Operations and Maintenance Manual

70-STR1800-00 Rev K STR-1800 O&M Manual
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Operating Power
13.6 VDC  15% (current @ 13.6 V: transmit 9 A, receive 0.7 A)
Operator
Adjustments
None
Reliability
25,000 hr MBTF
Antenna Connector
UHF PL-259 type female located on rear panel
Audio Interface and
Control Connector
DB-25 socket on front panel including 4 channel select lines, audio in/out, push-
to-talk. Does not apply to STR-1821 radios.
Separate DB-9 socket for diagnostic and programming interface.
Power Connector
Tyco/AMP Electronics P/N 172129-1 (female housing with male contact pins)
Transmit Channel
All models: Single
Receive Channel
STR-1820, STR-1820A, STR-1830, STR-1835, STR-1840: Single receive channel
STR-1821, STR-1821A: Two independently programmable receive channels
Channel Spacing
UHF (FCC/IC): Selectable to either 12.5 KHz or 6.25 KHz channel spacing
UHF (Brazil): Selectable to either 25 KHz, 12.5 KHz, or 6.25 kHz channel spacing
UHF (CE) versions include 20 KHz channel spacing selection
VHF: Selectable to either 25 KHz or 12.5 KHz channel spacing.
RF Output Power
Selectable as 3 factory set discrete power levels from 0 and 30 watts (STR-1820,
STR-1820A, STR-1821, STR-1821A) or 25 Watts (Other Models), (2%) into a
VSWR of 2:1 or better.
Output Impedance
50 ohms, nominal
Output Protection
Operating into a 10:1 VSWR of any phase angle without damage
Modulation
FM with a rated deviation of ±5 KHz (STR-1820, STR-1820A, STR-1821, STR-
1821A) or ±4 KHz (STR-1830, STR-1835, STR-1840) for 25 KHz spacing (Brazil
use only) and ±2.5 KHz for 12.5 KHz spacing. Typical operation at 60% rated
deviation (±3 kHz/±1.5 kHz).
Modulation
Sensitivity
Radio achieves 60% (+/- 5%) of rated system deviation is for a 1 KHz input tone
between 40mV RMS and 1V RMS.
Turn-On Time
Within 20 msec (UHF models) or 40 msec (VHF model) of application of the
keying signal, the transceiver reaches 90% of programmed output power and is
capable of transmitting an on frequency signal.
Spurious and
Harmonic Output
-70 dB below rated power
Audio Input
Impedance
1200 Ohm 20%
Does not apply to STR-1821 radios.
Transmit Audio
Frequency
Response
Flat response over the 300-3000 Hz range with no pre-emphasis.
Does not apply to STR-1821 radios.
Minimum Duty Cycle
25% transmit duty cycle continuous. Capable of 15 s continuous keying
Output S/N Ratio
30 dB minimum fully modulated
Spurious Leakage
-57 dBm maximum
Selectivity
70 dB minimum for 25 KHz channel spacing and 65 dB min. for 12.5 KHz spacing