[WT-support] RTTY

[Alessio Sacchi]

Hi Rudy,

I think you should key your IC-7800 through FSK, and receive with your
soundcard.

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.

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.

The RX can be simply achieved with a cable bringing received audio to your
soundblaster.

If you are interested in this solution drop me a mail and I will send you
links and drawings.

Alessio IZ4EFN

2007/9/28, Rudolf Schwenger <rudolf.schwenger at t-online.de>:
>
>  Good evening to the group,
>
> 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).
>
> 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.
>
> 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
>
> (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
>
> (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.
>
> All of this has nothing to do with RFI: Even when outputting 5W only I
> still get the very same results.
>
>
> 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.
>
> 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.
>
> Thanks in advance for any help, which is much appreciated.
>
> vy 73 de Rudy, DJ3WE
>
>
>
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