25W | DMR -Elektronik

Product discription:

DDS digital signal synthesis, excellent audio, on-board stereo and RDS

The new STMAX 3015+ FM exciters combine more features into a small board than ever before. With DDS digital modulator, on-board stereo and RDS and all of this full controllable via LCD display with new 2-level MENU system and availability in 15W, 25W formats all powered from 12-15V this unit represents realization of dreams for most prospective radio station builders.

The design of the STMAX 3015+ series is based on MAXPRO 6015+ and also looks quite similar at first glance, however it comes with on-board DDS modulator and DSP stereo encoder with RDS. The result is a rugged and solid FM exciter with completely flat power output across the entire FM band at 15W, 25W, designed to run silently and cool 24/7. Since the new design featuring larger heatsink with copper spreader was so much better and completely stable. 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.

How is STMAX3000 series different from the MAXPRO6000 series?

- On-board stereo and RDS encoders.
- New larger heatsink
- DDS digital modulator. This ensures very good audio, but creates spurious artefacts about -50dBc
- All parameters adjustable from the LCD, including RDS RT, PS, PI and others
- 2- level menu system groups similar parameters together making adjustment easier
- Comes also with new LCD with rotary encoder. This new LCD offers password protection and other cool features.
- Can't be used with MPX STL links as there is no MPX in

Technical specs:

• RF Output Power: 0 to 15 Watts, 0-25W (fully variable via LCD in nice gradual steps), LCD power adjustment range can also be limited     to 0-1W, 0-2W, 0-3W, 0-4W ... 0-15W, 0-full, this is done with a jumper (exact options vary depending on model).
• Output connector: BNC female
• Output Impedance: 50 Ohms
• Frequency range: 87.5-108MHz
• PLL Steps: 100KHz-500KHz, adjustable
• Frequency stability: +/- 20Hz
• Spurious/Harmonic rejection: Harmonics: >50dB, Spurious: >-50dBc
• Power Supply 15W: 12-15V/2.5A
• Power Supply 25W model: 12-15V/4.5A
• Power connector 15W, 25W model: New design with plugin with 2 screw terminals or standard barrel with 2.1mm positive center pin
• Quartz Locked PLL Frequency Control, DDS digital modulator
• No Expensive Test Equipment Required
• Audio performance: Less than 0.1% distortion, 20Hz-15KHz
• RF output ruggedness: SWR protection, temp protection
• Polarity protection, temp protection
• Pre-emphasis, 50uS, 75uS or none selectable via LCD
• Stereo pilot level adjustable via LCD
• RDS pilot level adjustable via LCD
• MPX level adjustable via LCD
• Audio Input Impedance: 1Kohm, unbalanced
• Audio Input Level: -10dBu, +4dBu (selectable from LCD)
• Stereo separation: >50dB
• S/N ratio: >90 dB 
• PC Board Size 15W, 25W : 100x125mm
• Audio connectors: 2x RCA jack, 14-pin connector for external input board with balanced XLR inputs
• RF monitor: solder pads