User's Manual

Innovator CHV400BTD ATSC Transmitter Board Descriptions
Technical Manual, Rev. 0 58
through a directional coupler U6 to J2, the RF output jack of the board. The directional
coupler provides an RF sample at J4 that is used by an external overdrive protection
circuit located on the (A6-A3) ALC Board. The output of the pre-driver amplifier
assembly at J2 connects to the RF Input connection on the (A6-A2) 100W Amplifier
Pallet, Italmec.
(A6-A2) 50 Watt Amplifier Pallet, Italmec (1313484)
The 50 Watt Amplifier Pallet, Italmec is made by Italmec for Axcera’s use. This
broadband amplifier operates in the frequency range of 170 to 240 MHz. The amplifier
is capable of delivering a maximum output power of 25 Watts digital, with an
amplification factor of approximately 24 dB. The RF output of the pallet is wired to J2
the RF output jack of the 20W driver amplifier assembly. The output of the 20W driver
amplifier assembly is cabled to the J1 on (A7) the output metering detector board
(1313747).
(A6) 200 Watt Driver Amplifier Assembly (1313912) – Used in the CHV200B
The (A6) Amplifier Assembly (1313912) is made up of (A6-A1) the 50 Watt Amplifier
Pallet, Italmec (1313484) and (A6-A2) the 500 Watt Amplifier Pallet, Italmec (1313581).
The ALC Board (1308570) is also part of this assembly. The assembly has
approximately 36 dB of gain.
(A6-A1) 50 Watt Amplifier Pallet, Italmec (1313484)
The 50 Watt Amplifier Pallet, Italmec is made by Italmec for Axcera’s use. This
broadband amplifier operates in the frequency range of 170 to 240 MHz. The amplifier
is capable of delivering a maximum output power of 25 Watts digital, with an
amplification factor of approximately 24 dB. The RF output of the pallet is wired to J2
the RF output jack of the 20W driver amplifier assembly. The output of the 20W driver
amplifier assembly is cabled to the RF input connection on (A6-A2) the 500 Watt
Amplifier Pallet, Italmec.
(A6-A2) 500 Watt Amplifier Pallet, Italmec (1313581)
The 500 Watt Amplifier Pallet, Italmec is made by Italmec for Axcera’s use. This
broadband amplifier operates in the frequency range of 170 to 240 MHz. The amplifier
is capable of delivering a maximum output power of 200 Watts digital, with an
amplification factor of approximately 25 dB. The RF output of the pallet is wired to J2
the RF output jack of the 200W driver amplifier assembly. The output of the 200W
driver amplifier assembly is cabled to the J1 on (A7) the output metering detector board
(1313747).
(A7) Output Metering Detector Board (1313747)
The (A7) Output Detector Board provides forward (2V=100%) and reflected (2V=25%)
power samples to the CX Control Board for metering and monitoring purposes. R7 is the
reflected power calibration pot and R23 is the forward power calibration pot. A Forward
power sample, -10 dBm, connects to J4 (-10 dBm typical) on the board, which is cabled
to the front panel sample jack of the tray. The RF output of the board will vary
depending in which system it is located, is at J2, which is cabled to J9 the RF Output
Jack of the amplifier tray.