نقل الفيديو اللاسلكي تردد الترددات اللاسلكية الرقمية أسفل محول COFDM تردد نقل 2.4G إلى 600Mhz منخفضة BDC

Digital Down Converter

Wireless Video Transmission RF Frequency Digital Down Converter COFDM Transfer frequency 2.4G to 600Mhz low

نقاط البيع

1. Input frequencies from 24000 to 600MHz (Lower 1800Mhz)
2. عرض النطاق الترددي العالي
3. Low phase noise
4. High-frequency stability

تخصيص

RF Frequency Range: 2400 ميجاهيرتز
IF Frequency Range: 600 ميجاهيرتز
خسارة العودة:-12 ديسيبل
Frequency Accuracy: ±10 ppm
رفض الصورة: 60 ديسيبل
التسطيح: ±0.5 dB (8عرض النطاق الترددي ميغاهيرتز)
Conversion Gain: 25 ديسيبل
Phase Noise (ديسيبل/هرتز)
dBc/Hz@1KHz ≤-80
dBc/Hz@10KHz ≤-90
dBc/Hz@100KHz ≤-100
جهد الإمداد: 10~15V
Power Current: 100 mA
Operating Temperature Range: +25 درجه مئوية

ميناء

RF IN: SMA-50K
IF OUT: SMA-50K
Power +12V: Stick
أرض: Soldering lug

ملحوظة

1. The converter does not need to add a low-noise amplifier at the back end.
2. Actual Test: closed-loop test under the frequency of 2.4GHz/bandwidth 4MHz, the receiving sensitivity can reach -105dBm.
3. Input frequency supports 1~3GHz. (We can help customize).
4. Output frequency supports 300~700MHz. (We can support customize).

About the above video:

Our most popular products are wireless video transmitters and receivers. لكن, some clients require modification of the transmission frequency to meet local legal demand, in which case the digital frequency up-down converter block comes in handy. One customer requested that we customize the RF frequency down converter for his 2.4G wireless video transmitter. So the input frequency is 2.4GHz, the output frequency is 600MHz, and the lowdown frequency is 1800MHz. We created the sample in accordance with his specifications. So I showed him a simple video that showed the 2.4G transmitter and 600Mhz receiver working correctly. If you have a similar requirement, such as 1-3G frequency input and 300-700Mhz output, please contact us for a custom solution.

1. What is an RF frequency digital block-down converter (بي دي سي)?

A RF frequency block downconverter (بي دي سي) for wireless video transmitters is a device that can convert a high frequency range to a low frequency range.

Typically used on the wireless video transmitter side. على سبيل المثال,

• From 5.8G to 2.4G down converter
• From 2.4G to 1.2G down converter
• From 1.2G to 600Mhz down converter

This is due to the fact that wireless transmission frequencies in many countries or regions are restricted by local laws and regulations.

It is not permitted to use in a specific frequency range.

To change the operating frequency of the transmitter and receiver, down-conversion or up-conversion is required. Make sure the transmission frequency is in accordance with local laws and regulations.

There is also the case where the professional receiving frequency is fixed, على سبيل المثال, between 300-800Mhz.

In order for the transmitter's frequency to be paired, the frequency of the 1.2G transmitter must be reduced.

All of this necessitates the use of a frequency downconverter for wireless video transmission.

2. My input frequency range would need to be 2.0Ghz to 2.7Ghz, need a downconverter to 200 Mhz to 900Mhz. The conversion gain would ideally be 30db not 25db. Would this be easy for you to do?

نعم فعلا, our professional engineer replied, we can do it. And, before delivery, we will show you the test video.

3. Can you make a down converter with LO1G? we need input 1300-1400 Mhz frequency and output 300-400 ميجاهيرتز.

نعم فعلا, our professional engineer confirms that we can re-design and modify some key components to do that. بالتأكيد, before delivery, we will show you the test video.

4. Do you have or designed for MMDS applications? من 3400 -3600ميغاهيرتز, The S-Band is converted to the UHF range 400 ل 600 ميغاهيرتز, LO oscillator is 3000MHZ.

Thanks for your inquiry, I will check with our engineer.

5. What is RF output in dB? Can you make a down converter from 5.8 GHz to 3.1 غيغاهرتز? Can you make a UP converter? من 1,25 GHz to 3.4 غيغاهرتز?

Thanks for your inquiry. We can customize for you.

Please tell us the specification details of your transmitter and receiver modules.

6. Would you customize the frequency up-converter block and frequency down-converter block?

سؤال: نحن مهتمون بـ n.1 downconverter من 950-1500 ميجاهرتز ل 350-850 ميغاهيرتز وn.1 upconverter من 350-850 ميجاهرتز ل 950-1500 ميجاهيرتز. مذبذب محلي 1800 ميجاهيرتز.

نعم فعلا, Here is our specification for your references.

Frequency Down Converer Block specification sheet

غرض	تخصيص
تردد الإدخال	950 MHz ～1550 MHz
تردد الإخراج	350 MHz ～850 MHz
التردد المحلي	1800 ميغاهيرتز
SPAN	500ميغاهيرتز
Noise Figure	≤1.5dB
يكسب	25 ديسيبل
تسرب الناقل	≥-20 ديسيبل
Belt unevenness(8ميغاهيرتز)	≤1.5dB
IP3:	≥15dBm
الحد الأقصى لمستوى الإدخال	-10ديسيبل
VSWR	.51.5
درجة حرارة التشغيل	-10～+60℃
تيار الجهد	12V/240mA
واجهة RF	SMA-50KFD
مقاس	108*48*15مم
وضع إمدادات الطاقة	مصدر طاقة المقبس

Frequency Up Converer Block specification sheet

غرض	تخصيص
تردد الإدخال	350 MHz ～850 MHz
تردد الإخراج	950 MHz ～1550 MHz
التردد المحلي	1800 ميغاهيرتز
SPAN	500ميغاهيرتز
Noise Figure	≤1.5dB
يكسب	25 ديسيبل
تسرب الناقل	≥-20 ديسيبل
Belt unevenness(8ميغاهيرتز)	≤1.5dB
IP3:	≥15dBm
الحد الأقصى لمستوى الإدخال	-10ديسيبل
VSWR	.51.5
درجة حرارة التشغيل	-10～+60℃
تيار الجهد	12V/240mA
واجهة RF	SMA-50KFD
مقاس	108*48*15مم
وضع إمدادات الطاقة	مصدر طاقة المقبس

سؤال: If a signal of -25 dbm enter, what level has the coverterd output?

إجابة: 0 ديسيبل

7. I’m searching for a specific down converter, لاستخدامها مع وصلة OFDM RF الخاصة بنا.

أنا أبحث عن محول خفض معين, لاستخدامها مع وصلة OFDM RF الخاصة بنا:

50أوم مدخلات الترددات اللاسلكية: 1.435 ل 1.525 غيغاهرتز

75 أوم IF output: أي نطاق تردد, بين 100 ميجا هرتز و 900 ميجا هرتز

تردد LO المفضل: 1846ميغاهيرتز

مكاسب منخفضة: حوالي 28 ديسيبل

مكاسب عالية: حوالي 43 ديسيبل

تيار مستمر مدعوم من منفذ إخراج IF, 12-24نطاق فولت تيار مستمر

نعم فعلا, يمكننا تخصيصها لك.

8. Can you make a frequency up convert from 1.0-2.5 GHz to 5.8 غيغاهرتز?

We can not make a frequency up convert from 1.0-2.5 GHz to 5.8 غيغاهرتز.

But we can produce the frequency up convert from 1.0-2.5 GHz to 4.3G~5.8 GHz. Every input frequency add 3.3G (3300ميجاهيرتز) to output frequency.

What is DDC

In digital signal processing, a digital down-converter (DDC) converts a digitized, band-limited signal to a lower frequency signal at a lower sampling rate in order to simplify the subsequent radio stages. The process preserves all the information in the original signal less that which is lost to rounding errors in the mathematical processes. The input and output signals can be real or complex samples. Often the DDC converts from the raw radio frequency or intermediate frequency down to a complex baseband signal.

Architecture

A DDC consists of three subcomponents: a direct digital synthesizer (DDS), a low-pass filter (LPF), and a down sampler (which may be integrated into the low-pass filter). The DDS generates a complex sinusoid at the intermediate frequency (لو). Multiplication of the intermediate frequency with the input signal creates images centered at the sum and difference frequency (which follows from the frequency-shifting properties of the Fourier transform). The low-pass filters pass the difference (أي. baseband) frequency while rejecting the sum frequency image, resulting in a complex baseband representation of the original signal. Assuming a judicious choice of IF and LPF bandwidth, the complex baseband signal is mathematically equivalent to the original signal. In its new form, it can readily be down-sampled and is more convenient to many DSP algorithms. Any suitable low-pass filter can be used including FIR, IIR, and CIC filters. The most common choice is an FIR filter for low amounts of decimation (less than ten) or a CIC filter followed by an FIR filter for larger down-sampling ratios.

Variations on the DDC

Several variations on the DDC are helpful, including many that input a feedback signal into the DDS. These include:

1. Decision-directed carrier recovery phase-locked loops in which the I and Q are compared to the nearest ideal constellation point of a PSK signal, and the resulting error signal is filtered and fed back into the DDS
2. A Costas loop in which the I and Q are multiplied and low pass filtered as part of a BPSK/QPSK carrier recovery loop

Implementation
DDCs are most commonly implemented in logic in field-programmable gate arrays or application-specific integrated circuits. While software implementations are also possible, operations in the DDS, multipliers, and input stages of the low-pass filters all run at the sampling rate of the input data. This data is commonly taken directly from analog to digital converters (ADCs) sampling at tens or hundreds of MHz. CORDIC is an alternative to the use of multipliers in the implementation of digital down converters.

Here is a client’s customized project, 1300~1400 Mhz input down converter to 300-400Mhz.

图传下变频器中国深圳供应商， 频率定制

名称: 图传下变频器
型号: LWDC-248258I
编号: 1805001
RF +12V IF
اسم: محول الترددات اللاسلكية للأسفل
نموذج: LWDC-3000I
نموذج: LWDC-1400
Frequency input 2G~2.7G(2000~2700Mhz)
أدنى: 1800ميجاهيرتز
Frequency output: 200Mhz-700Mhz
SN2405002

Customize Frequency Specification Sheet Download

OF 1750Mhz Down