Jim, A few further comments on the subject: 1) We were unable to recreate this problem in the lab under any conditions using a cleanly loaded Dell computer and Delta 44 sound card with a radio of the same vintage as yours. 2) I am not aware of any other reports of this specific problem. We were wrong in assuming that this was a generalized problem of interaction. 3) There is clearly an interaction ON YOUR SYSTEM between the ADC data line and the keyer inputs on the parallel port. 4) This interaction could be caused by other software loaded on your computer that deals with the parallel port. It could also be a hardware problem with the computer parallel port. 5) It is possible that there is a hardware failure on the parallel IO circuit on your SDR-1000. We have never seen this before but it could happen if a chip failed.
My suggestion at this point it to try the radio on another computer, preferably one that does not have any software that might modify the parallel port. Thanks, Gerald K5SDR > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of James C Samuels > Sent: Thursday, June 30, 2005 6:43 PM > To: Sami Aintila; Flex Radio > Subject: Re: [Flexradio] Still have CW transmit problems > > > Hi Semi, > Thanks for your input. I tried your suggestion of keying with the > paddles while transmitting a SSB signal and immediately the red "High > SWR" indicator came on and the power fell-off. to 0. Interesting 73, > Jim,W3BG > > > Sami Aintila wrote: > > >Jim, > > > >I don't have the PA, but here's a hardware explanation (or a theory, > >at least). Have you tried providing input to dash/dot lines (i.e. > >squeezing the paddles) while you transmit on SSB? If you experience > >the same kind of power fall-off like on CW, it strongly indicates some > >kind of a hardware problem. > > > >It could simply be the S4/S5 inputs (dash/dot) leaking into the S6 > >(ADC polling) line? I assume the PA unit was factory installed, so the > >D7/D8 diodes on the PIO board ought to be correctly removed, but there > >might be some other mechanism causing this. > > > >But it might as well be software. Really difficult to analyze since no > >one else seems to have the same exact problem. > > > >73, Sami OH2BFO > > > > > > > > > _______________________________________________ > FlexRadio mailing list > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > > >
