Leaming Industries' MTS-5 BTSC stereo generator provides cable systems with a high quality BTSC (stereo TV audio) signal while conserving rack space. Each MTS-5 is self-powered and up to two MTS-5s may be mounted into one 1-3/4" rack space. Each MTS-5 accepts Left and Right baseband audio and generates a BTSC stereo signal.
For versatility in interfacing the generator with a TV modulator, the MTS-5 provides composite baseband and 4.5 MHz outputs, as well as separate video and 4.5 MHz loop-throughs. Therefore, the MTS-5 can be used with most TV modulators.
The Built-in Stereo and SAP AGC's (Automatic Gain Control) are provided to maintain average program levels within a reasonable range without reducing the dynamic range to the extent that quiet passages are no longer quiet and loud passages are no longer loud. It includes a gated-gain low-distortion compandor with a fast attack and slow release. When the program level falls over 20 dB below normal, the compandor assumes that there is a pause in the program and holds its gain setting for 10 seconds. The compandor then slowly resets its gain to 0 dB. The AGC is enabled by a front panel switch. All controls are easily accessible from the front panel. A Bessel-null test-tone is built in for simple and accurate set-up when using the composite baseband output.
FEATURES:
SPECIFICATIONS
OVERALL PERFORMANCE
FREQUENCY RESPONSE:
20 Hz to 15 kHz, ±1 dB
SAP: 20 Hz to 10 kHz, ±1 dB
DISTORTION:
0.5% maximum THD
SEPARATION:
>26 dB, 20 Hz - 13.5 kHz
>30 dB, 20 Hz - 10 kHz, typical
SIGNAL-TO-NOISE RATIO:
>65 dB, overall through receiver and expander
PILOT REJECTION:
>50 dB
COMPRESSORS, L-R & SAP:
dbx licensed (BTSC Standard)
DISTORTION:
Stereo: 0.5% max THD
SAP: 1% max THD
SIGNAL-TO-NOISE RATIO:
>65 dB, overall through receiver and expander
PILOT REJECTION:
>60 dB
AUDIO PROCESSING:
Automatic Gain Control (AGC)
2:1 Compandor (dB), ±10 dB
TEST TONE:
2.5 Vp-p at 10.4 kHz
First Bessel-Null Frequency for 25 kHz
deviation of audio carrier
AUDIO BASEBAND INPUT
NOMINAL INPUT LEVEL (APL):
0 dBm, adjustable ±10 dB
(Peak Program Level is 10 dB above APL)
AUDIO INPUT IMPEDANCE:
100 k-ohms, balanced
BTSC OUTPUTS
COMPOSITE STEREO BASEBAND OUTPUT LEVEL:
5 Vp-p into hi-Z load
(Source imp. 75 ohms)
4.5 MHz OUTPUT:
4.5 MHz Output Level
.4 Vp-p into 75-ohm loop, adjustable
4.5 MHz Harmonics
-50 dB re .250 V p-p or better
Deviation, peak
±25 kHz, mono
±50 kHz, stereo
±100 kHz, maximum
Audio Carrier Stability
Frequency-locked to horizontal sync
FRONT PANEL INDICATORS
L&R Peak-reading 10-segment LED bargraphs
A & B Input selection LED
Video Sync/4.5 MHz Carrier Frequency Unlocked LED
Stereo Mode LED
AGC ok
FRONT PANEL CONTROLS
Input Level ("A" L&R and "B" L&R)
A/B Input Switch with remote position
Stereo/Mono/Test Switch
4.5 MHz Carrier Level
AGC and SAP on and off
CONNECTORS
Four F-type (BNC optional):
4.5 MHz Output Loop
Video (sync) Input Loop
Remaining connectors are detachable
screw-terminal plug blocks:
Two 5-pin plug blocks:
"A" Audio Input and "B" Audio Input:
Pin 1 Right +
Pin 2 Right -
Pin 3 Ground
Pin 4 Left +
Pin 5 Left -
One 4-pin plug block:
Pin 1 SAP
Pin 2 Ground
Pin 3 BTSC Composite Baseband Output
Pin 4 Ground
One 5-pin plug block:
Pin 1 A/B Input Select
Pin 2 Sync Output
Pin 3 Ground
Pin 4 18 V Out
Pin 5 SAP Remote
Optional
SAP (Second Audio Program) board can be added at any time
POWER AND MECHANICAL
POWER:
105-125 V, 50-60 Hz, 10 Watts
SIZE:
1.6" H x 8.75" W x 18" D
Mounts on 1/2 of a PMU422 19" panel mount
WEIGHT:
3-1/2 lb. net, 6 lb. shipping
Specifications subject to change without notice.
LEAMING INDUSTRIES
Phone (800) 4-LEAMING
Copyright 2004, Leaming Industries
1/04