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參數(shù)資料
| 型號(hào)： | LA1245 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | AM Electronic Tuner |
| 中文描述： | 上午電子調(diào)諧器 |
| 文件頁數(shù)： | 4/11頁 |
| 文件大小： | 326K |
| 代理商： | LA1245 |
LA1245
No.737-4/11
Notes on LA1245 usage
1. When suddenly tuned to a broadcasting station of intermediate or high field strength, a large current of high frequency
flows into the signal meter circuit, causing the local oscillator malfunctions and abnormal noises.
To eliminate this :
· Use R
208
≥
240
for manual tuning type.
· Use R
208
≥
82
, and use the local oscillation coil at the 1/3 tap (except SW) for electronic tuning type (which uses a
narrow band filter).
2. Use the bias on the condition RF V
CC
≤
IF V
CC
, since abnormal noise levels might be caused when detuning a strong
input on the codition RF V
CC
>IF V
CC
.
3. Use the signal meter driving output (V
SM
) at V
SM
≤
V
CC
–2 (V) to avoid saturation caused by V
CC
.
4. Use 1/2 or more tap of LW and MW oscillation coil to improve S/N and the detuning characteristics of the distortion
ratio.
5. Use the full-tap of SW oscillation coil, to allow the sag in oscillation power by the decreasing of Q.
6. Avoid the coupling of the antenna tuning circuit and the local oscillating circuit so as not to leak the local oscillation
into the antenna tuning circuit.
7. Connect the detection capacitor C
113
between pin 13 (output) and pin 14 (V
CC
) to avoid the leakage of the IF signal
into the GND line. Connection between pin 13 and pin 12 (GND) increases the tweet interference and deteriorates the
usable sensitivity.
Moreover, depending on the positions of C
113
and the bar antenna, higher harmonics having twice or three times the
frequency of the IF signal may pass into the antenna and cause tweet interference, and in extreme cases oscillation
might be cause. To prevent this :
· Shorter lead wires and connect them near 13 and 14 pins.
· Place C
113
far from the antenna.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| LA1247 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:AM ELECTRONIC TUNER |
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| LA1256 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Octal Peripheral Driver |
| LA125P | 制造商:LEM 制造商全稱:LEM 功能描述:CURRENT TRANSDUCER LA 125-P |
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