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Link XP L2102/L2104 Receiver Instruction Manual Issue 1 - October 2003 Page 23 of 48
Link Research Ltd. 23/24 Watford Metro Centre, Dwight Road, Watford, Hertfordshire, WD18 9XA, England. Tel: +44 (0) 1923 200 900
Registered in London No. 2074604

Web:

www.linkres.co.uk Fax: +44 (0) 1923 241 357

L2102 & L2104 Receiver

Instruction Manual

Using diversity antennas, considerable performance gains can be made in a number of
ways. The classical deployment of diversity antennas requires two antennas to be mounted
11 x ¼

λ

apart. For a transmitter operating at 2.5GHz the theoretical spacing is around

33cm, but good results can be obtained by using spacings varying between 20cm up to 2

metres. If it proves difficult to arrange this, greater spacing can be used with very good

effect. It pays to experiment with different spacings and positions to get the best results.

The performance of the system may vary when a stadium is empty from when it has a full

crowd in it.

Using the example shown in figure xx above, the two antennas would be mounted side-by-

side near the centre line and high up in the stadium structure.

Diversity reception is not just confined to two antennas. By using a Link 2104 receiver, up
to 4 antennas can be used and the receiver will take the best signal to build its output.

This has considerable advantages if the camera is required to track players’ progress from

the dressing room down the tunnel and out onto the pitch. By placing antennas in the

dressing room, half way down the tunnel and in the normal positions for covering the pitch,

excellent results can be achieved.

2.1.3 LinkXP and other Manufacturers’ antennas

The LinkXP wireless camera system will work with antennas of non-Link manufacture, but

as many of these are based on lossy printed circuit elements and thin coaxial cable,
performance may be disappointing.

2.1.4 Mounting antennas

Five general rules should be applied to all antenna installations:

•

Mount antennae as high as possible. A couple of metres can make a considerable

difference.

Figure 29 – Link L3010 with

complimentary directional antenna
mounted on the front

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Содержание L2102

Страница 1: ...Page 1 of 48 Link Research Ltd 23 24 Watford Metro Centre Dwight Road Watford Hertfordshire WD18 9XA England Tel 44 0 1923 200 900 Registered in London No 2074604 Web www linkres co uk Fax 44 0 1923 241 357 L2102 L2104 Receiver Instruction Manual User Manual L2102 L2104 ...

Страница 2: ...rted Plugging up the System 9 1 2 1 Controls and connections 9 1 2 2 Mounting the L3010 9 1 2 3 Setting the down convertor attenuation and local oscillator 10 1 2 4 Non diversity system 11 1 2 5 Diversity system 12 1 2 6 Dual diversity system 13 1 3 Turning on and setting up the receiver 14 Section 2 More Advanced Operation 21 2 1 Antennas 21 2 1 1 The receive antenna 21 2 1 2 Diversity antennas 2...

Страница 3: ...4 Ultra Low Delay Integrated Receiver Decoder 39 Physical 39 Mounting 39 Environmental 39 Power 39 Power Consumption 39 Front Panel Controls and Indicators 39 Rear Panel Connectors 40 Audio Output option choice between 5 way XLR or 12 way connector block 40 Video Outputs 41 Video Inputs 41 Analogue Audio Output 41 Input Signal Level 41 3 2 Upgrading the unit 42 3 2 1 Upgrading model types and opti...

Страница 4: ...m or as a stand alone receiver it gives unrivalled performance in a very compact footprint The system is very simple to set up using the front panel controls allowing rapid change of frequency and system reconfiguration In addition the unit can be controlled by the hand held infra red IR controller L9020 The internal design of the receivers is extremely compact using state of the art components an...

Страница 5: ... a full description of the problem leading to the failure Return the receiver to Link Research at the address given preferably in the original packaging and enclosing a full fault report wherever possible The unit will be repaired and returned as soon as possible Repair times should be short but if you must have a replacement unit immediately then you can take advantage of our advance replacement ...

Страница 6: ...iness equipment IEC 60950 International Safety of information technology equipment including business equipment UL 1950USA Safety of information technology equipment including business equipment The equipment has been designed to meet the following EN 55022 European Emission Standard equipment class A EN 55103 2 European Generic Immunity Standard FCC USA Conducted and radiated emission limits For ...

Страница 7: ...d navigation of the menu system Stores system parameters after they have been set Exit button Allows upward navigation of the menu system Cancels any parameter changes made restoring the previously stored value Up button Allows upward navigation in a sub menu Down button Allows downward navigation in a sub menu Left button Returns the user to a higher level menu and allows movement to the left whe...

Страница 8: ...4 RF input from L3010 down convertor Power output for L3010 22kHz tone output for control of L3010 9 way D sub socket Remote Alarm Data RS232 remote control port Alarm signalling firmware upgrade BNC 75Ω bayonet socket ASI out ASI transport stream output BNC 75Ω bayonet socket Video Video output BNC 75Ω bayonet socket Frame lock Delays the output signal by up to 40ms to lock the video frames to an...

Страница 9: ...d be mounted so that the two connectors are facing downwards This will help to prevent water ingress In areas of very heavy rainfall the L3010 should be mounted inside a waterproof protective cover The L3010 must be mounted as close to the receive antenna as possible with a maximum cable length between antenna and down convertor of 1 metre When using Link Research antennas N type elbows are used t...

Страница 10: ...h settings are as follows Switch Default setting Description Gain setting switch S1 Last setting Changes the down convertor attenuation Hi Lo switch S2 Hi when lit Selects local oscillator to be used by the system Set to Hi for 2 3 to 2 7GHz Set to Lo for 1 95 to 2 3GHz ID switch S3 and S4 User selectable Not currently used The local oscillator frequency will need to be set to match the correct fr...

Страница 11: ... up to 75 With no LEDs lit there is no attenuation and this condition should only be used for very long cables or where the signal is very weak The receiver front end has no protection with this setting 1 2 4 Non diversity system This is the simplest system and the receive side only requires 1 antenna and down convertor to make it work The performance over short distances will be good but not as g...

Страница 12: ...m giving better performance than non diversity especially when the installation is indoors The transmission range is not increased very much but performance near the margins of the transmission area is much more robust and RF black holes are eliminated Generally the antennas should be placed as high as possible and in the clear see section 2 on antennas for more information The antenna spacing is ...

Страница 13: ... Down convertor Receive antenna 20 100cm spacing Figure 7 Diversity system Outputs from the receiver can be taken from SDI out or video out or both and audio from the mulitway connector block or 5 way XLR depending on which option is fitted If required a synchronising signal can be input to Frame Lock to synchronise the output with other equipment 1 2 6 Dual diversity system Dual diversity can be ...

Страница 14: ... possible and in the clear see section xx on antennas for more information The antenna spacing is fairly critical and should be around 20cm to gain optimum performance If a greater spacing than 20cm is used the full benefits of diversity will not be obtained A little experimentation may be needed to find the optimum spacing in a particular environment Connect the receiver as shown in the diagram b...

Страница 15: ...ndicator will light if there is no valid input signal the red ALARM indicator will be lit To enter the menu system press the button nearest the bottom right corner of the display The display will now look something like the illustration below Status LNB ON Figure 10 Status menu top level Press the down arrow until the down unit menu is shown and press enter to select it Press the down arrow until ...

Страница 16: ...as been selected it will be necessary to go to the down convertor local oscillator set up page The display should look something like the illustration below DConvLO 1 8400GHz LNB ON To change the local oscillator setting press the enter key and change to the new value Press the enter key again to store the new setting and then press the escape key to return to the Demodulator 1 menu NB It is not p...

Страница 17: ...se are automatically carried forward from the Demodulator 1 menu When setting up an L2104 it will be necessary to repeat the frequency selection steps detailed above for demodulator 3 Demodulator 4 will follow the settings made in demodulator 3 Next use the down arrow key to select the LNB power menu The display will look something like the illustration below LNB Power No Figure 15 LNB Power Scree...

Страница 18: ...tton select digital and confirm the selection by pressing enter again Channel B audio is set up in the say way from the Baudio O P menu If the signal being received is scrambled it will be necessary to set up the descrambling menu To do this select the descrambling menu 6 down arrow presses from Status and a screen like the illustration below will be shown Figure 18 Descrambling screen By using th...

Страница 19: ...l be displayed Figure 20 Signal quality status display L2102 The bar graphs give an indication of the relative signal quality of the decoded MPEG packets In operation it is quite normal that the bar graphs fluctuate wildly If the receiver is to be powered off the settings will be retained in the current memory When powered up again it will use these settings unless another memory is recalled to th...

Страница 20: ...key and all the settings will be stored for easy recall To recall a previously stored configuration go to the Memory menu press enter and then use the down arrow to select the Load config option The screen will look something like the illustration below Load Config Figure 24 The load config screen Press enter and the display will change to something like the illustration below Config Figure 25 Con...

Страница 21: ...tage of this by only taking signals from their front In analogue systems this can be done by building Yagi arrays or using horn type antennas that are very directional and give good performance because they reduce the effect of multiple path signals by eliminating them If the transmitter is moving there must be an operator to steer the receive antenna so that it tracks the transmitter accurately A...

Страница 22: ...Such an antenna would be described as having 6dBi gain The polar diagrams of such an antenna are shown below Figure 27 Polar plots for ideal receive antenna with 6dBi Vertical on the left and horizontal on the right One such antenna should give good coverage of a sports stadium if mounted as shown in the diagram below Mount receive antenna in this region Likely area of coverage Figure 28 mounting ...

Страница 23: ...it Using the example shown in figure xx above the two antennas would be mounted side by side near the centre line and high up in the stadium structure Diversity reception is not just confined to two antennas By using a Link 2104 receiver up to 4 antennas can be used and the receiver will take the best signal to build its output This has considerable advantages if the camera is required to track pl...

Страница 24: ...l be used in temporary locations so jubilee clips cable tie wraps gaffer tape etc are likely to be used So long as the antennae are held firmly and vertically they should work well 2 1 5 A some practical examples Example 1 The requirement was for coverage of a rugby final in a national stadium The Director wanted the following Coverage of the pitch for all the match action and the pre match entert...

Страница 25: ... as high as possible and would have given a bigger area of RF coverage Temporary antenna mountings need to be away from potential crowd tampering Cables from down convertors to receiver can be up to 300 metres if using the correct type of cable The distance between antennae is not critical for diversity reception It is a great advantage to be able to try out a number of alternative antenna locatio...

Страница 26: ...re pump up mast Initially they were left hanging below the bar so that they were in free space However it was found that the wind disturbed them too much so they were firmly fixed onto the crossbar alongside other existing antennae The cameraman was based in a small rigid inflatable dingy and moved freely around the water both in and out of the marina Live coverage of racing was reliably achieved ...

Страница 27: ...inferior performance to good cable of the wrong type and both will provide less than acceptable results 2 2 2 Cable impedances Two different cable impedances are used in wireless camera systems The transmit system will use 50Ω coaxial cable and the receive system will use 75Ω cable It is vital that the two cable types are not mixed up or system performance may be disappointing As supplied Link rec...

Страница 28: ...s 43dB To find out what this equates to in the real world look up the attenuation per 10 metres at 900MHz in the manufacture s data tables Dividing this figure into 43dB will give the maximum cable length in 10s of metres 2 2 4 Cable types Ideally the receive antenna should be mounted directly on the down convertor see figure 31 Where this is not possible the shortest length of cable should be use...

Страница 29: ...r in a figure of eight to equalise the stresses on the cable construction and terminations should be capped to prevent damage to the connector as well as moisture ingress When installing cables either permanently or temporarily two simple rules should be followed Do not place pressure on the cable cable ties too tight or heavy objects holding it down as this deforms the dielectric causing a change...

Страница 30: ...emory location 3 Config 4 Stores the current settings into memory location 4 Config 5 Stores the current settings into memory location 5 Config 6 Stores the current settings into memory location 6 Config 7 Stores the current settings into memory location 7 Config 8 Stores the current settings into memory location 8 Store Config Config 9 Stores the current settings into memory location 9 Config 1 L...

Страница 31: ...ing used the figure is automatically entered from a menu setting in the Unit menu For down convertors from other manufacturers enter the local oscillator frequency here see supporting documentation for details High Selects the local oscillator output mix for the down convertor Used with Link down convertors LoSide Low Low Selects the local oscillator output mix for the down convertor Used with oth...

Страница 32: ...asurement taken at the time the return key is pressed To update the reading the menu must be exited and then re entered PostBER None Post viterbi error rate automatically detected from the incoming signal The reading shown is an instantaneous measurement taken at the time the return key is pressed To update the reading the menu must be exited and then re entered OFDM Demod 1 Pkt Errs None Packet e...

Страница 33: ...horities for appropriate regulations Guard None Automatically picked up from the incoming signal When a value is displayed here it is an indication that the receiver is locked to an incoming signal No Automatically detected the receiver is not locked to any incoming signal Lock Yes Automatically detected the receiver is locked to an incoming signal Modulation None Automatically detected from the i...

Страница 34: ...od 4 Demod 3 and 4 work in the same way as Demod 1 and 2 Service List of available services Shows the service name of the service to which the receiver is currently locked Pressing enter brings up a list of available services which can be scrolled through Pressing enter selects the new service If the receiver is not locked No Service is displayed and a DEC error warning flashes on the display Defa...

Страница 35: ...lows delay or advance of the framelock in the range of 0 9999 pixels 5000 is the centre of the range 1 pixel approx 74 63 nano seconds Locked None Shows when the receiver is locked to a valid input signal Yes or No will be displayed according to the status 625 Sets the output video standard to 625 lines at power up Pwr Up Line Std 525 Sets the output video standard to 525 lines at power up Freeze ...

Страница 36: ... RF1 and one to RF2 RF3 and RF4 can also be connected in the same way This gives the most reliable performance because it is not affected by flat fading Dual Diversity Four antennas are connected one each to RF1 RF2 RF3 and RF4 This acts as two independent diversity systems Remux Where more than services are input they can be remuxed together to create a single output stream Bypass 1 For engineeri...

Страница 37: ...ets the remote control interface to infra red LCD Contrast None Allows the contrast of the display to be varied in 8 steps Off Allows full control of all settings on the receiver Lock On Allows the User to scroll through the menus but will not allow any changes to be made to settings A padlock symbol is shown on the display when Lock is on Soft version None Displays the version of the currently in...

Страница 38: ...or direct mounting to a flat surface or flat adaptor plate for universal pole mounting brackets NB To ensure the unit is water resistant it must be mounted with the input and output connectors facing down Environmental 20ºC to 55ºC Power Input range 10VDC to 30VDC supplied via coaxial cable from receiver decoder Power consumption approximately 3 5W excluding cable loss Lower Panel Connectors N typ...

Страница 39: ...ble steps of attenuation each of 10dB o Manual switching inside unit L2102 L2104 Ultra Low Delay Integrated Receiver Decoder Physical 210 x 227 x 44mm Small form 1RU 19 rack width 1 7kg weight Black spray painted steel enclosure Mounting Free standing Two units rack mounted side by side with optional bridging kit Single unit rack mounted with 10 5 1RU mount option Environmental Ambient 0ºC to 70ºC...

Страница 40: ...o UHF input 470MHz to 860MHz o 24VDC output to power up convertor limited to 400mA per connector o Short circuit protected Frame lock input o 75Ω BNC connector ASI out o 75Ω BNC connector SDI out o 75Ω BNC connector o Serial digital video with embedded audio Video out o 75Ω BNC connector o Composite video out 1V pp o PAL or NTSC Remote Alarm Data L2104 o 9 way D sub connector o Alarm output o Remo...

Страница 41: ...bedded audio o SMPTE 259M Rec ITU R BT 656 3 Composite Video o NTSC with and without pedestal or PAL I o REC ITU R BT 470 4 o Signal to noise ratio 56dB ASI out o DVB ASI Burst and Byte mode Component video o YUV 625 525 Video Inputs Frame Lock o Composite Black and Burst input for timing reference o Frame store added o Delay increased by 0 40mS Analogue Audio Output Two stereo pairs or 4 mono cha...

Страница 42: ...profiles will not be affected Units may be upgraded by returning them to Link but in addition field upgrade by the User is a straightforward procedure 3 2 1 Upgrading model types and options The model type plus the firmware options fitted are upgradeable by changing the unit s licence code To do this contact Link to obtain the required upgrade code This 12 character code is generated at Link and i...

Страница 43: ...l 44 0 1923 200 900 Registered in London No 2074604 Web www linkres co uk Fax 44 0 1923 241 357 L2102 L2104 Receiver Instruction Manual Figure 36 Link website download page Figure 37 Download and save screen 3 2 3 Upgrade procedure The terminal program TeraTerm is needed to install the software This can be obtained from the site http hp vector co jp authors VA002416 teraterm html ...

Страница 44: ...44 0 1923 241 357 L2102 L2104 Receiver Instruction Manual Figure 38 TeraTerm start up window When TeraTerm is opened it will show a window like that above Choose the serial option and configure it for a valid COM port This will then open another window as shown below Figure 39 TeraTerm setup screen From the Set up drop down menu choose the serial port option to access the port configuration menu s...

Страница 45: ...n the screen dump and click ok The L1000 must be connected to the PC with a serial cable minimum connections 2 2 3 3 and 5 5 between the chosen COM port and LinkXP equipment data port With the unit un powered hold down the left and right arrow keys simultaneously on the front panel apply the power and continue to hold the keys down for a few seconds If the connection is successful the following pr...

Страница 46: ...23 241 357 L2102 L2104 Receiver Instruction Manual Figure 42 downloading in progress Once complete the progress window will disappear and a short time later 3 5 minutes the message Finished will appear on the terminal screen The updated code is now ready to execute at next power up N B If the power is interrupted at any stage during this process the new code will not be loaded In worst cases the u...

Страница 47: ... Fax 44 0 1923 241 357 L2102 L2104 Receiver Instruction Manual 3 3 Block diagrams 3 3 1 L2102 L2104 Receiver block diagram LNB power RF separation Antenna 1 Antenna 2 Tuner Filter Demodulator RF RF RF Diversity decoder Digital Signal Processing Front panel interface Transport Stream Analogue or Digtal audio out C202 or C203 C201 C210 Analogue or Digital video out Transport Stream out as ASI Power ...

Страница 48: ...nkres co uk Fax 44 0 1923 241 357 L2102 L2104 Receiver Instruction Manual 3 3 2 L3010 Down convertor block diagram Amp Amp Amp Amp 10dB switched attenuator Mixer 10dB switched attenuator 10dB switched attenuator DC block control data separator Switched mode power supply Program mable interface controller PIN select switch Switch inputs for attenuation and Hi Lo oscillator S band input UHF band out...

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