Installation and Operation Manual
Model 210
Voice Activated Switch
SM210
Rev. 2.02
Northern Airborne Technology Ltd.
1925 Kirschner Road
Kelowna, BC, Canada.
V1Y 4N7
Telephone (250) 763-2232
Facsimile (250) 762-3374
Issued on the authority of Northern Airborne Technology Ltd.
Copyright 1988
SM210
DOCUMENT NO. 210-16
CHANGE RECORD
DATE
CHANGE
APPROVAL
10-11-88
ORIGINAL DOCUMENT RELEASED
DH JJ
3-2-93
Revision A:
AP
Incorporation of Mod A: Added Mod A Information to pages
1,2,4,5 and 7. Added detail part number description page b.
TYPE II, Eff. S/N 1859 and all returns.
Mar 26, 2007
Revision 2.00:
Rewritten to be closer to NAT standards. Includes NAT
address on front cover, and a drawing list to include
previous and current versions.
Jan 22, 2008
Mar 19, 2008
Revision 2.01
Add latest drawing Revs to manual.
Revision 2.02
Add latest Acceptance Test Procedure (Page 6 on).
Installation note 2 (ON) corrected.
Page a
SM210
DOCUMENT NO. 210-16
MODEL 210 DETAIL PART NUMBER PROCEDURES AND LEVELS
The Detail Part Numbers associated with the Model 210 Voice Activated Switch may define level
adjustment and/or test procedure differences than those outlined in Section 6.0 of this document.
The following tabulation describes those differences.
Note: A Model 210 with an associated Detail Part Number is designated as a Model
210-XXX, where XXX is the applicable Detail Part Number.
Detail Part No.
001
Description of ATP Section 6.0 Differences
Voice Activate Threshold Level is 200mVRMS.
Throughout this document: Reference to Model 210-001 in place of
Model 210.
ATP Section 6.0: Step 7.0, Set activate LEVEL to 200mVRMS.
NAMEPLATE: Stamp -001 next to model "210" on cover nameplate.
QAR: Use Model 210-001 QAR in place of Model 210 QAR.
Page b
SM210
DOCUMENT NO. 210-16
INSTALLATION NOTES:
1. PURPOSE:
Reduce noise from a HOT microphone when the operator is not talking. Activates on voice
(preset level) from an amplified dynamic microphone.
2. SPECIFICATION:
ON: Responds to voice (above preset level) within 1.5 milliseconds after operator starts talking.
OFF: Attenuates microphone noise by 30 dB (minimum) within 2 seconds after operator stops
talking.
3. CONNECTION DIAGRAM:
See Outline Drawing 210 on page 2a
4. OPERATING TEMPERATURE:
-55 to +70 degrees C.
5. SQUELCH LEVEL:
Adjustable from 15 to 350mVRMS using screwdriver adjustment through cover.
6. ENCLOSURE:
Aluminum alloy, finished with chromate conversion film per MIL-C-5541 for corrosion
resistance and electrical bonding.
7. MOUNTING:
The Model 210 may be mounted in any position.
8. DRAWINGS:
The attached drawings are listed below. The original manual drawings had no title block, and
the revision is shown as Rev -.
Page Drawing
Rev
Description
Type
S/N (MOD)
2
210
-
Voice Activated Switch
Outline
MOD A
2a
210
B
Voice Activated Switch
Outline
2052 and up
3
210-1
-
Voice Activated Switch
Assembly
MOD A
3a
210-1
1.30 Voice Activated Switch
Assembly
2052 and up
4
210-41
4a
210-41
5
210-3
-
Voice Activated Switch
Schematic
MOD A
5a
210-3
C
Voice Activated Switch
Schematic
2052 and up
6
210-4
1.40 Voice Activated Switch
Acceptance Test Procedure
-
Voice Activated Switch
PCB Assembly
MOD A
1.41 Voice Activated Switch
PCB Assembly
2052 and up
All
Page 1
Page 2a
Page 3a
Amendment # 1
Page 4a
DOCUMENT NUMBER 210-4
REVISION 1.40
ACCEPTANCE TEST
PROCEDURE
VOICE ACTIVATED SWITCH
MODEL NUMBER
210-(XXX)
PREPARED BY
Doug Halvorson
DATE
8-23-82
APPROVED BY
Robert Billingsley
DATE
8-26-82
Amendment 2
Page 6
DOCUMENT NO. 210-4 REV 1.40
CHANGE RECORD
DATE
CHANGE
11-27-84
Revision A:
7.0 HEADSET CHECK: activate level was 50 mVRMS.
Revision B:
Incorporation of MOD A.
Page 2, Step 6.3 was 150mVRMS, Step 6.7 and 6.8 were
250mVRMS.
3-1-93
APPROVAL
DH
AP
Added detail part number 001 information Page b (210-001) Added
210-001 QAR.
TYPE II, Eff. S/N 1859 and all returns.
Jan 29, 2007
Feb 1, 2008
Revision 1.30: DOCCR01919
Modified procedure to use a Model 415 and T415 instead of a
Model 204.
Revision 1.40: DOCCR02407
Step 6.3: >325 mVrms was 350 ±25 mVrms.
Step 6.4: <35 mVrms was 15 ±20 mVrms.
MLN
(approved DAS)
Page a
DOCUMENT NO. 210-4 REV 1.40
MODEL 210 DETAIL PART NUMBER PROCEDURES AND LEVELS
The detail part numbers associated with the Model 210 Voice Activated Switch may define level
adjustments and/or test procedures different from those outlined in Section 6.0 of this document.
Table A describes those differences.
Note: A Model 210 with an associated detail part number is designated as a Model 210-XXX,
where XXX is the applicable detail part number.
Table A. Detail Part Numbers
Detail Part No.
Description
001
Voice Activate Switch Level is 200 mVrms.
Throughout this document: Reference to Model 210-001 in place of
Model 210.
Page 2, Step 7.0, Set activate level to 200 mVrms.
QAR: QAR for Model 210-001 to be used in place of Model 210 QAR.
Page b
DOCUMENT NUMBER 210-4
ACCEPTANCE TEST PROCEDURE
MODEL 210-(XXX)
VOICE ACTIVATED SWITCH
1.0
SCOPE
This test procedure provides functional verification tests that check all operational features and all audio
input and output channels of the Model 210 Voice Activated Switch. It is required that each Model 210
meet the requirements of this test procedure prior to shipment.
2.0
REFERENCE DOCUMENTS
2.1
2.2
Outline Drawing
Schematic Drawings
3.0
TEST EQUIPMENT
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
Audio Amplifier, DB 415 or equivalent headset amplifier.
T415 or equivalent
Headset, Telex E-951 or equivalent
Signal Generator, ATSI or equivalent
ACVM, HP400H or equivalent
VOM, Simpson 260 or equivalent
Oscilloscope, Tektronics 465B or equivalent
Distortion Analyzer, HP330 or equivalent
Frequency Counter, HP5381A or equivalent
Power Supply, 28VDC, 1 ampere
4.0
EQUIPMENT CONNECTION
No. 210
No. 210-3
Page 1
DOCUMENT NUMBER 210-4
5.0
BIAS VOLTAGE
Disconnect the generator and connect the VOM between pins 1(+) and 2(-). The voltage shall be
10 – 14 VDC. Disconnect the VOM and reconnect the generator as shown above.
6.0
PERFORMANCE TEST
6.1
Adjust the 210 LEVEL adjust fully clockwise.
6.2
Set the generator frequency to 1000 Hz, minimum amplitude. Set the generator load to
un-wtd 600 Ω
6.3
HIGH LEVEL ACTIVATE. Gradually increase the generator amplitude until the 210 output
appears, the generator level shall be >325 mVrms. Return the generator amplitude to minimum.
6.4
LOW LEVEL ACTIVATE. Adjust 210 LEVEL fully counterclockwise. Gradually increase the
generator amplitude until the output appears, the generator level shall be <35 mVrms.
6.5
GAIN. Increase the generator level to 75 mVrms. The 210 output shall be 75 ±20 mVrms.
6.6
SWITCH ATTENUATION. Adjust the 210 LEVEL fully clockwise. Maintain the generator level at
75 mVrms, the 210 output shall be less than 2.4 mVrms.
6.7
HARMONIC DISTORTION. Increase the generator level to 400 mVrms. Measure the harmonic
distortion, it shall be less than 2.5%.
6.8
FREQUENCY RESPONSE. Maintain the generator level at 400 mVrms and vary the generator
frequency from 300 – 3000 Hz. The output of the 210 shall not vary more than ±1 dB across the
frequency range.
7.0
HEADSET CHECK
Set the generator output level at 100 mVrms and adjust the 210 LEVEL until output from the 210 is
observed. All units shall be shipped with the activate LEVEL set at 100 mVrms.
Disconnect the generator and connect the microphone to the 210 input. Listen to the headphones while
counting slowly (2 seconds minimum between counts) from one to ten, all words shall be complete and
clear.
8.0
PHYSICAL CHARACTERISTICS
Inspect the Model 210 in accordance with the outline drawing requirements. Mark the 210 cover
indicating test and physical acceptance after the unit has met all requirements of this document.
Page 2
QUALITY ASSURANCE REPORT
Serial
Model
Test
Accept
210-001
Procedure No.
Rev.
210-4
Remarks:
1.40
Test Date
Tested By
Sheet
1 of 1
5.0
BIAS VOLTAGE
6.3
HIGH LEVEL ACTIVATE
6.4
LOW LEVEL ACTIVATE
6.5
GAIN
6.6
SWITCH ATTENUATION
6.7
HARMONIC DISTORTION
6.8
FREQUENCY RESPONSE
7.0
HEADSET OPERATION
8.0
PHYSICAL CHARACTERISTICS
MOUNTING DIMENSIONS
NAMEPLATE LEGIBILITY
SERIAL NUMBER
DATE STAMP
WEIGHT
Threshold set at 200 mV
QUALITY ASSURANCE REPORT
Model
Serial
Test
Accept
210
Procedure No.
Rev.
210-4
Remarks:
1.40
Test Date
Tested By
Sheet
1 of 1
5.0
BIAS VOLTAGE
6.3
HIGH LEVEL ACTIVATE
6.4
LOW LEVEL ACTIVATE
6.5
GAIN
6.6
SWITCH ATTENUATION
6.7
HARMONIC DISTORTION
6.8
FREQUENCY RESPONSE
7.0
HEADSET OPERATION
8.0
PHYSICAL CHARACTERISTICS
MOUNTING DIMENSIONS
NAMEPLATE LEGIBILITY
SERIAL NUMBER
DATE STAMP
WEIGHT
Threshold set at 100 mV
Page 5a