Hi Rudy,<br><br>I think you should key your IC-7800 through FSK, and receive with your soundcard.<br><br>I don't know your radio, but consider that if you have good cw filters, you will be able to use them in RTTY mode, and help the decoding algorithm doing a good job.
<br><br>Please check on the manual if you have a straigth FSK RTTY connector on the rear of your rig. In this case, you could let your 7800 do the TX job through a simple serial or parallel port interface.<br><br>The RX can be simply achieved with a cable bringing received audio to your soundblaster.
<br><br>If you are interested in this solution drop me a mail and I will send you links and drawings.<br><br>Alessio IZ4EFN<br><br><div><span class="gmail_quote">2007/9/28, Rudolf Schwenger <<a href="mailto:rudolf.schwenger@t-online.de">
rudolf.schwenger@t-online.de</a>>:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div bgcolor="#ffffff">
<div><font face="Arial" size="2">Good evening to the group,</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">Is there anybody out there who would be kind enough
to help me to choose the correct settings for RTTY. I get lost trying to
configure MMTTY, microKEYER/USB-Device Router, WinTest and the IC-7800 with the
intent to copy and transmit clean FSK (not AFSK).</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">By far the best reception of FSK is by means of the
built-in Decoder of the IC-7800. There is also no problem at all to transmit
clean FSK by using the IC-7800 as a stand alone Radio with a keyboard connected
to it. Although this setup works perfectly alright for random QSOs it is of
course a hopeless proposition if one wants to take part in an RTTY contest: No
auto-numbering, no logging, no comfort at all.</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">The best I could achieve so far - using the
combination of WinTest V 3.14, USB Device Router V. 4.0.10, and an unknown
version of MMTTY (app. 2 years old) - is the following</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">(a) RTTY-reception clearly worse than with the
built in decoder of the IC-7800, i.e. I need stronger signals with less
qrm/qrn to read a clear message</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">(b) if I press the F1-key for CQ for the first
time, the radio seems to send the correct CQ-message. If I press it thereafter a
second or third time I only hear diddles with an occasional burst of RTTY-info.
The same is true for all other F-keys: First time they seem to perform ok,
thereafter only diddles with occasional bursts of RTTY.</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">All of this has nothing to do with RFI: Even when
outputting 5W only I still get the very same results.</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">Since I would like to participate at least for some
hours in the forthcoming CQ WWDX RTTY contest I wonder whether there is anybody
out there with a similar setup, who would be willing to share with me his
MMTTY-, WinTest- and microKeyer/USB-Device-Router settings for perfect
RTTY.</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">I know that I could deal with the subject by
changing over to AFSK. That worked ok for me about a year ago - but only in very
low qrm-level environments, i.e. not in contests. In other words I would like to
make use of the excellent selectivity of the IC-7800 by using FSK rather than
AFSK.</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">Thanks in advance for any help, which is much
appreciated. </font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">vy 73 de Rudy, DJ3WE</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2"></font> </div></div>
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