Hallo iam using a icom 718 on 28mhz up to 14mhz have a problem of a high swr reading but the antenna is fine then power drop away
Antenna is fine also put a extra earth on the radio same problem thanks henry
Radio Communications - Icom - IC-718 Base radio, HF, 100W
Answers & Comments
Check the feedline to the antenna, and the antenna itself. High SWR means that power is being reflected back from the antenna. A good discussion of SWR may be found here: http://www.hamuniverse.com/wc7iswr.html
If you antenna is designed for 10M and your are trying to transmit 20M on it, there will be a significant mis-match. You may want to look at installing a better broadband antenna, such as an OCFD that will operate better on multiple bands.