DTC Communications Inc. DSS950TX Benutzerhandbuch
OP1920052 REV B DTC COMMUNICATIONS INC 11/23/1999
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Description
The DSS-950TX is a 900 MHz, low power, spread spectrum audio surveillance transmitter used
for law enforcement applications. The transmitter employs digital modulation with direct sequence
spread spectrum on one of three factory-selected channels in the 902-928 MHz range.
for law enforcement applications. The transmitter employs digital modulation with direct sequence
spread spectrum on one of three factory-selected channels in the 902-928 MHz range.
The DSS-950TX has a power output of 500mW to an integral patch antenna built into the
housing, which meets the technical and safety requirements of FCC Part 15.203. This device is
compatible with the DTC Communications DSS-900-KT Audio Surveillance System. Range will
be approximately 2 to 3 times that of a 50 mW unit.
housing, which meets the technical and safety requirements of FCC Part 15.203. This device is
compatible with the DTC Communications DSS-900-KT Audio Surveillance System. Range will
be approximately 2 to 3 times that of a 50 mW unit.
Two microphone modes are supported, internal and external. The microphone audio is processed
by an amplifier equipped with an automatic gain control (AGC) which may be turned ON or OFF
with an external switch. Microphone audio is secure; processed digitally with a continuously
variable slope delta-modulation (CVSD) speech coder at a rate of 32 kbps.
by an amplifier equipped with an automatic gain control (AGC) which may be turned ON or OFF
with an external switch. Microphone audio is secure; processed digitally with a continuously
variable slope delta-modulation (CVSD) speech coder at a rate of 32 kbps.
The DSS-950TX is a portable device; DC powered by three AA batteries, which supply a nominal
4.5 VDC. A step-up switcher is employed, which maintains the full half-Watt of output power over
the entire life of the batteries. Alkaline batteries will provide more than two hours of operating life
and Lithium-Ion AA’s will provide more than four hours.
4.5 VDC. A step-up switcher is employed, which maintains the full half-Watt of output power over
the entire life of the batteries. Alkaline batteries will provide more than two hours of operating life
and Lithium-Ion AA’s will provide more than four hours.
The DSS-950-M is a flying lead module based on the same device, but is made roughly half the
size. This module operates from an external 10 – 32 VDC via stripped and tinned leads and is
designed for use with larger battery packs and vehicular power. The antenna is also integral to
this unit.
size. This module operates from an external 10 – 32 VDC via stripped and tinned leads and is
designed for use with larger battery packs and vehicular power. The antenna is also integral to
this unit.
Using the Transmitter
Keep in mind that the TX patch antenna must be facing away from the agent’s body to work
properly. The patch antenna is housed under a black plastic-like cover at the top of the unit.
There is no external antenna on this unit. This is a high current drain device (500 mA); always
replace the batteries before using the unit.
properly. The patch antenna is housed under a black plastic-like cover at the top of the unit.
There is no external antenna on this unit. This is a high current drain device (500 mA); always
replace the batteries before using the unit.
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He internal top-fire mike is located between the two slide switches. It is active unless an
external mike is plugged into the locking subminiature connector. Two microphones are
supplied with the DSS-9500; they differ only in cable length and color. External microphones
may be extended up to 100 feet from the transmitter.
external mike is plugged into the locking subminiature connector. Two microphones are
supplied with the DSS-9500; they differ only in cable length and color. External microphones
may be extended up to 100 feet from the transmitter.
Power
Off On
Off On
AGC
Off On
Off On
Internal
Microphone
Microphone
External
Microphone
Microphone
ANTEN NA SIDE (AW AY F ROM BODY)
Figure 1 TX Control Panel