-meter. While listening to
> > >>>just noise, as you decrease the RF-Gain, the S-meter noise level
> > > drops,
> > >>>and continues to drop, until you reach a point where the S-meter
> > >>>reverses and starts to climb - while the RF-Gain continues to be
> > > turned
> > >>>down. Thus, there is a point where the S-meter changes direction
> > > while
> > >>>the RF-Gain is still being turned down. (Sorry... I find this
> > >>>difficult to say in words...) The point where the S-meter reverses
> > > is
> > >>>the sweet spot (although I find it is really just above that
> > > point...)
> > >>>
> > >>>Play with it and you will SEE what I mean. I think you will find the
> > >>>S-meter reverses just at or just below the point where you can HEAR it
> > >>>change over.
> > >>>
> > >>>I have an Omni VII and this works on it -- I spent time on my
> > > friend's
> > >>>Orion II and it seemed to work exactly the same way, albeit at
> > > different
> > >>>points on the dial. ...snip...
> > >>
> > >> _______________________________________________
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> > >>
> > >
> > >
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> > >
> >
> >
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