John ya kinda lost me on that one. How does an internal ATU help a external linear to tune a match to the antenna. On the other subject I have had a LDG 1KW tuner for a long time. For the first couple yrs when it was told to tune it rattled and rattled many times to try and tune. A couple yrs ago I read about their new firmware chip to improve the tune time and add a bunch of freq tune match storage capacity. I bought the chip and what a difference. It since tunes pretty fast , it does only a quick rattle and if it's a previous used freq it just goes click and it's there. Hope their routines for this tuner are similar to the 1kw model I use it to tune my shorty dipoles on the boat after my ameritron 600 watt solid state amp. Duffy NA6MM
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