Message-ID: <4CE9AA76.1050008@usa.net>
Date: Mon, 22 Nov 2010 00:25:42 +0100
From: Alberto di Bene <dibene@usa.net>
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Subject: Re: LF: ROS Latest with I/Q output
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On 11/21/2010 2:41 PM, Andy Talbot wrote:
> /There are plenty of receiver packages for Softrock. clones  and similar - now how about more SDR transmitter software./
Giuliano I0CG and myself presented a working prototype of such a project at the Castelfeder (near Bozen, North-East Italy)
meeting, last October. The PDF of my presentation is here :

http://www.i0cg.com/presentazione_i2phd.pdf

Unfortunately it is in Italian, but with some fantasy and guesswork maybe it can be understood.
Giuliano is the author of the hardware project, while I wrote the DSP software for the dsPIC.

Synthetically, the audio signal coming from the microphone is digitized by the on-board ADC converter of a dsPIC chip at 
a sampling
rate of 15501 Hz, then upsampled to 248,016 Hz, then sent through an SPI interface to an AD-9957 device, which is 
dynamically programmed
to provide an SSB output that can range continuously from about zero up to more than 100 MHz (the final sampling 
frequency is 250 MHz).

It was tested on the air in SSB QSOs with the US on the 20m band, and received unsolicited comments about the very good 
quality
of the modulation.

Some more info on the page of Giuliano  :  http://www.i0cg.com/ad9957_dds.htm

73  Alberto  I2PHD


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    On 11/21/2010 2:41 PM, Andy Talbot wrote:
    <blockquote        cite=3D"mid:AANLkTikre5Z9WLU8Cp_UM+yK5cNjTn4YvK2sMD=
A5XYJw@mail.gmail.com"        type=3D"cite"><i>There are plenty of receive=
r packages for Softrock.
        clones =C2=A0and similar - now how about more SDR transmitter
        software.</i></blockquote>
    Giuliano I0CG and myself presented a working prototype of such a
    project at the Castelfeder (near Bozen, North-East Italy)<br>
    meeting, last October. The PDF of my presentation is here :<br>
    <br>
    <a class=3D"moz-txt-link-freetext" href=3D"http://www.i0cg.com/present=
azione_i2phd.pdf">http://www.i0cg.com/presentazione_i2phd.pdf</a> <br>
    <br>
    Unfortunately it is in Italian, but with some fantasy and guesswork
    maybe it can be understood.<br>
    Giuliano is the author of the hardware project, while I wrote the
    DSP software for the dsPIC.<br>
    <br>
    Synthetically, the audio signal coming from the microphone is
    digitized by the on-board ADC converter of a dsPIC chip at a
    sampling<br>
    rate of 15501 Hz, then upsampled to 248,016 Hz, then sent through an
    SPI interface to an AD-9957 device, which is dynamically programmed
    <br>
    to provide an SSB output that can range continuously from about zero
    up to more than 100 MHz (the final sampling frequency is 250 MHz).<br>
    <br>
    It was tested on the air in SSB QSOs with the US on the 20m band,
    and received unsolicited comments about the very good quality <br>
    of the modulation. <br>
    <br>
    Some more info on the page of Giuliano=C2=A0 :=C2=A0
    <a class=3D"moz-txt-link-freetext" href=3D"http://www.i0cg.com/ad9957_=
dds.htm">http://www.i0cg.com/ad9957_dds.htm</a><br>
    <br>
    73=C2=A0 Alberto=C2=A0 I2PHD<br>
    <br>
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