1-6 General Information 8525B/8528 Technical Service Manual
Issue 6 Publication No: 15-02036
1.2.3 Transmitter
Power Output
Land
100W PEP at 2MHz falling linearly with
frequency to 90W PEP at 24MHz ±0.5dB.
Marine 125W PEP at 2MHz falling linearly with
frequency to 90W PEP at 24MHz ±1dB.
CW or single tone: approximately 60%
of PEP with average PEP control.
Duty Cycle 100% normal speech over full
temperature range.
100% ARQ up to 30°C.
25% continuous data mode (5 minutes
on maximum) at ambient temperature up
to
30°C.
100% all modes up to maximum ambient
of 45°C with Option F.
Supply Current Output power 100/125W
2-tone or CW: 9 to 12A
Average speech: 6A for battery life
calculations.
Protection Safe under all load conditions by limiting
reflected power to 6W and limiting PA
transistor collector voltage swing.
Thermal protection against excessive
heatsink temperature.
AF Response Overall response of microphone and
transmitter rises approximately
6dB/octave 300 – 2800Hz.
Electrical input −6(−8)dB,
300 – 2800Hz.
Ripple 1.5(3)dB pp, 500 – 2500Hz.
Spurious &
Harmonic
Emissions
Better than 60(48)dB below PEP.
Carrier
Suppression
60(50)dB below PEP.
Unwanted
Sideband
50(45)dB below PEP (400Hz)
70(65)dB below PEP (1kHz)
Intermodulation
Distortion 2-tone
Test
100W: 32(26)dB below each tone
38(32)dB below PEP
125W: 30(26)dB below each tone
36(32)dB below PEP
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