"Yes. At the point for the extension, the signals are RS-232, not USB. You should be able to use a much longer cable if need-be."
Isn't it true that the KAT500 USB cable uses RS-232 protocol but TTL signal levels? TTL may not be as tolerant of length extension as true RS-232. Certainly no problem with about 10 ft extension though as my KAT500 USB/Serial extension is close to that long when my KAT500 is connected to the PC . The KAT500 PC interface is a bit unusual as it seems to be designed to use TLL but also accepts true RS-232 levels with no problem. A true RS-232 receiver may not operate with a single ended TTL input. RS-232 signals swing positive and negative and are only zero volts when the driver is not powered. TTL swings between 0 V and 5 V. RS-232 compliant transmitters are also required to tolerate continuous short circuit without damage. Elecraft was careful not to describe the KAT500 PC port, or the USB cable, as RS-232. These details will only be of interest to anyone considering making a device that interfaces directly with KAT500. 73, Andy, k3wyc ______________________________________________________________ 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
