A07B500S manual
Pag. 24
All the rules concerning the radio transmitters in FM band include some limits of accuracy and
stability of the output frequency. These limits usually depend on parameters of internal crystal
reference, which are at the same time connected firstly to the temperature and ageing of the crystal
itself. For this reason the crystal have high performance and guarantees a considerable thermal
stability, however a frequency correction due to ageing is easily implemented just manually.
The present screen shot allows a very fine adjustment of the frequency value assigned to the radio
station without the need to open the transmitter. By entering a correction factor between 0 and 255,
the transmitter frequency can be corrected with a 20Hz step only; this operation can be performed
during the normal periodical check of the transmitter or, as it is shown below, through a remote
telecontrol ( modem , GSM ).
By entering the new correction value, it’s possible to reach a 2KHz offset in comparison to the
central value.
4.6.12
PAGE UP for a new screen shot :
In this case it’s possible to insert the pre-emphasis or to set the transmitter from mono to stereo and
vice versa.
The pre-emphasis value (50 or 75µs) is switched by a jumper placed on the rear window of the rack.
The pre-emphasis operates on the LEFT and RIGHT channels only.
By choosing the STEREO option, the LEFT and RIGHT channels are encoded with the stereo
subcarrier addition, from which it’s possible to get a synchronism in the IN/OUT rear connector
(1Vpp sine wave).
Summary of Contents for A07B500S
Page 15: ...A07B500S manual Pag 15 A07B500S TRANSMITTER BLOC DIAGRAM...
Page 16: ...A07B500S manual Pag 16 A07B500S POWER SUPPLY BLOC DIAGRAM...
Page 27: ...A07B500S manual Pag 27...
Page 34: ...A07B500S manual Pag 34...
Page 42: ...A07B500S manual Pag 42 ADJUSTMENT4 6 1 Module PWN PW500 power supply...
Page 46: ...A07B500S manual Pag 46...
Page 68: ...A07B500S manual Pag 68 fig 9a...
Page 69: ...A07B500S manual Pag 69 fig 9b...
Page 70: ...A07B500S manual Pag 70 fig 9c...
Page 73: ...A07B500S manual Pag 73 fig 9c...
Page 74: ...A07B500S manual Pag 74 DIAGRAMS AND LAYOUTS...
Page 75: ...A07B500S manual Pag 75 PWN BOARD POWER SUPPLY...
Page 76: ...A07B500S manual Pag 76 PWN BOARD POWER SUPPLY...
Page 79: ...A07B500S manual Pag 79 AUDIOIN BOARD AUDIO INPUTS...
Page 80: ...A07B500S manual Pag 80 AUDIOIN BOARD AUDIO INPUTS...
Page 81: ...A07B500S manual Pag 81 AUDIOIN BOARD AUDIO INPUTS...
Page 85: ...A07B500S manual Pag 85 LCDP BOARD DISPLAY DRIVER...
Page 86: ...A07B500S manual Pag 86 LCDP BOARD DISPLAY DRIVER...
Page 90: ...A07B500S manual Pag 90 MBP BOARD MOTHER BOARD...
Page 91: ...A07B500S manual Pag 91 MBP BOARD MOTHER BOARD...
Page 92: ...A07B500S manual Pag 92 MBP BOARD MOTHER BOARD...
Page 93: ...A07B500S manual Pag 93 MBP BOARD MOTHER BOARD...
Page 97: ...A07B500S manual Pag 97 258 1 74HC00N Gate 2 Input NAND U23 KEY BOARD KEY...
Page 98: ...A07B500S manual Pag 98 KEY BOARD KEY...
Page 100: ...A07B500S manual Pag 100 SINTD BOARD VCO OSCILLATOR...
Page 101: ...A07B500S manual Pag 101 SINTD BOARD VCO OSCILLATOR...
Page 104: ...A07B500S manual Pag 104 Total DMPX BOARD STEREOCODER...
Page 105: ...A07B500S manual Pag 105 DMPX BOARD STEREOCODER...
Page 108: ...A07B500S manual Pag 108 AGC BOARD AUDIO AUTOMATIC GAIN CONTROL...
Page 109: ...A07B500S manual Pag 109 AGC BOARD AUDIO AUTOMATIC GAIN CONTROL...
Page 112: ...A07B500S manual Pag 112 MBP500 BOARD MBP A500 CONNECTION...
Page 113: ...A07B500S manual Pag 113 MBP500 BOARD MBP A500 CONNECTION...
Page 115: ...A07B500S manual Pag 115 A15 BOARD RF DRIVER AMPLIFIER...
Page 116: ...A07B500S manual Pag 116 A15 BOARD RF DRIVER AMPLIFIER...
Page 118: ...A07B500S manual Pag 118 DC250 BOARD DIRECTIONAL COUPLER...
Page 119: ...A07B500S manual Pag 119 DC250 BOARD DIRECTIONAL COUPLER...
Page 122: ...A07B500S manual Pag 122 A500 BOARD POWER AMPLIFIER A500 BOARD POWER AMPLIFIER...
Page 123: ...A07B500S manual Pag 123 A500 BOARD POWER AMPLIFIER...
Page 124: ...A07B500S manual Pag 124 PW500 BOARD AUXILIARY POWER SUPPLY...
Page 125: ...A07B500S manual Pag 125 PW500X BOARD AUXILIARY POWER SUPPLY...
Page 126: ...A07B500S manual Pag 126 PW500 BOARD AUXILIARY POWER SUPPLY...
Page 127: ...A07B500S manual Pag 127 PW500X BOARD AUXILIARY POWER SUPPLY...
Page 130: ...A07B500S manual Pag 130 LPF500 BOARD RF LOW PASS FILTER...