Bob, I don't have a KAT100 here to check it, but I can say that how much RYDATA wiggles up and down will depend on what the microprocessor is trying to initially set the relays to - if it happens to be all '1s' the line may always be high during the setting time frame. That data is locked into the shift resisters, so the uP only has to update the settings occasionally. I would expect the front panel data to be updated more frequently and monitoring the FPDATA line is much more likely to show activity.
Sorry I can't help more without having it in my hands. Perhaps Gary can help when he returns to work on Monday. 73, Don W3FPR > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED] > Sent: Saturday, July 23, 2005 2:43 PM > To: [EMAIL PROTECTED]; [email protected] > Subject: Re: [Elecraft] KAT100 signal question > > > Thanks, Don. Actually, I get NO action from ANY relay, although > the LEDs > are switching correctly. I tried to check the signal RYDATA (as > best I could > with no scope, only DMM) and it is an absolutely constant level. > The front > panel signal FPDATA jumps around in value as the signals come through to > activate the LEDs, but RYDATA is dead still. There is 12 v on > the the hot side of > the relays and 5 volts on pins 2 of U2, U3, and U4. With power removed, > RYDATA measures over 5 megs to ground. Any other suggestions? > > 73, > Bob, WO3E > > > >>>> > Bob, > > I would think Q3 is OK since it simply acts as a switch - it does not > produce any voltage. The MCU (U1) pin 39 is the source for voltage on the > drain of Q3, and a high level of somewhere near 5 volts is to be expected. > > Look somewhere else for the problem. It is difficult to see directly > whether the microprocessor is creating the correct output because > it is fed > to the relay drivers as serial data, but the relay driver pins should have > the outputs for the selected relays at a low level, and go to > about 12 volts > on the pins connected to the unselected relays. Check the > schematic sheet 1 > to see which pins correspond to which relays. > _______________________________________________ > Elecraft mailing list > Post to: [email protected] > 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 > -- > No virus found in this incoming message. > Checked by AVG Anti-Virus. > Version: 7.0.338 / Virus Database: 267.9.4/57 - Release Date: 7/22/2005 > -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.338 / Virus Database: 267.9.4/57 - Release Date: 7/22/2005 _______________________________________________ Elecraft mailing list Post to: [email protected] 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
