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1. SS Transmitter CLA 40A L 5168 E d FM Limiter STL STL Symmetrical Transmitter Receiver Stereo Generator R Audio CLA 40A R R in Transmitter FM Limiter STL STL Symmetrical Transmitter Receiver SCA CLA 40A FM Limiter Sub Carrier Generator FM Transmitter wah MARTI CLA 40A Positive to negative peak ratio is set by the selection of the value of R13 normally 4 7K R13 Ohms 4 K 6 8K 10 0K 12 0K 15 0K 20 CK Approximate Asymetrical Peak Ratio 1 35 15 340 14 23 220 1315 1 10 CLA 40 COMPRESSOR LIMITER AMPLIFIER ADJUSTMENT AND TEST PROCEDURE CA 40 AGC MODULE ADJUSTMENT 1 Remove the CA 40 module from the CLA 40 unit Remove the CA 40 module cover Referring to the figure below initially set the four potentiometers as follows R 20 fully counter clockwise R17 and R21 approximately mid range R2 fully clockwise Compression Threshold Adj VVR Bias Adjust R 2 R 17 Meter Cal F E T Adj R 21 R 20 alala 2 Set CLA 40 controls as follows Meter Switch to 10 VU Compress Limit Switch to compress limit out Input Lever Control to maximum clockwise position Output Level to maximum counter clockwise position Input Pad to O DB AM FM Switcn to SYM position Apply a 400 Hz audio signai at O DBM level to input terminals Connect a 600 ohm load resistor to out
2. e s a Compression Ratio Automatic Gain Control Range Release Time Attack AM FM Operation shielding and RF Filteringe Operating Temperature Physical Dimensions AM or FM Characteristics selectable Strap two together for stereo For high performance FM limiting the CLA 40A should be driven by another CLA 40A operating as a wide range AGC amplifier Three control systems used Symmetrical peak limiting for FM selectable asymmetrical or symmetrical peak limiting for AM Peak limiting level adjustable 600 ohms balanced or unbalanced 15 to 20 DBM 20 DBM RMS 50 Hz to 15 KHz flat within 0 5 DB in AM or FM mode 40 DB 66 DB Ref 10 DBM output FM Mode Less than 1 THD at all compression levels Symmetrical limiting Better than 10 1 40 DB dynamic Adjustable 800 milliseconds 2 sec 5 sec approx Less than 1 microsecond in compress limit mode Gain Reduction output level 4VU 1lOVU Both Standard 75 microsecond pre emphasis de emphasis used in FM operation For use in high RF fields 20 C to 50 8 9cm 48 5cm x l4cm 3 x 19 x 55 rack panel 115 230 volts 50 60 Hz 10 watts 2 4 kg 6 lbs e TEST REPORT MODEL CLA 40A SERIAL NUMBER DAT
3. RRA CRA CLA 40A COMPRESSOR LIMITER AMPLIFIER FRA GRA Gee hne f A GRA CRA ERA CRA CRA CRA CRA OARA WARRANTY Except as otherwise provided in this section the equipment described herein is sold under the following guarantee Marti agrees to repair or replace within a one l year period and without charge any equipment or parts which are defective as to workmanship or material and which are returned to Marti at its factory transportation prepaid and properly insured provided a Notice of the claimed defect is given Marti within one 1 year from date appearing on invoice and goods are returned in accordance with Marti instructions b Equipment accessories tubes and batteries not manufactured by Marti are subject to only such ad justments as Marti may obtain from the supplier thereof c Equipment or accessories shall not be deemed to be defective if after examination by Marti or its appointed representative the equipment evidences damage from moisture improper han dling installation or operation d In the event that Marti is required to demonstrate equipment capability either as to specifications or defects in parts or workmanship and where it is found that the equipment meets specifications Marti shall be entitled to collect all reasonable expenses from the Buyer including but not limited to travel per diem living expenses and hourly wage rates which have been established by Marti and which are in effect at the ti
4. input to the CLA 40 is accomplished as follows With the controls set as in 4 above reduce input level until no gain reduction is shown on the meter Set modulation monitor for positive peak monitoring With voice program audio note positive peak modulation level Reverse audio input terminals 1 and 2 of TB and again note positive modu lation level Select termination phasing that produces greatest positive peak modulation o Increase input level to the desired gain reduction reading on che meter This completes the AM adjustment procedure FM OPERATION lL Set controls initially f ilows Input Pad ODB Mode Switch FM Limiter Switch Svm Symmetrical Limiting Meter Switch Gain Reduction Compress Limit Switch Compress Only Output L vel Maximum countcr clockwise position Input Level Maximum clockwise position Recovery Time Position 2 With normal program line level into the CLA 40 input adjust input pad until a gain reduction reading between 3 and 5 VU is noted on the meter Adjust the input level potentiometer for an average gain reduction of approximately 3 VU The exact gain reduction compression setting to be used should be determined by the station engineer 3 The modulation levet of the FM transmitter is adjusted with the output level potentiometer while ob erving the station modulation monitor This adjustment is made with the compress limit switch in the compress limit position This s
5. is the compressed and limited output of the unit and the level is adjustable up to 20 DBM When the desired output level of the CLA 40 is below 4 DBM it is advisable to operate the CLA 40 at ipproxi mately 10 DBM output level and insert a 600 ohm resistive pad in the line to _ obtain the desired level This will provide the same signal to noise catio as is obtained at higher levels 4 Units are shipped connected for 120 volts 50 60 Hz operation 5 Stereo operation of two CLA 40 units is obtained by interconnecting Jl of the units wich a short length of RG 58 cable provided when units ordered for stereo AM OPERATION l Set controls initially as follows Input pad O DB Mode Switch AM Limiter Switch Sym Symmetrical limiting Meter Switch Gain Reduction Compress Limit Switch Compress Only Output Level Maximum counter clockwise position Input Level Maximum clockwise position Recovery Time Position 2 CLA 40A ONLY 2 With normal program line level into the CLA 40 adjust input pad until a gain reduction reading between 7 and 20 VU is noted on the meter Adjust the input level potentiometer for an average gain reduction of approximately 7 0 The exact gain reduction compression setting to be used should be determined by the station engineer 3 The modulation level of the AM transmitter is adjusted with the output levelpotentiometer while observing the station modulation monitor This adjustment is mad
6. 7K ohms 2 7K ohms 180K ohms 180K ohms kw 5 kW 57 kw 57 kW 5 5 kW 57 82 ohms 1 W 57 47K ohms W 57 15 megohm kw 5 15 ohms 820 ohms 5 W 5 Potentiometer 500 ohms 5 Resistor 2 7K ohms 5 5 Resistor 6 8K ohms 5 5 Potentiometer 5K ohm 5 IRC 30 Omit on Var tc Mallory 30 7 pm RE P PARTS LIST continued LIMITER AMPLIFIER MODULE MODEL NO 40 ITEM PART NO DESCRIPTION R21 100 522 Potentiometer 5K ohm IRC 30 R22 100 152 Resistor 15K ohms 5 5 R23 100 184 Resistor 180K ohms 5 5 VVR 451 001 Voltage Variable Resistor 800 016 Board P C 700 024 Module Metal Assembly RIO out LINE AMPLIFIER LA 20 12 pwr gnd 10 Parts List Marti Electronic Inc Anplifier Module Cleburne Texas Model No LA 20 REV 10 76 DESCRIPTION ITEM PART 0 Cl C3 Ql and RI R5 on LA 20P only C4 219 200 Capacitor 22 MF 25 V C5 209 401 Capacitor 470 MF 6 3 V C6 256 301 Capacitor 300 pf Type JL 219 121 Capacitor 150 25V C8 255 270 Capacitor 27 pf NPO 1 KV C9 219 121 Capacitor 150 MF 25 V C10 219 121 Capacitor 150 MF 25 V D1 413 754 Diode Dl 300 A D2 413 754 Diode Dl 300 A Q2 420 549 Transistor BC549B Q3 423 391 Transistor 2 3391 04 450 001 Transistor 5 5 1761 05 450 002 Transistor SPS 1762 R6 105 472 Resistor 4 7K ohms Wat
7. DPTT Transformer Power Transformer Output Transformer Input Terminal Block R2 comp level in vu mtr mod out mtr ibt strap mtr gnd out gnd 2 3 48 6 7 8 9 0 DWG 800 016 1 MARTI Electronics Inc PARTS LIST LIMITER AMPLIFIER MODULE MODEL NO ITEM PART No 219 080 219 080 219 080 219 223 235 254 217 104 226 020 215 333 219 200 219 121 219 121 219 200 414 007 410 914 410 914 410 110 422 925 425 306 450 001 425 255 105 106 100 522 105 222 105 470 105 182 105 682 105 272 105 272 105 184 105 184 115 820 105 473 105 156 105 150 105 821 105 501 105 272 105 682 100 522 DESCRIPTION Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capac itor Capacitor 8 uf 40 V 8 uf 40 V 8 uf 40 V 022 uf 33 V 5 Capacitor 25 uf 200 V 5 01 uf 25 V 80 20 2 2 uf 100 V 107 033 uf 33 V 5 20 uf 16 V 125 uf 16 V 125 uf 15 V 16 V Diode IN4007 Diode IN914 or IN4148 Diode 914 or 104148 Diode SZ11 0A Zener 5 Transistor 2N3391 Transistor 2N5306 Transistor MPS1761 Transistor 2N5245 Resistor 1 megohm 5 5 Potentiometer 5K ohms 5 W IRC 30 Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor 2 2K ohms 5 57 47 ohms 5 5 1 8K ohms 6 8K ohms 2
8. E FREQUENCY RESPONSE FM 50 0 0 DB 50 H2 0 0 DB 100 2 100 400 Hz Un _ 400 Hz 2 l KH2 l KHz 3 KHz 0 0 3 KHz i KHz e 5 a 7 5 KHz 7 5 KH2 7 5 10 KHz mL 10 KHz 0 12 5 KHz t 2 12 5 KHz 2 15 KHz ES 19 KHz DISTORTION COMPRESS ONLY AT 10 DRM 28 1 28 1 NOISE RE 10 DBM DB 2 DB COMPRESSION RATIO ABOVE VU 1 5 og LIMIT LEVEL SET DISTORTION INTRODUCTED AT 7 DB COMPRESSION 400 Hz MATCHED FOR STEREO WITH SERIAL NO Sa aE ET MU ATE TED Oy STOUT OY SEY Oe April 1 1978 CLA 40 COMPRESSOR LIMITER AMPLIFIER INSTALLATION amp OPERATING INSTRUCTIONS 2A A rumen een cir A 1 The model CLA 40H unit requires 35 inches of standard rack space Model CLA 40V unit is 1 6 rack space wide and high and 15 inches deep for use in Marti Type RS 1 rack shelf 2 Install the unit so that it does not receive excessive heat from tube type equipment which may be located in the same rack The ambient operating air temperature should not exceed 40 C 104 F CAUTION DO NOT INSTALL CLA 40A UNITS NEAR POWER TRANSFORMERS OF OTHER EQUIPMENT WHICH CAN INDUCE NOISE INTO THE AUDIO CIRCUITS 3 Connect the 600 ohm program line to terminals 1 and 2 of TB 1 Input audio level should be between 15 DBM to 20 DBM Connect transmitter audio input to terminals 4 and 5 of TB l This
9. NO 383 004 256 471 256 471 226 010 215 682 256 151 215 103 235 254 215 333 219 500 219 500 219 401 219 641 219 641 235 254 215 500 235 750 292 202 297 202 414 007 413 193 413 193 410 914 410 914 412 494 412 494 412 494 412 494 210 009 250 022 330 004 330 004 330 009 030 017 DESCRIPTION 17 MARTI ELECTRONICS Cleburne Texas o Lamp 14 volt No 1813 ox No 756 Capacitor Same Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Same Capacitor Capacitor Same Capacitor Capacitor Capacitor Capacitor Same 470 PF 1 KV 10 1 UF 100 V 10 6800 PF 33V 5 150 PF 1 KV 10 10 000 PF 33V 5 0 25 UF 200V 5 33 000 PF 33V 5 50 UF 40V 400 MF 40 V 640 MF 25V 0 25 UF 200V 5 50 UF 40 V 75 PF 10 002 UF 2KV Diode IN4007 0 75A PRV Diode IN3193 LA 200 Same Diode 4148 Matched with D5 Diode 144148 Matched with Diode 5 579 Matched with D7 8 Diode S 579 Matched with D6 8 Diode 5 579 Matched with D6 7 Diode 5 579 Matched with D6 7 Fuse 3AG 3 4 Amp 120V 3 8 Amp 240V Jack Stereo Strap Inductor Same Inductor 100 uh 10 5 MH 10 Meter Special VU PARTS LIST CLA 40 MAIN FRAME CONTINUED ITEM Pj P2 P3 R19 R20 R21 R22 R23 R24 R25 R26 R27 oW SW2 SW3 SW4 SW5 SW6 T3 1 PART
10. NO 550 059 550 059 550 059 145 561 145 390 145 561 145 431 145 431 145 221 105 821 105 272 105 103 105 682 100 102 105 562 105 472 105 152 100 512 105 272 100 263 115 820 105 561 105 821 105 562 100 501 105 202 105 473 105 335 105 156 105 226 230 018 530 001 530 018 530 001 530 018 530 018 320 019 310 010 310 004 511 021 DESCRIPTION Connector PC 10 Circuit Connector 10 Circuit Connector PC 10 Circuit Resistor 560 ohms 1 4 W 52 Resistor 39 ohms 1 4 W 52 Resistor 560 ohms 1 4 W 52 Resistor 430 ohms 1 4 W 52 Resistor 430 ohms 1 4 54 Resistor 220 ohms 1 4 57 Resistor 820 ohms 1 2 52 W 52 Resistor 2 7 ohms 1 2 Resistor 10 ohms 1 2 52 Resistor 6 8 K ohms 1 2 W 52 Potentiometer K ohms 1 2 W 202 Resistor 5 6 K ohms 1 2 W 54 Resistor 4 7 K ohms 1 2 W 5 Resistor 1 5 K ohms 1 2 W 52 Potentiometer 5 K ohms 1 2 W 202 Resistor 2 7 K ohms 1 2 W 52 Potentiometer 25 K ohms 1 2 W 202 Resistor 82 ohms 1 2 52 Resistor 560 ohms 1 2 W 52 Resistor 820 ohms 1 2 W 52 Resistor 5 6 ohms 1 2 52 Potentiometer 500 ohms 1 2 W 302 Resistor 2 K ohms 1 2 W 52 Resistor 47 ohms 1 2 W 52 Resistor 3 3 Megohms 1 2 W 52 Resistor 15 Megohms 1 2 W 52 Resistor 22 Megohms 1 2 W 52 Switch Switch Switch Switch Switch Switch Input Pad DPTT Mode DPDT Compress Limit DPTT Limit DPDT Meter DPTT Release Time
11. Switch AM Limiter Switch Sy Symmetrical Compress Limit Switch Compress only Input Level Maximum clockwise position 2 Connect 400 Hz signal at 0 DBM level to input terminals Connect a harmonic distortion meter to the output terminals Also load the CLA 40 output with a 600 Ohm resistor Set input level for 7 VU compression Set output level for 10 DBM level 3 Under conditions specified in 2 above measure the CLA 40 distortion at 400 Hz It should be 0 15 to 0 45 total harmonic distortion Place compress limit position and adjust Limit Level potentiometer for 0 9 distortion CLA 40 COMPRESSOR LIMITER AMPLIFIER FM OPERATION continued 4 When operated in the FM MODE the CLA 40 employs a 75 microsecond pre emphasis network before compression limiting and 75 microsecond de emphasis network after compression limiting This provides a very effective control of total transmitter RF bandwidth while maintaining the highest average modulation level However th s FM pre emphasis characteristic must be considered when making frequency response measurements through the CLA 40 unit In the FM MODE the CLA 40 should be preceeded by an AGC amplifier to provide a constant input level Another CLA 40 may be used as the AGC device when set as described under AM OPERATION STEREO OPERATION In the FM MODE two CLA 40 units can be interconnected by a jumper cable of RC 58 coax between Jl of each unit The gain reduction action of ea
12. ch unit causes a corresponding reduction in the other in order to preserve channel separation LIMITING LEVEL A peak limiting circuit is provided in both AM and FM modes of operation The Limit Level Adjust potentiometer is factory adjusted such that no more than 1 per cent harmonic distortion is introduced in the peak limiting process This adjustment can be set to provide a larger or smalier ratio between average and peak modulation A smaller ratio will necessarily produce an increase in dis tortion while a larger ratio will reduce the average modulation level See Limit Level Adjustment in the Ad justment and Test Procedure Section SUMMARY OF CLA 40A SWITCH OPTIONS SWITCH AGC AMPLIFIER FM LIMITER AM LIMITER Compress Limit Compress Only Compress Limit Compress Limit Recovery Time 3 1 2 ASYM SYM SYM ASYM AUDIO PROCESSING SUGGESTIONS USING CLA 40A AM Radio TELCO Pc Studio r Transmitter CLA 40A AM Limiter Asymmetrical Line AM Transmitter AM Radio STL Studio ey Transmitter Audio CLA 40A STL STL CLA 40A AM AGC Transmitter Receiver AM Limiter Transmitter Ant Ant FM Stereo TELCO L Audio CLA 40A AGC Transmitter CLA 40A Line FM Limiter Symmetrical Stereo Generator in Transmitter CLA 40A FM Limiter Symmetrical R Audio CLA 40A Line FM Stereo STL sic
13. dds no audio dis tortion but has a comparatively slow attack time For instantaneou control of short rise time audio waveforms the control voltage is differentiated and applied to the gate of a field effect transistor This device is connected in parallel with the VVR and serves as an extremely fast a enuator operating only on short rise time waveforms thus complimenting the slower VVR device The re sult is a compressor with a 40 db dynamic range and a limiter with microseconds attack time LA 20 12 AMP LIMITEO AUDIO IN AUDIO OUT amp Rs R2 LEVE AMP DET CA 40 MODULE COMP S L TENDS o INPUT R F TB I PAD LEVEL PI LA 20 SW 3 POSITIONS 1 COMPRESS LIMIT 2 2 COMPRESS ONLY 300NI 2 e 3 COMPRESS LIMIT OUT dH s SWw I 6 2 1 INPUT PAD MODE a STEREO SW 1 POS SW 2 POS STRAP 1508 2 5 3008 RELEASE TIME SW6 1 m Me n 2 53 ar LIMIT ee Ld Rs eve LIMITER SW 4 POS 5 1 ASYM 2 SYM METER SWITCH SW 5 POSITIONS 4 GAIN REDUCTION 2 1 OUT c 3 4VU OUT a hoe COMPRESSOR DWG 700 098 MARTI Electronics dua CLA 40 PART LIST MAIN FRAME CLA 40A ITEM 1 2 C3 C4 C5 C6 C7 20 C9 C10 Cll C12 C13 C14 C15 C16 C17 C18 Dl D2 D3 D4 D5 D7 D8 D9 Fl Ll L2 L3 1 PART
14. e with the compress limit switch in the compress limit position This switch should always be in this position when program audio is modulating the transmitter CLA 40 COMPRESSOR LIMITER AMPLIFIER AM OPERATION continued 4 Symmetrical peak limiting will be obtained in step 3 above because of the initial settings called for in step 1 If asymmetrical peak limiting higher positive peaks than negative peaks is desired the limiter switch be set to Asym position is now necessary to determine the correct polarity phasing between the compressor limiter and transmitter audio input terminals Proceed as follows Feed 400 Hz tone into the CLA 40 input terminals at a level to produce VU gain reduction on the meter and approximately 1007 modulation of the transmitter Place the limiter switch in Asym position Select positive peak monitoring on the station modulation monitor Note the modulation percentage Reverse the audio output line at terminals 4 and 5 of TB 1 and again observe the modulation percentage Select negative peak monitoring at the station modulation monitor and adjust output level the CLA 40 for the desired negative modulation percentage between 90 and 1007 The conditions established above hould produce a positive to negative peak modulation ratio of approximately 1 25 to 1 This is dependent upon the capability of the cransmitter in providing required peak power 5 Phasing of the audio
15. me Marti further guarantees that any radio transmitter described herein will deliver specified radio frequency power output at the antenna lead when connected to a suitable load but such guarantee shall not be con strued as a guarantee of any definite coverage or range of said apparatus The guarantee of these paro graphs is void if equipment is altered or repaired by others than Marti or its authorized service Repre sentative or unless specifically authorized in writing by Marti No other warranties expressed ar implied shall be applicable to any equipment sold hereunder and the foregoing shall constitute the Buyer s sole right and remedy under the agreements contained in this paragraph In no event shall Marti have any liability for consequential damages or for loss damage or expense directly or indirectly arising from the use of the products or any inability to use them either separately or in combination with other equipment or materials or from any other cause CHU UP Ups 3r U AES GNE GCSE S Sr BE Gar GS SVL MN CY YN 30 CY CRT COSY 7 CRY SEY CLA 40A SPECIFICATIONS Application Peak Limiting Input and Output Impedances Input Level Maximum Output Level Frequency Response Maximum Noise Distortion
16. put terminals With CA 40 module removed from the unit set Output Level for 0 VU on tne meter 10 VU Re install CA 40 module and tighten hold down screws Adjust R17 for 6 VU on the meter 3 Remove the 400 Hz signal from input terminals and place Meter Switch in Gain Reduction position Adjust Meter Cal potentiometer R2I for a 0 VU reading on the meter 4 Apply a 400 Hz signal to the input terminals at a 15 DBM level With Meter Switch in Gain Reduction position Compress Limit Switch in compress only position adjust at the thresho of gain reduction as indicated by a slight movement in the negative direction from 0 VU meter pointer position o Increase the 400 Hz input signal level until 5 VU Gain Reduction is indicated on the meter Slowly rotate R20 in a clockwise direction until an increase in meter reading positive movement of approximately VU is obtained Repeat procedure if necessary When properly set the meter should read 4 3 4 VU under the above test condition This concludes CA 40 adjustment Replace cover and screws THEORY OF OPERATION OF THE MARTI CA 40 SOLID STATE COMPRESSOR LIMITER MODULE The Marti CA 40 compressor limiter unit operates on the variable audio attenuator principle A full wave audio detector provides voltage proportional to audio peak level which controls a voltage variable resistor VVR average level attenuator This VVR de vice has a very large dynamic operating range a
17. t 5 R7 R8 105 221 Resistor 220 ohms 5 watt 5 R9 105 102 Resistor ohms 5 watt 5 R10 R11 105 472 Resistor 4 7 ohms 5 watt 5 R12 105 472 Resistor 4 7 ohms 5 watt 5 R13 105 103 Resistor LOK ohm 5 watt 5 R14 105 221 Resistor 220 ohms 5 watt 5 R15 105 184 Resistor 180 K ohms 5 watt 5 R16 105 184 Resistor 180 K ohms 5 watt 5 R17 Resistor 22 47 ohms watt 5 Factory Selected 599099 Board Circuit LA 20 700 024 Module Metal Assembly LA 20 Module 450 001 450 002 483 391 413 754 40 Module 451 001 423 391 425 306 450 001 424 255 CLA 40 Main Frame Spares 219 641 219 401 413 193 115 820 310 004 310 010 320 019 030 017 510 074 510 009 No M om rm m Un ho rm rm rm MN MPS 1761 Transistor MPS 1762 Transistor 2N3391A Transistor IN3754 or INA007 Diode Voltage Variable Resistor 2N3391A 2N5306 5 1761 245245 Capacitor 68ouF 25V Capacitor 4000 40 Diodes IN3193 or IN 4007 Resistor 82 ohm 1W Transformer Audio Input Transformer Audio Output Transformer Power 320 019 Meter 15 VU Lamp 14 Volt No 756 Fuse 3AG 3 4 Amp
18. witch should always be in this position when program audio is modulating the transmitter The meter switch can be placed in the 10 or 4 VU position to monitor the actual audio level into the transmitter VA p n aa M ee COMPRESSOR LIMITER AMPLIFIER ADJUSTMENT AND TEST PROCEDURE continued FM RESPONSE ADJUSTMENT 1 Set CLA 40 controls as follows Input Pad ODB Mode Switch AM Limiter Switch Sy Symmectrical limiting Meter Switch 10 VU Compress Limit Switch Compress Limit Out Input Level Maximum clockwise position Output Level Set to 0 VU indication on meter with an input signal of 400 Hz at O DBM level 2 Connect an aud o voltmeter having a sensitivity greater than 20 DBM to the output terminals of the CLA 40 unit Also load the output with a 600 ohm resistor Reduce the input level 15 DB by setting Input Pad Switch to center position Re cord output level on the audio voltmeter with the 400 Hz signal applied as in Step 1 above Set input signal at 15 KHz at same level Output voltmeter should read the same as with the 400 Hz signal 0 5 DB position and adiust R22 for the same reading as was noted in mode Switch again to FM to check that the two levels are the same R22 is attached to pins 1 2 and 3 of the output LA 40 amplifier socket P3 Ge CEE es ee Ee ee ue 1 Position CLA 40 controls as follows Input Pad ODB Mode

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