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From: Markus Vester <markusvester@aol.com>
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Date: Mon, 21 Jan 2013 07:22:07 -0500 (EST)
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 Content preview:  I have recently aquired a couple of cheap AD9850 DDS boards,
    and found that it is possible to control them directly from the PC through
    RS-232 handshake lines (RTS, DTR, TXD) without any additional hardware. This
    can be used as a simple means to generate WSPR RF signals without a linear
    SSB exciter. ? Details regarding the boards and interfacing format were found
    on? http://www.theladderline.com/inexpensive-ad9850-dds-boards-ebay#comment-195
    ? Five short wires connect the 9-pin RS232 to the "lower" row on the AD9850
    board, with the 5V supply tapped directly off the USB device. http://df6nm.bplaced.net/wspr/ad9850/ad9850_at_rs232.jpg
    ? ?(*)? 5V = Vcc?? (1) ?(4) rts = clock (2) ?(3) txd = latch (3) ?(7) dtr
    = data? (4) ?(5) gnd = reset, gnd (5,6) ? As the USB-to-Serial converter
   has only low current outputs, the internal clamping diodes? provide adequate
    voltage limiting at the digital inputs. To configure the AD9850 for serial
    protocol, additionally pins D0 (2) and D1 (3) on the "upper" row have to
   be be connected to Vdd (1), and D2 (4) to gnd (10). ? I have uploaded software
    and sourcecode to http://df6nm.bplaced.net/wspr/ad9850/ddswspr.zip (77k)
   In addition to a basic frequency setting utility (serdds.exe), there is also
    a WSPR transmit program (ddswspr.exe) which allows you to generate WSPR at
    different speeds. BTW The latter can alternatively be used to generate wspr
    with a FE-5680A Rubidium synthesizer (/rb option). ? As the onboard 125 MHz
    sources seem to deviate by several kHz it is useful to calibrate the frequency
    and edit ddsref.txt. Frequency stability is adequate but not very good, my
    units exhibited a warmup drift of about 2 ppm. ? Hope this may be useful.
    ? Best 73, Markus (DF6NM) [...] 
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Subject: LF: AD9850 controlled by RS-232
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I have recently aquired a couple of cheap AD9850 DDS boards, and found that=
 it is possible to control them directly from the PC through RS-232 handsha=
ke lines (RTS, DTR, TXD) without any additional hardware. This can be used =
as a simple means to generate WSPR RF signals without a linear SSB exciter.
?
Details regarding the boards and interfacing format were found on?=20
http://www.theladderline.com/inexpensive-ad9850-dds-boards-ebay#comment-195
?
Five short wires connect the 9-pin RS232 to the "lower" row on the AD9850 b=
oard, with the 5V supply tapped directly off the USB device.
http://df6nm.bplaced.net/wspr/ad9850/ad9850_at_rs232.jpg
?
?(*)? 5V =3D Vcc?? (1)
?(4) rts =3D clock (2)
?(3) txd =3D latch (3)
?(7) dtr =3D data? (4)
?(5) gnd =3D reset, gnd (5,6)
?
As the USB-to-Serial converter has only low current outputs, the internal c=
lamping diodes? provide adequate voltage limiting at the digital inputs. To=
 configure the AD9850 for serial protocol, additionally pins D0 (2) and D1 =
(3) on the "upper" row have to be be connected to Vdd (1), and D2 (4) to gn=
d (10).
?
I have uploaded software and sourcecode to
http://df6nm.bplaced.net/wspr/ad9850/ddswspr.zip (77k)
In addition to a basic frequency setting utility (serdds.exe), there is als=
o a WSPR transmit program (ddswspr.exe) which allows you to generate WSPR a=
t different speeds. BTW The latter can alternatively be used to generate ws=
pr with a FE-5680A Rubidium synthesizer (/rb option).
?
As the onboard 125 MHz sources seem to deviate by several kHz it is useful =
to calibrate the frequency and edit ddsref.txt. Frequency stability is adeq=
uate but not very good, my units exhibited a warmup drift of about 2 ppm.=
=20
?
Hope this may be useful.
?
Best 73,
Markus (DF6NM)


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Content-Transfer-Encoding: quoted-printable
Content-Type: text/html; charset="us-ascii"


<div style=3D"FONT-FAMILY: arial; COLOR: black; FONT-SIZE: 10pt">I have rec=
ently aquired a couple of cheap AD9850 DDS boards, and found that it is pos=
sible to control them directly from the PC through RS-232 handshake lines (=
RTS, DTR, TXD) without any additional hardware. This can be used as a simpl=
e means to generate WSPR RF signals without a linear SSB exciter.</div>


<div>&nbsp;</div>


<div>Details regarding the boards and interfacing format were found on&nbsp=
; <br>
<A href=3D"http://www.theladderline.com/inexpensive-ad9850-dds-boards-ebay#=
comment-195">http://www.theladderline.com/inexpensive-ad9850-dds-boards-eba=
y#comment-195</A></div>


<div>&nbsp;</div>


<div>Five short wires connect the 9-pin RS232 to the "lower" row on the AD9=
850 board, with the 5V supply tapped directly off the USB device.<br>
<A href=3D"http://df6nm.bplaced.net/wspr/ad9850/ad9850_at_rs232.jpg">http:/=
/df6nm.bplaced.net/wspr/ad9850/ad9850_at_rs232.jpg</A></div>


<div>&nbsp;</div>


<div>&nbsp;(*)&nbsp; 5V =3D Vcc&nbsp;&nbsp; (1)<br>
&nbsp;(4) rts =3D clock (2)<br>
&nbsp;(3) txd =3D latch (3)<br>
&nbsp;(7) dtr =3D data&nbsp; (4)<br>
&nbsp;(5) gnd =3D reset, gnd (5,6)</div>


<div>&nbsp;</div>


<div>As the USB-to-Serial converter has only low current outputs, the inter=
nal clamping diodes&nbsp; provide adequate voltage limiting at the digital =
inputs. To configure the AD9850 for serial protocol, additionally pins D0 (=
2) and D1 (3) on the "upper" row have to be be connected to Vdd (1), and D2=
 (4) to gnd (10).</div>


<div>&nbsp;</div>


<div>I have uploaded software and sourcecode to<br>
<A href=3D"http://df6nm.bplaced.net/wspr/ad9850/ddswspr.zip">http://df6nm.b=
placed.net/wspr/ad9850/ddswspr.zip</A> (77k)</div>


<div>In addition to a basic frequency setting utility (serdds.exe), there i=
s also a WSPR transmit program (ddswspr.exe) which allows you to generate W=
SPR at different speeds. BTW The latter can alternatively be used to genera=
te wspr with a FE-5680A Rubidium synthesizer (/rb option).</div>


<div>&nbsp;</div>


<div>As the onboard 125 MHz sources seem to deviate by several kHz it is us=
eful to calibrate the frequency and edit ddsref.txt. Frequency stability is=
 adequate but not very good, my units exhibited a warmup drift of about 2 p=
pm. </div>


<div>&nbsp;</div>


<div>Hope this may be useful.</div>


<div>&nbsp;</div>


<div>Best 73,<br>
Markus (DF6NM)<br>
</div>

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