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TRANSCRIPT
RD-FI43 575 RADIO FREQUENCY DISTRIBUTION RSSEIIBLY(U) SPERRY i/1'iGYROSCOPE CLEARWATER FL K M CULLEY 1984N00014-82-C-214
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' TECHNICAL REPORT,4
RADIO
F REQUENCY
D ISTRIBUTION
Lu1 AA SSEMBL Y
CONTRACT NO. NOO 1 4-82-C-2147
+SPEM .,,
PREPARED BY: JUL 2 7
j KENNETH M. CULLEY
5 84 07 25 080/': " ;~- '',;V '"-,," '' .V,'- ° , .V -,.,. "-*-." -""" -"'' - .' ,- -,--.- -" -
U--
TECHNICAL REPORT
S RADIO
F REQUENCY
D ISTRIBUTION
A SSEMBLY,
CONTRACT NO. NOOO 14-82-C-2 147
4ll SPEraVtll
PREPARED BY:
4 KENNETH M. CULLEY
-d-
TABLE OF CONTENTS
SECTION/ TI TLE PAGE
PARAGRAPH
1.0 INTRODUCTION
2.0 RFDA MAINFRAME CHASSIS 3
2.1 DIRECTION OF ARRIVAL (DOA) 3
CHANNELS
2.2 POWER COMBINERS 6
2.3 BIT ASSEMBLY 6
2.4 DC VOLTAGE DISTRIBUTION 6
3.0 LAMBDA POWER SUPPLY ASSEMBLY 6
4.0 FAT DATA 9
4.1 DISTRIBUTION GRAPHS 11
4.2 SYSTEM RESPONSE TIME 23
4.3 HARMONICS AND SPURS 23
4.4 OUT-OF-SPEC PRINT OUT ". 24
I
. 1.0 INTRODUCTION
The Naval Research Laboratory (NRL) Radio Frequency Distribution
Assembly (RFDA) is an interface between the Sperry four-channel, fast-
switching synthesizer and the EF-111 jamming system antenna ports.
The RFDA is a sophisticated, high-speed RF interface designed to
convert the banded outputs of the four-channel synthesizer (16 ports)
"4 to 36 ports which represent six ordinal directions of arrival (DOA)
for the EF-111 jamming system. The RFDA will distribute the RF
signals while providing controlled RF amplitudes to simulate the
antenna patterns of the EF-111 Electronic Warfare (EW) system. The
simulation of the arrival angles which appear between the ordinal
directions is performed by controlling the amplitude of the RF signal
from the DOA channels. The RFDA is capable of operating over the
frequency range of 500MHz to 18GHz, and can rapidly switch between
-4 varying frequencies and attenuation levels. c
The RFDA unit consists of five DOA channels. Input to four of these
channels comes from the banded output of the frequency synthesizer;
the fifth channel is for external input. The output of the RFDA unit
is taken from six power combiner subassemblies. These six outputs
represent the ordinal directions of the system (30° , 90 0, 1500, 2100,
2700, 3300) and are a summation of all five DOA channels and a
separate noise input.
The RFDA is composed of two major items:
0 RFDA Mainframe Chassis
0 LAMBDA Power Supply Assembly
Figure 1 is an overall system block diagram of the RFDA indicating the
major subassemiblies.
'PI
,.-1
U. .CI- V)0
.................................... c.
CC >w z ;r -0 oI
0 2 0 a C 0a. 0 C 0m
-L -L CLL L1I a -
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c. 0
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" 2.0 RFDA Mainframe Chassis
The RFDA Mainframe Chassis consists of the following:
o DOA Channels (5)
o Power Combiners (6)
0 BIT Assembly
0 DC Voltage Distribution
A discussion of each of these areas follows:
2.1 DIRECTION OF ARRIVAL (DOA) CHANNELS
Contained within the MAINFRAME CHASSIS ASSEMBLY are five identical DOA
channels. Four of these channels are driven from the NRL frequency
synthesizer delivered under contract N00173-80-C-0519. The fifth
channel is driven from external frequency sources. The RF input is
divided into four bands:
0 Band 1 0.5 - 2.047875GHz
0 Band 2 2.048 - 8.191875GHz
" Band 3 8.912 - 13.311875GHzo Band 4 13.312 - 18.000 GHz
Each of these bands (except .5 and 18) is extended by 250MHz by FM
NZ modulation.
Three amplifier bands are formed by bands 1 and 2 and the combination
of bands 3 and 4.
Following the amplifiers is a switched bandpass filter bank. Each
filter is less than an octave wide with at least 40 dB of stopband
attenuation.' This, coupled with 60 dB of isolation from the switches,
allows the maintenance of -40 dBc spurious and harmonic signals.
-3-
The output of the filter bank is fed to a pair of three-way power
dividers which are followed by six programmable attenuators. Three of
the attenuators cover the band from 0.5 to 8.5 GHz and the other three
cover 7.5 to 18 GHz. Each attenuator is capable of 40 dB of
attenuation above insertion loss with with a minimum programmable step
size of 1dB. It is the combination of these six attenuators and the
following switches which performs the function of simulating the
different angles of arrival and antenna patterns.
The outputs of the programmable attenuators are fed to the inputs of
the output transfer switches. Each switch has an input from a low
band and a high band attenuator. Each switch also has two outputs
which are separated by 1800, i.e., the switch that controls 301 also
controls 2100.
Six directions, 300, 900, 1500, 2100, 2700, and 3300, are output from
each channel.
Each DOA channel is independently controllable from the Advanced
Tactical Electronic Warfare Equipment Simulator, (ATEWES) Digital
Generator Unit (DGU). The interface between the DGU and each channel
is four digital logic cards. Three of the cards control the six
programmable attenuators, one high-band and one low-band attenuator
per card. Inputs to this card are frequency, desired attenuation, and
DOA. Outputs to the attenuators are a corrected attenuation command.
The fourth card is the input/output control board. This card controls
the filter bank switches, the output transfer switches and system
timing. Inputs are frequency and DOA. Outputs are frequency to the
attenuator boards, switch control signals, and timing signals.
Figure 2 is j block diagram of a single DOA channel. There are five
identical channels within the RFDA Mainframe.
-4-
Dm{,,-:? - :., .- --. ..- ..".'. -.--.. --." , . ....,-.-. .,-,--- -. ,,- .,,, .-, ... -, . .-. . - -. .
U
I
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* --
N N N
-5-
ZI
2.2 POWER COMBINER
The six outputs of each DOA channel are incorporated into six
directions of arrival in the power combiners. For example, the 300
outputs of the six DOA channels are combined in a single power
combiner. Figure 3 shows the Block Diagram of a power combiner. The
four inputs from the synthesizer-fed DOA channels are combined in a
single four-way divider. The input from the fifth DOA channel and an
external noise input are mixed in a two-way divider. A four-port
directional coupler is used to combine the power divider outputs into
a single output and also allow a sample port for the BIT Output.
., 2.3 BIT ASSEMBLY
A Built-In-Test (BIT) output is provided for system monitoring. An RF
sample is available from each power combiner as an attenuated specimen
of its output signal. The six BIT outputs are brought together at a
single-pole, six-throw coaxial switch. This allows the operator to
choose which output to monitor. The BIT output is on the front panel
of the mainframe chassis.
2.4 DC VOLTAGE DISTRIBUTION
Distribution of DC voltages used within each DOA channel is from eight
terminal strips located within the RFDA mainframe chassis. Each DOA
channel contains two terminal strips which feed the appropriate DC
voltages to the components within that channel.
3.0 LAMBDA POWER SUPPLY ASSEMBLY
The RFDA requires a number of different DC voltages to operate. These
voltages are furnished from a separate power supply assembly
; Ir consisting -of four Radio-Electronic-Television Manufacture'sAssociation (RETMA) rack mounted drawers. These four drawers provide
-6-
r -
0
LU.
09-
z I C
I IiN I -m
COC
I1 2 1 I v
x x I M~
0. 0o 01 0
U. 1. L6 U
'4 0
--- S- - - - - - - -- -ILI7L .
the necessary voltages to operate the RFDA and digital logic cards.
,* Two of the drawers are used by the RF components (and the BIT switch)
and the other two drawers supply the logic boards.
These power supplies are Lambda LN series, commercial quality, meeting
many of the MIL specifications for temperature, shock, humidity, and% vibration. Remote sensing is used to eliminate the effect of power
output lead resistance on DC regulation. External overload protection
-. automatically limits the output current to a preset value, thereby
providing protection for the load and power supply. An overvoltage
-2' protection module crowbars the output when trip level is exceeded.
The power supply drawers are subdivided as follows:
POWER SUPPLY DRAWER I POWER SUPPLY DRA'
RF DRAWER 1 LOGIC DRAWER 2
LAMBDA NUMBER 16714-2 LAMBDA NUMBER V( 3-2
+18V (5 ea) ±15V (1 ea)
-5.2V (1 ea)
-2V (5 ea)
+5V (1 ea)
POWER SUPPLY DRAWER 4 POWER SUPPLY DRAWER 3
RF DRAWER 2 LOGIC DRAWER 1
LAMBDA NUMBER 16726-3 LAMBDA NUMBER 16727-2
±15V (1 ea) ±5V (4 ea)
± 5V (1 ea)
+28V (1 ea)
-8-
4.0 FAT DATA
I . The data contained in this section is the Factory Acceptance Test data taken on
DOA channels 1,2,3, and 4 in November 1983.
'. The Factory Acceptance Test (FAT) requirements for the DOA channels were to
measure the power output at 55 specific frequencies within the 500MHz to 18GHz
, range, then attenuate these signals by OdB to -31dB, and compare the output
power to the required output power. These measured outputs were specified to be
* within ±2dB of the required output power. Over the 10,560 measurements per
channel (55 frequencies x 32dB attenuation range x 6 output ports) the
specification was met over 99.6% of the cases.
4.1 DISTRIBUTION GRAPHS
-: The following table is a breakdown of what the distribution graphs show us:
n CHANNEL 1
" OUTPUT ±ldB(%) ±2dB(%) MAX ERROR (dB) FIGURE NUMBER
300 98 100 1.52 4.1
900 98 100 1.54 4.2
1500 98 100 1.37 4.3
2100 95 100 1.66 4.4
2700 95 99.83 2.02 4.5
3300 94 99.94 2.06 4.6
CHANNEL 2
• OUTPUT ±ldB(%) ±2dB(%) MAX ERROR (dB) FIGURE NUMBER300 96 100 1.85 4.7
900 93 99.94 2.02 4.8
1500 88 99.94 2.10 4.9
2100 92 99.37 2.33 4.10
2700 94 100 1.81 4.11
3300 88 99.86 2.55 4.12
-9--I.. , . - , . . ';' . r, - : . v : , . ,,: ,.,. - . ,. . :. . . . - . . ' - " ' -i .'.
•. CHANNEL 3
" OUTPUT ±ldB(%) ±2dB(%) MAX ERROR (dB) FIGURE NUMBER
300 92 99.77 3.00 4.13
900 98 100 1.99 4.14
1500 95 99.94 2.22 4.15
2100 94 99.72 2.95 4.16
2700 95 99.94 2.06 4.17
3300 90 99.83 2.23 4.18
CHANNEL 4
-" OUTPUT ±ldB(%) ±2dB(%) MAX ERROR (dB) FIGURE NUMBER
300 88 99.03 2.31 4.19
900 94 99.72 2.56 4.20
1500 89 97.61 2.57 4.21
2100 82 96.42 2.44 4.22
2700 90 99.43 2.39 4.23
3300 98 100 1.54 4.24
.10
2-10
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FIG. 4.1
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FIG 4.
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-, . I bo 2. mg bra 4 ii 5 0" ",mn x 1e-'1 fin: 0.37
Hj/R803 Rb3oiute Diff-Lrence frrm Cw.'ca. et n Sd:- 0. 210:2p:44.4703 Probability Distribution of Rbaolute Accuracy Mx: 1.3?
FIG. 4.3
:, ... ,
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Q 4 - - 4 -- FIG._4.6
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dora x 100 M' . 3. 8
1'/e3 Rbsolule Dif fercni'it f ronm C w(r . Ai,.ten rd. 14.Jl16:33:255.2958l Probability Distribution of Rbsolute Accuracy Mx: .95
FIG. 4.7
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40
0) 0 4 --
2--~ d8m x 116,11 Mn: C14i1lO'3Rbsolute Diffrrence frc,,. (r-r'. fl-.-n . E1.34
14014.250-4 Probability Distribiution of Rbsoluto' Accuracy Mx: 2.02
FIG. 4.8
7-- ---
-- - - _ _ -- - - - - . - -- - - - - - - -
CF 0
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d~li x @-HMn: 03. j219:9:2.9E03 r-babili*.y striIbution pf Rbsolut.e Rccut-acvy x 2.18
FIG. 4.9
LTj A.- 4 - _ _ __ _
a
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4%b
bnd m x 0 0M
:01
I4 "t ifrnt im C i 1 ,en cy S .03
X3:135.2203 Promitty stribution ot AbsOute Rcuc Hy
FIG. 4.10
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e0 - -, . - A------ - ----- .-- -- 1.:. I
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Rb,,. t Dif.ference f'ror... ;.... ' ' te 5d• 0 3
FIG. 4.11
0. - - - - - . - - -!i
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to00
m- 0 ap_
d l x 1- r~d. 0.521:4=t. b~oi ute Di ffer.rin from C :o. r 5dte0.n
1 1,3 90 Prob bt ity Distribut'ion o e RbsolutepRco"urcy Hx:. 2.55
FIG. 4.12
o*,--16-
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FIG 4.13
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dBin x 10-"H in: 0 34I '8j Rsute,)Uaff'-rerc frovu Cmet. Fittri ,d; 0.3'
44.523 Prob:bi it~y Dietribution D Absoluto Accuracy Mx: 1.49
* FIG. 4.13
L 17
to-
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C W *. 4- * _ _ ! : " - I
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I -/ __ - . - - - - : - - - ----
LU
, . _ _ _ _ _ _ _ _ _ _ _ _ _ _ ...
4,. F_ _._ _4._6
U go
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1''3Rbso Iute Diff rence Frore Cmnir. F9htn c-d 0.33q 1U4/:144.2903 Probability Distribution of Rbsoluto Rocuracy 14x: 2.22
FIG. 4.15
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** .l FIG. 417
Jil_'-
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11/8/- ____eDffrrn- ru m .Ftr ~ .03
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I CL
~FIG. 4 -1
0o
....
? _ _... .... ___.__ _ _
0 1. bo 260 . o .
d~li x 101-0 0-n .52I/ 3Rbrolut.r Di f fetrence- frnm Cmind. A+t tn 5d; 0.4510:5:23690 Probabil1i ty Distribution of.elt ouay H :23
CL
,_,__5 ___ _
. .G. .2
4-
20
%
9 ~~ ~~. _________
r-7
-0. ag .bo4
*d 9m.tD x I Ek - Mn 0. -4 2.- - .-
4,/B.g U)s I- _______ Difee ce rm m . _tr 03
020
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0.~__ _
1.2 Q
11/813 Abo~utr d~wiMn: I3.50
H olt!Diffrmnicr frOU rZWrL'. Oftff Ci.. O.'4EI11:0:16.420 3 Probability Distribution of Rbsoltite Rccuracy Mx: 2.5?
FIG. 4.2f
c _
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4.-i- __ __ _
W 0
d* Off EP- Mn 0.J Ei .-4-
1. &~~F2. 4.22 9~
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• ". FIG.__4_ _ _ _
ii '-4 _ __/_ _ __.: i _ _ -_ _ _ _
cu
4.' 2 . 2 ., 00 , ,d bin x 1 Mn: 0.51
1Rbzoutr Diffrencr from Cn d 1. Itn t 0. i911:9:29.090 3 Probability Distribution of RE-go ILAO 'Rocuracy Mx,: 2.39
FIG. 4.23
. - -4-.---,..-4- ----- - ------- _
... _ , - 4 -*' -::
* "..,,
r -co
4.
U CU
l <">, I*- *
*3 0--_ _
M' 0
d~m x 10'0 Mn: 0.3FI/ / ] Hbsolute Diff-rp-.n,-- 'rro,,i f..nr-i. I'l11, en -Sd ki. I-,:)1:734.5.102 Probability Distribution of IRbolijte Rr;curacy Ix" 1.54
FIG. 4.24
-22-
-.
4.2 SYSTEM RESPONSE TIME
By following the procedure specified in RFDA FACTORY ACCEPTANCE TEST, Section
3.2.1.4, the switching speed of all switches can be tested. The specification
for maximum system response time is 250 nsec.
- n 4
The maximum response time of each channel is indicated below:
". CHANNEL MAXIMUM RESPONSE TIME
1 170 nsec
2 160 nsec
3 I0 nsec
4 200 nsec
-' 4.3 HARMONICS AND SPURS
The generatio'i of harmonics and spurs is controlled to a level no greater than
40dB below the fundamental signal level over the entire frequency range of eachch&nnel
This is accomplished b) the ten (10) band pass filters and transfer switch 5.
"- The results are listed below:
.', CHANNEL HIGHEST HARMONIC/SPUR LEVEL
-":, 1 -42
2 -49
3' - -47
4 -47
%-.23
,', '' , '' "" '""" - . . . - '-"" -"" . . . , , , . " . --- . . - , ,'. . . - .. . . ,, , ," -.. . . .. .- .. .
-.4. ' : ' , ' ? ' - "
"" ' " " " ," " ,* - " ' - : ' , ", , " ,'. ". ".","d ;
o - -o"..
4.4 OUT-OF-SPEC PRINTOUT
- 4 ,The following table is in explanation of t out-of- )ec printout.
, .CHANNEL 1
OUTPUT NUMBER OF ERRORS MA) ERROR(dB % OUT OF SPEC.
300 0 NONE 0900 0 NONE 0
1500 0 NONE 0
2100 0 NONE 0
- 2700 3 0.20 .17
3300 1 0.06 .06
CHANNEL 2
30o 0 NONE 0
90o 1 0.02 .06
* 1500 1 0.10 .06
2100 11 0.33 .63
2700 0 NONE 0
3300 20 0.55 1.14
CHANNEL 3
300 4 1.00 .23
900 0 NONE 0
1500 1 0.22 .06
2100 5 0.95 .28
2700 1 0.06 .063300 3 0.23 .17
'4
-24-
• oV. . . . ..4 , . * . , . *. :*.,~. x--. . .
CHANNEL 4
300 17 0.31 .97
900 5 0.56 .28
1500 42 0.57 2.39
2100 63 0.44 3.58
2700 10 0.39 .57
- 3300 0 NONE 0
NOTE: Every one of the 24 outputs reported above is at least 99% within spec
- except for channel 4 output 1500 and 2100 which are 87.6% and 96.4%
respectively.
By analyzing the out-of-spec printout further, we can see in the 1500
S",output there are 42 errors, the maximum of which is 2.57dB (only 0.57dB
out-of-spec).
SOf these 42 errors 26 are at 9984 MHz, the remaining 16 are at 3712 and3717 MHz. This indicates that the attenuators used for this output has
.5dB holes in them at these frequencies.
Of the 63 errors in the 2100 output the maximum error is 2.44dB (only
0.44dB out of spec). Twenty-five (25) errors are at 767 and 768MHz, and
22 errors are at 10496 MHz. Indicating, once again, 5dB holes in the
attenuators used for this output at these frequencies.
NJ
.
-25-
",4. .0"'' ' -" "-' ' "2 -.-.'''' .-. '''" .'' ',-..-' .'" " "- '
k • .. - . ., _ , . ., . . . . : . . : . . , . : ... . , _ i _ . . , •
FT Out- C -, o -"'pec l.cC at in rs rcfer n,- 1 . I 17 .6f- IT /1/1i• -,h 1 [U : )70 Fr~-'. 1561 04-n 0 ,Ch: 1 W IA' ;70 FIeq: 15616 t ... Pi. - 4.20 DI ff -2 20(h: I DU :270 Free: 15616 A tn 29 Pur 01 D f -2.01Ch: 1 D UI-: 330 Fre,:: 204,? Atr 6 PLi r: 5.56 DIff -2 .06"h-'h !,IA: 90 Frpq: 1766 1i Atr, 29 P'or - '7 L,., IF. .02Ch: 2 K'JA: 150 Frecq: 8192 Atn I ' P,.-r - 1 . 1 [Jtf f 2. IUCh 2 L2JOW 10 Freq: If 000 (.)i 10 (.1P,. _76 DIf1 : -22
-" Ch: 2 DOW i 0 Freq: 18000 At 1I Fnur -3.75 Dif: 25Ch: 2 11: :10 Freq: 18000 Atn 13 P.,y r '2 .57 Di f - 07Ch: 2 DOA: 210 Fre: 18000 t n 14 P,,r: -22.76 L)f: -f '6
Ch: 2 D00: 210 Freq: 18000 Atn 15 Pur' -27.83 D f : -.
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