On Tue, Jun 19, 2018 at 10:55 AM, Earl <n...@suddenlink.net> wrote: > Presently I have the K3/KPA500/KAT500 in line with the AUX Cable connected > to a N6TV Y-BOX. > > I now have the KPA1500 connected to the Y-BOX also. All looks good. > > Presently the KPA500 powers on when the K3 is turned on. > > Is there a setting, that I can't find, to not have the KPA500 turn on > automatically. >
Hi Earl, It looks like you ordered a v1.3 Y-BOX, so all 15-pins of all five connectors are wired parallel. Pin 8 is the "Power On" pin. Pulsing that pin low will cause a KPA500 or KPA1500 amplifier to power up. Powering up the K3 could cause such a pulse if you have the wrong cable connected between things. Pin 8 of the KPA1500 and KPA500 could also be connected in parallel to each other. Solution: use an Elecraft AUX cable, not a 15-pin cable or VGA monitor cable, between the Y-BOX, the KAT500, and the KPA1500. This cable has no connection on the power on pin. The recommended way to correctly connect these devices together would be: K3 ACC Port -> 15 pin M/M cable -> Y-BOX input Y-BOX v1.3 Output 1 -> Elecraft M/F AUX cable -> KAT500 -> 15 pin M/F cable (or another AUX cable) -> KPA500 Y-BOX v1.3 Output 2 -> Elecraft M/F AUX cable -> KPA1500 Y-BOX v1.3 Outputs 3/4 -> Other devices (Band Decoder, MK2R+, RemoteRig etc.) Some Elecraft AUX cables were modified to short Pin 11 (DIGOUT1) to Pin 8 to allow for remote power on. If you bought the cable second-hand, it may have been modified to do that. FYI, for Y-BOX v2.1 (upgrades available), only one Elecraft AUX cable would be needed to connect all three devices (KAT500, KPA500, KPA1500), because the new Y-BOX v2.1 has one dedicated "AMP AUX" port, which by default has no connection in pins 1, 4, 6, 7, and 8, same as the AUX cable). So it can be wired like this: K3 ACC Port -> 15 pin MM cable -> Y-BOX input Y-BOX v2.1 AMP AUX Output -> 15 pin M/F cable -> KAT500 -> 15 pin M/F cable -> KPA500 Y-BOX v2.1 Output 2 -> Elecraft M/F AUX cable -> KPA1500 Y-BOX v2.1 Outputs 3/4 -> Other devices (Band Decoder, MK2R+, RemoteRig etc.) 73, Bob, N6TV https://bit.ly/Y-BOX ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
