Showing posts with label current. Show all posts
Showing posts with label current. Show all posts

23 Oct 2009

500kHz ATU

Spent half the afternoon going around in circles trying to measure the antenna current since I rebuilt my tiny ATU with a few more taps on the ferrite rod. For reasons I don't understand it was all over the place with my multimeter connected by about 50cms of wire. Instead I built the current meter around a toroid and a small 50uA meter mounted in the ATU and can now repeatably measure the antenna current which is 50mA. With a 5m effective height this is still way below 1mW ERP.