Qsonic PLL/VCO, excellent bass response, 25W and much more!

The new MAX PRO 4025+ FM exciter brings more power, completely redesigned VCO/PLL subsystem and a number of hot new features, including RS232 remote control, telemetry, current draw monitoring and ALC (Automatic Level Control). It covers entire FM band from 87.5 to 108MHz without tuning and offers up to 30W of clean RF power.

The design of the MAX PRO 4025+ is the result of over 1,000 hours of research and development, encompassing mathematical analysis, computer simulation and modeling, and numerous prototypes and experiments spanning over a one year period. The result is a rugged, high quality 25W FM exciter designed to run silently and cool 24/7.
The MAX PRO 4025+ is purposely over-engineered, using the very best components and materials that can be located. MAX PRO 4025+ is built the way you would build it for yourself if you had the time, knowledge, money, and inclination to do so. Why wait? Your dream FM exciter is a reality right now!

The exciter carries a one year limited warranty on parts and labor against defects in materials and workmanship, except the RF final transistor.

You can find the manual for this (and other products) here.

How is MAXPRO4025+ better than MAXPRO3000+?
- MAXPRO4025+ gives up to 30W of power
- MAXPRO4025+ has telemetry data header
- MAXPRO4025+ has completely flat audio modulation sensitivity level
- Improved drain efficiency, less heat generated per watt of RF power
- Improved drive circuit helps increase efficiency firther
- MAXPRO4025+ also shows current consumption and modulation level on the LCD
- MAXPRO4025+ does not have DIP switch and requires LCD to set power

What parameters can I change via remote control?
Its best that you look at the screen capture below. The program may change slightly over time as we make enhancements, but the main features will remain as below:

Can I upgrade my CyberMaxFM+ 15W transmitter with new exciter?
Sure, just exchange the boards, take the 3000+ out and replace it with 4025. Don't forget to use stronger power supply!

What is the IO board and why do I need it?
IO board is required, if you want to control MAXPRO3000+ remotely via RS232. It plugs into the LCD control module.

What is the ControlMini1 board and why do I need it?
ControlMini1 board is only used when you install this exciter in an enclosure together with amplifier. It can than be connected to mains power supply to control the voltage and with that the output power. It plugs into the MAXPRO3000+ via flat cable. You can read more about this in the manual.

What is the ControlMini2 board and why do I need it?
ControlMini2 board is only used when you install this exciter in an enclosure together with amplifier. It can than be connected between the exit from filter and antenna connector to provide power, swr, temperature and voltage information to the FM exciter. It plugs into the MAXPRO3000+ via flat cable. You can read more about this in the manual.

What is the Software+IOBOARD for changing logo?
This is a combination of special unlocked version of software and RS232 IO board, which is required to control MAXPRO3000+ remotely via PC/RS232. It plugs into the LCD control module. Software lets you change welcome text (logo); you can replace that text with your company name for example. Your customized text will be saved and used at every power-up.

What is that tiny switch?
MAXPRO4025+ is delivered without ON/OFF switch, there is a wire bridge across contacts that can be cut in the middle and connected to the switch. This is the switch we use in our 19" racks, it also has a built-in LED diode for better effect. Instructions on connecting this switch can be found in the manual.

Technical specifications:
- RF Output Power: 0 to 25 Watts (30W max., 25W typ, fully variable via LCD)
- Output connector: BNC
- Output Impedance: 50 Ohms
- Frequency range: 87.5-108MHz
- PLL Steps: 50KHz
- Frequency stability: +/- 20Hz
- Spurious/Harmonic rejection: Harmonics: >50dB, Spurious: -90dB
- Power Supply: 11-15V/5A or car battery
- Power connector: 2.1mm power socket, center (+)
- Quartz Locked PLL Frequency Control
- Ultra Stable, Ultra Clean Output
- No Expensive Test Equipment Required
- Audio performance: Less than 0.1% distortion, 20Hz-75KHz
- RF output ruggedness: SWR protection
- Polarity protection, temp protection
- Pre-emphasis, 50uS, 75uS or none
- Audio Input Impedance: 10Kohm, unbalanced
- Audio Input Level: 0 dB
- S/N ratio: >90 dB
- PC Board Size: Same as MAX PRO 3000+, 100x125mm
- Audio connectors: RCA jack, optional MCX
- RF monitor: solder pads