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When i key up on channel 19 it changes to 00 and 2.1 trying to figure out what this means and if it's good or bad..

The SR-447HPC2 displays your SWR when you transmit. While it's measuring your SWR, it will show 00, and then 2.1 is your SWR. If your SWR gets too high, it will show E4 when you try to transmit. The high SWR feature that prevents you from transmitting and damaging your radio.

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