Watkins Johnson WJ-8711A Technical Data Manual page 7

Gain Control Modes .............................................................. Manual, AGC Fast, Medium, Slow
AGC Range ....................................................................... 100 dB, min
AGC Threshold .................................................................. Approximately -108 dBm (0.9 mV) in 16-kHz BW
AGC Attack Time ................................................................ 5 msec, typical
AGC Decay Time ............................................................... Fast:
Selectable Front End Gain/Attenuation
Preamplifier Gain ................................................................ 10 dB (+2 dB)
Attenuation ......................................................................... 15 dB (+2 dB)
BFO
Tuning Range .................................................................... +8000 Hz
Tuning Resolution .............................................................. 10 Hz
First Image Rejection ............................................................ 90 dB, min
IF Rejection ........................................................................... 85 dB, min (>90 dB, typical)
LO Phase Noise .................................................................... -110 dBc at 1-kHz offset, typical
Reciprocal Mixing ................................................................. With a desired signal of 25 mV in the 3.2-kHz IFBW, the
Cross Modulation ................................................................. With a desired signal of 10 mV, an undesired signal 86-dB
Internal Spurious .................................................................. <-114 dBm referred to the RF input
Blocking ................................................................................ An unwanted signal 1 mV separated 20 kHz from a desired
Line Audio Outputs
Number of Outputs ............................................................. 2 center-tapped, balanced outputs
Output Level ...................................................................... 0 dBm, nominal into 600-ohm load
Connector Type .................................................................. Screw terminals
Speaker Output
Number of Outputs ............................................................. One output. For ISB mode, USB & LSB can be selected
Bandwidth .......................................................................... 100 Hz to 13 kHz
Output Level ...................................................................... Adjustable up to 1 W into 8-ohm load
Total Harmonic Distortion ................................................... <3% at 1 W
Connector Type .................................................................. Screw terminals
Headphone Output
Number of Outputs ............................................................. 2, unbalanced
Output Level ...................................................................... Adjustable up to 10 mW into 600-ohm load
Connector Type .................................................................. Standard 0.25-in (0.63 cm) stereo jack
Remote Control ..................................................................... RS-232 or CSMA; selectable by internal switch or front panel
RS-232 .............................................................................. Full duplex, 3-wire serial interface; rear-panel 25-pin female
Baud Rates (Both Interfaces) .............................................. 75, 150, 300, 600, 1200, 2400, 4800 & 9600; selectable by
Approximately -125 dBm (0.12 mV) in 300-Hz BW
(Threshold matched with IFBW, typically 10 dB above
noise floor)
10 to 100 msec, variable
Medium: 100 msec to 1 second, variable
Slow: 1 to 5 seconds, variable
desired signal-to-noise ratio (SNR) is >20 dB, when an
undesired signal 70-dB higher in amplitude and 35-kHz
removed in frequency is present.
higher, 30% AM modulated produces <10% cross modulation
for frequency separation of >50 kHz in the 1-kHz IFBW.
signal of 1 mV will not cause the IF output to fall by more than
3 dB.
ISB mode, USB & LSB on separate outputs
All other modes, audio signal common to both outputs
individually or combined. (Internal speaker optional).
ISB mode: 1 output contains USB (left channel), 1 output
contains LSB (right channel)
All other modes, audio signal common to both outputs
entry
D-shell connector
internal switches or front panel entry
7
WJ-8711A