WisyCom CST38 User manual

CST38 User Manual
VHF MICROEAR
"DESKTOP" TRANSMITTER
SN: ________________
Rev. 02
Date: 16 May 2017

Rev. 02
CST38 User Manual


CST38 User Manual
Rev. 02
2
BRIEF DESCRIPTION
CTK38 is composed by a VHF transmitter (CST38) and a power supply (PSP910).
The CST
-  and many modulation parameters such as deviation, level/frequency
curve, compression factor has been optimized. Therefore CST38 assures maximum
performances of MicroEar both as sound quality and as audio level (in any case limited
because of the very small size of receiver).
Higher power transmitter are available to further increase the coverage area (cell); it is also
possible to link in parallel several transmitters (in iso-frequency mode) to create a multiple
cells coverage.
MicroEar internal battery has about 30 hours working autonomy; in any case the original
battery once activated (taking out metal label) has a limited life even in power off.
When empty battery, MicroEar will drastically reduce audio level and receiver sensitivity.
Example of VHF IEM System
*Not included
AGN00*
MICROEAR
RECEIVER*
CST38
PSP910

Rev. 02
CST38 User Manual

SAFETY INSTRUCTION
Read this safety instruction and the manual first
Follow all instructions and information.
Do not lose this manual.
Do not use this apparatus under the rain or near the water.
Do not install the apparatus near heaters or in hot environments, do not use outside
the operating temperature range.
Do not open the apparatus, only qualified service technician are enabled to operate on
it. The apparatus needs servicing when it is not properly working or is damaged by
liquids, moisture or other objects are fallen in the apparatus.
Use only accessories or replacement parts authorized or specified by the manufacturer.
Clean the apparatus only with dry cloths, do not use liquids.
Report the serial number and the purchasing date in front of the manual. It is needed to
have proper replacement parts or accessories from the manufacturer.
When replacement parts are needed, use only replacement parts authorized from the
manufacturer. Substitution with not authorized parts could result in electric shock,
hazards or fire.
Keep attention on all the labels with warnings or hazards on the apparatus.
The apparatus is intended for professional use; anyway the manufacturer alerts
the user that the headphone output power of the apparatus could exceed the level of 85
dB(A) of sound pressure level and this could be dangerous for the hearings. Do not use the
headphone with high power level or for long time. Reduce the power or suspend the hearing
in case of any kind of hearing problem.

CST38 User Manual
Rev. 02
4
FRONT PANEL
1) SELECTOR: modulation audio input level range (Micro / Line).
2) LED INDICATION: peak-indicator / limiter-on status (yellow Led).
3) ADJUSTMENT: audio input sensitivity.
With the optimum sensitivity adjustment, the yellow Led [2] must flash under
modulation peaks.
4) SELECTOR: transmitting channel ( 0 ÷ F ).
5) LED INDICATION: apparatus is on (red Led).
6) SWITCH: On / Off (Power).

Rev. 02
CST38 User Manual

REAR PANEL
7) CONNECTOR: antenna (N-F type connector).
8) CONNECTOR: modulation audio input (XLR3-F type connector).
The audio input line is transformer balanced and floating.
pin 1 = ground; pin 2 = AF-a input; pin 3 = AF-b input.
9) - 6.3 mm, standard jack
type).
The transmission is allowed when the central pin (hot) is connected to external ring
(ground).
Note #1: in the standard version of CST 38, when the PTT plug is not inserted, the carrier
is still activated.
Instead, when the CST 38 is provided with the optional VOX 38 Voice Activated Circuit
board, the carrier is activated automatically only when the input audio-signal reaches the
activation-threshold pre-set in the VOX 38 board. However, the external PTT circuit (if
connected) can override the VOX 38 device and force the CST 38 in continuous
transmission.
10) CONNECTOR: dc power input (10.5 ÷ 16 Vdc).
(pin 1 = +Vdc, pin 2 = ground).

CST38 User Manual
Rev. 02
6
OPTIONAL
VOX 38 - Voice Activated Circuit board
This device is useful to switch on automatically the carrier of the transmitter only when the
circuit is mounted on a printed-circuit
board, that has to be factory-mounted in the transmitter.
Once the modulation audio signal reaches the pre-set threshold, the transmitter is
activated.
When the modulating audio signal is not more present, the carrier is switched off again,
after a pre-set delay time. Consequently the relevant MicroEar receiver is muted by its
built-in squelch circuit, preventing the listening of unwanted noise.
Two pre-setting values can be adjiusted by means of relevant screwdriver-trimmers
situated on the printed-
VOX 38 board, mounted
on the CST 38 main board

Rev. 02
CST38 User Manual

TECHNICAL SPECIFICATIONS
Switchable channels : 16, preset in the 140 ÷ 250 MHz range (other upon request).
Switching-window : 10 MHz (other upon request).
Frequencies : microprocessor controlled PLL synthesizer circuit, with 25 kHz
minimum step [1].
         
Programming 
Channel spacing : 25KHz standard (Other on request)
Frequency error : < ±5 ppm, in the rated temperature range.
Temperature range : -10 ÷ +55 °C.
RF output power : 300 ÷ 10 mW (1 dB) [1].
RF output impedance : 50 ohm (type N-F connector).
Spurious emissions : < 2 nW.
Transmission activation : remote PTT (Push To Talk) circuit, wired to 
jack connector.
The transmission is allowed when the central pin (hot) is
connected to external ring (ground). See Note #1 on front
page.
Modulation : FM (peak deviation = ±5 kHz).
Mod. audio input : transformer balanced, floating.
Mod. audio input level : Micro / Line switchable, and externally adjustable between:
Micro = -64 ÷ -34 dBu (0.5 ÷ 15 mV)
-Input impedance = > 2 Kohm
Line = -22 ÷ +8 dBu (60 ÷ 1,950 mV)
-Input impedance = > 10 kohm.
Peak-limiter : automatic, with dynamic-range > 30 dB over the level set for
the nominal modulation.
NR system : compressor circuit with noise-gate, specially adapted to the
MicroEar receivers.
AF bandwidth : 200 Hz ÷ 5 kHz (-3 dB).
Distortion : < 0.5 % (0.25% typ.).
SND/N ratio : > 80 dB (83 dB typ.), CCITT measured.
Led indications : Transmitter On (red LED)
Limiter On (yellow LED).
Powering : 10.5 ÷ 16 Vdc, 300 mA max. (negative ground).
Dimensions : 40 x 120 x 175 mm.
Weight : 700 g ca.
NOTE [1]: according to local regulations

CST38 User Manual
Rev. 02
8
MANUFACTURER DECLARATIONS
In compliance with the following requirements
RoHS Directive (2002/95/EC)
WEEE Directive (2002/96/EC)
Please dispose of the diversity transmitter at the end of its operational
lifetime by taking it to your local collection point or recycling center for
such equipment
ITALY ONLY
Obblighi di informazione agli utilizzatori

pericolose nelle apparecchiature

Smaltimento di apparecchiature elettriche ed elettroniche di tipo professionale

indica che il prodotto alla fine della propria vita utile deve essere raccolto
separatamente dagli altri rifiuti.
La raccolta differenziata della presente apparecchiatura giunta a fine vita è organizzata

dovrà quindi contattare il produttore e seguire il sistema che questo ha adottato per
iatura giunta a fine vita.

trattamento e allo smaltimento ambientale compatibile contribuisce ad evitare possibili effetti negativi
sulla salute e favorisce il reimpiego e/o riciclo dei materiali di cui è composta

-
ministrative previste dalla normativa vigente.
Iscrizione al Registro A.E.E. n. IT09100000006319
.

Rev. 02
CST38 User Manual

Compliance
Model
In Compliance with
Max Power&
Freq. range
Country
CST38
EN 301 489-1/-9
EN 600065
EN 300 422-1/-2
EN 300 454-1/-2
300mW*1
140-250MHz
Europe
CST38-US
PART 74
FCC-ID: POUCST38
RSS-210
IC: 11967A-CST38
Limited to 210-216MHz
50mW EIRP
210-216MHz
USA, Canada
*1CST38 is not an SRD device, thus it requires specific authorization by your local frequency authority!
Statements regarding FCC and Industry Canada
EN
This device complies with Industry Canada RSS-210. Operation is subject to the following two conditions:
(1) this device may not cause interference, and (2) this device must accept any interference, including
interference that may cause undesired operation of the device.
The antenna(s) must be installed and operated at a minimum distance of 20cm between the radiator
and your body.
This radio transmitter IC: 11967A-CST38 has been approved by Industry Canada to operate with the
antenna types listed below with the maximum permissible gain indicated. Antenna types not included in
this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for
use with this device.
FR
Le présent apparcables aux appareils radio RSS-210.
              
llage radioélectrique subi, même si le


votre corps
LIC: 11967A-CST38 a été approve par Industrie Canada pour travailler avec les tipologies
dantennes ci dessous avec le gain maximal admissible indiqué. Les types d'antenne non inclus dans
cette liste, ayant un gain supérieur au gain maximal indiqué pour ce type, sont strictement interdits pour
être utilisés avec cet appareil.
Before putting the device into operation, please observe the
respective country-specific regulations!

CST38 User Manual
Rev. 02
10
This device complies with Part 15 of the FCC Rules and with RSS-210 of Industry Canada.
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may cause
undesired operation.
This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against
harmful interference in a residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no guarantee that interference will not occur
in a particular installation. If this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and on, the user is encouraged to try
to correct the interference by one or more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
Consult the dealer or an experienced radio/TV technician for help.
Changes or modifications made to this equipment not expressly approved by Wisycom srl may void the
FCC authorization to operate this equipment.
Antenna Code
Description
Max permissible
gain [dBi]
AWN38-V11
1/4whip antenna
2,14
AGN00-V9
1/4mobile whip antenna
2,14

Rev. 02
CST38 User Manual

Wireless System Communications
Via Spin 156 I-Italy
Tel. [phone] Fax +39 - 0424 - 382733
www.wisycom.com e-mail: [email protected]