Compact lightweight unit
 LDMOS power design
 FM Band Harmonic filter
 8bits Microcomputer  PLL
 Digital stereo encoder DSP
 Built in limiter/compressor
 LCD display Fan cooled
 Electronics Alarms and fault monitoring
  DB9 Type DJ remote control
 Loop through / External MPX capable for RDS (optional)
 Switchable/Manual settings
 RF power control  
 VSWR and overheat antenna fault, overdrive  protection.
CCIR/FCC/UL test standards.

AlfaThai FM150 FM350 FM500DSP Model

The AlfaThai model FM150 FM350 FM600DSP is lightweight compact professional specification fit in 2U type rack-mount for exciter and fm amplifier configuration. AlfaThai has design for FM broadcast transmitter both non-education and commercial 24/7 operation. The exciter rf output power is adjustable from 0-175watts  for FM150DSP model and 0-380watts for FM300DSP and 0-650watt for FM500DSP model with dual mode rf power output protection which one on final rf transistor for exciter and one for final rf amplifier to antenna fault monitor or over driven your exciting final rf power or  to prevent damage on your FM power amplifier. Ensure your system provide full power all time 24/7 operation purpose. The Frequency is adjustable from 87.5 to 108 MHz in 100Khz or 50 khz or 25Khz step selectable from the front panel graphics display control system. A Key lock setting the frequency disables the menu system from changing the frequency ensuring no unauthorized frequency changes.

The AlfaThai FM150 FM350 and FM600DSP is LCD graphics display on the front panel can indicate and control frequency, rf output adjust both from software as bargraphics level or manual rf power adjustment selection by internal jumper, DSP audio parameter setting such audio L or R channel level, Bass and Treble loud and clear, compress/limiter gain control.  The RF power amplifier section are equipped with digital meter can indicate forward and reverse power with LED indicator to alarm status monitor.

The Rear panel contains XLR balance line for all standard model, provides professional audio support with more than 65db stereo separate while economic system is provides stereo separate >45 db with SPDIF audio connector  and the top system build-in internal compression/limiter application, You can any change by software controls on Stereo Generator pcb, Optional DIN-Type 9 way or DB9 type for remote control and status monitor,  Second option is BNC for multiplex output from the internal digital stereo generator, BNC for multiplex input to the exciter for loop through operation and external processor input is an optional. Please confirmed your spec while place an order.

The RF output for exciter  is UHF-SO239 while N-Type is an output from fm power amplifier.  Main AC input is 176-260Vac and fused protect IEC power connector while utilize mini auto breaker for all export model. The  transmitter is fully configurable and the limiter and stereo encoder can be switched in and out of circuit. Jumpers available on board for pre emphasis, clipping, processing mode (clarity/loud), stereo/mono, and limiter on/off upon stereo generator model etc for some model.

The microcomputer  8bits control PLL system allows perfect transmitting frequency and audio flatness to below 20 Hz. AFC bounce and modulator overshoot are a thing of the past. You now can pass that low bass without distortion and overshoots and obtain that extra low frequency stereo separation. The exciter final amplifier is based modern MOSFET device while LDMOS technology apply for the exciter. A fresh air tunnel through the transmitter keeps cool air running right through the heatsink. The amplifier is digital type control and protected from damage by high current or over voltage, high temperature control systems and antenna fault (SWR) monitoring.

The exciter is turned back into the safety zone should a fault occur, keeping you on air rather than shutting down completely and taking you off air. Internal harmonic filtering keeps your RF signal clean and compliant to FCC/CCIR  standards.  The transmitter contains fully approved efficient switched mode power supply modules with a universal input voltage range from 176-260 Volts AC by switches mode, Ensuring compatibility of any mains system WORLD-WIDE.

RF  POWER MODULE AND DIGITAL RADIO  CONTROL  SECTION

RF Power from Exciter

Each the exciter model 0-15W Watt front panel adjustable by pot and/or software

External RF Amplifier

FM150B, 350B, 600B

Electronics device

RF Power LDMOS  technology with final rf out Low Pass Filter

Connector

UHF-Type 50 Ohm SO-239 ( N-Type for RF Power amplifier rf output to antenna)

Harmonics

Better than -85 dBc  on Exciter and Better -65dBc for fully system integrated

Spurious

Better than -90 dBc  on Exciter and Better -80dBc for fully system integrated

VSWR protection

Automatic Fold back above 1.5:1 force off-air and release by reset switch

S/N

>80dB

RF Leakage 

-4   0.5dB@ PLL unlock or tune

Frequency

87.5 - 108 MHz   +/- 75Khz FM deviation 

Frequency

Steps 100/50/25kHz  selectable  All adjustable from the front panel

Frequency Selection

Front panel menu system

Frequency Control type

Microcomputer control Phase locked loop

Frequency Range

87.5-108MHz and 76-90Mhz for Japan version, on demand.

Frequency Display

LCD

Over temperature

Automatic force off-air to prevent your final rf output transistor

Frequency Stability

+/- 20 Hz

MPX Input and Option

BNC  from real panel  while audio input level control is optional

MPX Input Response

+/- 0.3 dB 5 Hz to 100 kHz

MPX Input Level

-10dB to +10dbB (adjustable)

Modulation

Direct Frequency Modulation  

DSP  DIGITAL  AUDIO AND  STEREO  GENERATOR  SECTION

Subcarrier Generation

Microprocessor Generated (over sampled)

Pilot

19kHz +/- 2 Hz

Pilot Generation

Microprocessor Generated (over sampled)

Output Level

Internal direct connect, and (BNC real panel option) 0dB

15 kHz Filtering

>40dB at 19kHz

15kHz Overshoot Filter Clipping

On or Off  by

Spurious > 80 kHz

>60dBr

Spurious >160 kHz

>80dBr

Stereo Separation

>70dB (20Hz-15kHz)

BUILD-IN  DIGITAL  AUDIO  LIMITER / COMPRESSOR

Audio Input Levels

-10dB  to +24dB for 75Khz deviation (Type +18dB for limiting )

Audio Input Connectors

XLR balanced  with EMI/RFI shielded  

Input CMRR

>65dB

Audio Distortion

<.2% at limiting 1 kHz (clarity mode measure on PLL module)

Frequency Response

>20 Hz to 20khz +/- 0.5db (0 us Pre-Emphasis)

Limiter Control Range

>22dB (0 us Pre-Emphasis)

Input Impedance

10k Ohms  XLR Balance mode

Pre-Emphasis

0,50 and 75 uS  by onboard DSP control

Process Modes

Clarity and Loud  by onboard DSP control

Clipping

On or Off    by onboard DSP control

Stereo/Mono Selectable

On or Off  by onboard DSP control

OTHER

Front Panel Control System

3 Buttons, 30x80mm LCD Display, 1 Key lock, On/Off-Air switches, LED Digital meter, antenna alarm/reset  forward/revert power.

Cooling

2 - 4  Depression Fan 220VAC with thermal fuse protection  size 8x8cm

External Control/Monitor

DJ remote monitor with 9 Way D-Type (option)

Front Panel Metering status

The Exciter is LCD while second LED/7 segment display with/Without selector selectable mode for  RF power meter. 

Front Panel standard indicator/Status

Power On, PLL, Stereo, rf power gain control

Real Panel Control System

AC input, Power On-Off, Reset Breaker, Audio Input, RF Output, fuse ac input, fuse ac fan, fuse dc.

Real Panel Connector

UHF-SO239, Ground Connector, XLR or SPDI, N-Type and BNC for MPX optional

RF Section Protection

VSWR, Antenna Fault, Temperature, RF Gain Disable and LPF for final output

Electrical Protection

Over/Under Voltage and current, Temperature, Thermal fuse for AC Fan or fuse

Final  Lab Test  to Comply all country Regulation Requirement

Final test and comply to all your  regulation  requirement, QC by our  Lab test equipment consists of: Tektronix 492 (100KHz-330GHz) Spectrum Analyzer, HP8590A + HP8443A + HP85029A + HP54503A +HP435B Broadcast Test Set and Analyzer,  Racal 1992  10Hz – 1.2GHz frequency counter,  Rohde & Schwarz Broadcast Audio Generator 1Hz-600KHz etc!!!!!

Manufacture Certificate

We offering QC test data enclosed our product for all regulation reference.

Size

Standard 19 Inc Rack mount, (Approx 80mm x 420mm x 380mm) 2U type

Weight (approx)

3.5-5.5kg  upon model

AC Voltage Input

176-260VAC switching power supply

Power Connector

IEC, FUSED and Switchable breaker

Switched Mode Supplies Approvals

UL/TUV/CE

Warrantee Period

24 Month after payment

Warrantee voided

No authorize is opened equipment cover or repairs or modification.

Warrantee condition

Normal Operated only, Two times System Alignment at our facility, For on-site services: First installation is free and next times will be transport charge only, Due to switching power is used internal equipment, User must be provide electrical stabilizer and good electrical ground with lightning protection for normal operated. 

Repair  Fee

All warrantee No services fee of charge, On-Site service transportation charge, for A damage of RF parts and power supply is spare parts charge plus 30% off. Other parts are free of charge.

After warrantee voided

All services offer year to year maintenance contract.

General  services fee

All parts for  repair is 20% off,  Our facility Service charge 50USD flat rate/times