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Video systém

analog PAL

Obrazový vysílač/přijímač 1VAP - s kabelem a RJ45 (pro CVI,TVI, AHD, Analog,2ks)
Kód zboží: M16659
Cena bez DPHCena s DPHSlevaplatnost  
233,51 Kč282,55 Kč0 %
Video transformátor TR-1Qs BNC redukcí-výprodej
Pohled na transformátor
Video transformátor TR-1Qs BNC redukcí-výprodej
Pohled na balení
Set je navržen pro přenos videa a napájení z jednoho zdroje pomocí kabelu s kroucenou dvojlinkou. Každá ze dvou jednotek je vybavena zásuvkou RJ-45, BNC konektorem a napájecím konektorem 2.1/5.5.

The baluns match the impedance of coaxial video output/input (75 ohm) to the impedance of the balanced line (100 ohm), ensuring proper video transmission via cat. 5 twisted pair cable from many types of cameras:
  • PAL (CVBS) up to 400 m
  • HD-TVI, AHD up to 200 m (720p) or 150m (1080p)
  • HD-CVI up to 200m
Specifikace:
Name1VAP
CodeM16659
Range (video)
400 m
Insertion loss
-0.5 dB (f=5 MHz)
Bandwidth0 ... 50 MHz
CMRR (dB @ 5MHz)50
Input/output impedance (coaxial)
75 Ω
Input/output impedance (UTP)
100 Ω
Coaxial connectors
BNC male
UTP connections
RJ-45 female
Weight0.02 kg
Dimensions (W x H x D)15x33x24 mm
BNC lead (length)
14 cm
DC power lead (length)
14 cm

 

CMRR in video transformers (baluns). "Balun" is the short for "Balance-Unbalance", in CCTV applications meaning a transformer for changing the transmission medium from a coaxial cable to a twisted pair, and vice versa. The biggest advantages of using balanced transmission cables are lower costs, higher resistance to external interferences, and possibility of using longer transmission lines. Due to identical arrangement of the two wires of a balanced line, the interferences are also the same and can be cancelled in a differential balanced input of the receiver. It is not possible in the case of a coaxial transmission line.
The ability of a video transformer to cancel the common interferences identical in both wires is characterized by Common Mode Rejection Ratio (CMRR). It is the ratio of the error signal at the asymmetric output of the transformer to the interference on the both balance inputs. The parameter can be measured, for example, by applying high, common interference signal Vz to the both balance inputs (i.e. shorted, to eliminate a differential signal). Under such conditions, an ideal transformer would not provide any signal on its unbalanced output, but the real device will demonstrate a Vb value. The CMRR is calculated using the following formula:
CMRR = 20*LOG(Vb/Vz)
The CMRR of Etrix baluns (in the 15 kHz to 6 MHz range) is 60 dB. It means that they attenuate the common signals (interferences) 1000 times.
Cena bez DPHCena s DPHSlevaplatnost  
233,51 Kč282,55 Kč0 %
 
Obrazový vysílač/přijímač 1VAP - s kabelem a RJ45 (pro CVI,TVI, AHD, Analog,2ks)
Kód zboží: M16659