WJ-8611 DIGITAL VHF/UHF RECEIVER
INSTALLATION 2-13
Note that the above rates are for I/Q pairs, and not the individual data word
strobe rate. There are two data words for each I/Q pair.
Figure 2-5
illustrates the timing for transfer of individual I and Q data words. The
positive phase of the differential signals is shown. The data and control
signals change on the negative edge of the clock which places the clock
rising edge at mid-bit of the data. Note that the strobe occurs one cycle
before the data word starts. The 10 MHz clock signal is always present.
20 CLOCK CYCLES
16 CLOCK CYCLE FOR DATA
I WORD
I/Q*
DATA
STB
10 MHz CLOCK
20 CLOCK CYCLES (2
µ
s)
D15
D14
D13. . .
D1
D0
4 'empty' CLOCK CYCLES
D15
D14. . .
Q WORD
98-0327
Figure 2-5. Timing Diagram for I/Q Data Transfers at the DIGITAL IF OUT Connector
Figure 2-6
illustrates two examples of the strobe over a longer period of
time (several I/Q pair transfers). The first line shows the strobe at the
250 ksps pair rate (2
µ
s period) used for bandwidths 30 kHz and greater.
The second line shows the strobe for the 62.5 ksps pair rate (16
µ
s period).
Note that the strobes for a single I/Q pair are always 20 clocks or 2
µ
s
apart. For the 250 ksps I/Q pair rate example, the strobe appears to have a
500 kHz rate because of the 2:1 ratio between the I/Q pair period
(1/250 ksps = 4
µ
s) and the 2
µ
s between I and Q strobes. For the lower
data rates, there is a gap between the I/Q pairs as shown in 62.5 ksps pair
rate example. The lower data rates are similar to the 62.5 ksps case, with
periods equal to the inverse of the specific rate.
Courtesy of http://BlackRadios.terryo.org
Summary of Contents for WJ-8611
Page 3: ...A B blank Courtesy of http BlackRadios terryo org...
Page 4: ...THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 19: ...1 i SECTION 1 GENERAL DESCRIPTION Courtesy of http BlackRadios terryo org...
Page 20: ...1 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 29: ...2 i SECTION 2 INSTALLATION Courtesy of http BlackRadios terryo org...
Page 30: ...2 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 47: ...3 i SECTION 3 LOCAL OPERATION Courtesy of http BlackRadios terryo org...
Page 48: ...3 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 85: ...4 i SECTION 4 REMOTE CONTROL Courtesy of http BlackRadios terryo org...
Page 86: ...4 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 119: ...5 i SECTION 5 CIRCUIT DESCRIPTIONS Courtesy of http BlackRadios terryo org...
Page 120: ...5 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 143: ...6 i SECTION 6 MAINTENANCE Courtesy of http BlackRadios terryo org...
Page 144: ...6 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 167: ...7 i SECTION 7 REPLACEMENT PARTS LIST Courtesy of http BlackRadios terryo org...
Page 168: ...7 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 243: ...A i APPENDIX A 8611 SM SIGNAL MONITOR OPTION Courtesy of http BlackRadios terryo org...
Page 244: ...A ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 267: ...FP i FOLDOUTS Courtesy of http BlackRadios terryo org...
Page 268: ...FP ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 298: ...Courtesy of http BlackRadios terryo org...
