Well, I got my K2 working again. Don't understand why, but it is working fine. My K2 sits on a XV50. I had unplugged the 12V to the XV50 to use the 12V line for the K3. It turns out if I unplug the 12V line to the XV50 I also need to disconnect the RS-232 line between the K2 and XV50, even though the XV50 is not ON. Then the K2 works fine on SSB (it always worked fine on CW).
If the 12V power is plugged into the XV50 the RS232 line does not matter whether it is plugged into either the K2 or XV50 or both. But if the 12V power is removed from the XV50 the RS232 must be removed so the K2 works on SSB. Maybe over a beer I need to look at the schematics to see what this is all about. As always, ideas are welcome. Tnx for all the suggestions. Amazing how much help was offered. How about those Giants! 73, N2TK, Tony _____ From: Don Wilhelm [mailto:[EMAIL PROTECTED] Sent: Saturday, February 02, 2008 5:50 PM To: PA3HGC Cc: N2TK Subject: Re: [Elecraft] K2 - hang up problem Wow, two with the same problem at the same time - that is unusual. You guys will have to take some measurements to guide me in the right direction - right now it seems like the problem is on the KSB2 board, but we need to confirm or deny that. Open the K2 top cover - if a KPA100, lay it on a box to the right of the K2, but leave it connected. Receive with the OP1 filter for now. Then try to create the problem - when it occurs, it is time to take some measurements. Is RXS (U1 pin 21) high (5 to 6 volts)? It should be. Are TXS (U1 pin 15), TXC (U1 pin12), and RXC (U1 pin 22) all low (near zero volts). They should be. If those signals are in the correct state for SSB (or RTTY) receive with the OP1 filter, then the firmware chip on the KSB2 board is doing what it is supposed to. If not, then there is some firmware fault or some signals are not getting from the K2 to the KSB2 board. If the signals are correct and the failure persists, then the task is to follow those signals into the diode switches for the filter and try to find what is bad. It could be an unsoldered or poorly soldered connection. You may want to reflow the solder on all the diodes near the filter and the R-paks too. 73, Don W3FPR PA3HGC wrote: Don, Tony, Get an error message when posting to the Elecraft reflector ("Your IP is in nl, rejected based on geographical location"), so I try to approach you directly. Since last week I have the same problem with my K2 # 703 on all bands, i.e. receive and transmit in CW is perfect, receive in SSB and data modes is okay, only if I push the MH2's PTT key in LSB, USB or data mode and let the K2 go back to receive, the receive signals are much weaker than before (typically from S9 before keying the PTT to S1 afterwards). I can only get back to normal reception by switching bands or by switching the K2 off/on. My control board firmware is 2.03d, and the KSB2 firmware is 1.07. I have already resoldered the sockets of the firmware chips on the control board and the KSB2 adapter and reseated U6 and U1, but the problem persists with both the 10W K2 and the KPA100/KAT100-2 (in EC2 enclosure) attached. Thanks and 73, Gunter PA3HGC W3FPR wrote: Try reseating the firmware chip on the KSB2 board, and if that does not help we can begin looking at various voltages on the KSB2. The signals that switch the filter are RXS, TXS, TXC and RXC. 73, Don W3FPR _______________________________________________ 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
