BiQuad Link Thesla 950 TX User manual

USER MANUAL
VOLUME 1
thesla 95o TX & RX &
Produced per Biquad
powered by R.V.R. Electronics
Link

LINK THESLA 950 TX & THESLA 950 RX - User manual version 1.0
BIQUAD TECNOLOGIA LTDA.
Rua Marcos Flávio e Dias, 260 - Jardim Beira Rio,
Telephone: [phone]
Email: [email protected]
Web: www.biquadbroadcast.com
All rights reserved
Printed and bound in Brazil. No part of this manual may be reproduced,
memorized or transmitted in any form or by any means, electronic
or mechanic, including photocopying, recording or by any informa-
tion storage and retrieval system, without written permission of the
copyright owner.
File Name: USER_MANUAL_THESLA_950_TX_RX_ING_1.0.cdr
Version: 1.0
Date: 10/07/2019
Revision History
Date Version Reason Editor
10/07/2019 1.0 First Version Carlos André
Notification of intended purpose and limitations of product use
This product is a FM transmitter intended for FM audio broadcasting. It utili-
ses operating frequencies not harmonised in the intended countries of use.
The user must obtain a license before using the product in intended country
of use. Ensure respective country licensing requirements are complied with.
Limitations of use can apply in respect of operating frequency, transmitter
power and/or channel spacing.
Declaration of Conformity
Hereby, Biquad Tecnologia Ltda, declares that this FM transmitter is in com
pliance with the essential requirements and other relevant provisions of
Directive 2014/53/EU.
Santa Rita do Sapucaí / MG - Brazil CEP: 37540-000

User Manual
Table of Contents
Preliminary Instructions
W arranty
Fi rst Aid
Treatment of electrical shock
Treatment of electrical Burns
General description
Unpacking
Features
THESLA 950 TX Frontal Panel Description
THESLA 950 TX Rear Panel Description
THESLA 950 TX Connector Description
THESLA 950 RX Frontal Panel Description
THESLA 950 RX Rear Panel Description
THESLA 950 RX Connector Description
4.9 Technical Description 12
THESLA 950 TX quick guide for installation and use
Preparation 13
5.2 Operation 14
5.3 Setting and Calibration
5.4 Software
6. THESLA 950 RX quick guide for installation and use
6 . 1 Preparation 20
6.2 Operation 21
Setting and Calibration
6.4 Software 22
7. Functioning principles of the THESLA 95 TX
7.1 Power supply 27
7.2 Reducing card 27
7.3 Panel card 28
7.4 Monitoring card 28
7.5 Main card 28
7.6 Power Amplifier 29
7.7 Telemetry card 29
8. Functioning principles of the THESLA 95 RX
8.1 Power supply 32
Power supply interface
8.3 Panel card 33
8.4 IF card 33
8.5 Front End 34
8.6 VCO/PLL 34
8.7 Telemetry card 34
THESLA 95o TX & RX &
Rev. 1.0 - 10/07/19
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2
328.2
216.3
20
14
15
5.1
5. 13
11
10
9
8
7
6
3
3
3
2
2
1
2.
3.
4.5
4.4
4.3
4.2
4.1
4.
3.2
3.1
1.
4.6
4.7
4.8
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31
I

User Manual
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THESLA 95o TX & RX &
Rev. 1.0 - 10/07/19
II

1. Preliminary Instructions
• General Warnings
This equipment should only be operated, installed and
maintained by “trained” or “qualified” personnel who are familiar
with risks involved in working on electric and electronic circuits.
“Trained” means personnel who have technical knowledge of
equipment operation and who are responsible for their own
safety and that of other unqualified personnel placed under
their supervision when working on the equipment.
“Qualified” means personnel who are trained in and
experienced with equipment operation and who are
responsible for their own safety and that of other unqualified
personnel placed under their supervision when working on
the equipment.
WARNING: Residual voltage may be present inside
the equipment even when the ON/OFF switch is set to
Off. Before servicing the equipment, disconnect the
power cord or switch off the main power panel and
make sure the safety earth connection is connected.
Some service situations may require inspecting the
equipment with live circuits. Only trained and qualified
personnel may work on the equipment live and shall be
assisted by a trained person who shall keep ready to
disconnect power supply at need.
R.V.R. Elettronica shall not be liable for injury to persons or
damage to property resulting from improper use or operation
by trained/untrained and qualified/unqualified persons.
WARNING: The equipment is not water resistant.
Any water entering the enclosure might impair proper
operation. To prevent the risk of electrical shock or
fire, do not expose this equipment to rain, dripping or
moisture.
Please observe local codes and fire prevention rules when
installing and operating this equipment.
WARNING: This equipment contains exposed
live parts involving an electrical shock hazard. Always
disconnect power supply before removing any covers
or other parts of the equipment.
Ventilation slits and holes are provided to ensure reliable
operation and prevent overheating; do not obstruct or
cover these slits. Do not obstruct the ventilation slits under
any circumstances. The product must not be incorporated
in a rack unless adequate ventilation is provided or the
manufacturer’s instructions are followed closely.
WAR NIN G: T his equ ip men t ca n ra di a te
radiofrequency energy and, if not installed in compliance
with manual instructions and applicable regulations,
may cause interference with radio communications.
WARNING: This equipment is fitted with earth
connections both in the power cord and for the chassis.
Make sure both are properly connected.
Operation of this equipment in a residential area may cause
radio interference, in which case the user may be required
to take adequate measures.
The specifications and data contained herein are provided
for information only and are subject to changes without
prior notice. Biquad Tecnologia Ltda disclaims all warranties,
express or implied.While Biquad Tecnologia Ltda attempts to
provide accurate information, it cannot accept responsibility
or liability for any errors or inaccuracies in this manual,
including the products and the software described herein.
Biquad Tecnologia Ltda reserves the right to make changes to
equipment design and/or specifications and to this manual
at any time without prior notice.
• Notice concerning product intended purpose and use
limitations.
This product is a radio transmitter suitable for frequency-
modulation audio radio broadcasting. Its operating
frequencies are not harmonised in designated user countries.
B e f o r e o p e r a t i n g t h i s e q u i p m e n t , u s er mu s t
obtain a licence to use radio spectrum from the
competent authority in the designated user country.
Operating frequency, transmitter power and other
characteristics of the transmission system are subject to
restrictions as specified in the licence.
2. Warranty
Biquad Tecnologia Ltda warrants this product to be free from
defects in workmanship and its proper operation subject to
the limitations set forth in the supplied Terms and Conditions.
Please read the Terms and Conditions carefully, as purchase
of the product or acceptance of the order acknowledgement
imply acceptance of the Ter ms and Cond itio ns.
For the latest updated terms and conditions, please visit our web
site at www.biquadbroadcast.com. The web site may be modified, removed
or updated for any reason whatsoever without prior notice.
The warranty will become null and void in the event the
product enclosure is opened, the product is physically
damaged, is repaired by unauthorised persons or is used for
purposes other than its intended use, as well as in the event
of improper use, unauthorised changes or neglect.
In the event a defect is found, follow this procedure:
1 Contact the seller or distributor who sold the equipment;
provide a description of the problem or malfunction for
the event a quick fix is available.
Sellers and Distributors can provide the necessary
information to troubleshoot the most frequently encountered
problems. Normally, Sellers and Distributors can offer a
faster repair service than the Manufacturer would. Please
note that Sellers can pinpoint problems due to wrong
installation.
2 If your Seller cannot help you, contact Biquad
Tecnologia Ltda and describe the problem; if our staff deems
it appropriate, you will receive an authorisation to return
the equipment along with suitable instructions;
3 When you have received the authorisation, you may
return the unit. Pack the unit carefully before shipment;
use the original packaging whenever possible and seal
the package perfectly. The customer bears all risks of
loss (i.e., Biquad shall not be liable for loss or damage)
until the package reaches the Biquad factory. For this
reason, we recommend insuring the goods for their full
value. Returns must be sent on a C.I.F. basis (PREPAID)
to the address stated on the authorisation as specified
by the Biquad. Service Manager.
Units returned without a return authorisation may
be rejected and sent back to the sender.
The symbol of lightning inside a triangle placed on the product, evidences the operations for
which is necessary gave it full attention to avoid risk of electric shocks.
The symbol of exclamation mark inside a triangle placed on the product, informs the user
about the presence of instructions inside the manual that accompanies the equipment, im-
portant for the efficacy and the maintenance (repairs).
THESLA 95o TX & RX &
User Manual
Rev. 1.0 - 10/07/19
IMPORTANT
1 / 41

4 Be sure to include a detailed report mentioning all
problems you have found and copy of your original
invoice (to show when the warranty period began) with
the shipment.
Please send spare and warranty replacement parts orders to
the address provided below. Make sure to specify equipment
model and serial number, as well as part description and
quantity.
3. First Aid
All personnel engaged in equipment installation, operation
and maintenance must be familiar with first aid procedures
and routines.
3.1 Electric shock treatment
3.1.1 If the victim is unconscious
Follow the first aid procedures outlined below.
• Lay the victim down on his/her back on a firm
surface.
• the neck and tilt the head backwards to free
the airway system (Figure 1).
Figure 1
• If needed, open the victim’s mouth and check
for breathing.
• If there is no breathing, start artificial respiration
without delay (Figure 2) as follows: tilt the head
backwards, pinch the nostrils, seal your mouth
around the victim’s mouth and give four fast
rescue breaths.
Figure 2
• Check for heartbeat (Figure 3); if there is
no heartbeat, begin chest compressions
immediately (Figure 4) placing your hands in
the centre of the victim’s chest (Figure 5).
Figure 3 Figure 4 Figure 5
• One rescuer: give 2 quick rescue breaths after
each 15 compressions.
• Two rescuers: one rescue breath after each 5
compressions.
• Do not stop chest compressions while giving
artificial breathing.
• Call for medical help as soon as possible.
3.1.2 If the victim is conscious
• Cover victim with a blanket.
• Try to reassure the victim.
• Loosen the victim’s clothing and have him/her
lie down.
• Call for medical help as soon as possible.
3.2 Treatment of electric burns
3.2.1 Large burns and broken skin
• Cover affected area with a clean cloth or
linen.
• Do not break any blisters that have formed;
remove any clothing or fabric that is stuck to
the skin; apply adequate ointment.
• Administer adequate treatment for the type of
accident.
• Get the victim to a hospital as quickly as
possible.
• Elevate arms and legs if injured.
If medical help is not available within an hour, the victim is
conscious and is not retching, administer a solution of table
salt and baking soda (one teaspoon of table salt to half
teaspoon of baking soda every 250 ml of water).
Have the victim slowly drink half a glass of solution for four
times during a period of 15 minutes.
Stop at the first sign of retching.
Do not administer alcoholic beverages.
3.2.2 Minor burns
• Apply cold (not ice cold) strips of gauze or dress
wound with clean cloth.
• Do not break any blisters that have formed;
remove any clothing or fabric that is stuck to
the skin; apply adequate ointment.
• If needed, have the victim change into clean,
dry clothing.
• Administer adequate treatment for the type of
accident.
• Get the victim to a hospital as quickly as
possible.
• Elevate arms and legs if injured.
THESLA 95o TX & RX &
User Manual
Rev. 1.0 - 10/07/19
BIQUAD TECNOLOGIA LTDA.
Rua Marcos Flávio e Dias, 260 - Jardim Beira Rio,
Telephone: [phone]
Santa Rita do Sapucaí / MG - Brazil CEP: 37540-000
2 / 41

4. General Description
The THESLA 950 TX and THESLA 950 RX, are respectively, a broadband radio transmitter
and receiver for the transport of audio signals as an auxiliary to the frequency
modulation sound broadcasting.
This type of equipment is often called STL (Studio-to-Transmitter Link).
The THESLA 950 TX is designed to work in an optimum way when connected to the
receiver THESLA 950 RX.
Externally, it is a box to mount in a 19” rack, each one being 2HE high.
4.1 Unpacking
The package contains:
1 THESLA 950 TX and/or THESLA 950 RX;
1 User Manual;
1 Mains power cable;
The following accessories are also available from Your Biquad Dealer:
• Accessories, spare parts and cables
4.2 Features
The standard working frequency bands are the following:
THESLA 95o TX & RX &
User Manual
Rev. 1.0 - 10/07/19
3 / 41
THESLA 950 TX 937.5 - 940 MHZ / 946 - 952 MHZ.
THESLA 950 RX 937.5 - 940 MHZ / 946 - 952 MHZ.

Note: the working frequency (and therefore the band) should be indicated when
the order for such product is placed.
Warning: upon request, these links are available at other frequency bands and
steps, please contactact RVR in order to check the availability of modules at the
required frequency.
The is available with internal stereo coder which can guarantee an
optimum stereophonic separation as well as a low level of harmonic distorsion. In
function of your own requirements it can be configurated for the functioning under
the Mono/MPX mode (that is to say when excluding the stereo coder and when
using the “left” inputs as a “mono” input or the BNC, which is always on, as “MPX”).
The configuration can be done by the user with the help of software. It has also
two inputs (SCA1 and SCA2) for signals which are modulated on sub-carriers by
appropriated external coders, normally used in Europe for the RDS transmission
(Radio Data System).
In the standard version of the , the demodulated signal is available in the
MPX form (that is to say the complete basis signal band) and in the mono version.
Moreover there are two connectors used for the respective SCA outputs. As an
option, the can be equipped with a stereo decoder option. Also when
this option is present, apart from the outputs for the LEFT and RIGHT channels,
the outputs for the MPX signal are present and for the possible sub-carriers.
The important audio characteristics of this equipment are the low distorsion and
intermodulation values and the high S/N level; another important quality both of the
THESLA 950 TX and the THESLA 950 RX is its very simple construction and its easy use.
Both the THESLA 950 TX and the THESLA 950 RX were designed in a modular way: the
different functions are executed by modules connected directly with male and
female connectors or with flat cables with connectors at both ends. This type of
design makes the maintenance and the possible replacement of modules an easy
operation.
THESLA 95o TX & RX &
User Manual
Rev. 1.0 - 10/07/19
THESLA 950 TX
THESLA 950 RX
THESLA 950 RX
4 / 41

The microprocessor system includes an LCD display and an encoder that enable
the interaction with the user, and implements the following functions for the
transmitter:
• Setting of the output power
• Setting of the working frequency
• Activation and switch off of the power distribution
• Measurement and display of the working parameters of the transmitter
• Communication with external devices
These functions are implemented for the receiver:
• Display of the modulation
• Setting of the working frequency
• Setting of the muting
• Measurement and display of the working parameters of the receiver
• Communication with external devices
The system of the management software is composed of several menus.
The user can navigate between the different submenus by using four push-buttons:
ESC, LEFT/HIGH, RIGHT/LOW, and ENTER.
The status of the unit is indicated by four LEDs which are present on the front
panel:
• ON, LOCK, FOLDBACK, RF MUTE for the
• ON, LOCK, PILOT, MUTE for the
Both the transmitter and the receiver have an input for the external 24 Vcc supply.
This auxiliary supply source, that can be realized by the user with the help of rescue
batteries, is automatically used in case of AC voltage absence.
THESLA 95o TX & RX &
User Manual
Rev. 1.0 - 10/07/19
THESLA 950 TX
THESLA 950 RX
5 / 41

4.3 THESLA 950 TX Frontal Panel Description
[1] AIR FLOW Grid for the air flow.
[2] ON Green LED, lit when the transmitter is feeded.
[3] LOCK If it is on, indicates that the PLL is locked at the reference
frequency.
[4] FOLDBACK Yellow LED, lit when the foldback function is operating
(automatic reduction of the delivered RF power).
[5] R.F. MUTE If it is flashing, it indicates that the exciter is not erogating
power because it is inhibitted by an external interlock.
[6] ESC Push-button to press to exit from a menu.
[7] LEFT/DOWN Push-button for the navigation in the system composed of
several menus and for the modification of the parameters.
[8] RIGHT/DOWN Push-button for the navigation in the system composed of
several menus and for the modification of the parameters.
[9] ENTER Push-button for the confirmation of a parameter and to enter
the menus.
[10] DISPLAY Liquid crystal display.
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User Manual
Rev. 1.0 - 10/07/19
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6 7 8 9 10
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4.4 THESLA 950 TX Rear Panel Description
[1] PLUG & FUSE BLOCK VDE plug for AC voltage and fuse-holder. Contains the
protection fuse for the 3,15 A.power supply.
[2] FAN Blower for the forced cooling.
[3] R.F. OUTPUT RF Output conne. ctor N type, 50
[4] PHASE ADJ Trimmer for the regulation of the pilot tone phase.
[5] PILOT LVL Trimmer for the fine regulation of the pilot level.
[6] MODE/MPX IMP Dip-switch for the selection both of the transmission mode
(STEREO or MONO) and the impedance of the MPX input
MPX, selectable at 50Ω or 10kΩ.
[7] SCA 1/RDS BNC connector of the unbalanced SCA 1/RDS input..
[8] MPX BNC connector of the unbalanced MPX input.
[9] MPX ADJ Trimmer for the regulation of the levels of the MPX input..
[10] SCA 1/RDS ADJ Trimmer for the regulation of the SCA 1/RDS input levels.
[11] RIGHT ADJ Trimmer for the regulation of the levels of the Right input.
[12] RIGHT XLR connector for the input of the Right audio channel.
[13] SERVICE/RDS DB9 connector for the programmation made by the factory.
[15] R.F. TEST POINT Maximum 20dBm output at the output power level.
[16] CARRIER FREQ. ADJ Trimmer for the fine regulation of the carrier frequency.
[17] PRE ENPHASIS Dip-switch for the setting of the pre enphasis 50 or 75
The preenphasis has an influence on the right and left inputs
in stereo and on the mono input. The MPX inputs are not
influenced by the setting of the preenphasis.
[18] 19KHZ PILOT OUT BNC output connector for the pilot tone, which can be used
for the synchronisation of the external devices such as RDS
coder, etc...
[19] SCA 2 BNC connector for the SCA2 input.
[20] SCA2 ADJ Trimmer for the regulation of the SCA2 input levels.
[21] LEFT/MONO ADJ Trimmer for the regulation of the LEFT/MONO input levels.
[22] LEFT/MONO XLR connector for the LEFT/MONO audio channel input.
[23] IMPEDANCE Dip-switch for the selection of the impedance of the balanced
audio inputs, selectable at 600Ω or 10kΩ.
[24] INTERLOCK IN BNC interlock connector: When the main conductor is
grounded, the transmitter is forced to go in stand-by mode.
[25] RFL EXT. AGC Trimmer for the control of the erogated power in function of
the RFL Fold input.
[26] FWD EXT. AGC Trimmer for the control of the erogated power in function of
the FWD Fold input.
THESLA 95o TX & RX &
User Manual
Rev. 1.0 - 10/07/19
Ω
[14] POWER ON/OFF switch. It switches off the exciter without
disconnecting the AC supply.
1 2 3 4 567 8 9 10 11 12 13
15 16 17 18 19 20 21 22 23 24 25 26 2714
[27] REMOTE DB15 connector for the telemetry of the device.
7 / 41

4.5 THESLA 950 TX Connector Description
4.5.1 Remote
Type: DB15 female
Pin N a m e T y p e Meaning
1 Interlock IN Pull-up 5V (if GND then RF
MUTE)
2 FWD Foldback IN Ext. signal,1÷12V, for power
limitation (AGC)
3 G N D GND
4 SDA IIC IN/OUT IIC communication serial data
5 VPA Tlm O U T 3,9V P.F.S.
6 FWD tlm O U T 3,9V P.F.S.
7 Status Good OUT Open or closed relay
collector, internally
selectable.
8 G N D GND
9 G N D GND
10 RFL Foldback IN Ext. signal, 1÷12V, for power
limitation (AGC)
11 SCL IIC IN IIC communication clock
12 IPA Tlm O U T 3,9V P.F.S.
13 RFL Tlm O U T 3,9V P.F.S..
14 On cmd IN Pull-up 5V(one grounded
pulse of 500ms en ables
power supply
15 OFF cmd IN Pull-up 5V(one grounded
pulse of 500ms dis ables
power supply
4.5.2 Left (MONO) & Right
Type: XLR male
1 GND
2 Positive
3 Negative
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User Manual
Rev. 1.0 - 10/07/19
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4.6 THESLA 950 RX Frontal Panel Description
[1] AIR FLOW Grid for the air flow.
[2] ON Green LED,lit when the transmitter is feeded
[3] LOCK If it is on, indicates that the VCO is locked at the reference
frequency.
[4] PILOT Yellow LED, if it is flashing, it indicates that there is a
disfunction in the demodulated signal.
[5] MUTE Yellow LED, if it is flashing, it indicates that the muting is
activated, which means that the input signal has decreased
under the defined threshold.
[6] ESC Push-button to press to exit from a menu.
[7] LEFT/UP Push-button for the navigation in the system composed of
several menus and for the modification of the parameters.
[8] RIGHT/DOWN Push-button for the navigation in the system composed of
several menus and for the modification of the parameters.
[9] ENTER Push-button for the confirmation of a parameter and to enter
the menus.
[10] DISPLAY Liquid crystal display.
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Rev. 1.0 - 10/07/19
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6 7 8 9 10
9 / 41

4.7 THESLA 950 RX Rear Panel Description
[1] MAINS VOLTAGE Plug for the AC voltage, 85-264V 50-60Hz.
[3] RF input connector N t y p e , 5 0 Ω
[4] MUTE BNC interlock connector for the muting of the audio outputs
with an external command.
[5] SCA/MPX OUT BNC connector for the unbalanced SCA or MPX output.
[6] SCA OUT BNC connector, for the unbalanced SCA OUT output.
[7] SCA OUT ADJ Trimmer for the regulation of the SCA OUT output.
[8] RIGHT/MONO ADJ Trimmer for the regulation of the RIGHT/MONO output levels.
[9] MONO/RIGHT XLR connector for the audio channel Mono or Right output.
[10] 24VDC IN Connectors for the external 24V power supply. Positive (red)
and negative (black).
[11] REMOTE DB15 connector for the telemetry of the device.
[12] SERVICE DB9 connector for the programmation made by the factory.
[13] 10.7 MHz IF OUT BNC output connector for the 10.7 MHz sampling for tests.
[14] MPX OUT BNC output connector for the unbalanced MPX.
[15] MPX OUT ADJ Trimmer for the regulation of the MPX OUT input levels.
[16] SCA/MPX OUT ADJ Trimmer for the regulation of the SCA/MPX input levels.
[17] MONO/LEFT ADJ Trimmer for the regulation of the MONO/LEFT input levels.
[18] MONO/LEFT XLR connectors for the MONO or LEFT audio channel input.
[19] DE ENPHASIS Dip-switch for the setting of the presence of de enphasis. The
de enphasis has an influence on the right and left outputs in
stereo mode and on the mono input. The MPX outputs are not
influenced by the setting of the pre enphasis.
THESLA 95o TX & RX &
User Manual
Rev. 1.0 - 10/07/19
[2] POWER ON/OFF switch. It switches off the exciter without
disconnecting the AC supply.
1 2 3 456 7 8 9
10 11 12 13 14 15 16 17 18 19
R.F. INPUT 50Ω
10 / 41

4.8 THESLA 950 RX Connector Description
4.8.1 Remote
Type: DB15 Female
Pin N a m e T y p e Meaning
1 Audio OFF IN Pull-up 5V(if grounded, it
inhibits the Audio)
2 N.C.
3 G N D GND
4 SDA IIC IN/OUT IIC communication serial data
5 RF Input Level OUT 4V P.F.S. (R.S.S.I.)
6 LEFT Output Level OUT 2V F.S .
7 Muting TLS OUT Open or closed relay
collector selectable, co ntact
to GND
8 G N D GND
9 G N D GND
10 N.C.
11 SCL IIC IN IIC communication clock
12 MPX Output Level OUT 2V F.S.
13 RIGHT Output LevelOUT 2V F.S.
14 N.C.
15 N.C.
4.8.2 Left (MONO) & Right
Type: XLR male
1 GND
2 Positive
3 Negative
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4.9 Technical Description
THESLA 950 TX
Parameters U.M. Value Value Notes
Frequency range work bandwith is 20 MHz
Rated output power W 10 Continuously variable by software from 0 to maximum
*: 10W only in 937.5 - 940MHZ / 946 - 952MHZ.
Sensitivity RF @ 25dB S/N Mono dBm -100
Modulation type Direct carrier frequency
Intermediate Frequency MHz 70 , 10,7 , 0,35
Operational Mode
Ambient working temperature °C Whithout condensing
Frequency programmability
Frequency stability WT from -10°C to 50°C ppm
Modulation capability kHz 130
Pre-emphasis mode μS 0 , 50 , 75
De-emphasis mode μS 0 , 50 , 75
Spurious & harmonic suppression dBc <70
Asynchronous AM S/N ratio Referred to 100% AM,
with no de-emphasis dB ≥ 60
Synchronous AM S/N ratio
Referred to 100% AM,
FM deviation 7,5 kHz by 400Hz sine,
without de-emphasis
dB ≥ 50
RMS @ ± 75 kHz peak,
HPF 20Hz - LPF 23 kHz,
50 μS de-emphasis
dB > 75 > 75
Qpk @ ± 75 kHz peak,
CCIR weighted,
50 μS de-emphasis
dB > 68
Qpk @ ± 40 kHz peak,
CCIR weighted,
50 μS de-emphasis
dB > 63
Frequency Response 30Hz ÷ 15kHz dB better than ± 0.3 dB ± 0,3
Total Harmonic Distortion THD+N 30Hz ÷ 15kHz % < 0.04 < 0,1
Intermodulation distortion
Measured with a 1 KHz,
1.3 KHz tones,
1:1ratio, @ 75 kHz FM
% < 0 . 0 2
Transient intermodulation distortion
3.18 kHz square wave,
15 kHz sine wave
@75 kHz FM
% < 0.1 (typical 0.05)
Composite S/N FM Ratio
RMS @ ± 75 kHz peak,
HPF 20Hz - no LPF,
50 μS de-emphasis
dB > 75 > 68
30Hz ÷ 53kHz dB ± 0.2 ± 0,2
53kHz ÷ 100kHz dB ± 0.3 ± 0,6
THD+N 30Hz ÷ 53kHz % < 0.1
THD+N 53kHz ÷ 100kHz % < 0.15
THD+N 1kHz % < 0,2
Intermodulation distortion
Measured with a 1 KHz,
1.3 KHz tones,
1:1ratio, @ 75 kHz FM
%
Transient intermodulation distortion
3.18 kHz square wave,
15 kHz sine wave
@75 kHz FM
%
Stereo separation 30Hz ÷ 53kHz dB > 50 >45
RMS @ ± 75 kHz peak,
HPF 20Hz - LPF 23 kHz,
50 μS de-emphasis,
L & R demodulated
dB 80 ÷ 260 (*)
Qpk @ ± 75 kHz peak,
CCIR weighted,
50 μS de-emphasis,
L & R demodulated
dB 25
Qpk @ ± 40 kHz peak,
CCIR weighted,
50 μS de-emphasis,
L & R demodulated
dB 20
Frequency Response 30Hz ÷ 15kHz dB 0,8
Total Harmonic Distortion THD+N 30Hz ÷ 15kHz % VDE IEC Standard
Intermodulation distortion
Measured with a 1 KHz,
1.3 KHz tones,
1:1ratio, @ 75 kHz FM
%
Transient intermodulation distortion
3.18 kHz square wave,
15 kHz sine wave
@75 kHz FM
Stereo separation dB
Main / Sub Ratio 30Hz ÷ 15kHz dB 483 (19")
Frequency response 40kHz ÷ 100kHz dB ± 0.5 394
RMS, ref @ ± 75 kHz peak,
no HPF/LPF,
0μS de-emphasis,
with 67 kHz tone on SCA input
@ 7,5kHz FM deviation
dB > 75 372
RMS, ref @ ± 75 kHz peak,
no HPF/LPF,
0μS de-emphasis,
with 92 kHz tone on SCA input
@ 7,5kHz FM deviation
dB > 78 about 5
AC Supply Voltage VAC (*) Full range (**) Internal switch
AC Apparent Power Consumption VA 120 25
Active Power Consumption W 70 10
Power Factor 0,5 0,8
Connector
DC Supply Voltage VDC
DC Current ADC 5 < 2 A
Front panel width mm
Front panel height mm
Overall depth mm
Chassis depth mm
Weight kg about 7 about 5
Cooling Forced, with internal fan Convection cooling
Acoustic Noise dBA < 58 /
Connector XLR F XLR F
Type Balanced Balanced
Impedance Ohm 10 k or 600 100 Ohm
Input Level /Adjust dBu -13 to +13 -10 to +14
Connector XLR F XLR F
Type Balanced Balanced
Impedance Ohm 10 k or 600 100 Ohm
Input Level dBu -13 to +13 -10 to +14
Connector BNC 2 x BNC
Type unbalanced Unbalanced
Impedance Ohm 10 k or 50 100
Input Level / Adjust dBu *-13 to +13 -20 to +13
Connector 2 x BNC 2 x BNC
Type unbalanced Unbalanced
Impedance Ohm 10 k 100
Input Level / Adjust dBu *-8 to +13 -20 to +7
Connector N type
Impedance Ohm 50
Connector N type
Impedance Ohm 50
Connector BNC
Impedance Ohm 50
Output Level dB approx. -30
Connector
Impedance Ohm
Output Level Vpp
Interlock Connector BNC
Remote Interface Connector DB15F
Service Connector
Telemetry Connector DB15F
FUSES
On Mains
Input device
Display
Analogical level FWD fold
Analogical level REF fold
pulse RF ON
pulse RF OFF
ON/OFF level Interlock
Analogical level FWD
Analogical level REF
Analogical level VPA
Analogical level IPA
ON / OFF level Power Good
4 pushbutton
Alphanumerical LCD - 2 x 16
1 External fuse F 3,15 T - 5x20 mm
DB9 F
RF Input
Remote connector inputs
Remote connector outputs
±1
VDE IEC Standard
80 ÷ 260 (*)
24
88 (2HE)
Pilot output
AUXILIARY CONNECTIONS
HUMAN INTERFACES
TELEMETRY / TELECONTROL
Right
MPX
SCA/RDS
OUTPUTS / INPUTS
RF Output
RF Monitor
DC Power Input
MECHANICAL DIMENSIONS
Phisical Dimensions
VARIOUS
AUDIO INPUTS / OUTPUTS
Left / Mono
483 (19")
394
372
STEREO OPERATION
Stereo S/N FM Ratio
SCA OPERATION
Crosstalk to main or to stereo channel
POWER REQUIREMENTS
AC Power Input
GENERALS
MONO OPERATION
S/N FM Ratio
MPX OPERATION
Frequency Response
Total Harmonic Distortion
937,5 ÷ 942, 946 ÷ 952
Mono, MPX
-10 to + 50
From software, with 5 kHz steps
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< 0.05
< 0.1
< 2 A
24
%
MHz

5. THESLA 950 TX quick guide for installation and use
This chapter contains the necessary instructions for the installation and use of the
equipment. In case some aspects are not totally clear, for instance when a user
is using this equipment for the first time, we advise the new user to read carefully
the entire description contained in this manual.
5.1 P reparation
Unpack the exciter and before doing any other operation, be sure it has not been
damaged during transport. In particular check that all the connectors are in perfect
condition.
The main fuse can be accessed from the outside on the rear panel. Extract the
fuse carrier with a screwdriver to check its integrity or for replacement, if necessary.
The fuse to be used is this type:
• MAIN FUSE 3.15 A ; 5mmx20mm
Check that the supply voltage value coincides with the AC voltage available.
The input supply field is of:
• THESLA 950 TX 80-260 VAC
Check that the
THESLA 950 TX
mains switche is in the “OFF” position, it is placed on
the rear panel and inhibits the switching power supply of the machine.
Connect the RF output of the exciter to the antenna cable or to a dummy load able
to dissipate the power generated by the THESLA 950TX.
Note: in case the load is not present, don’t touch the RF output connector during
the equipment operation to avoid electric shock and electrocution.
Connect the mains cable to the proper standard IEC plug, placed on the rear
panel.
Note: It is necessary that the mains system being provided with grounding to
ensure both the operators’ safety and correct operation of the equipment.
If the user intends to use external batteries in case of AC supply interruption,
connect them to the clamps situated at the back of the equipment being careful
to respect the polarity.
WARNING: Keep in mind that the general switch of the transmitter has an effect
on the AC supply, and not on the possible auxiliary supply. If you use an external
supply with continuous current, it is then necessary to have an external switch for
this purpose.
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Connect the audio cable and RDS/SCA of the signal source to the proper input
connectors of the THESLA 950 TX.
5.2 Operation
Switch on the transmitter by putting the selector on the position “I” (on) the switch
situated on the panel, and switch it on thanks to the switch situated on the rear
panel.
Enter the menu “Set” and set the working frequency desired.
With the help of the switches and trimmers situated on the rear panel, set the
characteristics (impedance, preenphasis, and possibly stereo/mono) and the levels
of the audio inputs and RDS (if used).
Note: When it comes out of the factory, the output power of the unit is regulated
at the minimum and is setted on the OFF position. Anyway we always advise to
check the setted level before you select the output power, especially when the
unit is used as modulator of a power amplifier.
From the predefined menu, set the desired power level.
From the menu “Fnc”, set the power output.
5.3 Setting and Calibration
The only regulations that should be done manually on the THESLA 950 TX are the
regulations of the levels and audio functioning modes.
On the rear panel of the unit there is a trimmer for each input of the exciter;
the silkscrenn of the panel indicated to which input each trimmer refers to. The
sensitivity of the different inputs can be regulated with the trimmers as indicated
in the following tables:
Sensitivity of the inputs:
Input Chap. 7.2 Trimmer Sensitivity Notes
MPX/RDS [10] [11] -20 ÷ +13 dBm Input level for 2.0 kHz (-30 dB) of
deviation
SCA1 [9] [24] - 8 ÷ +13 dBm Input level for 7.5 kHz (-20 dB) of
deviation
SCA2 [22] [23] - 8 ÷ +13 dBm
Left -
Mono/MPX
[26] [25] -13 ÷ +13 dBm Input level for75 kHz(0 dB) of deviation
Right/Mono [13] [12] -13 ÷ +13 dBm
In order to regulate the sensitivity level of the inputs, it is important to keep in mind that
the instantaneous modulation level is indicated in the predefined menu and that
indicates that the level is at 75 kHz. For a correct regulation, we advise to bring a
signal equivalent to the signal level of your own audio programme into the input of the
unit and regulate the corresponding trimmer until the instantaneous deviation coincides
with the 75 kHz indication.
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For the regulation of the levels of the sub-carriers’ inputs, a similar procedure can
be followed, with the help of the option “X10” which can be selected from the menu
Fnc. With this option, the indicated modulation level is multiplied per the factor 10,
so that the hachured indication of the predefined menu coincides with a deviation
value of 7,5 kHz.
PAs for the stereo version, there is an appropriate menu in which the levels of
the right and left channels with the corresponding nominal level indicators for the
maximum 75Khz deviation are indicated separately.
The position of the DIP switches that are needed to select the available options
is indicated on the silk-screen.
• Preenphasis:
ON
1 2 3 4
50 μs
ON
1 2 3 4 75 μs
• Impedance of L&R inputs (XLR type):
Switch 1: Impedance of R XLR ON inpu t = 6 0 0 Ω, OFF = 10 kΩ
Switch 2: Impedance of L XLR ON inpu t = 6 0 0 Ω, OFF = 10 kΩ
• Functioning modes / Impedance of MPX input:
Switch 1: Functioning mode ON = Mono, OFF = Stereo
Switch 2: impedance of MPX ON inp u t = 5 0 Ω, OFF = 10 kΩ
5.4 Software
The machine is provided with a two-line LCD display where a set of menus is
shown. An overall view of the machine’s menus is given in figure .
One of the following symbols may be present on the left side of the display,
depending on the case:
_ (Cursor) - The cursor indentifies the selected menu where you can have
access.
(Full arrow) - The parameter highlighted by the arrow can be modified. This
symbol is present in menu composed of more than two lines as an help in the
scroll menu.
(Three empty arrows) - The parameter highlighted by the arrows is in phase
of modification.
(Empty Arrow) - The arrow points out the current line, the parameter of which
cannot be modified. This symbol is present in the menus made up of more than
two lines to help scroll the menu.
ON
1 2
ON
1 2
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When turned on, the LCD display shows the “Main Menu” with the graphic
representation of the instantaneous modulation level and indication of the forward
power supplied:
The vertical bars near the title “Mod” indicate the progress of the modulation in
real time; the hachured bar indicates the maximum 75 kHz nominal modulation
level (100%).
In order to change the power level setted, select with the push-button GIU’ the
line which corresponds to the power and keep the ENTER button pressed until
you enter the modify mode.
The above line displays the instantaneous power reading (in this example 10W),
while the bar indicates the setted level. In order to increase the level, keep the
RIGHT/DOWN button pressed, in order to reduce it press the LEFT/UP button.
As the setted level increases or decreases, the bar gets longer or shorter in order
to enable the display of the current setting. Once the desired level is reached,
press ENTER to confirm and exit the predefined menu. Please note that the setted
value is anyway memorized, therefore when you press ESC or when the timeout
period is passed and no button was pressed, the power will remain on the last
setted level.
When you press twice on the ESC button while you are in the predefined menu,
the following selection view is displayed, and from this view it will be then possible
to enter to all the other menus:
To enter one of the submenus, select the name (that will be enhanced by a
flashing cursor) with the RIGHT or LEFT push-buttons and then press the ENTER
button.
If on the contrary, you wish to return to the predefined menu, you just have to press
again the ESC push-button.
In some cases, on the left side of the menu an arrow can appear. It means that it is
necessary to indicate the current line selected. When the arrow is full, the parameter
can be modified, while when it is empty, the parameter can only be viewed.
Note: The “L&R” menu is available only in the stereo version. In the mono version
the “L&R” inscription do not appear.
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