User's Manual
PINEAPPLE TECHNOLOGY, INC.
DTC25U Operating and Service Manual
V -- THEORY OF OPERATION
V
. THEORY OF OPERATION (CONTINUED) (Page 2 of 2)
C. LTX Mainframe Power Amplifier
Cabinet - The cabinet is constructed of heavy gauge steel and is very durable. This enclosure is
painted black and is resistive to harsh environment. Standard 19 inch rack mounting.
LTX-D1 Mainframe Assembly - Internal sub-assemblies include the following:
1. DC Power Suppl
y
2. RF Deck
3. Status Monitoring (1A0035)
4. Output Power Detector Board (1A0027)
5. Reflected Power Detector (1A0029) and Shutdown Switch
6. Metering and Monitoring Assembly (1A0300
)
For details of this sections above, see appropriate sections in this manual.
D. BPUD100 Digital Mask Filte
r
The FCC Stringent Mask filter supplied with the DTC25U transcoder is designed to completely
satisfy the FCC Rules for a low power TV transmitter and translator.
This is a closed unit and does not require field adjustment.
E. Optional Low Pass Filte
r
This low pass filter is required and will be supplied with DTC25U translators that operate on
Channels 22 - 24, 32 - 36 and 38 for the specific purpose of providing "out of band" protection to
Radio Navigation Satellite Services.
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