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The AMT3000 may work with the TH ATU when the AMT3000 is set up as it must be for the external base loaded antenna. However, coax between the units will not work because it would disturb the L-network scheme for matching the transmitter to the base-loaded antenna. The presence of the extra RF transformer before the tuning coils in the ATU also raises doubt concerning the L-network. The transformer may need to be bypassed.
The AMT5000 would work with the TH ATU with two restrictions. No coax, and the absolute requirement to bypass the ATU RF transformer. However, using the ATU in place of the internal tuning network in the AMT5000 wouldn’t make much sense because it would cause greater losses. The ATU uses small ferrite slug tuned coils which are lossier than the iron powder toroid already built into the AMT5000.
