[Elecraft] KPA500 and KTA AUX Cable/Remote

[Jack Brindle]

Dave;

You do not need the AUX IO cable. You do need to connect the PTT lines from the transceiver to the cat, then from the KAT to the KPA. Both KPA and KAT will work quite well with RF sensing for frequency.

If you wish to add frequency control from the transceiver, you can connect both KPA and KAT to the TS-480 RS-232 stream. Since you are running a remote station, you most likely do not want the KPA to send prompts to the transceiver for the proper data, but rather allow the computer to handle this.

And, yes, the AUX IO pin works quite well to power on and off the KPA. It is essentially in parallel with the front panel button, which means it must be pulsed and not held or the kPA will not complete its power on sequence. The KPA Programming specification details the commands the KPA responds to both in normal operation and while in soft power-down (bootstrap mode). You can power up the KPA either witth the AUX IO power pin or with a serial port command. I believe it is a single character, be sure to check the specification for details.

73!
Jack, W6FB


> On Oct 21, 2019, at 8:43 AM, DAVID INGEBRIGHT <daveingeb at comcast.net> wrote:
> 
> Just assembled the two units and am very pleased with the Elecraft products. My question is since I do not have the KPA and KTA  connected to a K3 (it's a K'Wood TS-480), do I really need the aux cable between the KPA and KTA? Looks like it contains some band info but not sure if the $40 cable is really necessary. But I am also running the setup by remote control (RRC-1258) and I am having to leave the KPA on STBY all the time so I can communicate via the RS232 interface. I see that pin 8 of the AUX connector is a power on pin if you pull it low momentarily. I have a webswitch and have a pair of contacts where I could do this. Has anyone done this? Does it really power off the KPA and power it back on?
> Thanks //Dave WB7ELY
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