Hi Ed, Yes, you can use your K3USB cable to gain access to the RTS line, but you would have to select the optional KXSER cable (no charge exchange) to mate it to your KX3. Apparently there is space inside that DB9 connector to mount a small resistor and 2N2222 to change the HIGH RTS line to a short that can be applied to the PTT ring in the mic connector.
The GPIO approach will require a firmware change, and would require you to break out the RTS line anyway, and then splice into another connector too....I am sure there are others interested in doing this. I THINK this might be the easiest way, although perhaps it would be possible to add another stereo jack next to the mic connector to short for PTT....will have to see what the space issues look like inside the unit. GL and VY 73, Lance GL and VY 73, Lance On 3/6/2012 9:02 AM, Edward R. Cole [via Elecraft] wrote: > Following this thread with Lance, carefully. I'm not sure I will run > eme with my KX3 but will probably run WSJT on the 600m band. My 600m > transmitter uses a P&B dc relay for TR so need more delay. Can I not > use my K3USB cable and tap out the RTS line (DB9 pin7) to control the > GPIO line to accomplish PTT with sw control? Will use of the GPIO > line require special changes to the firmware to accomplish PTT? > > Most soundcard sw utilize RTS for PTT, so this issue is not limited > to just WSJT. > > 73, Ed - KL7UW > ------------------------------ > > Message: 14 > Date: Mon, 05 Mar 2012 14:13:32 -0500 > From: Don Wilhelm <[hidden email] > </user/SendEmail.jtp?type=node&node=7347846&i=0>> > Subject: Re: [Elecraft] Elecraft KX3 Owner's Manual now available > (*preliminary*) > To: [hidden email] </user/SendEmail.jtp?type=node&node=7347846&i=1> > Cc: Elecraft Mailing List <[hidden email] > </user/SendEmail.jtp?type=node&node=7347846&i=2>> > Message-ID: <[hidden email] </user/SendEmail.jtp?type=node&node=7347846&i=3>> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Lance, > > You should not need another USB cable, but use the KXSER cable (and a > USB to serial adapter if needed) which will give you access to the RTS > and DTR pins of the serial port. > Yes, you will have to add the wires to the existing KXSER cable. > > 73, > Don W3FPR > > > > > 73, Ed - KL7UW, WD2XSH/45 > ====================================== > BP40IQ 500 KHz - 10-GHz www.kl7uw.com > EME: 50-1.1kw?, 144-1.4kw, 432-QRT, 1296-?, 3400-? > DUBUS Magazine USA Rep [hidden email] > </user/SendEmail.jtp?type=node&node=7347846&i=4> > "Kits made by KL7UW" http://www.kl7uw.com/kits.htm > ====================================== > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] </user/SendEmail.jtp?type=node&node=7347846&i=5> > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > > ------------------------------------------------------------------------------------- > If you reply to this email, your message will be added to the discussion > below: > http://elecraft.365791.n2.nabble.com/Elecraft-KX3-Owner-s-Manual-now-available-tp7344179p7347846.html > > > To start a new topic under Elecraft, email > ml-node+s365791n365791...@n2.nabble.com > To unsubscribe from Elecraft, click here > <http://elecraft.365791.n2.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=365791&code=dzdnakBxLmNvbXwzNjU3OTF8OTMyNDMwOQ==>. > NAML > <http://elecraft.365791.n2.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml> > > -- Lance Collister, W7GJ (ex WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX, 3D2LR, 5W0GJ) P.O. Box 73 Frenchtown, MT 59834-0073 USA TEL: (406) 626-5728 QTH: DN27ub URL: http://www.bigskyspaces.com/w7gj Windows Messenger: w...@hotmail.com Skype: lanceW7GJ 2m DXCC #11/6m DXCC #815 Interested in 6m EME? Ask me about subscribing to the Magic Band EME email group, or just fill in the request box at the bottom of my web page (above)! -- View this message in context: http://elecraft.365791.n2.nabble.com/Elecraft-KX3-Owner-s-Manual-now-available-tp7344179p7348157.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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
