Wayne, Sorry for the delayed response. What seems to be missing from the KPA1500, compared to the Alpha 87A, is a keying OUTPUT on an RCA phono jack. If it's too late to add another jack to the KPA1500, perhaps the REM jack could be reprogrammed via firmware to do this function, instead of remote power on? Note that it also has to work when the amplifier is OFF.
From the Alpha 87A manual: "KEY OUT – Provides a pull-down to ground (through 47 ohm resistor) which follows the line connected to the RELAY jack when the amplifier is ON and in OPERATE condition. When the 87A is in STANDBY or OFF, KEY OUT is directly connected to the RELAY jack by a closed relay contact in the amplifier. Useful for special T/R hook-ups when amplifier is used with exciters having poor T/R sequencing." Some folks have to send keying input to the amplifier, and let the amplifier key the radio, to prevent hot switching. It may also be useful in SO2R lockout systems. In my shack, I currently wire two of these connectors in parallel (from two amps) into a simple RCA Y-cable to a pre-amplifier's power disconnect line on a Pixel Loop. Grounding this line on either amplifier will then remove power from the antenna-mounted pre-amp whenever I transmit. The power coupler is a Clifton Labs Z1203B which is 100% compatible with the Pixel Loop, but it operates silently at QSK speeds (unlike the original Pixel power coupler which has a noisy relay). 73, Bob, N6TV On Thu, Jun 8, 2017 at 4:23 PM, Wayne Burdick <n...@elecraft.com> wrote: > The KPA1500 has very flexible I/O, and plenty of space for adding new > control features in firmware. I/O ports include Ethernet, USB, RS-232, K3 > Accessory connector (including Icom band voltages), AH-4, CI-V, keying > input (PTT), ALC out, and remote power-on. > > In order to prioritize our efforts towards the facilitation of remote > control and interfacing, we’d like to hear from those considering how they > might integrate a KPA1500 into their station. Please describe both > third-party and home-built gear that you might be using. In what situations > could the KPA1500 itself simplify setup or operation? > > I can’t promise we’ll be able to respond to every question or suggestion, > but we’ll keep all of your input for our internal discussions. > > 73, > Wayne > N6KR > > ______________________________________________________________ > 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 n...@arrl.net ______________________________________________________________ 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
