STLMAX VHF/UHF Zelfbouw STL modules

Main features:

- Synthesized from 45-850MHz (specify 10MHz segment at the time of ordering)
- The transmitted and received frequency can be set by digital front panel (UP/DOWN keys)
- Suitable for MPX systems (stereo encoder in studio) or for 2-channel systems (2 audio channels, left+right, with 19KHz notch filter)
- Built-in speaker driving amp for easy monitoring at the receiving side
- Low THD distortion: the THD value with stereo or mono demodulated and deemphasized signals is negligible
- Flat frequency response: due to the latest generation technology and the components precision the flatness of frequency response is absolute
- Low noise: the excellent signal to noise ratio either in mono or in stereo allows the use of this STL’s in multi-hops networks without decreasing the audio quality
- High sensitivity: it allows for more range with smaller antennas
- Great RF immunity: allows to operate in most hostile RF environments
- High adjacent channel rejection: obtained thanks to the excellent mechanical shielding and the precision of RF filtering
- High frequency stability with the internal temperature compensated crystal reference
- Integrated LCD Display: complete diagnostic and measurement front panel LCD displays
- Integrated information display and protection controls: for all transmit parameter and protection for malfunction

Technical specs:

- Transmitter is based on MAXPRO6000 so if you've used MAXPRO5000 or 6000 it will be very familiar to you
- Synthesized from 45-850MHz (specify 10MHz segment at the time of ordering)
- Modulation: FM, ±75 KHz peak deviation
- Frequency stability: <±100 Hz
- RF Output Power: 0 to 25 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
- Output Impedance: 50 Ohms
- PLL Steps: 100KHz-500KHz, adjustable
- Spurious/Harmonic rejection: Harmonics: >50dB, Spurious: >-75dB
- Power Supply 15W: 12-15V/3A or car battery
- Power Supply 25W/50W model: 48V/1.5A/2.5A
- Quartz Locked PLL Frequency Control
- Ultra Stable, Ultra Clean Output
- 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 15W, 25W and 50W model: 100x125mm 
- Weight: 0.4Kg
- Audio input: solder pads

STL transmitter connectors
- Audio solder pads
- Antenna output: BNC
- Power connector (12-15V or 48V depending on model)

What is included with the transmitter?
- The PCB board and LCD display. You will need to get an antenna, enclosure, power supply, a small fan and possibly a stereo encoder.

Difference between MPX and stereo STL
- You can just use the STLMAX exciter directly as MPX link or you can feed the audio through stereo encoder (use se2000 or se5000 please).



Technical specifications for receiver:
- Two-board design, RF receiver board + audio break-out board with XLR outputs and notch filters
- Available for frequency: 45MHz-850MHz (specify 10MHz segment at the time of ordering)
- Built-in speaker output for easy monitoring
- Sensitivity: ~1uV 10dB SINAD (varies with frequency band)
- Frequency response MPX: 20 Hz to 60 KHz ±0.1 dB
- Stereo separation: 20 Hz to 15 KHz >40 dB
- 19KHz notch attenation: > 60 dB
- S/N Ratio : >65 dB @-40 dBm , 75 KHz dev. and 1 KHz mod.
- THD : 20 Hz to 53 KHz <0.3%
- Selectivity: ±160 KHz at -3 dB IF BW, ±500 KHz at -62 dB IF BW
- Image rejection: >65 dB
- Stereo audio output impedance: 50 ohm balanced
- Stereo audio output connector: RCA/CINCH female
- MPX output impedance: 75R
- MPX output connector: BNC female and XLR balanced
- Headphones output: >2x0.2 W stereo at 32 ohms
- Headphones output connector: 3.5mm stereo phone jack
- RF input impedance: 50ohm
- RF input connector: BNC Type - female
- Power: 12-15V DC, 1A
- Operating temperature range: -15 to 50C
- Dimensions RF receiver board: 125 x 100 x 30 mm
- Dimensions audio breakout board: 80 x 100mm
- Weight: 0.5Kg

STL receiver connectors
- Antenna input: BNC
- Power connector (12-15V 1A)
- 2-pin jumper for small speaker 
- 3,5mm stereo phono jack for earphones
- 2x stereo output (RCA)
- BNC MPX output
- 3-pin XLR balanced output

IMPORTANT:
At the time of ordering please specify 10MHz frequency band, for example 210-220MHz.