Or just buy one of these: http://www.unifiedmicro.com/sci6.htm
Hard to beat for $25.00. BTW....I have a brand new one for sale, already assembled, never used. Will sell for $20.00 including shipping to the lower 48 states. Note this is NOT set up for the KX3...strictly stock using the supplied connectors/cables. On 7/12/2012 7:50 PM, Edward R. Cole wrote: > Don, > > After making several sound-card interfaces (never have used a > commercially made one), I deduced the "surest way" to avoid audio > problems was by total isolation of computer ground and radio > ground. East to accomplish using isolation transformers for audio > and opto-isolators for dc controls. > > I guess there are applications for a "VOX-like" PTT control, but I > use RTL or DTR lines for this with the sw I run. Opto-isolator like > the 4N36 work well in this path. > > I am going to go ahead making up an I/F with tiny pcb transformers, > but probably not try installing all inside a sub-D > connector (commonly called DB-9 or DB-25). I will use a tiny > plastic box and small pc board with mini-phone connectors for audio > and DB-9 for RS-232 interface. I have in mind that it will attach on > the back of the KX3 with a velcro-patch (so one can remove it at will). > > I am just stacked up at present so this will not be worked on > right-away (assuming Lance has one for his eme dxpedition). > > I am writing a power-point presentation to demo the KX3 this > weekend. I'll add it to my website afterward. > > 73, Ed - KL7UW > > At 02:49 PM 7/12/2012, Don Wilhelm wrote: >> Thanks, yes that is the one that produces the PTT from the audio stream. >> I note that Skip no longer has kits and boards, but he has supplied >> a complete parts list and the circuit is simple enough to wire on >> perfboard. The photos provide a nice layout guide. >> >> Contrary to K9YC's statements, I believe the transformers are >> necessary for use with a laptop. >> Jim's "bond everything together" is a great solution (and it works) >> for the home station using a desktop computer, but bonding the >> computer becomes more difficult when using laptops with all plastic >> cases. I cannot find a good place to connect to the computer ground >> of my IBM Thinkpad.unless it just happens to be the jackscrews on >> the VGA connector - but those are there to prevent connector >> pullout, and may or may not be grounded. (I use a desktop at the >> home station). >> >> 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 [email protected] > "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:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > -- 73, Gary K9GS Greater Milwaukee DX Association: http://www.gmdxa.org Society of Midwest Contesters: http://www.w9smc.com CW Ops #1032 http://www.cwops.org ************************************************ ______________________________________________________________ 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
