Use DATA-A mode. Normally DATA-A modfe defaults to upper sideband, whereas the convention for RTTY seems to be lower sideband. This means that the RTTY signals wil lappear "inverted" and this may explain why you have problems to decode the RTTY.
The best solution is to select RTTY-reverse in your RTTY program, so that the software will know to invert the signal as it decodes it. Otherwise, it is possible to put the KX3 in DATA-A REV mode in order to invert the signal, but this may cause you problems later if you try to decode other asymetric digital signals (such as MFSK). AFSK-A mode is designed to by used only with RTTY, and uses the KX3 to do narrow DSP filtering, as you have seen. If you want a wider bandwidth, use DATA-A mode, and let your digital mode software do any required DSP filtering itself. In general, USB mode should not be used for digital modes at all (of course it can be made to work, with some caveats like those you already mentioned, but it's generally best to steer clear of it). 73, Matt VK2RQ On 11/06/2013, at 9:12 PM, "IZ4MJP.com" <fra...@iz4mjp.com> wrote: > Hi, > i own a KX3 since June 2012 (one of the first arrived in Italy) . > I mainly use my KX3 in Phone and CW modes. > > Some weeks ago i've bought a SignaLink USB II interface + KX3 cables. > > After the initial setup all worked fine in PSK31 and RTTY but i have some > doubts about the right Mode to use: USB, AFSK A or DATA A > > With AFSK A mode the bandwith is too narrow (the waterfall of MixW shows only > 300 Hz more/less) so is usefull only when i've centered the RTTY signal of > the correspondance. > Not usefull during normal DX operation (IMHO). > > Data A is also OK but i can't decode RTTY (only PSKxx modes). In this Mode i > could narrow the BW but there is no way to decode RTTY correctly. > > USB is the Mode i currently use with RTTY but i think is not the right Mode > for digital communication (i have to manually disable compression and TX Eq. > every time and setup ALC levels). > > I've read and re-read the user manual at Page 18 but i not understand why i > can't decode RTTY. > > So please can someone help me to resolve the problem? > > Another question: is there a way to widen the BandWith in AFSK-A Mode ? (my > display show 0,50 Max). > > My KX3 is equipped of the roofing filters. > > Many thanks for any help. > > 73 > Franco, IZ4MJP > > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
