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

[Robert Mcgraw]

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 at Blomand.net>
> To: Discussion of Ten-Tec Equipment <tentec at 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 at sbcglobal.net>
> To: "Discussion of Ten-Tec Equipment" <tentec at 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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