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

Digital Down Converter

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

Selling Points

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

Specification

RF Frequency Range: 2400 Mhz
IF Frequency Range: 600 Mhz
Return Loss:-12 dB
Frequency Accuracy: ±10 ppm
Image Rejection: 60 dBc
Flatness: ±0.5 dB (8MHz bandwidth)
Conversion Gain: 25 dB
Phase Noise (dBc/Hz)
dBc/Hz@1KHz ≤-80
dBc/Hz@10KHz ≤-90
dBc/Hz@100KHz ≤-100
Supply Voltage: 10~15V
Power Current: 100 mA
Operating Temperature Range: +25 ℃

Port

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

Note

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. However, 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 (BDC)?

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. For example,

• 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, for example, 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?

Yes, 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 Mhz.

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

4. Do you have or designed for MMDS applications? From 3400 -3600MHZ, The S-Band is converted to the UHF range 400 to 600 MHz, 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 GHz? Can you make a UP converter? From 1,25 GHz to 3.4 GHz?

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?

Question: 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 Mhz. Local oscillator 1800 Mhz.

Yes, Here is our specification for your references.

Frequency Down Converer Block specification sheet

Item	Specification
input frequency	950 MHz ～1550 MHz
output frequency	350 MHz ～850 MHz
Local frequency	1800 MHz
SPAN	500MHz
Noise Figure	≤1.5dB
gain	25 dB
Carrier leakage	≤-20dBm
Belt unevenness(8MHz)	≤1.5dB
IIP3:	≥15dBm
maximum input level	-10dBm
VSWR	≤1.5
operation temperature	-10～+60℃
voltage current	12V/240mA
RF Interface	SMA-50KFD
size	108*48*15mm
Power supply mode	Socket power supply

Frequency Up Converer Block specification sheet

Item	Specification
input frequency	350 MHz ～850 MHz
output frequency	950 MHz ～1550 MHz
Local frequency	1800 MHz
SPAN	500MHz
Noise Figure	≤1.5dB
gain	25 dB
Carrier leakage	≤-20dBm
Belt unevenness(8MHz)	≤1.5dB
IIP3:	≥15dBm
maximum input level	-10dBm
VSWR	≤1.5
operation temperature	-10～+60℃
voltage current	12V/240mA
RF Interface	SMA-50KFD
size	108*48*15mm
Power supply mode	Socket power supply

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

Answer: 0 dBm

7. I’m searching for a specific down converter, to be used with our own OFDM RF link.

I’m searching for a specific downconverter, to be used with our own OFDM RF link:

50ohms RF input: 1.435 to 1.525 GHz

75 ohms IF output: any frequency band, between 100Mhz and 900MHz

Preferred LO frequency: 1846MHz

Low gain: about 28dB

Hight gain: about 43dB

DC powered from IF output port, 12-24vDC range

Yes, we can customize it for you.

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

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

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 (3300Mhz) 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 (IF). 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 (i.e. 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
Name: RF Down Converter
Model: LWDC-3000I
Model: LWDC-1400
Frequency input 2G~2.7G(2000~2700Mhz)
Lower: 1800Mhz
Frequency output: 200Mhz-700Mhz
SN2405002

Customize Frequency Specification Sheet Download

OF 1750Mhz Down