Chengdu LIKE Electronics Co., Ltd.

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LKM750-3 Standard Intermediate Frequency Modulator

Product Details:

Place of Origin	Sichuan, China (Mainland)
Brand Name	LIKE
Model Number	LKM750-3

Payment & Shipping Terms:

Minimum Order Quantity:	100 Set/Sets
Payment Terms:	L/C,T/T
Supply Ability:	100 Set/Sets per Week

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Detailed Product Description

Details:

LKM750-3 Standard Intermediate Frequency Modulator

LKM750-3 Modulator is our special products to satisfy Middle and Small-size cable TV systems, adopts intermediate frequency manage technology, this product is widely used in Middle and Small-size system headends.

Feature:

LKM750- adjacent frequency modulators correspond to Category-- Technical Index of the state respectively. Users may choose a suitable one according to their need.

Modulate video and audio signals to 38MHz and 31.5MHz respectively. In order to make the image modulation depth is more than 87.5% and the inter-modulation index, a loop-type mixer is adopted. Moreover, the A/V ratio, video and sound modulation degree are adjustable so as to the modulator is in the optimal state when different signal sources appear.

A phase-locked loop (PLL) is available for the sound 6.5MHz±1KHZ so that the sound frequency stays stable and accurate and the sound is clear and will not change as the temperature changes.

PLL is used for local oscillator of frequency converter so that the image frequency stays stable and accurate.

A saw filter is used to filter waves of intermediate frequency so that the out-band is below 60dB.

Channels can be displayed on the nixie-tube LED. The output power level is adjustable between 0 and 20dB. Output (RF) is 113 dBµV or 110 dBµV.

It has a 19 standard enclosure made from aluminum alloy materials, beautiful and durable.

Performance Index

Item	LKM750-
1Video input range	1vp-p (all TV signals, positive polarity)
2Video input impedance	75Ω
3. Audio input range	0.755V
4. Audio input impedance	10KΩ
5. Video signal clamping capacity	≥26dB
6. Video signal modulation degree	≥87.5%
7. Video in-band flatness	≤±2dB
8. Differential gain	≤8%
9. Differential phase	≤8°
10. Chrom/Lum time delay difference	≤60ns
11. Video SNR	52dB
12. Output channel	45-750MHz(any channel)
13. Frequency accuracy	≤10 KHz
14. Frequency total departure	≤15KHz
15. Image carrier output level	110dBμV
16. Adjustable range of output level	95-110 dBμV
17. Vision-to-Audio carrier power ratio	-10-20dB(continuously adjustable)
18. RF output impedance	75Ω(Type-F Socket)
19. Spurious output rejection	≥60dB
20. Video audio carrier frequency increment	6500KHz±20 KHz
21. Maximum audio frequency offset.	±50 KHz
22. Audio pre-emphasis	50μs
23. Audio in-band flatness	±1.5dB(40 Hz-15 KHz)
24. Audio distortion	2%
25. Audio SNR	≥50dB
26. C/CSO	≥60dB
27. Output return loss	≥12dB