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“2) The TH holds a valid FCC Certification for the unit itself, but it’s unsure that the accessory ATU system is certified for use with it.”
According to the FCC OET test data provided by the manufacturer, Radio Systems, the ATU was certified for use with the Talking House. Both are listed in the OET test data. They both carry the same FCC certification number. The test data describes the system being tested with the ATU connected to the Talking House transmitter with 8 meters of coax.
This was a hot topic some time ago. The dispute mainly focused on where the ATU was mounted for testing. The assertion was the ATU must be mounted within 1 meter of earth. The manufacturer maintains that is false as long as the optional ground connection at the ATU is not used.
The Talking House system is incorporated into the INFOSPOT system provided by Information Station Specialists. I spoke with ISS President William Baker. He maintains the same position regarding installation of the system.
Both ISS and Radio Systems maintain it is legal to elevate the ATU as long as the optional ground connection is not used.