I have been messing about with this board for a while, but have not had success hooking it up the rig yet. I downloaded the schematic that Sean produced ... nice job ... and made up a board using the laser toner method described by K7QO. I did see one small issue with the board. The OUT label is actually labeled GND ... a minor oversight. Otherwise the board looks FB.
Two questions about using pin 5 from the microphone header ... Is the ground from the audio out board still used? If so, where does it connect? Also, while I don't use a mic (CW only at this point), if I attach the audio out to pin 5, can I still plug in an Elecraft-wired mic without unplugging the audio out connector from the header? Thanks for any insight... Kevin KK4LSG On Mon, Jan 27, 2014 at 6:51 PM, Don Wilhelm <w3...@embarqmail.com> wrote: > Sean, > > The circuit is simple enough to build on perfboard if you don't want to go > to the trouble of making a board. If you do make boards, you might want to > consider making additional board and offering them for sale. There are > occasional requests for those boards. > > Build the version which lays the components flat on the board and attach > it to the back of the Control Board. That way everything except the audio > output is on the Control Board making the Control Board easy to remove for > servicing - plus it fits easily when the KPA100 is installed. For the > output connection, yes an unused microphone pin is an ideal place (for the > Elecraft microphones, use pin 5). Use a wire that is an adequate length to > allow the Control Board to be removed sufficiently that you can reach the > microphone configuration header on the back of the Front Panel. You can > solder the audio output wire to one of the 'computer' type jumpers that > will plug right into the microphone configuration header - make certain the > 'jumper' is plugged only into the side that is closest to the microphone > jack. > > The only difference between Pauli's (SK) AF take off point and the one I > used is that Pauli's is prior to the muting transistors in the K2 and my > points are after the muting transistors. > If you prefer that the AF not be muted during TX, then you can still > attach to the back of the Control Board at the rear of CB J2 pins 1 and 2 - > and is quite independent of the KDSP2 (or KAF2) option. > > I might add that Pauli did buy one of my boards - I asked him "Why since > he had a wonderful interface already", and he replied that my Fixed Audio > Output board was an easy and simple solution. > > Good luck on getting that license. > > 73, > Don W3FPR > > > On 1/27/2014 6:08 PM, Sean Michael Johnston wrote: > >> Hello All. >> >> I'm a newbie here and about to embark on building a K2. One of the many >> uses I have planned for the radio is to send emails over Winlink 2000 while >> at sea on a sailboat. >> I'd like to communicate with the SignaLink USB sound card through Winmor >> first and then eventually with a PACTOR 3 or 4 modem. >> >> I was thinking of building the fixed audio out designed by W3FPR & NØSS. >> My plan is to fabricate a pcb using the laser printer transfer method. I >> have recreated NØSS's layout as a printable pdf ( >> https://drive.google.com/file/d/0B_D41ceK5uSqM3VGa05BWXBhYkE/ >> edit?usp=sharing), and am thinking I'll run the line out to pin 5 of the >> 8-pin mic connection so I can have a single cable between the K2 and the >> SignaLink. >> >> My question is where is the best point in the K2 to source the AF inputs >> from? Is it cleaner to tap into the control board as is illustrated by >> W3FPR's great instructions (http://www2.opparc.org/ >> mirrors/n0ss/www.n0ss.net/w3fpr_fixed_af_output_for_the_k2_v2r1.pdf), or >> would it be a better signal if I tap into the KDSP2 board as recommended >> by EA3BLQ (http://www.qsl.net/ea3blq/downloads/k2di-pci_const_manual.pdf) >> for his Sound Card Interface? And is this the best way to get a line out >> from the K2, or has there been any newer advancements along those lines? >> >> I realize that I'm building a legacy product here, but from the activity >> I've seen on this mailing list, it's definitely not dead yet. >> >> >> > ______________________________________________________________ > 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 > ______________________________________________________________ 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
