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KWL Broadcast is Indonesian manufacturer of FM and TV broadcasting equipment. Currently, we are covering four main areas :

  • FM transmitters
  • STL (Studio Transmiter Link)
  • TV transmitters
  • Transmitting antennas and accessories

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news  PRODUCTS
  Solid State AM-PDM Transmitter (Pemancar AM)



• 500Watt - 10.000Watt output power in continuous service : all parts used in these transmitters are oversized to guarantee the full power 24/24 hours even in hard environmental conditions.

• 522 – 1750 KHz: the frequency of these amplifiers can be easily field tuned from 522 KHz to 1750 KHz without any parts modification.

• High Efficiency Output. The amplifier uses strong and reliable Cold-Mosfets in modern Class-E configuration for RF Power Amplifier and Class-D (digital) configuration for PDM (Pulse Duration Modulation) Power Modulator, minimizes the losses, increases amplifiers efficiency and Lowering the power consumption. These systems are widely used in the broadcast field, that assure long life and low maintenance costs.

• Modularization System. Designed for the best system reliability

• Adjustable output power. The Solid state allows the adjustment of output power simply varying the input one.

• Electronic protections system assures an affordable and stable operation protecting units against major fault conditions. Every alarm event is displayed by front panel LEDs and can be resetted by manual control and/or automatic reset control.

• Full metering. All the main parameters of the amplifiers are front panel displayed by a complete measurement system.

• Soft-start circuit control: the gradual insertion of power supply eliminate transient problems during start-up.

• Forced air cooling. An oversized cooling system guarantees regular functioning and long life for the high power amplifier Module set even in hard environmental places.

• Meets or exceeds international standards for safety and electrical specifications.



Specification for AM-PDM Transmitter :

A. General :

1. Radio Frequency Range : 525Khz – 1700Khz
2. Modulation System : Final Stage Series Pulse Duration Modulation
3. Audio Frequency Response : 50Hz – 7,5KHz Flat Within +/- 1dB
4. Audio Frequency Distortion : Less Than 3% at 95% Modulation
5. Noise Level : Better than -60dB, 1Khz at 100% Modulation
6. Carrier Shift : Less Than 3% (1Khz, 100% Modulation)
7. Carrier Frequency Stability : Within +/- 2Khz
8. Audio Input Level : 0 to +10dBm Adjustable at 1Khz for 100% Modulation
9. Audio Input Impedance : 600Ω, +/-10%, Balanced
10. Audio Input Connector : XLR, Balanced, both L and R Audio Input
11. Output RF Impedance : 50Ω, Unbalanced
12. RF Output Connector : PL-259-Male, others on request
13. Modulation Capabilities : From 50Hz-7500Hz at 100% Continuous Modulation
14. Spurious : Below -45dB
15. Power Consumption : More than 65%
16. Ambient Temperature : From -10 to +45°C
17. Humidity : Less than 95%
18. Cooling System : Forced-Air Cooling
19. Power Requirement : AC-220 Volts, 50/60Hz, single phase
20. Protections (depends on models) :
• SWR, RF PWR Limit, Temperature
• PSU Over Current, Over Voltage
• Reset, on/off, stand-by (others on request)


B. AM POWER AMPLIFIER

Descriptions:
* Micro Controller : MICROCHIP 16F877A-20
* LCD Display : 16 Character, 2-Lines
* Devices : MOSFET ULTRA FAST Switching, Advance Power Technology
* RF - System : Class-E Polyphase / Multi phase RF Amplifier
* PDM - System : Class-D PDM Amplifier
* RF Modulated Output Power : 500-5KW (depend on models)*
* RF Output Connector : Floating PL-259 Amphenol ( others up on request)
* Drive : TTL 15V/p-p, Low Side and High Side Logic Push-Pull
* Power Supply : 300V/DC Current Flows depend on models*
* Protection : VSWR, Power Limit, Current, VPA, Temperature
* Cooling System : Forced Air Cooling
* Humidity : Less than 95%



C. ATU, RF-FILTER and COMBINER

Descriptions:
* Antenna Tuning Unit (ATU) DC Grounded for Lightening Protection
* Frequency Range : 522-1710Khz, Tuned at one Frequency
* Power Capability : 1000W-5000W (depend on models*)
* Low Pass Filter : Butterworth 3-Poles, 5 Element
* Line Section : True Lines Forward, Reflected, Modulation Monitor
* RF Output Connector : PL-259 (AM500C, AM1C), Flange (AM2.5C, AM5C)
* RF Spurious : Below -45dB
* RF Output Impedance : 50 Ohm, Unbalanced
* RF Metering : Analog Meter for more accurate reading



D. POWER SUPPLY UNIT

Descriptions:
* HV-PSA System : Linear Power Transformer Full Wave Rectifiying
* HV-PSA Output : 300V/DC/ Current Capability depend on models*
* LV-PSA System : Linear Regulated
* LV-PSA Output : +/- 15VDC 5A Symetrical
* RFI Filter : EPCOS High Power RF-Interference Filter
* Input Voltage : 220V/AC/50Hz/60Hz +/- 5%
* Protection : HV-Soft Start, MCB, MOV and Fuses
* PSA Metering : Analog Meter for more accurate reading


E. 19" STANDART RACK (height depends on models)


F. POWER OUTPUT (AM Transmitter Models)

Descriptions :
*AM-500C ( 500 Watt, PDM - Mono ), 0% Modulation
*AM-1C ( 1000 Watt, PDM - Mono ), 0% Modulation
*AM-2C ( 2000 Watt, PDM - Mono ), 0% Modulation
*AM-3C ( 3000 Watt, PDM - Mono ), 0% Modulation
*AM-4C ( 4000 Watt, PDM - Mono ), 0% Modulation
*AM-6C ( 6000 Watt, PDM - Mono ), 0% Modulation
*AM-8C ( 8000 Watt, PDM - Mono ), 0% Modulation
*AM-10C ( 10.000 Watt, PDM - Mono ), 0% Modulation


Features and specifications subject to change without notice.







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