Digital Down Converter
Wireless Video Transmission RF Frequency Digital Down Converter COFDM Transfer frequency 2.4G to 600Mhz low
Daftar isi
Poin Penjualan
- Input frequencies from 24000 to 600MHz (Lower 1800Mhz)
- Bandwidth tinggi
- Low phase noise
- High-frequency stability
Spesifikasi
RF Frequency Range: 2400 Mhz
IF Frequency Range: 600 Mhz
Kembali Kerugian:-12 dB
Frequency Accuracy: ±10 ppm
Penolakan Gambar: 60 dBc
Kebosanan: ±0.5 dB (8lebar pita MHz)
Conversion Gain: 25 dB
Phase Noise (dBc/Hz)
dBc/Hz@1KHz ≤-80
dBc/Hz@10KHz ≤-90
dBc/Hz@100KHz ≤-100
Tegangan Pasokan: 10~15V
Power Current: 100 mA
Operating Temperature Range: +25 ℃
Pelabuhan
RF IN: SMA-50K
IF OUT: SMA-50K
Power +12V: Stick
GND: Soldering lug
Catatan
- 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. Namun, 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.
FAQ
Konverter bawah blok frekuensi RF (BDC) untuk pemancar video nirkabel adalah perangkat yang dapat mengubah rentang frekuensi tinggi ke rentang frekuensi rendah.
Biasanya digunakan pada sisi pemancar video nirkabel. Misalnya,
- Dari konverter bawah 5,8G ke 2,4G
- Dari konverter turun 2.4G ke 1.2G
- Dari konverter turun 1,2G ke 600Mhz
Hal ini disebabkan oleh fakta bahwa frekuensi transmisi nirkabel di banyak negara atau wilayah dibatasi oleh undang-undang dan peraturan setempat.
Tidak diperbolehkan untuk digunakan dalam rentang frekuensi tertentu.
Untuk mengubah frekuensi operasi pemancar dan penerima, diperlukan konversi turun atau konversi naik. Pastikan frekuensi transmisi sesuai dengan hukum dan peraturan setempat.
Ada juga kasus dimana frekuensi penerimaan profesional ditetapkan, sebagai contoh, antara 300-800Mhz.
Agar frekuensi pemancar dapat dipasangkan, Tfrekuensi pemancar 1.2G harus dikurangi.
Semua ini memerlukan penggunaan konverter frekuensi untuk transmisi video nirkabel.
iya nih, jawab insinyur profesional kami, kita bisa melakukannya. Dan, sebelum pengiriman, kami akan menunjukkan kepada Anda video tesnya.
iya nih, insinyur profesional kami mengonfirmasi bahwa kami dapat mendesain ulang dan memodifikasi beberapa komponen utama untuk melakukan hal itu. Tentu, sebelum pengiriman, kami akan menunjukkan kepada Anda video tesnya.
Terima kasih atas pertanyaan Anda, Saya akan memeriksa dengan teknisi kami.
Terima kasih atas pertanyaan Anda. Kami dapat menyesuaikannya untuk Anda.
Tolong beri tahu kami detail spesifikasi modul pemancar dan penerima Anda.
Pertanyaan: Kami tertarik dengan downconverter n.1 dari 950-1500 Mhz ke 350-850 Mhz dan n.1 upconverter dari 350-850 Mhz ke 950-1500 Mhz. Osilator lokal 1800 Mhz.
iya nih, Berikut adalah spesifikasi kami untuk referensi Anda.
Lembar spesifikasi Blok Konverter Frekuensi Turun
|
Barang |
Spesifikasi |
|
frekuensi masukan |
950 MHz ~1550 MHz |
|
frekuensi keluaran |
350 MHz ~850MHz |
|
Frekuensi lokal |
1800 MHz |
|
MENJANGKAU |
500MHz |
|
Gambar Kebisingan |
≤1.5dB |
|
memperoleh |
25 dB |
|
Kebocoran pembawa |
≤-20dBm |
|
Ketidakrataan sabuk(8MHz) |
≤1.5dB |
|
IP3: |
≥15dBm |
|
tingkat masukan maksimum |
-10dBm |
|
VSWR |
≤1.5 |
|
suhu operasi |
-10～+60℃ |
|
tegangan arus |
12V/240mA |
|
Antarmuka RF |
SMA-50KFD |
|
ukuran |
108*48*15mm |
|
Modus catu daya |
Catu daya soket |
Lembar spesifikasi Blok Konverter Frekuensi Naik
|
Barang |
Spesifikasi |
|
frekuensi masukan |
350 MHz ~850MHz |
|
frekuensi keluaran |
950 MHz ~1550 MHz |
|
Frekuensi lokal |
1800 MHz |
|
MENJANGKAU |
500MHz |
|
Gambar Kebisingan |
≤1.5dB |
|
memperoleh |
25 dB |
|
Kebocoran pembawa |
≤-20dBm |
|
Ketidakrataan sabuk(8MHz) |
≤1.5dB |
|
IP3: |
≥15dBm |
|
tingkat masukan maksimum |
-10dBm |
|
VSWR |
≤1.5 |
|
suhu operasi |
-10～+60℃ |
|
tegangan arus |
12V/240mA |
|
Antarmuka RF |
SMA-50KFD |
|
ukuran |
108*48*15mm |
|
Modus catu daya |
Catu daya soket |
Pertanyaan: Jika sinyal -25 dbm masuk, tingkat apa yang memiliki output rahasia?
Menjawab: 0 dBm
Kami tidak dapat melakukan konversi frekuensi naik 1.0-2.5 GHz ke 5.8 GHz.
Tapi kami bisa memproduksinya frekuensi naik konversi dari 1.0-2.5 GHz hingga 4,3G~5,8GHz. Setiap frekuensi masukan tambahkan 3.3G (3300Mhz) ke frekuensi keluaran.
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.
Arsitektur
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 (JIKA). 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 (yaitu. 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
Nama: Konverter RF Turun
Model: LWDC-3000I
Model: LWDC-1400
Frequency input 2G~2.7G(2000~2700Mhz)
Lebih rendah: 1800Mhz
Frequency output: 200Mhz-700Mhz
SN2405002
| MIN | TYPE | MAKS | ||
| Pita frekuensi operasi (MHz) | 1300 | – | 1400 | 工作频段 （MHz) |
| Osilator lokal (MHz) | 1000 | 本振（MHz) | ||
| Frekuensi menengah (MHz) | 300 | – | 400 | 中频（MHz) |
| Conversion gain Gain(dB) | 18 | 20 | 22 | 变频增益Gain(dB) |
| Dapatkan Kerataan (dB) | ±1 | – | 增益平坦度(dB） | |
| Noise figure (dB) | 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(ohm) | 50 | – | 端口阻抗(ohm) | |
| Daya masukan maksimum (dBm) | -5 | 最大输入功率（dBm） | ||
| Daya keluaran maksimum (dBm) | 15 | 最大输出功率（dBm) | ||
| Tegangan kerja (V) | 10 | 12 | 15 | 工作电压（V) |
| Arus operasi (mA) | 130 | 150 | 180 | 工作电流（mA） |
| Suhu pengoperasian (°C) | -25 | 55 | 工作温度（°C) | |
| Suhu penyimpanan (°C) | -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
| Barang | Parameter |
| frekuensi masukan | 2100 MHz ～2500 MHz |
| frekuensi keluaran | 350 MHz ～750 MHz |
| Frekuensi lokal | 1750 MHz |
| Gambar Kebisingan | ≤1.5dB |
| memperoleh | 15 dB |
| Kebocoran pembawa | ≤-20dBm |
| Ketidakrataan sabuk(8MHz) | ≤1.5dB |
| IP3: | ≥15dBm |
| tingkat masukan maksimum | 0dBm |
| VSWR | ≤1.5 |
| suhu operasi | -10～+60℃ |
| tegangan arus | ≤12V/240mA |
| Antarmuka RF | N-50KFD |
| ukuran | 108*48*22mm |
| Modus catu daya | 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. Sangat direkomendasikan!