[Elecraft] K2 KPA-100 5B, 5T 5R
I'm pretty sure I know what 5B, 5T 5R do but what is the trigger, for instance, for setting 5T and 5B high and 5R low prior to transmitting with power over 11W? Is it band specific? The reason for asking is that they're working correctly on 80m but not on 40-10m. They are working correctly in TEST mode on all bands, incidentally. -- View this message in context: http://www.nabble.com/K2-KPA-100-5B%2C-5T---5R-tp14391710p14391710.html Sent from the Elecraft mailing list archive at Nabble.com. ___ 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
Re: [Elecraft] K2 KPA-100 5B, 5T 5R
Bob, Those outputs are controlled by the firmware and as far as I know, they are not band dependent. If you have a band dependency on these signals, look for some other cause - RF in the shack perhaps? A problem with the AUXBUS signal? Is the 8R line from the base K2 being properly received by the KPA100? If the 5T and 5R signals are not correct, then look for a possible problem in the T/R switch. If you have an older KPA100, then the new (past year) T/R switch design should be installed (KPA100UPKT). Just how are they operating - you say only that they are not correct on 40 - 10 meters. 73, Don W3FPR Bob Towers wrote: I'm pretty sure I know what 5B, 5T 5R do but what is the trigger, for instance, for setting 5T and 5B high and 5R low prior to transmitting with power over 11W? Is it band specific? The reason for asking is that they're working correctly on 80m but not on 40-10m. They are working correctly in TEST mode on all bands, incidentally. ___ 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
Re: [Elecraft] K2 KPA-100 5B, 5T 5R
Don Wilhelm wrote: Bob, Those outputs are controlled by the firmware and as far as I know, they are not band dependent. If you have a band dependency on these signals, look for some other cause - RF in the shack perhaps? A problem with the AUXBUS signal? Is the 8R line from the base K2 being properly received by the KPA100? If the 5T and 5R signals are not correct, then look for a possible problem in the T/R switch. If you have an older KPA100, then the new (past year) T/R switch design should be installed (KPA100UPKT). Just how are they operating - you say only that they are not correct on 40 - 10 meters. 73, Don W3FPR Thanks for the quick reply. RF in the shack is unlikely because I've only got as far as running the KPA-100 into a dummy load. The indicated and measured SWR doesn't get worse than 1.1:1 on all bands. The fact that it works up to 100W on 80m tends to rule out an 8R problem. I have noticed that 8R (U1-27) is around 1.22V on 80m (over 11W) and 1.69V on 40 - 10m. Is this significant? Is the AUXBUS signal band dependent? Is the AUXBUS the signal which initiates the switching of the appropriate LPF relays in the K2 and the the KPA-100? 5T (and 5B) should go high when the KPA-100 operates over 11W; conversely 5R should go low. It only happens this way on 80m. On 40-10m over 11W, 5T and 5B remain low (0.0V) and 5R stays high, so the KPA-100 doesn't switch into high power mode. The KPA-100 is less than 6 months old. 73 Bob MM0RKT ___ 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
