The DSL-300 speech limiter is the next generation of the decommissioned popular DSL-100 limiter which includes these new improved features:
- On board voltage regulation, 28 VDC maximum input voltage
- Reverse power protection diode
- Easy to use and calibrate
- Separate input and output level adjustment potentiometers
- Limiting level LED indicates when unit is properly limited
- Easy to connect wire screw posts for DC power and Audio I/O
- Standard 600 ohm I/O impedance (special order for unbalanced)
- User configurable I/O impedances other than 600 ohms
This unit is designed to address a common problem in wireless voice communications today: To maintain quality speech content and control the deviation levels at all times. Once easily calibrated to your radio transmitter, the DSL-300 will provide +/-12 dB of gain to your transmitted audio levels while ensuring low distortion and no clipping of the audio signal.
Ideal for HF, VHF, UHF and link transmitter applications, all users operating on your radio system will be driving the transmitter with the same audio levels. Users with low deviation levels will sound just as good as the user with the highest level of deviation. The device does not enable "Hot" users to drive the transmitter into hard limiting (clipping) thereby reducing the quality of their transmission.
When used for telemetry purposes, the DSL-300 provides nominal deviation with both weak and strong signals. This is an important key feature for linked voice or other telemetry / mixed signal systems. For example, a user with an average frequency deviation of 2.5 kHz will now be re-transmitting with a typical deviation of 3.0 kHz or whatever you have the DSL-300 calibrated for.
-
Limits Audio Deviation to Specific
Levels
Extremely Fast Attack
and Decay Times
40 dB Dynamic Limiting Range Far superior to AGC
Processors
Specifications
| Parameter | Symbol |
Min. |
Max. |
Units |
|---|---|---|---|---|
| Operating Voltage (12 VDC Typical) | VSUP | 11 | 28 | VDC |
| DC Current Draw | ISUP | 25 | 40 | mA |
| *Input Impedance | ZIN | 600 | 600 | Ohms |
| **Input Impedance Un-Balanced | Zin | 10,000 | 10,000 | Ohms |
| Output Impedance | ZOUT | 600 | 600 | Ohms |
| - 3 dB Frequency Bandwidth | FBW | 300 | 3,400 | Hz |
| Total Harmonic Distortion Below Limiting | THDBL | - | .01 | % |
| Total Harmonic Distortion Above Limiting | THDAL | - | 2.0 | % |
| Input Limiting Range(Balanced) | - | -30 | +3 | dBm |
| Input Limiting Range (Un-Balanced) | - | .03 | 4.0 | Volts P-P |
| Attack Time @ 1 KHz | TA | - | 500 | µS |
| Decay Time | TD | - | 20 | mS |
Absolute Maximun Ratings
| Parameter | Max. |
|---|---|
| Ambient Operating Temperature | 0º to 50º C |
| Maximum Supply Voltage (diode protection) | 28 VDC |
| Power Dissipation | 360 mW |
Mechanical Specifications
| Width | Length |
Height |
|---|---|---|
| 5.0" | 1.75" | 0.75" |
**Special Order un-balanced unit
