"High SWR" is above 2:1 on the radio indicator, which is the point where the radio (looking through the standby amp ) starts to want to go into "protect mode" by decreasing the power output.
I have a 50 ohm non-radiating "Cantenna" that tell me that all the bands on the radio are O.K.
On all the other bands that I use the tuner on, the SWR meter in the radio will correspond to the SWR on the external meter. "Something" that "I" am not seeing causes my radio NOT to want to tune on the 40 meter band.
I need some new "Coax and Antenna" grease, the 40 meter portion of mine has worn off, you know what i mean? :-?