First, I agree with Greg that there is a better alternative to VOX that doesn't require any additional hardware. Configure either RTS or DTR on your radio port in N1MM Logger for PTT and make the corresponding choice in the K3's CONFIG: PTT-KEY menu item.
As for FSK vs. AFSK, with the K3 there appears to be no difference as far as performance is concerned. The differences are simply in the way you interface the radio to the computer and the way you configure the MMTTY software to transmit. If you already have a device or interface that does FSK keying (e.g. a TU like the PK-232 or a microKeyer with the appropriate cables for the K3), then the choice is between using an audio patch cable to the K3's LINE IN jack for AFSK or a keying cable to the ACC connector for FSK. If you do not have an external FSK keying device with the necessary cables you will probably find AFSK easier to hook up than FSK. For AFSK all you need is an audio patch cable. For FSK you will need an extra serial port on the computer as well as a keying circuit (one transistor) to convert the keying signal from RS-232 to TTL voltage levels. As regards software configuration, if you are using MMTTY you may find it slightly easier to configure MMTTY to transmit using AFSK than FSK. With FSK there is also a possibility that you will need to configure the K3's FSK polarity setting to get the transmit polarity correct. Bottom line: if you have a PS-232, go ahead and use it for FSK. If you do not, AFSK is the simpler choice. 73, Rich VE3KI Dave Wilburn wrote: > I'm in the process of picking up a PK-232, primarily for EmComm / > Pactor 1. I'm not intending to start a passionate discussion between > FSK / AFSK, but had a question. > > I have been running AFSK since I received my K3 last March. It has > worked well, but it is the only RTTY I have known. I have seen the > reason given for running FSK vs. AFSK as the ability to use the > radio's filters. That is a moot point in the K3. > > I also understand that when using FSK, it is a different distribution > of resources. I have MMTTY running with N1MM (when I am contesting), > and MMTTY triggers the radio via VOX. This has the annoyance that > when I click on a SSB spot, then a noise in the shack triggers the VOX > kicks in and causes feedback. > > Now to my question. If I am happy with how the RTTY is performing now > using AFSK, what is the incentive to setup for FSK? > _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
