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The BST-75
mini base station transmitter meets the highest professional standards
while offering outstanding value and the most advanced technology available.
This versatile and innovative transmitter is simple to use, yet it has
sophisticated features such as "Flash Memory" 98-channel programmability
with synthesized manual 10-channel selectable user-switch. Plus a unique
multifunction RF indicator detects bad antenna load, RF presence, coaxial
cable short or open condition for quick and easy troubleshooting.
The compact
design of this transmitter is ideal for multiple transmitter installations.
Up to four transmitters can be installed in one rack space. Also, it operates
in the 72-76 MHz band under FCC Regulation Part 90. This allows a greater
RF power capability (120 mW) for greater range and reliability than customary
FCC Part 15 systems.
The audio
processing circuit produces full fidelity frequency response from 80 Hz
to 10 kHz with very low residual FM noise and distortion. To accommodate
a greater variety of receivers, the BST-75 can operate with non-companded
receivers or with companded receivers for higher fidelity sound reproduction
with a signal-to-noise ratio of up to 100 dB.
All this
is designed into a stylish, compact, all-metal enclosure suitable for
permanent rack-mount installations or for stand-alone portable applications.
BST-75
Specifications:
| Audio
Inputs: |
- Line level balanced input 0 dBm for 80% modulation (+20 dBm
max).
- Electret mic unbalanced input -25 dBm at 5 k for 80% modulation.
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| Connectors: |
- XLR-3F Combo with 1/4" phone jack.
- Barrel type 5.5mm x 2.1mm power jack AC or DC.
- BNC for RF output and flash programming.
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| Operation
Indicators: |
- LED
bargraph VU meter.
- LED
antenna load and coaxial cable condition indicator.
- LED
DC power indicator.
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| LED
RF Antenna Load Indicator: |
- Steady
on = normal RF power.
- Blinking
on/off = bad antenna or coax cable.
- On
with steady bright pulsing = no RF power.
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| Antenna: |
- 19" Telescopic antenna mounts directly into top of transmitter
for table top use.
- BNC RF output connector for optional external antenna.
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| FCC
Compliance: |
Type
Accepted under FCC Part 90. |
| Power
Requirements: |
12 Volts
AC or DC, 200 mA max. |
| Frequency
Response: |
80 Mz
to 10 kHz. |
| Audio
Distortion: |
Less
than 0.5% at 80% modulation. |
| Modulation
Limiter: |
Peak
compressor type with high linear overload protection (25 dB). Attack
time less than 1 ms, recovery time 10 ms. |
| Audio
Processing: |
Companded
and non-companded to accommodate a variety of receivers. |
| Audio
Gain Control: |
Limited
to 20 dB. |
| Frequency
Modulation: |
10 kHz
deviation for narrow-band companded. |
| RF
Output Power: |
Maximum
power output for FCC Part 90 (120 mW). |
| Frequency
Stability: |
Better
than 0.002% digitally synthesized, crystal controlled. |
| Operating
Frequency: |
72.020
to 75.980 MHz (98 channels). |
| Harmonic
and Spurious Emissions: |
Better
than 50 dB below carrier. |
| Dimensions: |
3 3/4"
x 1 5/8" x 5 1/4" deep. |
| Weight: |
15 1/4
oz. |
NOTE:
Specifications subject to change without notice.
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