Wireless video transmission RF frequency Digital Converter COFDM transfer frequency 2.4 G ki he 600Mhz maʻulalo BDC

Faka'ilekitulonika hifo 'ene fakaului

Wireless video transmission RF frequency Digital Converter COFDM transfer frequency 2.4 G ki he 600Mhz maʻulalo

Ngaahi malohinga

1. Malava fakahu mei he 24000 ki he 600MHz (Holoki 'a e Mhz 'o e 1800)
2. Ma'olunga 'o e 'Initaneti (bandwidth)
3. Longoa'a 'a e konga ma'ama'a
4. Tu'unga ma'olunga-tu'o lahi

Fakapapau'i e

RF tu'o lahi kehekehe: 2400 Mhz
Kapau 'oku kau 'a e tu'o lahi: 600 Mhz
Toe foki mai 'a e mole:-12 dB
'Oku tonu 'a e tu'o lahi: ppm 'o e ±10
'Imisi 'o e fakasitu'a'i: 60 dBc
Aonga: dB 'o e ±0.5 (8MHz 'Initaneti (bandwidth))
Ma'u 'a e ului: 25 dB
Ko e konga longoa'a (dBc/Hz)
dBc/Hz@1KHz ≤-80
dBc/Hz@10KHz ≤-90
dBc/Hz@100KHz ≤-100
Ma'u'anga Voltage: 10~ 15V
Malohi lolotonga: 100 Fine'eiki
Hono fakalele 'a e mafana 'o e 'ea kehekehe: +25 ℃

 

Pooti

RF 'I HE: SMA - 50K
KAPAU TE ATU: SMA - 50K
Malohi + 12V: Va'akau
GND: Soldering 'a e lug

Fakatokanga'i ange

1. ʻOku ʻikai fie maʻu ke tanaki atu ʻe he tokotaha fakaului ha amplifier longoaʻa maʻulalo ʻi he ngataʻanga ʻi mui.
2. Ko e sivi'i totonu: tapuni fakafuopotopoto sivi 'i he malumalu 'o e tu'o lahi 'o 2.4 GHz/'Initaneti (bandwidth) 4 MHz, e ongo'ingofua ma'u lava ke ala - 105dBm.
3. 'Oku poupou'i 'e he tu'o lahi 'oku fakahu 1 ~ 3GHz. (Te tau lava ʻo tokoni ke fakafeʻungaʻi).
4. Output frequency supports 300~700MHz. ('E lava ke mau poupou'i 'a e fakafe'unga'i).

Fekauʻaki mo e vitio ʻi ʻolunga:

Ko ʻetau ngaahi koloa manakoa taha ko e wireless vitio transmitters mo e tali. Ka neongo ia, ʻoku fie maʻu ke liliu ʻe ha niʻihi ʻo e kau kasitomaá ʻa e tuʻo lahi hono fetuʻutaki (transmission) ke feau e fie maʻu fakalao fakalotofonuá, ʻi he tuʻunga ko ia ʻoku ʻaonga ai ʻa e konga fakaului. Naʻe kole ʻe ha kasitoma ʻe taha ke mau fakafeʻungaʻi ʻa e tuʻo lahi hono liliu ʻo e RF ki heʻene 2.4 G wireless vitio transmitter. Ko ia ko e tuʻo lahi hono fakahuu ko e 2.4 GHz, ko e tuʻo lahi ʻo e Output ko e 600MHz, and the lowdown frequency is 1800MHz. Naʻa tau faʻu ʻa e sīpingá ʻo fakatatau mo hono ngaahi tuʻunga paú. So I showed him a simple video that showed the 2.4G transmitter and 600Mhz receiver working correctly. Kapau ʻoku ke maʻu ha fie maʻu tatau, hange ko e 1-3G input mo e 300-700Mhz Output, kātaki ʻo fetuʻutaki mai kiate kimautolu ki ha founga ke fakaleleiʻi ʻaki.

 

Ko e hā ʻa e DDC

ʻI he founga ngāue ki he fakaʻilonga fakaʻilekitulōnik, ko ha tokotaha papi ului fakaʻilekitulōnika (DDC) kau papi ului ha mataʻifika, fakaʻilonga fakangatangata ki ha fakaʻilonga maʻulalo ange ʻi ha sipinga maʻulalo ange kae lava ke fakafaingofuaʻi ʻa e ngaahi tuʻunga ʻo e letioo. ʻOku fakatolonga ʻe he founga ʻa e fakamatala kotoa pe ʻi he ʻuluaki fakaʻilonga ʻoku siʻisiʻi ange ʻa e meʻa ʻoku mole ke fakaseʻeseʻe ʻaki e ngaahi fehalaaki ʻi he founga fakafika. ʻE lava ke moʻoni pe faingataʻa ʻa e ngaahi fakaʻilonga ʻo e input mo e Output. ʻOku faʻa hoko ʻa e kau papi ului DDC mei he tuʻo lahi ʻo e letioo pe tuʻo lahi ki ha fakaʻilonga baseband faingataʻa.

Fale

ʻOku ʻi ai ha ngaahi fakamoʻoni iiki ʻe tolu ʻi he DDC: ko ha fakatahatahaʻi fakaʻilekitulōnika hangatonu (DDS), ko ha meʻa sivi maʻulalo (LPF), and a down sampler (ʻa ia ʻe lava ke fakakau ki he filter). ʻOku ʻomi ʻe he DDS ha sinusoid faingataʻa ʻi he tuʻo lahi (KAPAU). ʻOku hanga ʻe hono toutou fakalahi ʻo e tuʻo lahi fakataha mo e fakaʻilonga fakahuu, ʻo faʻu ha ngaahi ʻata ʻoku fakatefito ʻi he fakakatoa mo e tuʻo lahi ʻo e faikehekehe (ʻa ia ʻoku hoko atu mei he ngaahi koloa ʻoku tuʻo lahi hono liliu ʻe he Fourier). The low-pass filters pass the difference (i.e. baseband) tuʻo lahi lolotonga hono fakasituʻaʻi ʻo e ʻimisi ʻo e tuʻo lahi hono tanaki, ʻo maʻu ai ha fakatātā faingataʻa ʻo e fakaʻilonga totonú. Fakakaukau ki ha fili fakapotopoto ʻo e IF mo e LPF bandwidth, ʻoku mathematically tatau ʻa e fakaʻilonga baseband faingataʻa mo e fakaʻilonga totonu. ʻI hono foomu foʻoú, it can readily be down-sampled and is more convenient to many DSP algorithms. ʻE lava ke fakaʻaongaʻi ha faʻahinga filter pe ʻoku feʻunga ʻo kau ai ʻa e FEA, IIR, mo e meʻasivi CIC. Ko e fili angamaheni taha ko ha filter FEA ki he lahi ʻo e decimation (siʻi hifo he toko hongofulú) or a CIC filter followed by an FIR filter for larger down-sampling ratios.

Kehekehe ʻi he DDC

ʻOku ʻaonga ha ngaahi kehekehe lahi ʻi he DDC, kau ai ʻa e tokolahi ʻoku nau fakahu ha fakaʻilonga feedback ki he DDS. ʻOku kau heni ʻa e:

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, pea ko e ola ʻo e fehālākí ʻoku siviʻi pea toe fafangaʻi ia ki he DDS
2. Ko ha pelu fakafuopotopoto ʻa Kosita ʻa ia ʻoku liuliunga ai ʻa e ko au mo e Q pea siviʻi maʻulalo ko ha konga ʻo ha BPSK/QPSK ʻoku pelu fakafuopotopoto

Fakahoko
ʻOku angamaheni ʻaki hono fakahoko ʻa e DDCs ʻi he fakaʻuhinga ʻi he matapa ʻo e ngaahi arrays pe fakaʻaongaʻi pau circuits. Neongo ʻoku lava foki ke fakahoko ʻa e polokalama fakakomipiutá, ngaahi ngāue ʻi he DDS, tokolahi, and input stages of the low-pass filters all run at the sampling rate of the input data. ʻOku angamaheni ʻaki hono toʻo fakahangatonu ʻa e fakamatala ko ʻeni mei he analog ki he kau ului fakaʻilekitulonika (THF) tā sīpinga ʻaki ha MHz ʻe laungeau pe laungeau. 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 hifo ʻa e tokotaha ului ki he 300-400Mhz.

Ne fakalaka atu ʻa e fakatata inverter Siaina Shenzhen fakatau， Tuʻo lahi hono ʻai maí

名称: 图传下变频器
型号: LWDC-248258I
编号: 1805001
RF + 12V KAPAU
Hingoa: RF hifo ʻa e tokotaha ului
Sipinga 'o e: LWDC-3000I
Sipinga 'o e: LWDC-1400
Tuʻo lahi hono fakahu 2G~ 2.7 G(2000~ 2700Mhz)
Maʻulalo Ange: 1800Mhz
Tuʻo lahi ʻo e output: 200Mhz-700Mhz
SN2405002

	MINITI ʻE	FAʻAHINGA	MAKISI
Tuʻo lahi hono fakalelé (MHz)	1300	–	1400	Tuʻo lahi hono fakalelé (MHz)
Oscillator fakalotofonua (MHz)		1000		Oscillator fakalotofonua (MHz)
Tuʻo lahi hono vahé (MHz)	300	–	400	Tuʻo Lahi Lotoloto (MHz)
ʻOku Maʻu ha Tupu ʻa e Uluí(dB)	18	20	22	ʻOku maʻu ʻe he tuʻo lahi kehekehe ʻa e tupu(dB)
Maʻu flatness (dB)		±1	–	Maʻu ha flatness(dB)
Fakatata ʻo e longoaʻa (dB)		1.5	–	Fakatata ʻo e longoaʻa(dB)
Pooti tuʻu fika ʻo e peau VSWR	1.5	1.8	2	Pooti VSWR
Pooti Impedance(ohm)		50	–	Pooti impedance(ohm)
Mālohi lahi taha hono fakahū ʻo e fakama (dBm)		-5		Mālohi Lahi Taha ke Fakahū ʻAkí (dBm)
Mālohi lahi taha ʻo e Output (dBm)		15		Malohi lahi taha ʻo e Output (dBm)
Ngaue voltage (V)	10	12	15	Ko hono fakalele ʻo e voltage (V)
Ngaue lolotonga (Fine'eiki)	130	150	180	Lolotonga ngāué (mA)
Hono fakalele 'a e mafana 'o e 'ea (°C)	-25		55	Mafana ʻo e ʻea (°C)
Tuku'anga koloa 'a e 'ea (°C)	-45		65	Māfana ʻo e tauhiʻanga meʻakaí (C)
Dimension MM (ʻikai ha fetūʻaki (connectors))		62x32x14mm		Dimension MM (ʻOku ʻikai fakakau atu ha ngaahi fetūʻaki)

Customize Frequency Specification Sheet Download

OF 1750Mhz Down

Fika	Fakangatangata
input frequency	2100 MHz ～2500 MHz
Tuʻo lahi ʻo e Output	350 MHz ～750 MHz
Local frequency	1750 MHz
Longoa'a 'a e konga	≤1.5dB
maʻu	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 Interface	N-50KFD
lahi 'o e	108*48*22MM
Power supply mode	Online power supply