On Mon, 4 Sep 2006 20:07:38 -0400, Don Wilhelm wrote: >The Rigblaster is capable of controlling PTT from its serial port >connection.
>I don't have a RigBlaster, but I just looked at the schematic >and see that you must have P5 pin 1 jumpered to pin 10 (PSK31 >programs control PTT with the RTS signal), It is shipped with this jumper on only one pin in the default condition. I put it on both - didn't even have to scrounge my jubk box for the jumper! >and you must jumper >P1:B pin 18 to whichever pin you use on your K2 mic jack for PTT >(if your K2 is wired for the Elecraft configuration with mic pin >2 as PTT, you would wire P1:B pin 18 to P1:B pin 25). This is done when one sets up the mike configuration in the RB. >That should allow the RS-232 interface, the Foot switch as well as the front >panel mic input to control the PTT line. Of course, the AUTO/VOX switch >should be in the AUTO position. One other item needs to be noted. In MixW (for those of us who use it), go to Config | TRCVR CAT/PTT and make sure that the serial port used for the RB is specified and enabled and CAT set to "None". When all that was done, everything worked properly. >I don't know how that squares with the Rigblaster instructions, but it is >what their website schematic indicates must be done. It's in there on the last page but it's rather cryptic. The configuration is the one for "PTT on RTS DTR and TXD on KEY" >After looking at the Rigblaster schematic, I am amazed that they >did not include a transformer in the headphone jack to soundcard >connection. What that means is that despite all the >optoisolators used in this unit, the headphone jack connection >negates any other attempts to isolate the computer ground from >the transceiver ground. Now I realize there is yet another >reason for all the hum and noise complaints about the audio when >the Rigblaster is used. I would strongly suggest modifying the >RigBlaster by adding a transformer to break this sneak ground >path - if that is possible in this unit (it may not be due to the >physical ground arrangement). Hmmmmmm <g> I don't think that it's possible because of the way the PCB is laid out. Perhaps the designer for West Mountain Radio could take that into consideration. My RB is fed to the computer through an iMic USB adapter. I don't know if there's any isolation in that, or if an in-line isolation transformer outboard of the RB would do any good. In any event I don't use the headphone jack on the RB. Now to get some QSOs (I've been working a state a day on 40 m in the early evenings.....) <g> C U All on 7070...... -- 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 From a Clearing in the Silicon Forest Beaverton (Washington County) Oregon _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
