Axcera CHV400BTD, Technical Manual, Page: 43 / 87

Innovator CHV400BTD ATSC Transmitter System Description
Technical Manual, Rev. 0 39
connected to the combiner will be dissipated by the reject load with the other half of the
power going to the output filters and the antenna. The CHV1500B is made up of a
driver tray, a two way splitter, two CHV750B amplifier trays and a two way combiner
with reject load. The CHV2000B is made up of a driver tray, a three way splitter, three
CHV750B amplifier trays and a three way combiner with reject load. The CHV3000B is
made up of a driver tray, a four way splitter, four CHV1000B amplifier trays and a four
way combiner with reject load. The reject loads in the multi-amplifier systems have
thermal switches connected to them which monitor the temperature of the load and
provide the overtemperature fault, if it occurs, through the system metering board to
the exciter/driver tray.
The On Channel RF output of the amplifier tray either connects directly to the digital
mask filter and low pass filter and then to the antenna in single amplifier systems or to a
combiner, the digital mask filter, low pass filter, output coupler and finally to the
antenna in multiple amplifier systems. The output coupler provides a forward and a
reflected power sample to the system metering board which detects the samples and
supplies the forward and reflected power levels to the exciter/driver tray for use in the
metering circuits.