20 W LD STL Series
Frequency directly programmable from Front Panel via LCD Display menu
Composite
940-960 MHz STL’ s
STL Transmitter now with 20 W power capability
Available also for 220 – 440 MHz
- STL Transmitter now with 20 W power capability
- Completely Microprocessor supervised
- Frequency directly programmable from Front Panel via LCD Display menu
- Telemetry and remote controllable settings and functions
- State of the art audio quality
- High sensitivity & high selectivity receiver, designed to withstand the most hostile RF sites
- Excellent stereo separation
- Meets or exceeds all FCC and CCIR requirements
Power Output :
LDT STL Transitter:
0.5 W to 20 W, adjustable
LDT STL – TX Specifications
Frequency Range:
940 – 960 MHz directly digitally programmable in 10 kHz increments
(on request, any selected 15 MHz range between 220 MHz and 440 MHz)
Frequency of Operation:
Synthesized, microprocessor controlled
RF Output Connector / Impedance:
Type “N” female / 50 ohm
Frequency Stability:
Better than 1 ppm (±1 kHz), -10° to 50° C (14° to 122° F)
Modulation Type:
Direct FM at carrier frequency
Asynchronous AM S/N ratio:
Better than -70 dB referred to 100% AM, no de-emphasis
Synchronous AM S/N Ratio:
Better than -50 dB referred to 100% AM (FM modulation ±75 kHz at 400 Hz), no de-emphasis
Transient Intermodulation Distortion:
< 0.1% (typ. 0.05%) measured with a 3.18 kHz square wave & a 15 kHz sinewave, FM 75 kHz
Front panel displays:
Frequency, Modulation, Fwd Pwr, Ref Pwr, DC V, Current, Temperature, Alarms & Status indication for all functions
AC Power requirement:
Extended range 85 to 260 V, 50 or 60 Hz, single phase.
AC Power Consumption:
approx. 64 VA at full power
Ambient Temperature Range:
-10° to 50° C (14° to 122° F)
Spurious and Harmonic Emissions:
Meets or exceeds all FCC and CCIR requirements
Modulation Capability:
MPX / Composite program + RDS/RBDS
+ 2 SCA Subcarrier channels
Audio Inputs:
MPX / Composite: Unbalanced BNC and Balanced XLR (selectable)
Mono: Balanced XLR
SCA / RDS / RBDS: Unbalanced BNC (2)
All levels adjustable from – 20 dBm to +13 dBm, typ. set for 3.5 Vp-p (1.237 Vrms / 4.1 dBm)
Pre-emphasis (75 µsec for FCC, 50 µsec for CCIR), defeatable for flat inputs
RF Monitor: BNC, approx. – 30 dB
Interlock: BNC, mutes RF when grounded
Serial Interface: DB9 female RS 232
Telemetry & Remote Control: DB15 female
Composite FM S/N Ratio:
Better than 80 dB below 75 kHz deviation measured in a 40 Hz to 75 kHz bandwidth, de-emphasised, RMS detector
Composite Total Harmonic Distortion:
Better than 0.1%
Stereo Separation:
Greater than 65 dB
Composite Amplitude Response:
±0.2 dB or less, 40 Hz – 53 kHz
±0.3 dB or less, 53 kHz – 100 kHz
Front Panel Size:
483 mm (19″) W x 88 mm (3½ “) H
(2 RU standard rack spaces high)
Overall Depth: 344 mm (13½”)
Net Weight: 6 kg (13.2 Lbs)
LDR STL – Receiver Specifications
RF Input Connector/Impedance:
Type “N” female, 50 ohm
Frequency Range:
940 – 960 MHz directly digitally programmable in 10 kHz increments
(on request, any selected 15 MHz range between 220 MHz and 440 MHz)
Sensitivity:
Monaural, – 67 dBm for > 68 dB S/N RMS, de-emphasized, 75 kHz deviation
Composite, – 47 dBm for > 68 dB S/N RMS, de-emphasized, 40 Hz to 15 kHz
Stereo (Left and Right Channel, decoded, de-emphasized), – 47 dBm for > 62 dB S/N RMS
Composite Total Harmonic Distortion:
0.4% or less
Composite amplitude response:
±0.2 dB or less, 40 Hz to 53 kHz
±0.6 dB or less, 53 kHz to 100 kHz
Stereo Separation:
Greater than 50 dB @ 1 kHz
Greater than 40 dB, 50 Hz to 15 kHz
Crosstalk:
Main to Sub / Sub to Main, Greater than 45 dB
Selectivity (static):
-20 dB @ 200 KHz
-35 dB @ 300 KHz
-55 dB @ 400 KHz
LCD Displays: Frequency, Modulation, RF Signal Level, Alarms & Status indication for all functions
Audio Outputs:
Mpx / Composite: Unbalanced BNC and Balanced XLR (selectable)
Mono: Balanced XLR
SCA / RDS / RBDS: Unbalanced BNC
10.7 MHz IF Monitor:
BNC connector
RS232: DB9
Telemetry & Remote Control: DB25
Levels: All levels adjustable from -20 dBm to +13 dBm, typically set for 3.5 Vp-p (1.237 Vrms / 4.1 dBm)
Ambient Temperature Range: -10° to 50° C (14° to 122° F)
AC Power requirement:
Extended range 85 to 260 V, 50 or 60 Hz, single phase,
AC Power Consumption: approx. 18 VA
DC PWR Input:
24V DC, approx. 0.6 A
Front Panel Size:
483 mm (19″) W x 88 mm (3½ “) H
(2 RU tandard rack spaces high)
Overall Depth:
344 mm (13½”)
Net Weight:
5.5 kg (12.1 Lbs)
