That would almost be the case for standard pulse-width modulation or plate
modulation, except for positive peaks > 100% which is common in commercial
broadcasting (The FCC allows 125% peak positive modulation, but it's
possible to do much more). In this case, Doug Smith, the original software
engineer on the Orion designed a DSP circuit that actually increased the
carrier as the modulation pushed past a certain point. There was a detailed
explanation in his website, but unfortunately the site is gone. There may
be articles about this in QEX.
BTW, although the agreed-on standard for an S-Unit is 6 dB, many radios,
including the Orion II with the newest firmware in, use 3 dB. The late
Jerry Cebik had an excellent article on the genesis of the S-Unit and the
RST system, but that's gone from the web too.
Ron N6IE
www.N6IE.com
----- Original Message -----
From: "Dr. Gerald N. Johnson" <geraldj@weather.net>
To: <tentec@contesting.com>
Sent: Saturday, June 12, 2010 6:53 AM
Subject: Re: [TenTec] Orion 2 Firmware 2.044A PTT
> If the carrier stays at 14.5 watts, the peaks can only be 58 watts for
> full modulation. As a practical manner, the difference between 80 watts
> and 100 watts can only be measured locally, not at any distance where 1
> S unit is 6 db, a power change by a factor of 4.
>
> 73, Jerry, K0CQ
>
> On 6/12/2010 8:30 AM, Rsoifer@aol.com wrote:
>> Tnx Ron,
>>
>> That seems a bit low to me. The peaks should be closer to 100 watts,
>> no?
>>
>> 73, Ray W2RS
>>
>>
>> In a message dated 6/12/2010 12:03:13 A.M. GMT Standard Time,
>> ronc@sonic.net writes:
>>
>> I'm seeing 14.5 Watts with no modulation and mod peaks 60 to 80 Watts.
>>
>> Ron N6IE
>> www.N6IE.com
>>
>> ----- Original Message -----
>> From:<Rsoifer@aol.com>
>> To:<tentec@contesting.com>
>> Sent: Friday, June 11, 2010 1:16 PM
>> Subject: Re: [TenTec] Orion 2 Firmware 2.044A PTT
>>
>>
>>> John,
>>>
>>> I don't have a true peak-reading wattmeter, so I can't measure the PEP
>>> output. Jim may be right about controlled-carrier; I can't tell.
>>> When
>>> using
>>> TUNE and PWR, I get 95 watts, but only 11 watts with PTT and no
>>> speech.
>>>
>>> 73 Ray
>>>
>>>
>>> In a message dated 6/11/2010 7:01:47 P.M. GMT Standard Time,
>>> wb4qda@yahoo.com writes:
>>>
>>> Ray
>>> When I speak into the Micrphone with the mode set to AM ,I modulates
>> up
>>> to 80 watts .Tune is 21 watts and tune then the PWR I get 95 watts
>>> output.
>>> 73
>>> John
>>>
>>>
>>>
>>> ----- Original Message ----
>>> From: "Rsoifer@aol.com"<Rsoifer@aol.com>
>>> To: tentec@contesting.com
>>> Sent: Fri, June 11, 2010 10:38:22 AM
>>> Subject: Re: [TenTec] Orion 2 Firmware 2.044A Released
>>>
>>> John,
>>>
>>> Funny thing about that. With the mode set to AM, when I hit Tune and
>>> then
>>> Pwr I get full output like you did, but if I hit the PTT button
>>> instead,
>>> all I get is 11 watts on the Bird. It worked fine with 2.041XT.
>>>
>>> 73 Ray
>>>
>>>
>>>
>>>
>>> In a message dated 6/11/2010 3:22:43 P.M. GMT Standard Time,
>>> wb4qda@yahoo.com writes:
>>>
>>> Ray
>>> I just tested my O2 on AM max output was 80 warrs on an Alpha watt
>>> meter
>>> also about the same reading on a LP-100A watt meter with the Power set
>>> to
>>>
>>> 100%
>>> using the new fearmware version 2.044A
>>> 73
>>> John wb4qda
>>>
>>>
>>> ----- Original Message ----
>>> From: "Rsoifer@aol.com"<Rsoifer@aol.com>
>>> To: ronc@sonic.net; w5pny@arrl.net; tentec@contesting.com
>>> Sent: Fri, June 11, 2010 8:36:18 AM
>>> Subject: Re: [TenTec] Orion 2 Firmware 2.044A Released
>>>
>>> Ron,
>>>
>>> The NR problem has been fixed (!) but the old low-output problem on
>>> AM
>>> is
>>>
>>>
>>> back. Mine measures 11 watts carrier power, max. It worked fine
>>> with
>>> 2.041XT.
>>>
>>> 73 Ray W2RS
>>>
>>>
>>> In a message dated 6/11/2010 2:17:05 A.M. GMT Standard Time,
>>> ronc@sonic.net
>>> writes:
>>>
>>> I have adjusted the "Wish List" for the Orion II to reflect the
>>> newest
>>> version of the firmware. It's at www.N6IE.com
>>>
>>> Ron N6IE
>>> www.N6IE.com
>>>
>>> ----- Original Message -----
>>> From: "Harry G McGavran Jr"<w5pny@arrl.net>
>>> To:<tentec@contesting.com>
>>> Sent: Thursday, June 10, 2010 5:50 PM
>>> Subject: Re: [TenTec] Orion 2 Firmware 2.044A Released
>>>
>>>
>>>>
>>>> With this one I can set the side-tone level all the way
>>>> up to 65 before the pops begin, and by the time one
>>>> gets past 80 on towards 99 the distortion on the
>>>> side-tone is still really bad -- BUT -- for me at
>>>> least, levels are 50-60 are all I need and that is
>>>> now distortion free, at least with a 610 Hz sidetone
>>>> which is the only one I tested or use. I also am
>>>> using the speaker and not headphones for this.
>>>> Since one gets the side-tone every time the SPOT
>>>> button is used, the side-tone distortion was really
>>>> objectionable with 2.043B.
>>>>
>>>> The NR seems better too, but most all the time I don't
>>>> really need it -- and it's nice not to have artifacts that
>>>> sound like NR action on the side-tone which the side-tone
>>>> is set to 50-60.
>>>>
>>>> There are a few CAT wierdnesses here and there, but the
>>>> reliability
>>>> of sending a strings of "*" commands seems better.
>>>>
>>>> Unless something else crops up, I think I can live with this
>>>> release...
>>>>
>>>> 73 --
>>>>
>>>> Harry, W5PNY
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> --
>>>>
>>>> Harry G. McGavran, Jr.
>>>>
>>>> E-mail: w5pny@arrl.net
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> TenTec mailing list
>>>> TenTec@contesting.com
>>>> http://lists.contesting.com/mailman/listinfo/tentec
>>>>
>>>
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>>
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