XLT-2500 - RF
Contents
1. Volts To select the signal level Video Audiol Audio2 or the carrier level SIGNAL that must be measured press the button when the desired signal is selected its led lights on 6 Connect an audio signal receiver to Subcarrier 1 or 2 output with XLR connector If it is necessary the signal level settings then adjust panel trimmers Trimmer R64 Fig 11 4 The led Bar on front panel furnishes the signal level Volts To select the signal Video Audiol Audio2 signal that must be measured push the button when the desired signal is selected its led is light on For de emphases de insertion connect JP6 jumper for 50us see Fig 11 4 For de emphases de insertion connect JPR6 and JP12 jumper for 75 us see Fig 11 4 XLT 2500 FUNCTIONAL DESCRIPTION The 2 GHz receiver is composed of two fundamental parts D XLT 2500 Microwave TV demodulator XLT 2500 performs the following functions Global signal Video and subcarriers demodulation at 70 MHz Video signal processing Subcarriers signals 7500 8065kHz demodulation As seen in block diagram the circuit is composed of 1 Video and subcarrier IF 7OMHz demodulation stage with Amplification Mixer Band pass filter Demodulator 2 Video processing stage with Low pass filter Delay group pre corrector Adjustable amplification De emphasis circuit 75Q BNC output 3 Four subcarriers demodulation stage with Band pass filter Demodulation Signal at 7500 8065 KHz Adjustab2. PORTABLE MICROWAVE LINK XLT 2500 GENERAL DESCRIPTION The XLT 2500 is a portable 2 GHz microwave link that can carry simultaneously 1 video and up to 2 high quality 15 KHz analog audio programs The audio channels are fully compatible with DB digital audio codes TD 16 and RD 16 2 channels With the XLT 2500 the following performances are guaranteed A V intermodulation is almost canceled System accepts simultaneously video up to 4 digital audio programs and up to 4 x 4800 bps data channels RF frequency channels are easy to change with a 125 KHz steps digital PLL No tuning is required within 100 MHz range All circuits are fitted into boxes suitable to be mounted at the rear of parabolic antennas with direct connection to the microwave feeder DB parabolic antennas enable the direct connection to the microwave feeder without wave guide losses A front panel digital multimeter and alarms permit to check audio and video levels RF signal level PLL lock and squelch status The equipment meets or exceeds the international standards for safety and electrical specifications XLT 2500 User s MANUAL XLT 2500 FUNCTIONAL DESCRIPTION The 2 GHz XLT 2500 transmitter is composed of two fundamental parts I MMT Microwave TV Modulator This is an audio video microwave TV circuit synthesized 1 3 to 2 7 GHz band 2 dBm output with the following functions Video signal processing 7 500 MHz 8 065 MHz subcarrier modulation
3. RF video audio 1 3 to 2 7 GHz 2dBm output power lever As seen in Fig 2 4 the circuit is composed of 1 Video processor stage with 75 a BNC input signal attenuation pre emphasis circuit low pass filtering delay group pre coorector adjustable modulation Video and subcarriers signal addition 1 Up to 2 subcarriers stages with 600 o XLR CANON input balun trasformer adjustable modulation pre emphasis circuit low pass filtering 7 500 MHz or 8 065 MHz modulation band pass filtering 2 1 3 2 7 GHz PLL carrier modulation of video and audio signals 3 System check PLL locking depth modulation measurement and power supply presence II HMT Microwave 1 3 to 2 7 GHz Amplifier It consists of a wide band microwave amplifier in the 1 3 to 2 7 GHz band with 2dBm input and 1W or 5 W output XLT 2500 User s MANUAL Installing XLT 2500 For Installing XLT 2500 receiver perform the following steps 1 Power the device with the cable supplied 2 Remove the first panel 3 On the second panel connect the filter to the feeder Warning RF input level of XLT 2500 must not exceed 30dBm 4 Power on the equipment The ON led on front panels should light up The PLL LOCK led on front panel should light down 5 Connect a video signal receiver with BNC connector in Video output If it is necessary adjust panel trimmer R11 trimmer Fig 10 7 for signal level setting The Led Bar on the front panel furnishes the signal level
4. easured Video Audiol audio2 press the button when the Video signal is selected the led Video lights on 6 Connect an audio signal with XLR connector to Subcarrier 1 or 2 input It may be necessary to set the modulation depth in correspondence of video input signal level and then adjust panel trimmers R12Trimmer Fig 4 5 The value we suggest is 70 kHz peak The led Bar on front panel furnishes the modulation level kHz or MHz To select the signal that must be measured Video Audiol Audio2 press the button when the desired signal is selected the led Audio 1 or Audio 2 on For pre emphases de insertion connect JP5 jumper for 75us Fig 4 5 It can be necessary to adjust the relative level between the subcarriers and the Video signal then adjust R37 R38 trimmers for subcarriers levels and R30 trimmer for Video level see Fig 3 7 in case the regulation of trimmer R41 it is not enough adjust trimmer R30 see Fig 3 7 INSTALLING DMT HMR P For installing DMT HMR P receiver perform the following steps 1 Power the device with the cable supplied 2 Remover the first panel 3 On the second panel connect the filter to the feeder Warning RF input level of HMR must not exceed 30 dBm 4 Power on the equipment The ON led on front panel should light up The PLL LOCK led on front panel should light down 5 Connect a video signal receiver with BNC connector in Video output If it is necessary adjust panel trimmer R11
5. isasbeias todd weer EE eee 7500 8065MHz POWET SUPPLY EE AC 110 220 15 50 60Hz Receiver Characteristics REE Ee ee EE EE 90 to 15 dBm 50Q Video de emphasis by passable 0 0 cece cc ecee ene eee eens enees C C 1 R 625 lines BB Video output levels ee Set Eege 1 Vpp 75 Q Video output CONNECIOF E BNC Audio output level Af 75 kHz peak 3 to 12 dBm 600 Q bal unbal Audio de emphasis bxv passablet cece nent eee ene eee eneens 50 uS 75uS Power am enee elastic aks AC 110 220 15 50 60 Hz Transmitter receiver general data Outdoor operating temperature rang 20 to 50 C Outdoor operating humidity range 0 cece cece cece eee cece eee eneenaeees lt 95 TX RX Dimension W x L XH EE 300 x 400 x 140 mm INSTALLATION INSTALLING XLT 2500 For installing the XLT 2500 transmitter perform the following steps 1 Power the device with the cable supplied 2 Remove the first panel 3 On the second panel connect the filter to the feeder 4 Power on the equipment The PWR led on front panels should light up The LOCK led on front panel should light down 5 Connect a video signal with BNC video input If it may be necessary to set the modulation depth in correspondence of video input signal level then adjust panel trimmer Trimmer R41 The value we suggest is 20 MHz peak to peak The Led Bar on the front panel furnishes the modulation level KHz to MHz To select the signal that must be m
6. le amplification Deemphasis circuit Low pass filter Balun transformer 600 Q XLR CANON output ID XLT 2500 Head Microwave Receiver It consists of a wideband receiver in the 1 3 to 2 7 GHz band with input level range from 90dBm to 15dBm TX AND RX TECHNICAL SPECIFICATIONS Overall IF IF specifications JF sta dard KEE 70 MHz IF standard delay ET EE lt 3ns Overall BB BB specifications 43 dBm at receiver input BB amplitude frequency response 5Hz roOlMlz edsgd within 0 9 dB Video amplitude frequency response SHz to 5 Miz within 0 5 dB Group delay in video band 5 H mo aMlzh ee scene eee e ened within 20ns EE ege Ee eeh lt 2 Differential DNASE dee EE SE Audio channels frequency response 30 Hz tol ktzh cess eens within 0 5 dB Audio channels THD 1kHz OdBM c c500c0 ccscecccebedscsereebeuesdvstseiosstasecese lt 0 3 Transmitter characteristics be ege eege ett ke geen At CCIR 405 1 Frequency degt eege EE 20 MHz pp Output DOWEL ee 2W for HMT 2 2G or 5W for HMT5 2G IF 15 VDC EE ee ee Geet GE N female BB Video input l vel ccs arendrarvedvestocinielia Seen 1 Vpp 75 Q unbal VAG EO APU CONNEC EE EE EE BNC Video preemphasis bvp ssablc ccc ccc e cee ceeeeseee eee eneeeneens C C 1 R 625 lines Audio input level Af 75kHz peak Xe 3 to 12 dBm 600Q bal unbal E eeng E XLR female Audio pre emphasis by passable d coneatudueeldcaus vasavealeadestadwedvaaediays 50 uS 75 uS Audio subcarrier TrequenCles cisb
7. trimmer Fig 10 7 for signal level setting The Led Bar on the front panel furnishes the signal level Volts T o select the signal level Video Audiol Audio2 or the carrier level SIGNAL that must be measured press the button when the desired signal is selected its led lights on 6 Connect an audio signal receiver to sub carrier or 2 output with XLR connector It can be necessary the signal level setting the adjust panel trimmers Trimmer R64 Fig 11 4 The Led Bar on front panel furnishes the signal level Volts To select the signal Video Audiol Audio2 signal that must be measured push the button when the desired signal is selected its led is light on For de emphases de insertion connect JP6 jumper for 50 us see Fig 11 4 For de emphases de insertion connect JP6 and JP12 jumper for 75 us see Fig 11 4
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