無線視頻傳輸 RF 頻率數字下變頻器 COFDM 傳輸頻率 2.4G 至 600Mhz 低 BDC
數字下變頻器
無線視頻傳輸 RF 頻率數字下變頻器 COFDM 傳輸頻率 2.4G 至 600Mhz 低
目錄
賣點
- 從輸入頻率 24000 至600MHz (較低的是1800Mhz)
- 高帶寬
- 低相位噪聲
- 高頻穩定性
規範
RF頻率範圍: 2400 兆赫
IF頻率範圍: 600 兆赫
回波損耗:-12 分貝
頻率精度: ±10ppm的
鏡像抑制: 60 dBc的
平整度: ±0.5分貝 (8MHz帶寬)
轉換增益: 25 分貝
相位噪聲 (dBc的/赫茲)
dBc的/赫茲@ 1KHz的≤-80
dBc的/赫茲@ 10KHz的≤-90
dBc的/赫茲@ 100KHz的≤-100
電源電壓: 10〜15V
功率電流: 100 毫安
工作溫度範圍: +25 ℃
港口
RF IN: SMA-50K
IF OUT: SMA-50K
電源+ 12V: 棒
GND: 焊片
注意
- 轉換器無需在後端添加低噪聲放大器.
- 實際測試: 的2.4GHz /帶寬為4MHz的頻率下閉環試驗, 接收靈敏度可以達到-105dBm.
- 輸入頻率支持1〜3GHz的. (我們可以幫助定制).
- 輸出頻率支持300〜700MHz的. (我們可以支持自定義).
About the above video:
Our most popular products are wireless video transmitters and receivers. 然而, 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.
常見問題
A RF frequency block downconverter (BDC) 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. 例如,
- 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, 例如, between 300-800Mhz.
In order for the transmitter's frequency to be paired, ŧhe frequency of the 1.2G transmitter must be reduced.
All of this necessitates the use of a frequency downconverter for wireless video transmission.
是, our professional engineer replied, we can do it. And, before delivery, we will show you the test video.
是, our professional engineer confirms that we can re-design and modify some key components to do that. 當然, before delivery, we will show you the test video.
Thanks for your inquiry, I will check with our engineer.
Thanks for your inquiry. 我們可以為您量身訂製.
Please tell us the specification details of your transmitter and receiver modules.
題: We are interested in n.1 downconverter from 950-1500 Mhz to 350-850 Mhz and n.1 upconverter from 350-850 Mhz to 950-1500 兆赫. 本地振盪器 1800 兆赫.
是, Here is our specification for your references.
Frequency Down Converer Block specification sheet
|
項目 |
規範 |
|
input frequency |
950 MHz ～1550 MHz |
|
output frequency |
350 MHz ～850 MHz |
|
Local frequency |
1800 兆赫 |
|
跨度 |
500兆赫 |
|
噪聲係數 |
≤1.5dB |
|
獲得 |
25 分貝 |
|
Carrier leakage |
≤-20dBm |
|
Belt unevenness(8兆赫) |
≤1.5dB |
|
IIP3: |
≥15dBm |
|
maximum input level |
-10dBm的 |
|
VSWR |
≤1.5 |
|
operation temperature |
-10～+60℃ |
|
voltage current |
12V/240mA |
|
射頻接口 |
SMA-50KFD |
|
尺寸 |
108*48*15毫米 |
|
Power supply mode |
Socket power supply |
Frequency Up Converer Block specification sheet
|
項目 |
規範 |
|
input frequency |
350 MHz ～850 MHz |
|
output frequency |
950 MHz ～1550 MHz |
|
Local frequency |
1800 兆赫 |
|
跨度 |
500兆赫 |
|
噪聲係數 |
≤1.5dB |
|
獲得 |
25 分貝 |
|
Carrier leakage |
≤-20dBm |
|
Belt unevenness(8兆赫) |
≤1.5dB |
|
IIP3: |
≥15dBm |
|
maximum input level |
-10dBm的 |
|
VSWR |
≤1.5 |
|
operation temperature |
-10～+60℃ |
|
voltage current |
12V/240mA |
|
射頻接口 |
SMA-50KFD |
|
尺寸 |
108*48*15毫米 |
|
Power supply mode |
Socket power supply |
題: If a signal of -25 dbm enter, what level has the coverterd output?
回答: 0 dBm的
什麼是DDC
在數字信號處理, 數字下變頻器 (DDC) 轉換數字化, 以較低的採樣率將帶限信號轉換為較低頻率的信號，以簡化後續的無線電階段. 過程保留原始信號較少被輸給舍入誤差的數學過程的所有信息. 的輸入和輸出信號可以是實數或复採樣. 通常，DDC從原始射頻或中頻轉換至一複合基帶信號.
建築
一個DDC包括三個子: 直接數字合成器 (DDS), 一個低通濾波器 (LPF), and a down sampler (其可以被集成到低通濾波器). 該DDS在中頻生成複數正弦 (如果). 與輸入信號的中頻的乘法在創建的和與差頻率為中心的圖像 (這源於傅里葉變換的頻移特性). The low-pass filters pass the difference (即. 基帶) 頻率，同時抑制和頻圖像, 導致原始信號的复基帶表示. 假設 IF 和 LPF 帶寬的明智選擇, 复基帶信號在數學上等同於原始信號. 在其新的形式, it can readily be down-sampled and is more convenient to many DSP algorithms. 任何合適的低通濾波器可以被使用，包括FIR, IIR, 和 CIC 過濾器. 最常見的選擇是用於少量抽取的 FIR 濾波器 (不到十) or a CIC filter followed by an FIR filter for larger down-sampling ratios.
在DDC變化
DDC 的幾個變體很有幫助, 包括許多輸入端的反饋信號到所述DDS. 這些包括:
- 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, 將得到的誤差信號被濾波並反饋到DDS
- 科斯塔斯環，其中，I和Q相乘，低通濾波，為BPSK / QPSK載波恢復環路的一部分
履行
DDC的在邏輯最通常實現在現場可編程門陣列或專用集成電路. 雖然軟件實現方式也是可能, 在DDS操作, 乘數, and input stages of the low-pass filters all run at the sampling rate of the input data. 這個數據通常採取直接從模擬到數字轉換器 (模數轉換器) 取樣是在幾十或幾百MHz的. 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.
圖傳下變頻器中國深圳供應商， 頻率定制
名稱: 圖傳下變頻器
型號: LWDC-248258I
編號: 1805001
射頻 +12V 中頻
名稱: 射頻下變頻器
模型: LWDC-3000I
模型: LWDC-1400
頻率輸入2G~2.7G(2000~2700MHz)
降低: 1800兆赫
頻率輸出: 200兆赫-700兆赫
SN2405002
| 最小 | 類型 | 默認為 NTSC | ||
| 工作頻段 (兆赫) | 1300 | – | 1400 | 工作頻段 （MHz) |
| 本地振盪器 (兆赫) | 1000 | 本振（MHz) | ||
| 中頻 (兆赫) | 300 | – | 400 | 中頻（MHz) |
| 轉換增益增益(分貝) | 18 | 20 | 22 | 變頻增益Gain(分貝) |
| 獲得平坦度 (分貝) | ±1 | – | 增益平坦度(D b） | |
| 噪聲係數 (分貝) | 1.5 | – | 噪聲係數(D b） | |
| 端口駐波比VSWR | 1.5 | 1.8 | 2 | 端口駐波比VSWR |
| 端口阻抗(歐姆) | 50 | – | 端口阻抗(歐姆) | |
| 最大輸入功率 (dBm的) | -5 | 最大輸入功率（dBm） | ||
| 最大輸出功率 (dBm的) | 15 | 最大輸出功率（dBm) | ||
| 工作電壓 (V) | 10 | 12 | 15 | 工作電壓（V) |
| 工作電流 (毫安) | 130 | 150 | 180 | 工作電流（mA） |
| 工作溫度 (C) | -25 | 55 | 工作溫度（°C) | |
| 儲存溫度 (C) | -45 | 65 | 存儲溫度（C) | |
| 尺寸毫米 (無接頭) | 62x32x14mm | 尺寸 mm (不含連接器) |
Customize Frequency Specification Sheet Download
| 項目 | 參數 |
| input frequency | 2100 MHz ～2500 MHz |
| output frequency | 350 MHz ～750 MHz |
| Local frequency | 1750 兆赫 |
| 噪聲係數 | ≤1.5dB |
| 獲得 | 15 分貝 |
| Carrier leakage | ≤-20dBm |
| Belt unevenness(8兆赫) | ≤1.5dB |
| IIP3: | ≥15dBm |
| maximum input level | 0dBm的 |
| VSWR | ≤1.5 |
| operation temperature | -10～+60℃ |
| voltage current | ≤12V/240mA |
| 射頻接口 | N-50KFD |
| 尺寸 | 108*48*22毫米 |
| Power supply mode | Online power supply |
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