Link Research Frequently asked questions

There could several reasons for this.

1) Link control not installed or wrong version
2) Wrong Cables connected
3) The LINKXP is in IR mode. To change mode hold the RF button and power on. Check for Comms.

Make sure the 6 pin lemo on the connection box’s to the L1103 XP in secure and make sure that L1103 XP is not in infrared mode.

The second audio on the L1103 XP needs to be switched on, you can do this by using link control.

By using the DATA/Remote cable that we provide with each kit, you plug the cable into the RS232 6pin lemo of the connection box of the L1124 XPR or L1125 XPRV, then you go to the front panel menu display of the L1124 XPR or L1125 XPRV and scroll down to the unit part of the part of the controls and press enter.

The first sub menu option you come across is RS232 press enter and scroll until you get XP Control and select. Then you should have full control of the XP, then all u have to do is open link control.

The external microphone and the camera microphone power and the second audio need to be switched on, this can be done by going to the front panel menu display of the L1124 XPR or L1125 XPRV and scroll down to forward path and press enter.

You scroll down in the sub menu until you see camera audio, external audio and audio 2 and going into there sub menu and switching the power on.

The items displayed in the menu depend on the camera type being used. 

ICL                   Iris Close Limit
IOP                   Iris Open Limit
DTL                   Detail ON/OFF
RGM                  Red Gamma Level
BGM                  Blue Gamma Level
GGM                  Green Gamma Level
SHUT OFF/ON     Shutter
SHT/100-2K       Shutter Setting
RFL                   Red Flare Level
GFL                   Green Flare Level
BFL                   Blue Flare Level
A KN ON/OFF      Auto Knee ON/OFF
DTL                   Detail Level
NDFILT 1-4         ND Filter Wheel (If Motorized)
CCFILT 1-4        Colour Filter Wheel (If Motorized)
COL                  Colour Temp (Used only for Philips Cameras)
DPD                  Level Dependency ON/OFF
DPND                 Level Dependency Value

Below are the UHF  Channel allocation pre-loaded into the L1124 and L1120 camera backs for reverse control.

Frequency Range: 450 - 470MHz 
Occupied Bandwidth: 25 KHz
Power: Up to 100mW - 2W (in 100mW steps)
Modulation: GMSK
Step Size: 6.25 KHz (10 KHz option at time of ordering)

Usually the FCC will give you an emission designator based on the above
parameters, we have previously been given;
20K0F1D as a designator

FCC document 47CFR90.210
Note 2, bottom of first page;

"Operations using equipment using a 25 kHz bandwidth will be authorised a 20 kHz 
bandwidth."

XPR(V) Control Mode Settings The following list explains the function of the "Control Mode" bit on the XPR(V) for different camera types.

For Camera Control Firmware version 6.56.

Sony 550
 '1' is used with Sony 600 Camcorders; 
 '0' is used with BVP-90, BVP-550, etc. 

Sony 950/E10/E30
 '1' Full Iris Range
 '0' Half Iris Range

Sony DXC-D35/50
Aspect Ratio Switch (Only for cameras that do switch) 
 '1' 16:9
 '0' 4:3
 
Ikegami (Handheld or Studio)
 '1' Tally command for Studio cameras (HL-355) 
 '0' Normal Tally Command

Ikegami (1-way)
 '1' Studio cameras 
 '0' Handheld Cameras, 
      
LDK- x00:
'0' 8 bit iris data
'1' 12 bit iris data

Modulation Rates and Triax transfer Rates 

The table below shows the encoded data rate with the relevant modulation Standard at with Guard Interval 1/32

Calcultion for Triax Usage

For Triax use, typical the Remodulator  L2150  an the output is set to 64QAM at Forward Error Correction) FEC 7/8 This Gives a maximum transfer rate of 31.67 Mb/s 

NOTE:- If there are transmission errors due to long cables, low spec cables, multiple connections, it may be necessary to increase the error correction  (with reduced data rate)

Typical Cameras, for maximum reliability, the FEC is set to and FEC ½ and Guard 1/16. So the typical encoders rates per camera system are shown below:-

So you can use as many camera systems to fill up the required bandwidth (typical add approx  2-3mb/s for service data etc. ) For instance 4 QPSK camera systems or one 16QAM and 64QAM.

Please follow the link. This information can also be found in the manual section of this website.

Teledesign transceivers are used as the radio link for the camera reverse control. The Teledesign software is used to change the TX frequency in the L1252 Data Transmitter and the RX frequency in the L1124/L1120 camera backsp>

Download Site

Teraterm software is a terminal emulator program that is used to download code updates into almost all of Link Researches Products.

Download site

http://hp.vector.co.jp/authors/VA002416/teraterm.html

Check the link in the support page.

Download the following file for generic information:-

http://www.linkres.co.uk/assets/firmware/86/Firmware_Uploading_Instructions.zip

Check specific release notes for the individual products.

Link's EBS Scrambling.

EBS is a fixed key system. The algorithm uses a 32-bit fixed session key to seed two maximal length linear feedback shift registers configured to form pseudo random binary sequences. These registers are of different lengths with secure polynomials. The shift registers are seeded with the session key and also with several elements from the transport packet headers to increase security. The transport elements include the current continuity count and the scrambling bits. All data packets are encoded
The key bits and packet header elements are mixed in a random fashion prior to seeding. The algorithm is tolerant to null packet insertion and deletion and produces a transport stream which can be remultiplexed.

The algorithm re-synchronises on every packet so lock is re-acquired immediately in the case of packet loss. This ability to re-lock immediately is important for wireless camera operation, where packet loss due to poor RF reception can be commonplace.

The EBS scrambling operates within the multiplex/demultiplexer blocks of the Link Research's professional encoder/decoders.

The EBS scrambling system is unique to Link Products,  and as a result  it is unlikely for any third party product to break the scrambling.
EBS is a free standard option with Link Research's Professional products ie LINKXP.

It is not available on the non-professional products. LinkXPe

BISS-1 and BISS-E (Basic Interoperable Scrambling Systems)

BISS-1 and BISS-E are standard scrambling systems and were designed to provide a security mechanism which offers interoperability between equipment of different DSNG vendors.  BISS-1 is based on the DVB-CSA specification, with the additional use of fixed clear keys (session words) and was designed for use specifically for DSNG operations.   BISS-E (BISS with encrypted keys), introduces tan additional mechanism to accept the insertion of Encrypted Session words, while at the same time, conserving interoperability.

All Link Research's encoders have a fully interoperable implementation of BISS-1 and BISS-E and are available as software licensable options.

Neither BISS-1 nor BISS-E is implemented in the L2000 Decoder/Receiver range.

Resume:-

BISS-1 and BISS-E is a fully interoperable licensable option on Link Encoders and typically used when operating with third party equipment in standard data transmission applications.

Link Research's EBS System is a secure, unique, scrambling system specifically designed for Link Research's wireless camera products. It is simple to use and a free option with all professional products

Click here to run the L3020 RF Propagation Calculator. This is the same for the L3070.

Click here to run the L3010 RF Propagation Calculator

IPAQ Information

Background
Software for controlling LinkXP L1100 Series Encoder  is available for handheld devices running Windows CE operating system. Communication is via Infrared or RS232 Serial Port. For optimum reliability and PDA compatibility, Serial Port operation using an RS232 cable is recommended, if available (note that not all PDAs have a serial port). There are two levels of instructions, user level or diagnostic mode.

Supported PDA Devices
The software has been tested with the following devices:-
   Compaq 3600 (Pocket PC 3.0)
   Compaq 3800 series
   Compaq 3900 series (Windows CE 3.0)
   HP 5500 series
   HP H4150 (Windows CE 4.20)
   Dell Axim X50V (Windows Mobile 2003 2nd edition)
   Fujitsu Siemens Pocket Loox 720 (Windows Mobile 2003 2nd edition)
   HP iPAQ hx2490 (Windows Mobile 5.0)
It may also operate with other Windows CE/Mobile based handheld devices.Currently, Infrared compatibility issues exist with the Ipaq H1940 (Windows CE 4.20) and some other PDAs.

Software Download.
Software is downloadable free but does not necessarily have support if used on other devices. If downloading the software, please feel to comment support@linkres.co.uk

Note: On current software, it is no longer necessary for Users to enter  a license key to activate Link Control. For old version of the software a special demonstration key is now available to activate the software.  When prompted enter the following:

Company name:             Link Research Ltd
The license key of:          L8ZFTGLPE9QY   

should then be entered and this will activate the software.

No, but we do have a list of hire companies and the systems they have in the support section of this website, alternatively click here.

Call support on +44 (0) 1923 474099 or email support@linkres.co.uk