I have baby loop antenna. I'm noticing SWR discrepancy between SWR shown on ATU display vs. what my Icom SWR meter shows. For example, ATU will display SWR of 1.3 but my Icom transceiver will show SWR of more than 2. When this happens transceiver power output is automatically reduced. ATU is connected to radio and then to antenna as per installation guide. There are no other devices or antenna tuners connected. Antenna tuner on the transceiver is turned off.
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FT8 works fine for me. This means that I do not have large SWR variations over the entire band (3Khz). When I work in LSB mode at 40 meters, the SWR remains fairly constant after several tunning attempts. What is strange is that the ICOM 7410 Frequently reducing the power back to 0 watts. I have no problems with an EndFed antenna.
I do not understand why the power is reduced to 0 watts while the SWR 1.5: 1 and ICOM modulates very well.
Can someone answer this question.
73 Gerard