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1kW Professional FM Radio Transmitter
- STEREO WITH AUDIO PROCESSING OPTION
- DYNAMIC RDS OPTION
- 48VDC or 90-260VAC OPTION
- USB 192 KHz 24 bit OPTION
- INCLUDES SHIPPING
- 5 YEAR WARRANTY
- EXCEEDS CE/FCC TECHNICAL SPECIFICATION
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LIMITED WARRANTY |
This 1kW transmitter has it all!! high power, CE compliance, RDS, stereo and audio processing. But the best feature of of this transmitter is none of these, the best feature is that it is BUILT to LAST. 1kW is high power and with the right antenna, for example an 8 way stacked dipole, and high ground it could propagate a signal up to 100km. Our 10kW EIRP system is a fine example of this.
Which Version Do You Need?
These are the two main versions of this transmitter:
◼ Stereo with RDS and Audio Processing Version
◼ MPX Version
These two versions cover 90% of all customer requirements. Other custom versions are available such as stereo only, no RDS, no processing etc. which we can also make if that's what you require.
You will find these two main versions shown in detail in the two following sections with descriptions of what they do and how they work. You should also see the price, INCLUDING delivery, to your country.
If you are still unsure, you are always welcome to contact us at em: info@aareff.com or ws: +1 829 6980733 and we're more than happy to advise you.
Do You Have A Question?
Stereo, RDS and Audio Processing Version
If you are not sure which version you want, then you definitely need this version. It is perfect for beginners because it adjusts the audio levels automatically and keeps the 1000 watt transmitter within the legal specifications required by the state regulator.
This version is also ideal for professionals who just don't need the all the hassle. This is because it includes everything in one enclosure. The audio processing keeps the audio level 'LOUD', but not too loud whereby it causes over deviation and contravenes your permit. The trick is to get the sound as loud as possible so you can compete with the other stations on the dial, but at the same time keeping your signal legal. This is a tricky balance to maintain, but this version in stereo with our internal audio processers does exactly this.
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The audio inputs industry standard 600 ohm +4 dBu balanced using XLR connectors.
In addition, this version INCLUDES RDS. This allows everybody to see your station name and more scrolling across the car radio display.
The RDS is not just ordinary RDS, it is fully programmable dynamic RDS. This means the transmitter can be connected to a PC by a USB cable. The RDS can be changed on the fly in real time by using USB PC CONTROL shown below.
Flat 30Hz to 76KHz MPX Input
This is for expert users who want to provide the MPX signal from an external source.
The baseband MPX audio input has virtually no tilt whatsoever on the low bass frequencies making it perfect for use with multiband processors such as Orban, Invonics, Stereo Tool, Omnia etc. Check the image of the test we made in MpxTool.
The PLL is loop is very slow, this is good as it maintains low frequency performance down to just a few Hertz. This low frequency response is heaven for processors.
This is achieved by a Hartley loosely coupled Push-Push voltage controlled oscillator (VCO) that is so stable it remains within 10kHz of it's tuned frequency free running when the DSS and PLL is disabled.
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This extreme level of inherent VCO stability means the PLL has a little work to do maintaining the frequency to an accuracy of less than 300Hz, the PLL is only giving it a slight touch. As consequence of this 1: low noise audio is achieved as talked about in the previous paragraph; and 2: the PLL correction voltage can be low pass filtered down to just a few Hz. With the super low frequency loop filter the low frequency audio at 30Hz is not mistaken or confused as frequency drift and passes through to the varicap completely unaffected which results in low frequency audio response which is essential for high performance audio processors
USB PC/RDS CONTROL
Download our free PC app that connects 'plug and play' to the transmitter / PLL DDS exciter via USB. You can see the PLL status and change the frequency and power directly from the PC interface. If you choose to add the optional RDS card, you can also change the PI, PTY and scrolling text of the radio from the interface.
Below are the download links for Windows:
https://www.aareff.com/1wpllm/pll14.4/pll14.exe
https://www.aareff.com/1wpllm/pll14.4/pll14.zip
By clicking on these links, Windows may show you a warning that the software is from an unknown publisher. We assure you that we wrote the apps and the files are perfectly safe, virus-free and come from our registered domain www.aareff.com, which you can verify at https://lookup.icann.org/en/lookup
Normal state when the device is connected: the PLL is LOCKED with an output power of 0.85W and a PLL phase of 2.33V
This shows what happens if the device loses its lock. We simulated a failure by placing our fingers on the oscillator coils.
This shows the return to normal with the user command FREQ:106.7 typed in the input box below. A value between 87.5 and 108.0 MHz can be set.
After pressing 'Send:' the display returns UPDATED FREQ 106.7 along with other technical information. This causes the transmitter to change frequency.
This shows another command, RDS-PI:ABCD typed for devices with the RDS card.
After pressing 'Send': the display returns UPDATED RDS-PI:ABCD instantly updating the RDS PI code.
This shows two additional examples of RDS commands:
RDS-TEXT:[write your message here]
RDS-PTY:[number from 0 to 31]
Text is plain ASCII up to 60 chars and valid PTY Codes shown below.
Shown below are the current commands available for USB PC Control and also the PTY codes for program type. We will be making further developments, improvements and more useful commands to this app in the near future. Keep checking this page for details.
◼ DEVICE-ID
◼ STATUS
◼ FREQ:[87.5 to 108.0]
◼ DDS-ADJ:[-1,0 or 1]
◼ PWR:[0 to 1]
◼ RDS-PTY: [0 to 31 list of PTY codes]
◼ RDS-PI: [0000 to FFFF]
◼ RDS-TEXT:[any string up to 60 chars.]
◼ RDS-ON
◼ RDS-OFF
Antennas
The transmitter will work with any 50 ohm antenna rated at 1000W or higher. Suitable antennas that we sell for this unit are:
• Vertical 5/8 Wave
• 4 Way Stacked Dipole
• 8 Way Stacked Dipole
• Circular Dipole
• Folded Dipole
Our 2.5kW, 5kW and 10kW EIRP packages include this transmitter packaged in with coaxial cable and a suitable antennas. These full systems are engineered to comply with the EU standards and regulations for licensed broadcasting and most other countries regulations in the world.
Temperature Resilience
The first version of this unit was designed for use in the middle of East Africa, so we had to make it good, in fact not just good, amazingly good. We didn't disappoint our client, it was installed 5 years ago and is still fully operational, running day in and day out in the heat of Africa. If the ambient goes beyond 40C, the internal temperature protection starts to back off the RF power, gently, not any abrupt cut out, just a little to keep the internal temperature below 70C.
VSWR Resilience
Under severe load mismatch conditions (poor SWR, Return Loss) the unit automatically folds back the power to a safe level to protect itself, the antenna and cables from damage. When the load becomes again, full power restores automatically and instantly. The front panel has a forward and reflected power meter, so you can monitor the state of your antenna all the time.
Construction
The complete 1kW transmitter is made up of one 3U enclosure and one 2U enclosure in strong 16-gauge steel, powder coated and baked in satin black. This type of metalwork can withstand the middle of a warzone and is military grade. The powder coating gives a difficult to scratch surface preventing the bare metal being exposed and corrosion. The front panels are standard 19 inches for standard racks.
Configuration
When we test this unit we need to test it at some frequency, it's obviously better if we test it at the frequency you want to us it on, then you can use it straight out of the box on delivery. But if you don't know the frequency, that's okay, the frequency, FM deviation and power is easy to set in a few minutes on the underside panel controls.
Compliance
The stereo version with audio processing and limiting meets all the regulatory standards required out of the box and pre configured. In fact if you send us a copy of your permit and it's conditions, we will set it up exactly to the specification. This equipment complies with EU/CE harmonised standards and FCC technical requirements for FM broadcasting. More information HERE
RF Specification
All stated measurements were made at 220VAC at 27 Deg. Celsius ambient temperature unless stated.
| Power Output | Adj. 1-1000 Watts into 50 ohms |
| Spurious Emissions | Less than -75 dB ref to carrier |
| Harmonic Emissions | Less than -70 dB ref to carrier |
| Freq Stability | +/- 1 KHz max. typ. +/-300 Hz |
| Deviation Sensitivity Stability | +/-2 % max |
| Freq Fine Adj | > +/- 1000 Hz |
| Freq Range | 87.5 to 108 MHz in 100 KHz steps |
| Out of Lock RF Muting | Less than -70 dB ref to carrier |
| Residual AM | Less than 0.5 % |
| Synchronous AM | Less than 0.5 % |
| RF Ruggedness | Any VSWR phase or length of time |
| Output Connector | DIN-716 |
| Operating Temp | -20 to +40 Deg C |
AF Specification
| Pre-emphasis | (50 uS/ 75 uS/ None) Selectable | |
| Audio Input Connector | Phono/ RCA type unbalanced sockets | |
| Audio Input Sensitivity | +4 dBu for +/- 75 KHz dev. | |
| Version | MPX | Stereo and Audio Processor |
| Signal To Noise Ratio | 80dB | 65dB |
| Frequency Response | 30Hz-76KHz | 30Hz-15KHz |
| Audio Distortion | Better than 0.1% / 60dB THD | Better than 0.1% / 60dB THD |
AC Specification
| Input Voltage | 90-264 V AC 135-370 V DC 47-63 Hz |
| Input Power | 1400W for 1000W RF OUT with RF SWR less than 1.5 |
| Working Humidity | 20-90% RH non-condensing |
| Safety Standards | UL60950-1 TUV EN60950-1 BSMI CNS14336 CCC GB4943 J60950-1 approved |
| EMC Emission | Compliance to EN55022 class B EN61000-3-2 3 FCC PART 15 / CISPR22 class B CNS13438 class B GB17625.1 |
| EMC Immunity | Compliance to EN61000-4-2 3 4 5 6 8 11 light industry level criteria A |
