8525B/8528 Technical Service Manual General Information 1-5
Publication No: 15-02036 Issue 6
Desensitisation 10dB SINAD reduced to 7dB SINAD.
–1 and +4.4kHz ref SCF (USB)
62(55)dB.
±10kHz 85(80)dB.
±50kHz 100(95)dB.
Image Rejection Better than 90(80)dB
Spurious
Responses
Better than 90(70)dB.
Self generated signals >0.25µV PD;
6.6MHz, 9.998MHz, 13.2MHz,
19.8MHz, 26.4MHz.
Cross Modulation A signal 90(85)dB above a signal
producing 10dB SINAD, modulated 30%
and removed at least 20kHz from the
wanted signal will produce an increase in
receiver noise of less than 3dB.
Blocking As for desensitisation.
Intermodulation To produce a third order intermodulation
product equivalent to a wanted signal
producing 10dB SINAD, two unwanted
signals greater than 30kHz removed
from the wanted signal must have a level
greater than 85(80)dB above the wanted
signal. Third order intercept +10(7)dBm,
not affected by AGC.
AGC Less than 6dB variation in output level
for input variations between 1.5(2.5)µV
and 100mV PD. Fast attack, slow
release.
AF Response –1 typ(–3)dB 300 to 2800Hz.
AF Power and
Distortion
2.5W into 8 ohms: 5% THD
5W into 4 ohms: 5% THD
8W into 2 ohms: 5% THD
Clarifier Land: Nominal ±0.001%
Marine: ±180Hz
Clarifier is automatically reset to
mid-range with channel change.
Inband IMD Better than 25dB IMD with two 50mV
PD RF inputs.
Signal to noise vs
Input Level
5µV PD: 34dB S/N
50µV PD: 53dB S/N
500µV PD: 60dB S/N
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