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LA1065M Fiches technique(PDF) 4 Page - Sanyo Semicon Device |
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LA1065M Fiches technique(HTML) 4 Page - Sanyo Semicon Device |
4 / 8 page LA1065M No.3312-4/8 (2) S meter voltage comparison For a medium field, the sound may be better if the antenna is switched by comparing S meter DC voltage rather than using multi-path distortion detection when, for example, there is quite a difference (more than 10dB) in antenna sensitivity between MAIN and SUB. On the LA1065M, a built-in comparator detects the medium field, and compares S meter DC voltage in order to switch the antenna. (3) Weak field detection and antenna fixing (MAIN) There is a difference in antenna sensitivity between MAIN and SUB in a weak field, so sensitivity will be insufficient even if switched to SUB. The LA1065M uses a comparator, as shown below, to detect the weak field and fix the switching signal to the MAIN side. (4) Very strong field detection and antenna fixing (SUB) Interference such as I.M. (intermodulation) and cross modulation is generated in a very strong field. One countermeasure is to use a PIN diode for antenna damping, but here the lower antenna gain on the SUB side is utilized to fix the antenna to the SUB side when the electric field is strong. Also, with LA1065M, operation returns to normal when multi-path is generated. (5) AGC voltage output As described in the section on bottom detection-type noise AGC, AGC voltage goes high when there is a lot of noise on both MAIN and SUB sides. This voltage can be used to apply SNC, HCC and so on when the conditions are poor for both MAIN and SUB. (6) S meter switch The LA1065M has built-in S meter switch so that SNC can be applied according to the MAIN and SUB switching output. When the antenna is on MAIN, SNC is applied by MAIN side S meter voltage, and when it is on SUB, by SUB side meter voltage. (7) Logic section The LA1065M operation is shown in th table below. Unit (resistance : Ω) MAIN multi- path detection With noise No noise * * * * No noise Large noise Small noise No noise With noise * * * No noise With noise Medium noise Medium noise * * * MAIN>SUB MAIN<SUB * * * * Strong field Strong field Weak field Medium field Medium field Strong field Strong field Strong field Strong field Weak-medium field Weak-medium field * Weak-medium field Weak-medium field Very strong field Very strong field Very strong field Very strong field SUB side MAIN side MAIN side MAIN side SUB side SUB side MAIN side SUB side MAIN side SUB multi- path detection MAIN S meter voltage SUB S meter voltage FE AGC voltage MAIN/SUB switching output * : Under any conditions |
Numéro de pièce similaire - LA1065M |
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Description similaire - LA1065M |
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