Brezžični video prenos RF frekvenca Digitalni navzdolnji pretvornik COFDM Frekvenca prenosa 2,4 G do 600 Mhz nizek BDC
Digitalni Dol pretvornik
Brezžični video prenos RF frekvenca Digitalni navzdolnji pretvornik COFDM Frekvenca prenosa 2,4 G do 600 Mhz nizka
Kazalo
prodajne točke
- Vhodne frekvence iz 24000 na 600MHz (Spodnja 1800Mhz)
- Širokopasovna
- Nizka raven hrupa faza
- Visoko-frekvenčno stabilnost
Tehnični podatki
RF Frekvenčni razpon: 2400 Mhz
ČE Frekvenčni razpon: 600 Mhz
Return Loss:-12 dB
frekvenca Natančnost: ± 10 ppm
Slika Zavrnitev: 60 DBC
Monotonost: ± 0,5 dB (8MHz pasovne širine)
pretvorba Gain: 25 dB
faza Noise (DBC / Hz)
DBC / Hz @ 1 kHz ≤-80
DBC / Hz @ 10KHz ≤-90
DBC / Hz @ 100kHz ≤-100
Napajalna napetost: 10~ 15V
moč Trenutna: 100 mA
Temperaturno območje: +25 ℃
Port
RF IN: SMA-50K
IF OUT: SMA-50K
Moč +12: Stick
GND: spajkanje lug
Opomba
- Pretvorniku ni treba dodati tihega ojačevalnika na zadnji strani.
- dejanska test: Test zaprtega kroga pod frekvenco 2.4GHz / pasovne širine 4MHz, občutljivost prejemanje lahko doseže -105dBm.
- Vhodna frekvenca podpira 1 ~ 3 GHz. (Lahko vam pomagamo prilagoditi).
- Izhodna frekvenca podpira 300 ~ 700MHz. (Mi lahko podpre meri).
About the above video:
Our most popular products are wireless video transmitters and receivers. Vendar, 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.
pogosta vprašanja
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. na primer:,
- 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, na primer, 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.
Da, our professional engineer replied, we can do it. And, before delivery, we will show you the test video.
Da, our professional engineer confirms that we can re-design and modify some key components to do that. Seveda, 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.
vprašanje: 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. Lokalni oscilator 1800 Mhz.
Da, Here is our specification for your references.
Frequency Down Converer Block specification sheet
|
Postavka |
Tehnični podatki |
|
input frequency |
950 MHz ～1550 MHz |
|
output frequency |
350 MHz ～850 MHz |
|
Local frequency |
1800 MHz |
|
RAZPON |
500MHz |
|
hrup Slika |
≤1.5dB |
|
dobiček |
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 vmesnik |
SMA-50KFD |
|
velikost |
108*48*15mm |
|
Power supply mode |
Socket power supply |
Frequency Up Converer Block specification sheet
|
Postavka |
Tehnični podatki |
|
input frequency |
350 MHz ～850 MHz |
|
output frequency |
950 MHz ～1550 MHz |
|
Local frequency |
1800 MHz |
|
RAZPON |
500MHz |
|
hrup Slika |
≤1.5dB |
|
dobiček |
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 vmesnik |
SMA-50KFD |
|
velikost |
108*48*15mm |
|
Power supply mode |
Socket power supply |
vprašanje: If a signal of -25 dbm enter, what level has the coverterd output?
odgovor: 0 dBm
Kaj je DDC
V digitalno obdelavo signalov, digitalni navzdol pretvornik (DDC) pretvori digitalizirano, pasovno omejen signal na signal nižje frekvence pri nižji stopnji vzorčenja, da se poenostavijo naslednje radijske stopnje. Proces ohranja vse informacije v prvotni signala manj, kar je izgubljeno zaokroževanja v matematičnih procesov. Vhodni in izhodni signali so lahko realna ali kompleksna vzorci. Pogosto DDC pretvori iz surovega radijske frekvence ali vmesne frekvence do kompleksnega pasu signala.
Arhitektura
DDC je sestavljen iz treh podkomponentah: neposreden digitalni sintetizator (DDS), filter nizkopasovni (LPF), and a down sampler (ki se lahko vključijo v filtru nizkopasovnega). DDS ustvarja kompleksno sinusoide na vmesni frekvenci (ČE). Množenje vmesne frekvence z vhodnega signala ustvarja podobe, osredotočena na vsoto in razliko frekvence (kar izhaja iz lastnosti frekvenčnega premika Fourierove transformacije). The low-pass filters pass the difference (t.j.. pasu) frekvenca pa je zavrnila vsota frekvence sliko na, Nastalo v kompleksnem pasu zastopanje prvotnega signala. Ob predpostavki premišljene izbire pasovne širine IF in LPF, kompleksu pasu signal je matematično enaka prvotni signala. V svoji novi obliki, it can readily be down-sampled and is more convenient to many DSP algorithms. Vsak primerno nizkopasovni filter je mogoče uporabiti tudi FIR, IIR, in CIC filtri. Najpogostejša izbira je FIR filter za majhne količine zdesetkanja (manj kot deset) or a CIC filter followed by an FIR filter for larger down-sampling ratios.
Variacije na DDC
V pomoč je več različic DDC, vključno s številnimi, da vhodni povratno signala v DDS. Tej vključujejo:
- 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, in dobljeno signal napake filtriramo in dovaja nazaj v DDS
- Costas zanke, pri kateri I in Q pomnožijo in nizkoprepustni filtriramo kot del BPSK / QPSK obnovitveni nosilec zanke
izvajanje
DDCS se najpogosteje izvaja v logiki na terenu, programabilni gate nizi ali uporabe posameznih integriranih vezij. Medtem ko so možni tudi programske izvedb, dejavnosti v DDS, multiplikatorji, and input stages of the low-pass filters all run at the sampling rate of the input data. Ti podatki se pogosto vzeta neposredno iz analognega v digitalni pretvorniki (ADC) vzorčenje na desetine ali stotine 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.
Pretvornik navzdol za prenos slike Kitajska, dobavitelj Shenzhen， Prilagajanje frekvence
ime: Pretvornik slike navzdol
model: LWDC-248258I
Številčenje: 1805001
RF +12V IF
ime: RF pretvornik navzdol
Model: LWDC-3000I
Model: LWDC-1400
Frekvenčni vhod 2G~2,7G(2000~2700MHz)
Nižje: 1800Mhz
Frekvenčni izhod: 200Mhz-700Mhz
SN2405002
| MIN | VRSTA | Funkcija stikala za vklop/izklop referenčne črte | ||
| Frekvenčni pas delovanja (MHz) | 1300 | – | 1400 | Delovni frekvenčni pas (MHz) |
| Lokalni oscilator (MHz) | 1000 | Lokalni oscilator (MHz) | ||
| Vmesna frekvenca (MHz) | 300 | – | 400 | Vmesna frekvenca (MHz) |
| Pridobitev pretvorbe Pridobitev(dB) | 18 | 20 | 22 | Pridobitev pretvorbe Pridobitev(dB) |
| Pridobite ravnost (dB) | ±1 | – | Pridobite ravnost(dB) | |
| Številka hrupa (dB) | 1.5 | – | Noise Figure(dB) | |
| Razmerje stoječih valov v vratih VSWR | 1.5 | 1.8 | 2 | Razmerje stoječih valov v vratih VSWR |
| Impedanca vrat(ohm) | 50 | – | impedanca vrat(ohm) | |
| Največja vhodna moč (dBm) | -5 | Največja vhodna moč (dBm) | ||
| Največja izhodna moč (dBm) | 15 | Največja izhodna moč (dBm) | ||
| Delovna napetost (V) | 10 | 12 | 15 | Delovna napetost (V) |
| delovni tok (mA) | 130 | 150 | 180 | Delovni tok (mA) |
| Delovna temperatura (° C) | -25 | 55 | Delovna temperatura (°C) | |
| temperatura skladiščenja (° C) | -45 | 65 | Temperatura skladiščenja (C) | |
| Dimenzija mm (brez priključkov) | 62x32x14 mm | Mere mm (brez priključka) |
Customize Frequency Specification Sheet Download
| Postavka | parameter |
| input frequency | 2100 MHz ～2500 MHz |
| output frequency | 350 MHz ～750 MHz |
| Local frequency | 1750 MHz |
| hrup Slika | ≤1.5dB |
| dobiček | 15 dB |
| Carrier leakage | ≤-20dBm |
| Belt unevenness(8MHz) | ≤1.5dB |
| IIP3: | ≥15dBm |
| maximum input level | 0dBm |
| VSWR | ≤1.5 |
| operation temperature | -10～+60℃ |
| voltage current | ≤12V/240mA |
| RF vmesnik | N-50KFD |
| velikost | 108*48*22mm |
| Power supply mode | Online power supply |
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