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RE: [RTTY] KAM Plus and MMTTY

To: rtty@contesting.com
Subject: RE: [RTTY] KAM Plus and MMTTY
From: Richard Ferch <ve3iay@rac.ca>
Date: Sat, 08 May 2004 07:21:38 -0400
List-post: <mailto:rtty@contesting.com>
Dave,

I think Jim's main point is that you cannot use MMTTY to control the KAM; MMTTY's function is to replace the KAM, not to control it. To control the KAM you need other software instead of or in addition to MMTTY.

In more detail: To transmit RTTY, you can use either the KAM or MMTTY, but not both simultaneously. When transmitting, the KAM accepts incoming text on a serial cable, converts it to Baudot and passes the encoded signal to the radio either in audio form (AFSK) or as an FSK keying signal. To use the KAM, Pete needs software to accept input text from the keyboard and send it to a serial port connected to the KAM. MMTTY is not that kind of software; it performs the same functions as the KAM, not the keyboard-to-serial function that Pete needs to control the KAM.

On receive, you can use both the KAM and MMTTY simultaneously, but in parallel, not in series. As Dave has pointed out, simultaneous parallel decoding often gives better results than either the KAM or MMTTY on its own. If you use a Y-connector to present the same audio signal to both the computer's sound card and the KAM, MMTTY can display the decoded text directly on the screen, but to see the text as decoded by the KAM, you need software that will take the text from the KAM's serial cable and display it in another screen window, and MMTTY is not the right software to do that.

If Pete wants to use the KAM together with MMTTY, he needs additional software. As it happens, many of the programs that use MMTTY as an RTTY "engine" can also control a TNC like the KAM, and many of them can use both MMTTY and a KAM simultaneously in dual receive windows. Such software includes N1MM Logger, RCKRtty, WinWarbler and WriteLog.

73,
Rich VE3IAY



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