SEN-6 Subaudible Encoder Manual
Contents
1. vec 10 0mc 5 1 picl6c84 f84 power pins o pinl4 Vec 5VDC R70 pin 5 ground Package 18pin DIP 1k USA t 1 16 x PNP 10k d 33k 27 Kis 379v La Triauer Us 6g 39k usos V aaa Y MCLR RBO L e 3 14 R57 100k 27 RB Ee gt a osci RB2 8 4 YE i Osc2 RBS IHi Trisgsr S Ern 49 NEC2501 Four Frequency SUBGEN R59 190K RAT Ree L2 R62 fis Tk usc R O 100k AE VRE s 12 by CircuitWerkes mas FIT Rag R87 PES K R61 190k Disable Coma Trigser sy 7 NI Shift LED LEE al eee Z J Zz i S 10 mane I i i 1k E Ko UBA PEEL NEC2501 f R79 R77 B g pa b a an Wan 15 zl 2 R86 usp Uss z 10 10k 33k 5V PE 14 NEC2SO 3 Disan m gt I z Ka 2 In vob 1a Ls2. Ors ik 9 o Bn Ox BIC G B amp Qio OlR2 Oy 2 FF a 8 B n put SL US sgg sm5mun sey a o MO 4 55 aH n o5 o Power 17 go gt zm SH 9 HES 24V AC DCK B wen oH e rS Ken o OQRecO P 6 3 9 6 3x9 Om o Low o oc 9 1k Tone m o 0 5 70 des e 9 bront panel trigger Hi e e SECTS my 9 geide HL 2 power LED Grounding TUIS 7 NE ape B ys E 9 0 Pos o n activates enit o90 zu 1 X 6 R78 9 0 2 0 Trio o Ke RAS Pls K ront panel cm d 1 sk R77 3 9 eB Busy LED g coo x ET 4 Je o oj E Output uses o Lie E as on during e qo808000 o 40509 indicato o 9 zig 10 tones Indicators EA T Us ps 2501 4 o ec ooon La n0908086 g lol EET g oor LO o g 9 SI o 66 mi oo Db gH gie oF s BH 9 g 9o o B J7 Remove to dA Bi ME SI conr 121 e EO i S MCN KL E oo B disable activate ello Boo o connector 95 E ext Disable g 29 8 SN GR Tone o a a ag ms duration 55 1k Sene El 8 o RES High f selector EET High frequency 3 i5 B Tnotch tune tos us J predi 5 o x e BH o zyggz0 Teit FED ae 3 g 5 Ono prt o t na prt oi S E iba ET Mode Select i DB Ral Ti asna E 90 e somo R ossgae n WG to audio present sas one S aE BIG e j 8 indicator or o Level ES O0 0 0 0c69 Oco go O Oik r510 a 8228 9
3. Ene Raw PWM Out U2c d C29 O039uF n PWM Filter Q Copyright 1999 CircuitWerkes All Rights Reserved U2a b CircuitWerkes 3716 SW 3rd Place Gainesville Fl 32607 yeu fax 380 0230 Title SEN 6 Block Diagram Size Document Number REV A Date April 15 1999 Sheet of 1k R102 0 oon n oo B SEN 6 Mute PCB Layout K R32a o00 47K o R103 9 Gad 1N914 amp Bog o Olio n O R1019 o EN3818 Ta JFET N 8 1 m nunmnu C10 SEN B Tone Mute PCB 1989 CircultWerkes 330k SEN 6 Componant Locator
4. 3v 1 as OR LZ R76 usc NEC2501 ces t 68 Sop CE R 5 ROT 3 GNpb Zs amp Sk L 1 7 Le Sink c31 18k TUF MAX7403 R63 cas fur RBO cee l NEC2501 e be p Tk el C 0039uF R RIF Jea Eet 3 yed 5 J c Je 1 s E nrs aa Seo dde TT pep peri hok pasc T T lt SHIFE Sink mea Is pea 1 c26 jumpers select tone duration ES R103 1 Tur c27 Fik PENES 1 pus 1N914 tur R89 T RL i Riga i Daughterboard R101 Y 330k 7m cipi Assembly 247k TI 101 LAE Low Freq Filter Section PEU nee 1 RIS 1 l UID 1 i ernes C anar ra E E 3 E a NE a so ga Rig wo Tk E A E 2 Subsudible Buffer Gain Stage viv pee S J3 182 and J4 2 amp 3 both filters in UB 47k 330k 47k TLO74 34 182 Low filter only eS RI7 U3 283 and J4 2 amp 3 high filter only 10k TLO74 R31 c4 c 50k pt15 R54 pea ipud TAE ouz l G Dui pP Ja RI7a 1 lg o2 47UF a i i i 12V 2uF Low filter 1 fil gain 4 2m R50 Sach RUE zo Tana Gan Only Dui RIS SOk m t is S10 TLO74 47 Ohm x o i4 R22 R23 R24 5k 2 our E A R49 ig 47k 330k 47k 1k 2 ce 2 RIO 18 R45 E High Yup n2 t Frequency High filter 47uF 47 Ohm E ae c Note Filter cap values c4 09 Filter shown are for artz c ESD tes S5 Peas are 172 of Section R35 the nominal for 25 35Hz PE Tk sA g u2D Audia Out igp gi R44 14 L R is V 47uF 47 Ohm DE TLO74 47k RB 47k R38 Input Level RI R3 ig uic Adjust 10k 1k bi Input 10 0k 10 0k 3 3np Sl clip Raz Warning 12V 10M cNt RS T
5. 9 Mode Jumper conral xi audio removes tone presen connector indicator or Hom main Input Output input output LED clip clipping LED rieeeeeusu a Fag 100K E 5 be he be N 9 9 o on 9 esr 7 6 9 9r a 000000000000 jag aF ol FE S 5 2 dE IERE BEEE Low high amp 1 Tone Level E shifted cc Vd Set Mai Tone nable oUtpul duration P m Only input gt selector Input ucio n de pe indicators oe ae Output Connector npu eni grounded connector Set ai if J7 is off Note The front panel of the SEN 6 has an LED indicating tones being generated and a single LED for power 4 Db 9 as seen looking at front of device l 5 4 3 2 1 O O Q O O 9 8 7 6 O O O 1 Lo tone trigger 6 Ground 2 Hi tone trigger 7 Shift sink 3 Combo tone trigger 8 High sink 4 Shift 9 Low sink 5 Enable Connections on the Db 9 parallel those on the screw terminals CircuitWerkes Subaudible Tone Encoder Audio Wiring Diagram Important note about phasing There are two important characteristics to consider about the S EN 6 1 The notch filters exhibit significant phase shift at low frequencies You should not use the SEN 6 on stereo program lines unless you have one on each channel Also whe
6. E M o R28 16 ce xx 0 F a 59 ag E input clipping sv Hi m o 75 0090090A 0 6 eog SR R P eig gs J s agay B R70 nna LR a 9388 9 o s 8392 t i o o Citas 8 5522 g Audio 7 U zl Jumper removes S T 2 4588 d n E 2252 3 Input tone from main 9 6 0 a nds ot 8 8 gge a 1 i e 10 0 OJR1 Input 3 On KO Low frequency l zoo c notch tune Gain 2 99 Bm qu 10dB input pad Jig N Normally not iem x needed 2 i Output S 98 Level sok aaa mane LED When flashing indicates audio is within 3dB of clip point into 600 Ohm B oo i c E oad Clip point is 3dB higher into bridging 4 LEID t E K amp BR 95 es a a 28 o Wa P de Ee L amp 56 gez 2285278 3 az 857 Jt W lt lt alog CAE Main Output o O0 lt 8 183 Baad BEE POPE D ie Ae cap mf A uoco Q deod O gp 1962 s gug Z8 5828528 Main 0 OME w ara D co0 0mn o 3 gt Zo yT o DU 5 gaa 88 ane prag Gr SZ 8982 to n 8z Z Output o oio igi Ni wip of ER P v gt aa 28 55 g6 j 3e SBR 6 80 OQ 99 RE FP go zog 92 Bg 8e8e S 2 z amp Es zs8 3 Er T o O ico gy ses g g82 325 one az E BR ae m Sarp ip 38 m a8 a 4 39 a Only i e 3 B 5 2 Roi E sz g g d so o 98 Output 8 8 3 3972 P 0 0 9 uer 6 us GP L TE L Test Mode o N g7 a 9g 3 95 SEN 6 Subaudible Tone Encoder Schematic
7. normal program material but WITHOUT lighting the LED in clipping mode on peaks After the input is set adjust the output level control for the desired output amplitude This control is variable from 0 to about 16dBm The input and output clipping indicators light about 0 to1OdB below the actual clipping threshold however unprocessed audio usually has peaks exceeding 10dB above reference so if these indicators are flashing with program peaks you probably have distorted output The audio presence LED initially turns on at around 20 25dB below the input clip level The subaudible tone amplitude is controlled only by the tone level control Neither the input or output level controls affect the tone gain One way to set the tone level is insert a tone or program audio at normal levels amp set the input control until the audio LED is on most of the time in presence mode but not on at all in the clip mode Next set the output control for the correct output amplitude Remove the input audio and set the tone level control for the correct usually nominal pgm level or a little more output level Remember tones must be undistorted and at least 10dB hotter than any underlying program material to work properly While tones may not have to be sent at 10dBm neither should they be sent at 20dBm Tones can always be monitored amp measured at the tone only output connector SEN 6 Connector amp Controls Layout Top View InputLED Test Mode Db
8. LO74 U R40 pS 3 3k is v B DE K PE R9 55 1 R46 Ues Audio In input Pad T lf 5 1k od t R43 p2 h uP 10k 1458 input clip Tk gs 1 v4 R2 R4 cg RI2 R13 78 15 u10 lx 2 2k 1N914 R ji 100k VI vo SLS Z uF 1458 10 0k 10 0k 3 3np 10M 8 YE quon T E i F c21 NE iour aL aL Fisvde Li TE u3 Regulated Supply Outputs us 1 LM7805 S EPRE PER Ban NIN 100uH FFS 613 2 1000F VI g VO CHE CAP OSC xo AP SDN 8 T Four GND VOUT T Sue ME ETE CircuitMerkes ors 3716 SW 3rd Place pT 102 I Em Voltage Inverter oiinssvilla Kis 32907 2 E S http www circuitwerkes cam W Note C35 36 amp 37 ar bypass caps at the 5675 amp 4093 352 335 6555 fax 380 0230 7 F 7 WE F e ritis gt S 3 Tone Subaudible Encoder S u b E one E nco d er Size Document Number EV c ats June 30 1999 Sheet Tof 1 Alignment Levels Audio levels can be adjusted with the front panel audio pots Input and Output Start with the Input levels and feed the unit with normal program audio Adjust the input until the input audio presence LED flashes with about 50 7046 duty cycle with the incoming audio it can flash more if the audio is densely processed Output audio should be adjusted for desirable levels into your program path If the red Out Clip LED is illuminating at all you are getting within 4dB of clipping on peaks If this same LED is not lighting but your audio out is distorted you are probably driving the input too hot Check for
9. SubAudible Tone Encoder Model SEN 6 CircuitWerkes Technical Manual CircuitWerkes 3716 SW 3rd Place Gainesville FL 32607 352 335 6555 Fax 352 380 0230 http ww circuitwerkes com e mail info circuitwerkes com 1995 1999 CircuitWerkes All Rights Reserved All information contained within is proprietary No part of this manual may be reproduced or copied without the express written consent of CircuitWerkes The CircuitWerkes Subaudible Tone Encoder Description The CircuitWerkes Subaudible Tone Encoder is a single channel tone generator capable of encoding 25Hz 35Hz and 25 35Hz combination tones for signalling and remote control of automated systems over satellite RPU and other media capable of passing subaudible signals The unit has individual inputs for 25Hz 35Hz and combination tone generation In addition to standard 25 and 35Hz tones the SEN 6 can with external filtering generate 50 75 and combination 50 75Hz tones Outputs are provided forlow tone high tone and shifted 50 75 tone mode An LED indicator on the front of the box illuminates any time a tone is being sent The SEN 6 is designed to be the last device in an audio chain and all program audio should be passed through the SEN 6 Internal notch filters eliminate subaudible content from the program material The audio input can accept balanced or unbalanced audio at input levels of 20dBm to 8dBm The output is balanced t
10. a flashing Input Clip LED and set the input gain control for the maximum gain that does NOT cause the input clip LED to flash Filters All adjustments to the encoder assume 25 and 35 Hz signal encoding The process for setting 50 and 75 Hz encoding is identical except of course for the frequencies and one jumper When setting up for 50 75Hz operation it is assumed that you will still want to encode 25 amp 35 Hz so compromise frequencies of 29 5Hz and 62 5 Hz have been selected to give roughly equal attenuation at 25 35 50 amp 75Hz Note however that the maximum attenuation at any one frequency achievable using only the two internal notch filters is about 17dB which may not be acceptable if your program material contains significant amounts of music or other subaudible content If you are planning to use the 50 75Hz options we suggest leaving the two low frequency filters set and use an external EQ before the SEN 6 to roll off audio below 100Hz The filter sections are tuned at the factory with standard reference tones and should not need further adjustment by the user However if the need unexpectedly arises to tune these circuit sections you will need a scope or analog audio level meter that has good display characteristics at low audio frequencies a signal generator or known accurate 25Hz and 35Hz signal source and an accurate frequency counter if your signal source is a continuously adjustable device most are The frequency counter c
11. an be left hung across the signal source for fine tuning the frequency of the signals being fed during the alignment process The audio level ofthe tone source should be between 10 and 8 dBm If the signal is unbalanced be sure to tie ring and sleeve on the input connector to the unbalanced source s shield To Tune the filter sections set the generator or signal source for the operating frequency ofthe filter being tuned and adjust the associated multiturn pot for minimum audio the null point at the main output A properly tuned filter will attenuate the notch frequency by 40dB or more R16 adjusts the low frequency and R26 adjusts the upper frequency If R26 is adjusted for 63 or 75 Hz J9 should be removed to match the gain through that stage J3 and J4 set which filters will be on line You can select low only high only or both If you are only using one tone greater low frequency response and less low frequency phase shift can be obtained by using only the filter for the desired frequency However removing one filter from the circuit inverts the output phase so care should be taken to avoid out of phase mixing downstream J3 amp J 4 Filter select High frequency o 8 i Key filter gain set E gz o J3182 amp J 4 263 both filters in wi foo
12. by Ulc and sent to the low frequency notch filter Uld The output of the low frequency filter goes to the high frequency notch filter Ula A series of jumpers J3 amp J4 allow the user to use one or both notch filters Program audio with subaudible content removed is then fed to the output mixer buffer amp U2c amp d Control inputs and indicator outputs are generated by the microcontroller and buffered by TIL 199b optocouplers The subaudible tones are first generated as raw PWM in the microcontroller From there tones are levelled and pre filtered then passed to a switched capacitor low pass filter which removes the PWM distortion The tones then go to a daughter board which mutes the first few milliseconds of tone and then ramps the audio up to full amplitude avoiding pops when the tone is first produced By ramping up the tone audio detection is improved on some decoders Output from the mute circuit is sent to buffer amplifier U1b The output of U1b is sent directly to the tone only output jack and through J2 to the main output buffer where it is mixed with the program audio Low Notch Filter Hi Notch Filter U d Ula Output Buffer Amp 2 J20 Test Mode u 1 Micro Controller Control Inputs j R55 Optocoupler Tone Generator control buffers Enable Indicator Outputs Buffer Amp Q2 OO39uF K Frequency control
13. closures except at pre determined windows If J7 is removed the SEN 6 must have a connection between the enable input and ground for itto outputtones J7 simply parallels the external input connector If J7 is on the default the SEN 6 will operate whenever its input is activated Finally in addition to the screw terminals a D 9 connector duplicates the control and signal functions See page 5 Indicator outputs for for low tone high tone and shifted 50 75 tones are ground sinking optocoupler outputs These outputs are rated at 24V and 100mA If higher Voltages or more current is to be switched an external slave relay is highly recommended Audio input gain output level and tone insertion level are controlled by front panel pots An LED indicator is provided to show you when audio is present and when both input and output clipping are happening Jumper J2 removes subaudible tones from the program path when off A second output jack labelled Test Mode Out contains only raw subaudible tones minus program material By removing J2 and monitoring the Test Mode Out connector you can test and adjust the level of your tone generator without getting tones on the air or removing the encoder from your air chain J5 selects whether the Input LED detects presence or input clipping Tone duration is user selectable via J6 from 75sec to 2 secs via the 5 position jumper When all positions are un jumpered the encoder produces a 10 second tone for tes
14. n mixing filtered and unfiltered program paths you will experience some cancellation of frequencies below 150Hz 2 The actual output phase is directly related to the number of amplifiers that are cascaded In the SEN 6 one amplifier is used for each of the filter sections so removing one filter rotates the phase by 180 degrees The input and output are in phase with one amplifier removed If you use the SEN 6 in the factory default mode with both filters in place the output will be out of phase so be sure to wire your output jacks accordingly Input 1 4 TRS phone PLUG ZU STIP SLEEVE RING Tip is Balanced or Unbalanced In Ring is Balanced in Sleeve is audio ground and should be connected to your source s ground If your audio is unbalanced you should drive ring and tie tip to sleave for proper operation Note that the audio will be in phase with the output when both filters are used default OUE PDE 1 4 TRS phone PLUG are TIP SLEEVE RING Tip is Balanced Out Ring is Blanced Out Sleeve is left floating and may be tied to ground on the other end Do notconnecteither driven output or directly to ground These outputs are short circuit protected butprolonged shorting will cause overheating and may also degrade audio performance Short Theory of Operation Input audio is buffered
15. ransformerless and can drive a 600 ohm load Subaudible program content is typically attenuated by 40dB at the audio output and it is short circuit protected Installation amp Setup CONNECTIONS Connections to the subaudible tone encoder are fairly straight forward Your audio passes through the encoder via the Audio In and Main Out jacks When the input is unbalanced the input lead should be tied to ground and the input driven via the input Power inputs are brought out to both barrier strips and a coaxial power connector Both of the power connectors are in parallel with each other so only one power source at a time can be connected to the SEN 6 Power is provided by the included wall wart Connection can be made to either port depending on which type of adapter was supplied with your encoder The SEN 6 as is the case with most CircuitWerkes products uses an internal bridge and Voltage regulators so it can be powered with any supply of 17 24 Volts AC or DC capable of delivering 150mA All control inputs are opto isolated and require simple ground closures to operate Indicator outputs are also opto isolated and and operate whenever their specific tone is generated An additional barrier strip position is for the encoder enable function This input is active if Jumer J7 is removed When J7 is removed and there is nothing connected between the enable input and ground no tones will be produced This feature lets you prevent accidental
16. rpose Some states do not permit limitation or exclusion of implied warranties therefore the aforesaid limitation s or exclusion s may not apply to the purchaser This warranty gives you specific legal rights and you may also have other rights which vary from state to state Note Although every effort is made to make our technical materials complete and accurate manuals are frequently updated in order to improve them All specifcations and information contained herein is subject to change without notice The latest version of this manual is available online at the CircuitWerkes internet web site The address is http www circuitwerkes com E mail may be sent to info circuitwerkes com 10
17. ting SETTING LEVELS The SEN 6 can accept a wide variety of input levels and its output driver can supply peak levels of up to 16dBm into a 600 Ohm load Decisions on how to set levels are based on how you will use the encoder but one cardinal rule always applies Tones must be at least 10dB hotter than surrounding program material in order to be reliably detected Actually we recommend that tones not be transmitted over other program material at all However you may be able to transmit tones over music buffers as long as the music has faded by 10 to 20 dB before the tone is generated This should only be tried if automatic ducking is employed and or the tones are automated so that they only occur over tightly controlled and repeatable program events that have been shown to be reliable Although it might also be possible to reduce your normal program material by 10 to 20dB and transmit the tones over unfaded programming we would strongly recommend against trying that You would pay a penalty in excess noise from reducing your peak program levels Also there is a lot of room for misadjustment of individual decoders downstream The SEN 6 has a maximum dynamic range of about 90dB By selecting the highest input level that does not cause clipping of the input stage you will get the maximum signal to noise ratio from the SEN 6 Audio input gain is controlled by R7 and should be adjusted until the audio presence LED is flashing most of the time with
18. x 4 1 amp 2 low filter only gaos 96 21 J3 2 amp 3 amp J42 amp 3 high filter only oj Pese olos 6992 ge Sm High Frequency estes notch filter adjust fe se fe 21 Be g Low Frequency s eo 2 T notch filter adjust OtuF sige REPAIR OR SERVICE INFORMATION In the event of the need for service or repair call CircuitWerkes at 352 335 6555 for a Return Merchandise Authorization number RMA Then carefully package the unit along with a note of the problem and send it to the address below Clearly indicate the RMA number on the outside of the box We cannot accept returns without an RMA Be sure to include your address not a PO box telephone number and best time to call CircuitWerkes ATTN CUSTOMER SERVICE DEPT 3716 SW 34 Place GAINESVILLE FL 32607 CircuitWerkes Limited Warranty This product is warranted against defects for two years from date of purchase from CircuitWerkes and CircuitWerkes authorized distributors Within this period we will repair it without charge for parts and labor Proof of purchase date required Warranty does not cover transportation costs or a product subjected to misuse accidental damage alteration except as authorized by CircuitWerkes improper installation or consequential damages Except as provided herein CircuitWerkes makes no warranties express or implied including warranties of merchantability and fitness for a particular pu
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