> Check and see if the logging software will send a command to > the radio to go into transmit mode. Then you don't have to > worry about RTS, DTR, transistor switches, special wiring or > any of that stuff.
That's a very bad idea. With command based PTT, any RFI on the serial line that causes the "TX OFF" command to be missed will leave the transceiver and amplifier hung in transmit. Also, if you have a computer crash during transmit, you're stuck until you can reboot (or you turn the radio off - if you can while it is in transmit). Finally, although the K3 supports command based TX/RX switching, it is not available in all transceivers. Among the most well known to lack command based switching is the Icom IC-706 line. 73, ... Joe, W4TV > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of [email protected] > Sent: Friday, March 05, 2010 5:39 PM > To: [email protected] > Subject: Re: [Elecraft] N1MM config questions > > > Check and see if the logging software will send a command to > the radio to > go into transmit mode. Then you don't have to worry about RTS, DTR, > transistor switches, special wiring or any of that stuff. > > Buck > k4ia > > In a message dated 3/5/2010 3:29:00 P.M. Eastern Standard Time, > [email protected] writes: > Hi, Steve! > > N1MM can activate the PTT and CW keying lines, but you'll > need to fashion > or > acquire a single-transistor switch (see > http://aa5au.com/rttyinterface.html > for examples) for the DTR and/or RTS lines. I'd create two > switches, one for PTT and another for the CW line. W3YY > also makes a cute little board for this, > http://www.w3yy.com/fsk.htm. The N1MM site also describes this > at > http://pages.cthome.net/n1mm/html/English/Interfacing.htm. > > If you're using a USB to Serial adapter for your RS-232 > keying interface, there may be some "gotchas" depending on > your USB to Serial Adapter. I'm > not > up-to-date on this, but plan to spend a little time with your > breadboard version before committing to use this as your > only technique. > > Some users have reported CW "stuttering" with some computer > OS versions, > which is why a WinKey device is so popular with contesters. > Sometimes the > CW stuttering doesn't occur until late into the contest, when > there's a lot of CPU or disk activity when you log a new > QSO. Minimizing the disk I/O of other programs is essential > if you're trying to send quality CW from a > computer with a time-sharing OS (e.g., all versions of > Windows). Others > have had no trouble at all. > > Your wife insisted that you acquire a K3? What a gem she must be! > > 73 de Dick, K6KR > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Steve Robinson > Sent: Friday, March 05, 2010 12:00 PM > To: [email protected] > Subject: [Elecraft] N1MM config questions > > My lovely bride of almost 32 years has recently insisted > that I buy a K3 > for > my belated birthday present, so I did (what a woman). I am > starting with > the > basic kit that includes the 100 watt amp and 2.8Khz and 400Hz > Inrad 8 pole filters. That is it. Building the kit was a lot > of fun and #3979 is happily on the air. > > So far I have serial communications with N1MM Logger so I > can change frequencies from the TNC or bandmap window. I am > looking for sage advice with respect to keying and audio. I > do have a RIGblaster plus here but can > I > key the rig from the serial cable? So far I have N1MM set > for the proper serial port talking to the K3 at > 38400-N-8-1-1-DTR and RTS Always On. If I can key it with > this cable, I could toss the RIGblaster aside and try some > of the recent audio hints I have read here in the last day > or so, but > please > advise on this too if you can. > > I know I am still pretty unfamiliar with the rig but I hope > to get on any way this weekend when I can. It¹s nice to be > part of this new family. > Thanks > for reading this and thanks in advance! > -- > Steve WU9B > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > 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:[email protected] > > 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:[email protected] > > 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:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
