Mid Band 161.25 to 439.25 High Band 447.25 to 463.25
E5 to E12
175.25 to 224.25
S09 to S38
E21 to E69
471.25 to 855.25 (2)
S39 to S41
(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
Low band Mid band High band
Typical Max. : 5dB 52dB : 5dB 8dB : 6dB
Max. 9dB 9dB 9dB
Gain
All channels Gain Taper (of-air channels)
Min. : 38dB : -
Typical 44dB -
Channel Coverage UV1336: BAND CHANNELS FREQUENCY RANGE (MHz) 55.25 to 139.25 145.25 to 391.25 397.25 to 801.25
Low Band Mid Band High Band
2 to D E to PP QQ to 69
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.
