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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> >> TenTec@contesting.com
> >> http://lists.contesting.com/mailman/listinfo/tentec
> >>
> >
> >
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> >
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> >
>
>
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