Electro-Voice 602FTR Data Sheet

leit Ybre=: ENGINEERING
DESCRIPTION AND APPLICATIONS
The Model 602FTR is a hand-held dynamic microphone
designed for highly articulate speech transmission under
high ambient noise. The 602FTR is the result of
continuous study of the needs of the communications
industry, and it uniquely meets the specialized require-
ments of airline, two-way radio, and industrial applica-
tions. The 602FTR is a transistorized pressure-gradient
microphone utilizing three sound entrances for reduction
of interfering ambient noise. Stated simply, if sound
pressure and phase are reasonably identical at both sound
entrances, as in the case of relatively distant sounds, then
little or no output results. If, however, sound originates
in close proximity to one sound entrance (ie. % to 4
inch) a pressure and phase differential exists and output
results. The 602FTR is unexcelled at discriminating
between near and distant sounds for maximum ambient
noise rejection. The compact two-stage transistor ampli-
fier is specially stablized and will operate uniformly from
+165° down to —40°. Output of the transistor amplifier
is designed to plug directly into inputs designed for
carbon microphones. À screwdriver accessible potenti-
ometer is provided for adjustment of output level. The
602FTR provides extremely reliable, crisp, clear speech
reproduction with high sensitivity and low distortion.
SPECIFICATIONS
Type: Transistorized Dynamic
Frequency Response: 100 to 5,000 Hz
Impedance: Matches 100 and 500 ohm carbon input
Polar Pattern: Pressure gradient
(Differential close-talking)
Output Level: —43 db at % inch from front of
microphone at maximum potentiometer setting.
(0 db = 1 velt/dyne/cm?)
High impact Cycolac
Black Leather grain
Case Material:
Finish:
GOZFTR NOISE-CANCELLING
TRANSISTORIZED DYNAMIG
Transistor Amplifier
Power Gain: 35 db (6 volts)
Current Drain: 25 ma (20 volts)
Rated Supply Voltage: 6 to 30 volts
Maximum Undistorted Output: 0.7 volt
Controls: Output level (adjustable through screwdriver
accessible potentiometer)
Dimensions: 214” wide, 4” high, 114” deep
Net Weight: 0.7 lbs.
Cable: 4-conductor, coiled cord, 5’ extended
Switch: Wiping contact leaf switch
opens microphone circuit in OFF position,
also provided with contacts for relay operation
Accessories Supplied:
Temperature Range:
FAA Approval:
Panel mounting bracket
—40° F to 165° F
TSO C58, Category B
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INSTALLATION
Figure 2 shows a typical power supply circuit for carbon
and carbon equivalent microphones. The specific values
for Ry and Rg must be determined by referring to the
equipment schematic. In some circuits the value of Rg is
Zero.
Use the graph in Figure 3 to determine proper series
resistance and/or supply operating voltage for 602FTR.
For finding range of total R (R, + Rg) acceptable, locate
equipment operating voltage on graph. Then refer to
“usable operating region” directly above voltage refer-
ence point. For example, 24V power supply indicates
that a total series resistance of from 200 to 8,000 ohms is
acceptable.
Microphone output level may be adjusted by means of a
screwdriver accessible potentiomenter at the rear of the
602FTR.
TOTALA EATURATION REGION
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MIC. VOLTAGE —_
Figure 2 - Typical
Power Supply
OPERATING
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SUPPLY VOLTAGE
Figure 3 - Acceptable
Operating Region
OVERHAUL INSTRUCTIONS
1. Special Tools. None.
2. Disassembly. (See Figure 4)
a. Begin disassembly by removing the three screws
holding the case back,
b. Do not remove the head subassembly unless it is
necessary to replace the head. If it is necessary to
replace this component, proceed as indicated in
Steps c and d,
c. Remove two screws from switch plate holding head
assembly in place. Gently remove the head.
d. With the head assembly removed, it is possible to
unsolder all leads and replace the head.
e. The switch assembly should not be removed from
switch plate.
f. Do not unsolder leads to switch unless necessary for
replacement of cable.
3. Cleaning:
a. Thoroughly clean all dust and dirt from microphone
by first using dry, compressed air to dislodge dirt
from inaccessible corners. Then clean each part with
a lint-free cloth or brush.
b. Remove pits from switch contacts by burnishing.
4, Inspection:
a. Inspect switch contacts for signs of excessive wear.
b. Examine unit for damaged or dried-out wiring or
sleeving. Check all solder connections for good
contacts.
c. Check cable for signs of damage such as cuts or
cracks.
5. Repair or Replacement;
a. Replace any part which is damaged.
b. Check resistance across the head with an ohmmeter.
It should read about 150 ohms, In addition, a
distinct click from the microphone element should
be heard when the circuit to the ohmmeter is made
or interrupted. If it is not, replace head as described
in the reassembly procedure.
6. Reassembly:
a. Reassembly is the reverse of disassembly.
7. Test Procedure: (See Figure 7)
8. Check of Switch Operation:
a. With switch released, check the resistance between
the white and green leads. (Tip and sleeve on PJOGB
plug). It should be infinite.
b. Check resistance between the red and black leads. It
should be infinite.
c. Depress switch and check resistance between white
and green leads. (Tip and sleeve on PJOB8 plug.) It
should be zero.
d. Depress switch and check resistance between red
and black leads. It should be from 1000 to 10,0
ohms depending on meter polarity. :
9. Check of Microphone Output:
The best procedure for testing the microphone is to
compare its output with one known to be operating
properly, using the test set-up shown in Figure 7.
Check the output voltage as follows:
a. Depress microphone switch and adjust test voltage
to obtain 6 to 8 volts on DC meter.
b. Hold the test microphone about %-inch from the
mouth and talk at normal speech level with micro-
phone switch depressed. An output of about 0.10
volt should be obtained.
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Figure 4 - Assembly
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Figure 6 - 602FTR Wiring Diagram
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Figure 5 - Transistor Amplifier Figure 7 - Test Set-up
Fig. E-V No.
No. Part No. Description Req'd.
1 76137 Case front 1
2 76141 Head adapter 1
3 76278 Grille cloth 1
4 3863 Washer 1
5 R8009 Head subassembly 1
6 10031 Magnet 1
7 2817 Rubber bumper 1
8 A74942 Bracket 1
9 62438 Screw ( #4 x %"' self-tap,phillips) 2
10 74341 Spacer 1
11 62534 Screw [+6 x 7/8” self-tap,phillips)| 1
12 B60328 Screw (# 4-40 x %" phillips) 2
13 56063 Leaf switch 1
14 2756 solder lug 1
15 74943 Actuator 1
16 20632 Eyelet 1
17 19006 Actuator spring 1
18 84946 Back case subassembly 1
19 62437 Screw (4 4-24 x 1"self-tap,phillips)] 1
20 62489 Screw (# 4 x %''self-tap,phillips) 2
21 74707 Flex relief 1
22 83546 Cable subassembly 1
23 85715 Amplifier subassembly 1
24 27208 Zierick lug, 263 1
25 74939 Strain relief 1
26 5536-95 Aluminum foil, #" x 12" lg. 1
27 1608-10 Black wire, 3" lg. 2
28 77901 Magnetic shield 1
29 A48405 FAA nameplate 1
30 1610-15 Red wire 2" lg. 1
31 28039-81 Tesamol 1
32 75920 Dash mounting bracket 1
a Gulton coven ELECTRO-VOICE, Inc. 600 CECIL ST., BUCHANAN, MICH, 49107
Part No. 534550
REPLACEMENT PARTS FOR 602FTR
/ MICROPHONE MANUFACTURING AND REPAIR — SEVIERVILLE TENN. 37862
212
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