Broadcast Warehouse TX 150/300 Technical Manual Download Page 37 | Manualshive

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Broadcast Warehouse TX 150/300 Technical Manual Download Page 37

TX FM Transmitter technical manual

page 37

Technical data

3.533

Combo board, PLL exciter section

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Summary of Contents for TX 150/300

Page 1: ...r written permission from Broadcast Warehouse The information and specifications contained in this document is subject to change at any time without notice Copyright 2001 Broadcast Warehouse For the l...

Page 2: ...umpers 2 52 Multiplex Broadband Input 2 53 Stereo With Limiters 2 54 Stereo With Limiters Disabled 2 55 Mono From Two Channels 2 56 Mono From One Channel 2 6 Other Setup Considerations 3 Technical dat...

Page 3: ...ing accuracy nor mally only found on expensive test equipment Local and remote personal computer control and metering are achievable via the innovative dual method RS232 interface The FM modulator sec...

Page 4: ...Failure to do so may increase the risk of equipment failure shock and fire hazard R F The N type R F power output socket contains R F voltages which may burn or present a shock Please make sure that t...

Page 5: ...type pin out Pin 1 PLL failure alarm O C Pin 2 Reserved Pin 3 Reserved Pin 4 R F failure alarm O C Pin 5 R F failure alarm TTL Pin 6 Mod failure alarm TTL Pin 7 PLL failure alarm TTL Pin 8 R F Mute C...

Page 6: ...down buttons will allow power control if internally allowed The maximum output power is governed by the maximum power set adjustment see R F pwr control section If the frequency is set internally wit...

Page 7: ...s 8 represents 100 KHz on the 12 5 KHz switch 8 x 0 125MHz 0 1MHz 100KHz The LCD display on the front panel will display the frequency that you have set on the internal switches If you try to adjust t...

Page 8: ...allow the LCD screen to provide adjustment of the R F power down from that maximum power set point This can be desir able in transmitter hire situations where you wish to govern the maximum output to...

Page 9: ...RS232 MODULATION FAILURE The Modulation failure alarm will be set if during normal operation the peak deviation of the transmitter drops and remains below 16 KHz The 16 KHz alarm level allows the alar...

Page 10: ...rom your computer can be plugged into the expansion boards 9 way D type socket The above item is an optional extra and is available from broadcast warehouse and it s distributors 2 42 Windows applicat...

Page 11: ...transmitter will respond to certain key presses and each one has a certain function See the list below for details of what key to press for each function The most important key press is the enter key...

Page 12: ...in as an example You press the R F mute key o and then press refresh screen key ENTER to get a status update The transmitters power control circuitry may not have had time to turn the r f power down i...

Page 13: ...o 2 5 MODES OF OPERATION The transmitter is fully configurable and can be set up to support various modes of operation The mode of opera tion is set by the configuration of the internal jumpers This c...

Page 14: ...here are two different standards in use worldwide In Europe and Africa the standard is normally 50uS This represents a lift of about 3dB at 3 KHz and 10dB at 10 KHz In the Americas and in Japan more b...

Page 15: ...on This one jumper controls both channels because the gain reduction control voltage which this jumper disables is common to left and right Even with the limiter disabled you may still wish to use the...

Page 16: ...er module and to the back panel multiplex output BNC socket See loopthrough mode below JUMPERS J1 ON J2 3 50 or 75 J4 5 LOUD or CLARITY J6 7 ON J8 ON J9 10 ON J11 ST J12 OFF Stereo with internal limit...

Page 17: ...the signal from the internal limiter and stereo encoder to an external piece of equipment before being reinjected back into the transmitter via the multiplex input socket The most common application i...

Page 18: ...boost loudness The gain controls on the back panel control the input drive to the limiter module and can be set so that limiting occurs for a given input level Factory setting is at maximum to enable...

Page 19: ...uld now have the multiplex and pilot setup at the correct level All that is left to do is to set the input gain controls to your desired settings For most applications where you require a compressed l...

Page 20: ...t any form of level control apart from the peak level clippers so we can set the system internal levels correctly 5 We should check that any offsets internal to the limiter are nulled out to keep dist...

Page 21: ...5KHz peak deviation at 400Hz The pre emphasis filter can put the 15KHz audio 17db higher than 400Hz We strongly advise you to ensure pre emphasis is built into any external equipment if you decide not...

Page 22: ...vel feed you may have to turn the gain controls down to stop internal clipping occurring prior to the limiter Please see note on pre emphasis at the end of the section You may also wish the limiter to...

Page 23: ...evel required to achieve limiting is frequency dependent due to the characterisTics of the pre emphasis curve There is 17dB more gain into the limiter with a 15KHz input signal compared to a frequency...

Page 24: ...se as simple as possible FREQUENCY FINE TUNE WARNING ADVANCED TECHNICIANS ONLY While the frequency is controlled by the phase locked loop system the stability is governed by the stability of the refer...

Page 25: ...vals 20 175 TX150 30 300 TX300 N type 50 ohm better than 65 dbc 75 dbc 87 5 108 MHz 100KHz from LCD or 12 5 KHz from internal switches Internal switches or LCD system Dual speed Phase locked loop 500...

Page 26: ...ht audio signals are applied to balanced input XLR sockets on the back panel The balanced audio signals are fed to IC1 IC4 which are configured as differential amplifiers to convert the balanced input...

Page 27: ...is buffered by output op amp IC15 which also provides a fixed output level of 6dbu which is fed to the multiplex output BNC socket on the back panel as well as to one side of the loopthrough jumper J1...

Page 28: ...impedance step up as well as proving a DC feed to the transistors drains via a center tapped winding The DC power applied to the center of RFT2 comes from the main adjustable power supply module whic...

Page 29: ...ORTD s 8 bit s are interfaced to the 8 bit data bus of the LCD display The data byte on PORTD can be latched into the LCD display by the LCD control bits on PORTC PORTE 3 bits has the remaining A D in...

Page 30: ...TX FM Transmitter technical manual page 30 Technical data B of the op amp...

Page 31: ...TX FM Transmitter technical manual page 31 Technical data 3 3 BLOCK DIAGRAM...

Page 32: ...manual page 32 Technical data 3 4 WIRING AND INTERNAL OVERVIEW Wiring details W1 yellow green 16 0 2 W2 blue 24 0 2 W3 brown 24 0 2 W4 red 24 0 2 tri rated W5 yellow 24 0 2 W6 black 24 0 2 tri rated W...

Page 33: ...TX FM Transmitter technical manual page 33 Technical data 3 51 LCD control board...

Page 34: ...TX FM Transmitter technical manual page 34 Technical data 3 52 Power amplifier board...

Page 35: ...TX FM Transmitter technical manual page 35 Technical data 3 531Combo board limiter section...

Page 36: ...TX FM Transmitter technical manual page 36 Technical data 3 532 Combo board stereo encoder section...

Page 37: ...TX FM Transmitter technical manual page 37 Technical data 3 533 Combo board PLL exciter section...

Page 38: ...nsistor SW1 3 BUTTONS Blue buttons CON1 10W IDC IDC boxed header CON2 16W IDC IDC boxed header LCD1 122x32 NAN YA LMD62S042JM 3 62 Power amplifier board RESISTORS R1 1K8 3K6 sot 1 4 Watt Metal Oxide R...

Page 39: ...ch C27 82pF Ceramic Plate 2 5 pitch 680 C28 100n Y5V Monolithic Ceramic 2 5 pitch C29 100n Y5V Monolithic Ceramic 2 5 pitch C30 27pF Ceramic Plate 2 5 pitch 680 C31 12pF Ceramic Plate 2 5 pitch 680 C3...

Page 40: ...8 Watt Carbon Film R9 10K 1 8 Watt Carbon Film R10 470R 1 8 Watt Carbon Film R11 33K 1 8 Watt Carbon Film R12 1K2 1 8 Watt Carbon Film R13 1K2 1 8 Watt Carbon Film R14 330K 1 8 Watt Carbon Film R15 33...

Page 41: ...R111 SOR SORT ON TEST R112 10K 1 4 Watt Metal Oxide R113 10K 1 4 Watt Metal Oxide R114 10K 1 4 Watt Metal Oxide R115 10K 1 4 Watt Metal Oxide R116 10K 1 4 Watt Metal Oxide R117 10K 1 4 Watt Metal Oxid...

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