I think I heard that a future FW will have fixed levels for Data modes. I hope I'm right!
...bill nr4c Sent from my Verizon Wireless Droid -----Original message----- From: "Joe Subich, W4TV" <[email protected]> To: [email protected] Sent: Fri, Jul 13, 2012 16:30:40 GMT+00:00 Subject: Re: [Elecraft] Digital Mode Interface for the KX3 for WSJT modes > Given that the KX3 supplied cables only have RXD and TXD signals, > using the serial port to generate PTT requires that either you use 2 > serial ports (one may be the KX3 USB cable and the other can be a > real port or USB to Serial adapter), or provide a "Y" adapter to go > to your interface. Or simply provide a 3.5mm stereo jack on the interface for connection to the KX3 CAT jack. Properly wired, TxD/RxD go to the KX3 while DTR and RTS get split off (in the box) to a pair (or more) of NPN transistors for CW and PTT. The difficulty in dealing with a computer interface for the KX3 is the last of a fixed level audio output and the need to share audio with the operator headphones/speaker. Levels for computer decoding and operator comfort are not always the same <G> which means a buffer/splitter amplifier, external speakers with separate volume control and headphone jack or some other "extra box". 73, ... Joe, W4TV On 7/13/2012 10:12 AM, Don Wilhelm wrote: > Bill, > > You may want to re-think using the serial port on your interface. > > Most data mode applications like to use the same COM port for rig > control (OK, maybe just frequency display) as they use to activate DTR > or RTS for PTT. > > Given that the KX3 supplied cables only have RXD and TXD signals, using > the serial port to generate PTT requires that either you use 2 serial > ports (one may be the KX3 USB cable and the other can be a real port or > USB to Serial adapter), or provide a "Y" adapter to go to your > interface. Use of the "Y" adapter precludes the use of the KX3 USB cable. > > There is nothing wrong with generating PTT from the audio stream, or > just using VOX in the KX3. > > 73, > Don W3FPR > On 7/13/2012 9:51 AM, Bill Conkling wrote: >> I am working on an interface in a box w/pcb. Once you use a box, you can do >> anything. I plan to have full serial port and two audio cables from >> computer. Transformers in the audio chain and a 10K/1k attenuator in mic >> input to KX3. I will split the serial port to provide proper connections >> for CAT, PTT, and CW as n1mm handles the K3. >> >> Whole thing in a 2.5X2.5X1 box. >> >> Big plans.... >> >> ...bill nr4c >> > > ______________________________________________________________ > 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
