On 7/16/2013 7:18 AM, Ignacy wrote:
Many tuners add SWR even in bypass because the path through is not 50 Ohm.
Actually, the fundamental cause is that those tuners use the chassis as the signal return, which adds inductance to the path. The switching relays also add inductance. A proper path would be all coax (or another form of transmission line). This doesn't matter much at HF, but it begins to be significant at 6M.
I've measured the KAT500 with a VNA. I don't recall numbers, but the SWR is VERY low at 50 MHz. While adding the capacitor you mention certainly works, there's no need to do this with the KAT500.
73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
