Mid Band
E5 to E12
175.25 to 224.25
S09 to S38
161.25 to 439.25
High Band
E21 to E69
471.25 to 855.25
(2)
S39 to S41
447.25 to 463.25
(1).
Enough margin is available to tune down to 45.25 MHz.
(2).
Enough margin is available to tune up to 863.25 MHz.
Noise
Typical
Max.
Gain
Min.
Typical
Max.
Low band
: 5dB
9dB
All channels
: 38dB
44dB
52dB
Mid band
: 5dB
9dB
Gain Taper (of-air channels)
: -
-
8dB
High band
: 6dB
9dB
Channel Coverage UV1336:
BAND
CHANNELS
FREQUENCY
RANGE (MHz)
Low Band
2 to D
55.25 to 139.25
Mid Band
E to PP
145.25 to 391.25
High Band
QQ to 69
397.25 to 801.25
Noise
is typically 6dB for all channels.
Gain
is minimum 38dB and maximum 50dB for all channels.
4.
VIDEO SWITCH TEA6415C
In case of three or more external sources are used, the video switch IC TEA6415C is used. The main function of
this device is to switch 8 video-input sources on the 6 outputs.
Each output can be switched on only one of each input. On each input an alignment of the lowest level of the
signal is made (bottom of sync. top for CVBS or black level for RGB signals).
Each nominal gain between any input and output is 6.5dB.For D2MAC or Chroma signal the alignment is
switched off by forcing, with an external resistor bridge, 5VDC on the input. Each input can be used as a normal
input or as a MAC or Chroma input (with external Resistor Bridge). All the switching possibilities are changed
through the BUS.
Driving 75ohm load needs an external resistor.
It is possible to have the same input connected to several outputs.
5.
MULTI STANDARD SOUND PROCESSOR
The MSP 34x0D is designed to perform demodulation of FM or AM-Mono TV sound. Alternatively, two-carrier
FM systems according to the German or Korean terrestrial specs or the satellite specs can be processed with the
MSP 34x0D. Digital demodulation and decoding of NICAM-coded TV stereo sound, is done only by the MSP
3410. The MSP 34x0D offers a powerful feature to calculate the carrier field strength which can be used for
automatic standard detection (terrestrial) and search algorithms (satellite).
6.
SOUND OUTPUT STAGE WITH TDA 7265
TDA7265 is a class AB dual Audio power amplifier assembled in the multiwatt package.
Mute stand-by function of the audio amplifier can be described as the following; the pin 5
(MUTE/STAND-BY) controls the amplifier status by two different thresholds, referred to +Vs. When
Vpin (5) higher than (+Vs - 2.5V) the amplifier is in Stand-by mode and the final stage generators are
off. When Vpin (5) is between (+Vs – 2.5V) and (+Vs – 6V) the final stage current generators are
switched on and the amplifier is in mute mode. When the Vpin (5) is lower than +Vs – 6V the amplifier
is play mode.
