I had asked Elecraft back in August when I ordered my 1500 about making a longer cable. This was the response back then: Thanks for the contact. To your questions on the AUX cables, you can actually connect 2 of them in series without a problem. This will give you about 6 feet of cabling. We've tested this with our E850463 cables on a KPA500 and it will work, assuming you don't have a problem with RF in the shack at 1500 watts. The limiting factor in extending the AUX cables is that the high-speed, single-wire AUX BUS system we use in the K3/K3S is extended to the KPA1500 so that the amp can 'talk' to the radio. The increased capacitance of the AUX cables are the limiting factor as extender cables are added. So, plan on a maximum of 6 feet or 2 E850463 AUX cables. Now that was back then and I don't know if there has been any more testing or engineering accomplished. I opted for two cables to let me put the amp where I wanted it. I had seen an article about making a longercable for the kpa500 by AD5X. BillK3WJV
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