ST JUSTTALK User manual

SECURE-TECH
DETENTION ELECTRONIC SYSTEMS
ETECH CONTROLS CORPORATION - MANUFACTURER
4051 ALVIS COURT #3, ROCKLIN, CALIFORNIA, USA 95677
TEL [phone] • FAX [phone] • FREE [phone]
FEATURES:
FULL DUPLEX COMMUNICATION
HANDS FREE OPERATION
STYLISH APPEARANCE
MUTE AND PRIVACY OPTION
MONITOR AND RECORD
TAMPER RESISTANT DESIGN
2 YEAR WARRANTY
FUNCTIONAL DESCRIPTION:
The "JUSTTALK" Duplex Talk Through Communicator is
designed for staff or attorney/client interview rooms, visitation
booths, control room to corridor, and other applications
requiring communication through a security glass partition
or wall. Full duplex two-way communication is provided. The
talk through communicator frequency range is 400 to 4000 Hz
± 3 db. . Each pair of units is tuned to the installed location
environment to maximize sound levels. The result is very
natural hands free communication.
JUSTTALK The base system consists of a pair of
identical units, typically one on each side of a viewing window
or wall. Usually used for visitation. Order model JUSTTALK.
JUSTTALK-M Two switches allow an attorney or staff to
silence (off) the voice output from the inmate side; or to mute
(off) the staff/attorney's side output for privacy. Provided
with audio lineout function to allow monitoring and recording.
Order model JUSTTALK-M.
JUSTTALK-V2 Two volume controls allow an attorney or
staff to adjust the inmate and staff talk volume from an inmate
conversation level to a monitor minimum and a staff/attorney
conversation level to mute (off) unit for privacy. Provided
with audio lineout function to allow monitoring and recording.
Order model JUSTTALK-V2.
SIZE:
2.52" H x 4.44" D x 17.0" L
64.0mm H x 112.8mm D x 431.8mm L
POWER:
12 - 14 VDC, 600ma maxI
.35 INCH (NOMINAL) CAST ALUMINUM, SEMI-GLOSS
BLACK
(JUSTTALK-V2 SHOWN)
INSTALLATION:
The recommended mounting location is on a 4" high hollow
metal window frame sill, centered between sidewall parti-
tions, with the speakers and microphones side pointing down
towards the countertop reective surface.
An alternate mounting location is upon the countertop, cen-
tered between sidewall partitions, with the speakers and
microphones side facing towards the viewing window.
SECTION 2 - 7 3/11
MODEL
JUSTTALK
DUPLEX TALK THROUGH COMMUNICATOR
WRITING SURFACE
4.0000
RECOMMENDED LOCATION
1/4-20UNC THROUGH
7 GA STEEL SCREW BLOCKS
POWER - TYPICAL
JUSTTTALK-V2 SHOWN
2.75
12VDC POWER
PATH
ALTERNATE LOCATION

SECTION 2 - 7
MODEL
JUSTTALK
DUPLEX TALK THROUGHT COMMUNICATION
TYPICAL INSTALLATION
3/11
WRITING SURFACE
4.0000
RECOMMENDED LOCATION
1/4-20UNC THROUGH 7 GA STEEL SCREW BLOCKS
POWER - TYPICAL
JUSTTTALK-V2 SHOWN 2.75
12VDC POWER
PATH
ALTERNATE LOCATION

MODEL: JUSTTALK
DUPLEX TALK THROUGH COMMUNICATOR
INSTALLATION DETAILS / HOOK-UP DIAGRAM
SPEAKER
SPEAKER
MIC
- +
- +
MIC
SPEAKER
- +
SPEAKER + -
MIC
P1
P2
P7
P6
U3
R12 R13 R19 R20
+MIC- -MIC+ LIN LOUT GND +12V +SPK- -SPK+
NULL VOL
P3
P4
P5
MUTE GND
HC-0825 REV. A DIFFERENTIAL AMPLIFIER
FLO FHI
P1
P2
P7
P6
U3
R12 R13 R19 R20
+MIC- -MIC+ LIN LOUT GND +12V +SPK- -SPK+
NULL VOL
P3
P4
P5
MUTE GND
HC-0825 REV. A DIFFERENTIAL AMPLIFIER
FLO FHI
MIC
+ TO 12VDC POWER SUPPLY
- NOTE (-) SHOULD BE COMMON TO EARTH
STAFF TALK AMP
STAFF LISTEN AMP
FIELD
TERMENATIONS
#22 OR LARGER
NOTCH
1
NOTCH
2
VOL
MIC
BALANCE
NOTCH
3
NOTCH
4
VOL MIC
BALANCE
CLIENT
STAFF
INSTALL
IN
CONDUIT
OUTLET
BOX
INSTALL
IN
CONDUIT
OUTLET
BOX
2
1
3
4
5
6
2
1
3
4
5
6
2
1
ADJUSTING JUSTTALK UNITS – CLOSE DOORS AND WINDOWS -
Units are shipped with factory operating settings and should require only minor adjustments. If feedback does occur, go to steps #1 and #5, use
small increment steps of tuning volume and notch lters.
The adjustments require a small “at blade” screwdriver –
Remove 8 set screws for access to internal adjustment pots – the right side 4 adjustments are for client side station.
Note: tapping housing near mike with a nger will aid in adjusting by providing a reference level. If adjustment steps #3 and #5 does not clear
the feedback, the following is the full re-calibration procedure.
Be consistent - be patient.
Set external volume knobs - fully clockwise (max volume setting) upper knob is client listen
Set internal volume pots - mid-way
Set notch lter pots -mid-way
Initially retain factory internal mike pot settings (see step #2)
Power up (ring LED illuminates)
If feedback occurs -
1. Reduce volume – adjust volume pots clockwise until feedback is eliminated – alternate between the two ampliers so both are
approximately at the same volume level –
a. Adjust to highest volume -
2. Adjust mike pot balance on each unit – alternate between the two ampliers so both are approximately at the same volume level –
a. Adjust to highest volume –
Alternate adjustments between steps #3 and #4 -
3. Increase volume – adjust internal volume pots counterclockwise until feedback re-occurs. Try to keep both ampliers at same volume
level. When feedback is just starting, go the step #4.
4. Adjust notch lter pots until the feedback frequency is muted – begin with notch pot #4 to match the lowest frequency (where possible).
Continue with step #5.
5. Repeat steps #3 and #4 for each feedback frequency
There are four notch lters (two on each amplier) – each one will mute a different feedback frequency.
Making small adjustments between testing will be to your benet –
Units are calibrated for maximum volume. Adjust external volume knobs for desired operating volume.
Replace 8 set screws –