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

جدول المحتويات
نقاط البيع
- Input frequencies from 24000 to 600MHz (Lower 1800Mhz)
- عرض النطاق الترددي العالي
- Low phase noise
- 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
- The converter does not need to add a low-noise amplifier at the back end.
- Actual Test: closed-loop test under the frequency of 2.4GHz/bandwidth 4MHz, the receiving sensitivity can reach -105dBm.
- Input frequency supports 1~3GHz. (We can help customize).
- 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.


الأسئلة الشائعة
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.
نعم فعلا, our professional engineer replied, we can do it. And, before delivery, we will show you the test video.
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.
Thanks for your inquiry, I will check with our engineer.
Thanks for your inquiry. We can customize for you.
Please tell us the specification details of your transmitter and receiver modules.
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
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:
- 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
- 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
| MIN | TYPE | الأعلى | ||
| نطاق تردد التشغيل (ميغاهيرتز) | 1300 | – | 1400 | 工作频段 (MHz) |
| مذبذب محلي (ميغاهيرتز) | 1000 | 本振(MHz) | ||
| Intermediate frequency (ميغاهيرتز) | 300 | – | 400 | 中频(MHz) |
| Conversion gain Gain(ديسيبل) | 18 | 20 | 22 | 变频增益Gain(ديسيبل) |
| Gain Flatness (ديسيبل) | ±1 | – | 增益平坦度(dB) | |
| Noise figure (ديسيبل) | 1.5 | – | 噪声系数(dB) | |
| Port Standing Wave Ratio VSWR | 1.5 | 1.8 | 2 | 端口驻波比VSWR |
| Port Impedance(أوم) | 50 | – | 端口阻抗(أوم) | |
| الحد الأقصى لطاقة الإدخال (ديسيبل) | -5 | 最大输入功率(dBm) | ||
| الحد الأقصى لطاقة الإخراج (ديسيبل) | 15 | 最大输出功率(dBm) | ||
| جهد العمل (V) | 10 | 12 | 15 | 工作电压(V) |
| التشغيل الحالي (mA) | 130 | 150 | 180 | 工作电流(mA) |
| درجة حرارة التشغيل (درجة مئوية) | -25 | 55 | 工作温度(°C) | |
| درجة حرارة التخزين (درجة مئوية) | -45 | 65 | 存储温度(C) | |
| Dimension mm (without connectors) | 62x32x14mm | 尺寸 mm (不含连接器) |


Customize Frequency Specification Sheet Download
| غرض | معامل |
| تردد الإدخال | 2100 MHz ~2500 MHz |
| تردد الإخراج | 350 MHz ~750 MHz |
| التردد المحلي | 1750 ميغاهيرتز |
| Noise Figure | ≤1.5dB |
| يكسب | 15 ديسيبل |
| تسرب الناقل | ≥-20 ديسيبل |
| Belt unevenness(8ميغاهيرتز) | ≤1.5dB |
| IP3: | ≥15dBm |
| الحد الأقصى لمستوى الإدخال | 0ديسيبل |
| VSWR | .51.5 |
| درجة حرارة التشغيل | -10~+60℃ |
| تيار الجهد | ≤12V/240mA |
| واجهة RF | N-50KFD |
| مقاس | 108*48*22مم |
| وضع إمدادات الطاقة | Online power supply |







Paul –
This COFDM Digital Down Converter delivers flawless frequency conversion with ultra-low latency. The signal clarity and stability are unmatched—perfect for professional broadcast and surveillance applications. موصى به للغاية!