DIPOL Weekly Review - TV and SAT TV, CCTV, WLAN

No. 11/2013 (March 11, 2013)

Polymer image sensor straight out of the future.

Austrian researchers have developed a completely new concept of capturing images. They came up with the idea of ​​using polymers to build a device that is flat, flexible and transparent. The device is similar to a flexible plastic sheet or film.
The world's first flexible and transparent image sensor [www.osa.org]
The main objective of this technology is to create gesture-driven interface, which, being transparent, can be overlaid on any image display (TV, monitor etc). The users will be able to control their devices and applications e.g. games without any additional motion tracking devices such as cameras - the interaction with the displayed image will be the result of interfering the light reaching the sensor.
Comparison of the image projected on the polymer sensor and that reconstructed by the researchers [www.osa.org]
The new device, in the form of a flexible plastic film, uses fluorescent particles that react to the incoming light (of a specific wavelength, e.g. "blue") by re-emission of portions of light with a longer wavelength, e.g. "green". They are partially scattered, but the rest passes through the polymer film in the direction of edges to an array of photosensitive sensors framing the sheet. The output signals are processed and the result is the reconstructed image (so far monochrome).
Since the polymer sheet is not divided into pixels, the processing of the signals is based on the phenomenon of attenuation of the optical paths the light travels through to reach the sensors. By measuring the brightness of the light reaching each sensor of the array, it is possible to evaluate the position of the activated point.

Switches in optical systems.

When creating a fiber-optic network and the interface between copper and optical installation, it is important to choose appropriate devices. In order to link two LANs based on copper UTP cables, the installer should consider one of the two basic solutions: using a pair of media converters, or two switches equipped with SFP modules. It is also possible to combine both types of the devices, i.e. an Ethernet media converter on one side and a switch with SFP module on the other. An example of a system with a fiber optic link connecting two subnetworks is shown in the diagram below.
Managed Switch: TP-LINK TL-SG3210 JetStream (8x10/100/1000Mbps, 2xSFP 1000Mbps)SFP Transceiver: ULTIMODE SFP-203G 2xLC (two single-mode fibers up to 20 km)Patch Cord (made to order) SFP Transceiver: ULTIMODE SFP-203G 2xLC (two single-mode fibers up to 20 km)Web Smart Switch: TP-LINK TL-SL2210WEB 8+2G 1xSFP RACK
An application of TP-Link switches with ULTIMODE SFP modules
The 8-port Fast Ethernet switch N29949 supports four IP cameras. Its 100 Mbps ports are fully sufficient even for most advanced cameras. The gigabit SFP port has been equipped with L1415 SFP module to connect the network segment with the main part of the system employing N29959 switch with identical SFP module. The N29959 switch with eight gigabit ports allows for comfortable operation of the NVR and several workstations. Its second SFP slot can be used in the future to connect another LAN subnet, e.g. with cameras installed in a new building.

Amplifiers for MATV systems distributing DVB-T signals.

The main problem with the reception of digital terrestrial TV channels is often a large difference in the levels of the received signals, even 10...15 dB. The difference could increase in the distribution network due to the different attenuation of lower and higher frequencies by coaxial cables, so the final imbalance in subscriber outlets is likely to exceed the maximum acceptable value of 12 dB. The problem can be solved by the application of channel amplifiers.
Twin Channel Amplifier: Terra at420 (UHF, analog TV & DVB-T, AGC)
Four-channel Amplifier: Terra at440 (UHF, DVB-T, AGC)
Twin VSB Multi-standard Modulator Terra mt420 (ch. 6-12, 21-69, S1-S40)
Twin Channel Amplifier Terra at420
(UHF, analog TV & DVB-T, AGC)
Four-channel Amplifier Terra at440
Multiband Amplifier Terra ma400
Key features of Terra channel amplifiers designed for DVB-T:
  • best selectivity in the market - the gain out of the selected channel at the frequency 2 MHz from the channel border is 40 dB lower than the maximum gain, which means amplification of the required channel only - in contrast to many other solutions where typically the gain at the frequency 16 MHz from the channel border (as much as 2 channels!) is only 16 dB lower than in the case of the target channel;
  • at420/440 amplifiers with 85 dBuV output level are ideal for multiswitch systems – other launch amplifiers often feature excessive output levels for this application and require to use additional attenuators;
  • modular concept of Terra systems allows for easy injection of analog channels by analog modulators such as mt410 R82515 and/or "private" DVB-T multiplexes by digital modulators such as mdx420 R82518;
  • four-channel amplifier Terra at440 at440 R82511 amplifies four DVB-T multiplexes taking little space in the installation box;
  • low power consumption;
  • AGC - automatic equalization of signal levels at the output.

How to transmit video from several analog cameras via a single coaxial cable?

An installer had to send signals from additional three security cameras, but he could use only one existing coaxial cable. There was no permission to install any additional cables.
We have offered the solution shown in the diagram below. The signals from four v-cam 450 M10749 cameras are provided to the inputs of 4-channel RF modulator Mixpol MDP-4S R95163. The modulator converts the baseband video signals into RF TV channels. The combined signals from the output of the modulator are transmitted via a 75Ω coaxial cable similarly to television signals in antenna systems and can be monitored by any TV set. Due to the requirement to record the video footage from the cameras on DVR ( M72604 ), the RF signals are demodulated by a pair of double AV demodulators R87204.
CCTV Network DVR: TREND 260X04 (H.264, 4 channels)Double AV Demodulator (TV Tuner): Mixpol DTV-02Double AV Demodulator (TV Tuner): Mixpol DTV-02Quadruple RF Modulator MIXPOL MDP-4S (ch. 1-69)UHF TV Antenna: Dipol 44/21-69 Tri Digit ECOVandal Proof Camera: v-cam 450 (600 TVL, Sony Super HAD II CCD, 0.01 lx, 2.8-12mm, OSD, IR up to 30m)Vandal Proof Camera: v-cam 450 (600 TVL, Sony Super HAD II CCD, 0.01 lx, 2.8-12mm, OSD, IR up to 30m)Vandal Proof Camera: v-cam 450 (600 TVL, Sony Super HAD II CCD, 0.01 lx, 2.8-12mm, OSD, IR up to 30m)6-Way Splitter R-6 Signal2-Way TV/FM Splitter R-2 Signal
Diagram of a CCTV system using RF modulators to transmit video from 4 analog cameras via a single coax.
The images can be watched on any TV and recorded on the DVR after demodulation of the RF channels.

Initial configuration of IP Sunell cameras.

IP Sunell cameras K1620, K1630, K1660, K1665, K1670, K1680, K1690, K1691, K1695 have default IP address By connecting more than one camera to the same switch we cause an IP address conflict, which will effectively prevent access to the cameras via a web browser. The communication with each device separately and manual change of every address is rather an ad hoc solution that is not recommended in the case of multiple cameras.
Device Search Tool window from IP Search utility for network configuration of Sunell IP cameras
In the case of larger systems, the problem can be overcome by using IP Search utility. It searches for all IP Sunell cameras in the LAN and allows for quick change of their IP addresses so as not to cause conflicts. The application enables the user to change the subnet mask, gateway address, DNS server, login and password for each camera. The Device ID function allows for naming each camera depending on e.g. its location.

Temperature stabilization in RACK cabinets.

The R912006 thermostat automatically closes the circuit powering fans when the ambient temperature exceeds a set value. The device usually controls fan panels (e.g. R9120261, R912026, R9120264) installed in RACK cabinets.
Thermostat (for fans)
The thermostat can switch on the power circuit at 0...60oC and can be installed on DIN R912006 rail
Fans for RACK cabinets:
R9120261 R9120262 R9120263 R9120264
3 fans, 4U 2 fans, 4U 3 fans, 1U 4 fans, ceiling-mounted
New products offered by DIPOL:
Access Point Ubiquiti NanoStation Loco M5, 5GHz CPE
Patch Panel (1U, 24x BNC(f)-BNC(f) )
UPS CyberPower DX850E
Ubiquiti NanoStation Loco M5,
Patch Panel
1U, 24x BNC(f)-BNC(f)
UPS CyberPower DX850E
230 VAC, 850 VA
Worth reading:
One satellite receiver, two televisions. Home users who have one satellite receiver and use two TVs rarely decide to buy another receiver. However, they may easily have access to all the channels from the receiver by application of the wireless transmitter/receiver set Signal T-1 R94115, operating in 2.4 GHz band. The set is designed for wireless audio/video transmission and extended communication with the remote control of the receiver (from the second room). The AV signals from the receiver can be transmitted to the second room over a distance up to 30 meters... more
Wireless transmitter/receiver set Signal T-1 (A/V + IR, 2.4GHz) R94115
Distribution of DVB-T and analog signals via optical fiber. Modern shared antenna systems based on the distribution of TV and radio signals via optical fibers provide much more flexibility compared to those using coaxial cables, especially in terms of the lengths of transmission lines... more
Distribution of original DVB-T multiplexes and trans-coded PAL channels (after COFDM-PAL conversion)
in a fiber-optic MATV system
Splitting CCTV signals. To display images from CCTV cameras in the guard booth, the video from the cameras has been split into two paths. The second path feeds the video to a DVR located in a well protected room in other building... more
Splitting CCTV signals into two paths
Mobile Sat Dish: Camping 35 (offset)