WJ-8611 DIGITAL VHF/UHF RECEIVER
2-12 INSTALLATION
DIGITAL IF OUT (J3)
The Digital IF Output connector (J3) is a 15-pin subminiature-D type
connector that provides a serial interface for post-filtered baseband data in
quadrature-I/Q format. The physical signals are provided as differential-
TTL (RS-422/485), intended to drive 120-ohm terminated twisted pair
wire. The signals may be run single-ended (unterminated) for short
distances. For single-ended operation, it does not matter whether the
differential positive or negative sense is used.
Table 2-3
lists the signals
resident at each pin of this connector.
Table 2-3. Pin Assignments for the DIGITAL IF OUT Connector (J3)
Signal Pin
Description
Clock A
1
10 MHz Shift Clock (differential positive)
Clock B
9
10 MHz Shift Clock (differential negative)
Data A
3
Serial Data (differential positive)
Data B
11
Serial Data (differential negative)
Stb A
2
Start-of-Data Strobe (differential positive)
Stb B
10
Start-of-Data Strobe (differential negative)
I/Q* A
4
I or Q Data Indicator (1 = I, 0 = Q)
I/Q* B
12
I or Q Data Indicator (0 = I, 1 = Q)
5V 14
5V
power
+12V 7
+12V
power
-12V 15
-12V
power
GND 8
Ground
(power)
The data words are 16-bit, twos-complement integers. The words are
paired as complex data points, first I then Q. The complex I/Q pairs are
scaled so that full scale represents a signal 90 dB above the WJ-8611’s
noise floor. The total useful range is approximately 90 dB, as measured
from the noise floor to full scale. The absolute power level represented by
full scale varies with the selected bandwidth. This guarantees that signals
near the noise floor will be represented at any bandwidth. For signals
exceeding the full scale setting, the data will be invalid. Specifically, the
I/Q words’ numeric representation will “wrap” from positive full scale to
negative full scale.
The data rate of the complex I/Q pairs follows the data rates used by the
receiver for demodulation. These rates are:
IF BW
I/Q Pair Data Rate
200 Hz – 1 kHz
3.90625 ksps
3.2 kHz – 6.4 kHz
31.25000 ksps
8 kHz – 20 kHz
62.50000 ksps
30 kHz – 200 kHz
250.00000 ksps
ISB demod (6.4 kHz)
15.625000 ksps
Courtesy of http://BlackRadios.terryo.org
Summary of Contents for WJ-8611
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