Got the problem with 160 fixed. I did not solder the pin that turned on the 160 relays in the KPA100.
On the K2IO problem. Here are some voltage measurements that I took. I am not sure that the measurements are correct. I am also looking at the schematic for the K2IO section of the KPA 100. The /K2TX and /K2RX look ok at pin 11 and 12 of U4, the MAX1406. However I am not sure of the voltage at pin 5 and 6 outputs. Could someone clue me in to what the voltages measure on a KPA 100 that is working or a K2IO? I have pinged Gary Surrency on this and am waiting for his reply. On pin 11 and 12 going into the MAX1406 from the K2, I measure 5V when static. I measure -24 VDC on pin 5 and 0 VDC on pin 6 when static. This is with no serial cable connected and the port option turned off. I am pretty sure that the -24 on pin 5 is not good. With the port on and the serial cable connected, I get -5.39 VDC on pin 6 and -24 VDC on pin 5. I have 4.96 VDC on 11 and 12. This is on U4, the MAX 1402. I also get the same measurements at the AUXIO port on either side of the inductors, so I know that they are not open or shorted. It is also worth noting that pin 8, the High Voltage Bias Supply is also at -24VDC. This is the only source getting on to pin 5 that I can find. When I activate the K24U program, the voltage change. I get 3 VDC and 2.5 VAC on pin 11. I also get about the same on pin 12, so it looks like the levels coming from /K2TX and /K2RX are good. I get 3.6 VDC and about 3.1 AC on pin 6. BUT I get -9.86 VDC and 17.8 VAC on pin 5. This would indicate to me that the voltage on pin 5 is way too high and that is why I can send commands to the K2 and get them to work most of the time, and not get any receive data at the PC. The commands that I send from the PC only work part of the time. I have to send and resend to get the rig to do anything. I am also not getting any receive data as far as the displays, VFO, nothing. I have checked all of the cables, wires, inductors at RFC6,7 and 8. I get the same voltage measurements at either side of the chokes mentioned. They all check good with an ohmmeter, so I am assuming that since the voltage is being passed to the serial connector on the output side that all is well. I get 6M Ohm to ground at pin 5, 2.5M ohm to ground at 6. I have 2.87 M ohm to ground at pin 8 and 10M ohm between pin 5 and 8, so it does not really look shorted to me internally. If someone could measure the voltages on a working unit, that would really help me at this point. Jess AE0CW _______________________________________________ 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
