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
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