The SAP-1 and SAP-2 are each designed to encode a monaural audio signal into the standard BTSC format for use as a Second Audio Program channel for television transmission. Typical uses include transmission of second Language programming, local radio stations, promotions of pay services, weather reports, and FSK data.
Now the SAP-1 and the SAP-2 have AGC
The New Built-in AGC (Automatic Gain Control) is 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.
SAP-1 INDEPENDENT SAP GENERATOR
The SAP-1 generator may be used in conjunction with virtually any existing BTSC-compatible mono or stereo TV-audio modulator. The SAP-1 may be used independently or with a BTSC stereo encoder which has an input for a SAP carrier. Two audio inputs are provided on the SAP-1; one for the SAP/A program and another for the MAIN/B program. A separate level control is provided for each input. When used on a mono (not stereo) channel, the main and SAP inputs are processed and combined into a composite multiplex signal which is sent to the TV-audio modulator. When used with stereo the SAP-1 can be configured for two SAP audio inputs, facilitating switch-over from the primary SAP program to an auxiliary input, such as a local commercial insert. The alternate signal is selectable by either a front panel switch or by remote control (contact closure).
Each SAP-1 is powered by a built-in power supply and is enclosed in an aluminum case which can be mounted on 1/3 of a Leaming PMU413 19-inch panel mount. These panel mounts accommodate up to three units.
SAP-2 DEPENDENT SAP GENERATOR
The SAP-2 is designed specifically for use with Leaming's MTS-2 series and the MTS-4A series BTSC stereo generators. When used with the MTS-2 series generators or the MTS-4A, the SAP-2 derives it video sync and operating power from its related stereo generator. Two audio inputs can be provided to the SAP generator, facilitating switch-over from the primary SAP program to an auxiliary input, such as a local commercial insert. Individual level controls are provided for each input. The alternate signal is selectable by either a front panel switch or by remote control (contact closure).
Each SAP-2 is enclosed in an aluminum case which can be mounted on 1/3 of a Leaming PMU413 19-inch panel mount. These panel mounts accommodate up to three units. .
SPECIFICATIONS
OVERALL PERFORMANCE
FREQUENCY RESPONSE:
50 Hz to 10 kHz, ±1 dB
DISTORTION:
1% maximum THD
SIGNAL-TO-NOISE RATIO:
50 dB minimum
AUDIO PROCESSING:
SAP Channel: BTSC standard companding, dbx
Main Channel: 75 microsecond pre-emphasis (SAP-1)
AUDIO PROCESSING AGC:
Automatic Gain Control (AGC)
2:1 Compandor (dB), ±10 dB
SAP SUBCARRIER TEST LEVEL:
2.5 Vp-p (to produce ±25 kHz deviation of 4.5 MHz)
AUDIO BASEBAND INPUT
NOMINAL INPUT LEVEL (APL):
0 dBm, adjustable ±10 dB
AUDIO INPUT IMPEDANCE:
100 k-ohms, balanced
SAP OUTPUT
SAP SUBCARRIER FREQUENCY:
5H (78,670 Hz), locked to video sync
SAP SUBCARRIER OPERATING LEVEL:
1.5 Vp-p (to produce ±15 kHz deviation of 4.5 MHz)
SAP SUBCARRIER DEVIATION:
±10 kHz at 100% modulation
FRONT PANEL INDICATORS
AUDIO LEVEL:
Two Peak-reading 5-segment LED bargraphs
AGC ON LED
SAP CARRIER ON LED
FRONT PANEL CONTROLS
INPUT LEVEL (2)
INPUT SELECTOR SWITCH
SAP CARRIER LEVEL
SAP CARRIER ON/OFF-REMOTE/TEST SWITCH
AGC ON/OFF SELECTOR SWITCH
REAR PANEL CONNECTORS
Two 5-pin blocks, one 3-pin plug block
3-pin plug block:
Subcarrier Output
Ground
High
Low
5-pin plug block:
Remote A/B Select
Sync Input
Ground
18V Input(SAP-2) Output(SAP-1)
Remote SAP Enable
5-pin plug block:
Audio Inputs
Main and SAP (SAP-1)
A/B
Ground
Two F-type connectors; BNC optional:
Video Sync Loop In & Out (SAP-1)
POWER AND MECHANICAL
POWER:
SAP-1 105-125 V, 50-60 Hz, 5 VA
220 Option, 210-250 VAC, 50-60 Hz, 5 VA (factory set)
SAP-2 18 VDC @ 150 mA (from LEAMING MTS-2, MTS-4A, MTS-5)
SIZE:
1.6" H x 5.5" W x 18" D
Mounts on 1/3 of a PMU413 19" panel mount
WEIGHT:
3-1/2 lb. net, 6 lb. shipping
SAP DATA SHEET IN PDF 5.0
Specifications subject to change without notice.
LEAMING INDUSTRIES
Phone (800) 4-LEAMING
Copyright 2002, Leaming Industries
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