Radar System Engineering

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722 RADAR RELAY [SEC. 17.13 relay links is a 100-Mc/sec frequency-modulated system. The equipment operates at four frequencies between 78 and 116 Me/see, channelchanging being accomplished in the receiver by a coil-switching mechanism and in the transmitter by plug-in coils. A block diagram is given in Fig. 17.18. The input signals are amplified and delivered push-pull to the deviator by a phase splitter. The deviator acts as a reactance tube, modulating an oscillator which operates at one-eighth the desired carrier frequency. Three stages of frequency-doubling and power amplification Signals Video amplifier Phase splitter Push.pull deviator Doubler 25 Me/see Doubler 12.5 Me/see Push.pull oscillator t t Y and doubler Detector Power monitor I Transmitter Discriminator Signal monitor I R.f amplifier Mixer If amplifier 1 Discriminator > Video amplifier Signals Receiver FIG. 17.1 S.—100-Mc/sec frequency-modulated equipment. follow. The final stage consists of a pair of 4E27 tubes operated as a Class C amplifier with an average r-f output power of about 100 watts. The equipment is designed to accommodate a maximum video bandwidth of 2 Me/see. The oscillator gives a maximum linear frequency deviation of 0.5 Me/see. Thereforej in this and the first doubler stage the bandwidth need be only the 2 Me/see determined by the video frequencies involved. After a second doubling, the bandwidth is made 4 Me/see in order to support two sidebands on each side of the carrier. After the final doubling, a bandwidth of 6 Me/see would be required to support all the sidebands above 5 per cent, but it was found experimentally that distortion was not serious if the bandwidth were reduced to 4 hlc/sec. This simplified the amplifier design and resulted in higher r-f power than would otherwise have been available.
SEC. 1714] MICROWAVE SYSTEM FOR POINT-TO-POINT SERVICE 723 Two miniature double diodes are included in the transmitter for monitoring purposes. One of these tubes is connected as a discriminator to provide a video-output test point at the antenna-line connector. During all testing, this video signal gives an accurate over-all check of the r-f and video sections of the transmitter. One half of the remaining double diode is used as an r-f detector to provide a relative power indication on a panel meter which is also used, by means of a rotary selector switch, to measure the grid currents of the several doublers. This diode is also connected to a test point to allow a scope to be used when over-all alignment and bandwidth measurements are being made. Because of the stability of this transmitter, it was found unnecessary to use a bidirectional coupler with it. The receiver has one tuned r-f stage, a mixer, a local oscillator, seven i-f stages, two limiters, a discriminator, a video amplifier, and three tubes connected in parallel as a cathode-follower output stage. All the tubes in this section of the receiver are 6AK5 miniature pentodes, except the one used in the dk.criminator which is a 6AL5 miniature double diode. The r-f, i-f, and video sections, as well as the discriminator, are standard in design, an 8-Me/see bandwidth in the i-f amplifier being obtained by double staggering of alternate stages. A two-stage limiter is used to insure constant input-signal voltage at the discriminator. Both limiter tubes operate at reduced plate and screen voltages to reduce the grid swing necessary to cause plate limiting. A fast time constant in the grid circuit of the first limiter was chosen to discriminate against impulse noise by producing the Ylmiting bias quickly. Longer time constants are possible in the second limiter since the signal variations at thk tube are neither large nor of short duration. This equipment has been given extensive airborne tests in conjunction with two different types of synchronization equipment, and has also been operated between fixed ground stations. 17.14. Microwave <strong>System</strong> for Point -to-point Service.-The two equipments described in Sees. 17.12 and 17”13 were developed primarily for air-to-surface work involving the use of omnidirectional antennas; an upper limit was therefore set to the possible radio frequency. The present section will describe equipment designed for use between fixed ground stations which permit the use of directional antennas. Safe margins of power are easily attainable in such applications since the maximum range is usually sharply limited by the horizon or by roughness of the terrain. The received signal was specified to be 40 db above thermal noise at maximum range in order to provide a safe operating margin. In the application of this criterion to the selection of frequency and antenna sizes, the following table is illuminating. Paraboloid antennas are assumed at both stations.
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CHAPTER 1 INTRODUCTION BY LOUIS N.
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4 IN TRODUC7”ION [SEC.1.2 flik~c
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6 INTRODUCTION [SEC.1.3 pulse leaki
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8 INTRODUCTION [SEC.1.4 antenna is
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10 INTRODUCTION [SEC.14 step in out
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12 INTRODUCTION [SEC.1.5 where high
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14 INTRODUCTION [SEC.1.6 England, F
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16 INTRODUCTION [SEC.1°7 Microwave
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CHAPTER 2 THE lU.DAR EQUATION BY E.
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20 THE RADAR EQUATION [SEC.22 radia
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22 THE RADAR EQUATION [SEC.25 Again
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24 THE RADAR EQUATION [SEC.2.5 time
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26 THE RADAR EQUATION [SEC.2.5 smal
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28 THE RADAR EQUATION [SEC.!2.7 lim
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30 THE RADAR EQUATION [SEC.28 Anoth
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32 THE RADAR EQUATION [SEC.28 first
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34 TIIE RADAR EQUATION [Sm. 29 the
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36 THE RADAR EQUATION [SEC.2.10 (Vo
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38 THE RADAR EQUATION [SEC.210 prac
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40 THE RADAR EQUATION [SEC.2.10 tai
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42 THE RADAR EQUATION [SEC.2.11 swe
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44 THE RADAR EQUATION [SEC.2.11 res
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46 THE RADAR EQUATION [SEC.211 Alth
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48 THE RADAR EQUATION [SEC.212 othe
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50 THE RADAR EQUATION [SEC.212 The
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52 THE RADAR EQUATION [SEC. 2.12 Th
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54 THE RADAR EQUATION [SEC.213 smal
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56 THE RADAR EQUATION [SEC. 2.14 an
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58 THE RADAR EQUATION [SEC.2.15 not
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60 TIIE RADAR EQUATION [SEC.2.15 wt
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62 THE RADAR EQUATION [SEC.215 per
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64 PROPERTIES OF RADAR TARGETS [SEC
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66 PROPERTIES OF RADAR TARGET,S [SE
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PROPERTIES OF RADAR TARGETS [SEC.37
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88 PROPERTIES OF R.41~.l R T.-lRGE~
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92 PROPERTIES OF RA1l.4R TARGETS [S
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SEC.315] STRUCTURES 99 example, the
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SF,C. 3.16] CITIES 101 reflection w
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SEC. 3.16] CITIES 103 signal repres
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SEC. 3.16] CITIES 105 four signals
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108 PROPERTIES OF RADAR TARGETS [SE
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112 PROPERTIES OF RADAR TARGETS [SE
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CHAPTER 4 LIMITATIONS OF PULSE RADA
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118 LIMITATIONS OF PULSE RADAR [SEC
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122 LIMITATIONS OF PC’LSE RADAR [
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128 C-W RADAR SYSTEMS [SEC. 5.1 tar
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130 C-W RADAR SYSTEMS [sm. 53 point
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132 C-W RADAR S’YSTEMS [SEC.56 bi
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134 C-W RADAR SYSTEMS [SEC. 56 tran
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136 C-W RADAR SYSTEMS [SEC. 5.6 int
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138 C-W RADAR SYSTEMS [SEC, 5.6 rel
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140 C-W RADAR SYSTEMS [SEC 37 and j
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142 C-II’ RADAR SYSTEMS [SEC. 57
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144 C-W RADAR SYSTE.JfS [SEC. 58 gi
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146 C-W RADAR SYSTEMS [SEC. 58 Modu
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148 C-T RA DAR S YSTE.lf S [SEC. 59
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150 C-W RADAR SYSTEMS [SEC. 5.11 cy
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152 C-W RADAR SYSTEMS [SEC.5.11 Now
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154 C-W RADAR SYSTEMS [SEC.5.11 exc
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156 C-W RADAR SYSTEMS [SEC. 5.11 in
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158 C-W RADAR SYSTEMS [SEC. 5.12 Pu
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CHAPTER 6 THE GATHERING AND PRESENT
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162 THE GATHERING AND PRESENTATION
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168 THE GATHERING AND pRESENTA TION
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~70 THE GATHERING AND PRESENTA TION
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SEC. 66] PLANE DISPLAYS INVOLVING E
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SEC. 69] IiARLY AIRCRAFT-WARNING RA
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SEC. 69] EARLY AIRCRAFT-WARNING RAD
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f$Ec. 69] EARLY AIRCRAFT-WARNING RA
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SEC. 6.9] EARLY AIRCRAFT-WARNING RA
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SEC. 6.10] PPI RADAR FOR SEARCH, CO
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SEC. 6.11] HEIGHT-FINDING INVOLVING
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SEC.6.12] HEIGHT-FINDING WITH A FRE
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- - -— . .. —-— - .. —-.
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SEC. 612] HEIGHT-FINDING J~ITH A FR
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SEC. 6.13] HOMING 197 ber of the pa
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SEC.6.13] HOMING 199 usually made t
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SEC. 6.13] HOMING 201 application,
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SEC. 6.14] PRECISION TRACKING OF A
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SEC.6.14] PRECISION TRACKING OF A S
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SEC. 614] PRECISION TRACKING OF A S
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f$Ec. 614] PRECISION TRACKING OF A
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SEC. 615] PRECISION TRACKING DURING
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CHAPTER 7 THE EMPLOYMENT OF RADAR D
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SEC.72] AIDS TO INDIVIDUAL NAVIGATI
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SEC. 7.2] AIDS TO INDIVIDUAL NAVIGA
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SEC. 73] AIDS TO PLOTTING AND CONTR
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SEC.7.3] AIDS TO PLOTTING AND CONTR
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SEC.7.3] AIDS TO PLOTTING AND CONTR
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SEC. 7.4] THE RELAY OF RADAR DISPLA
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SEC. 7.51 RA DAR IN THE RAF FIGHTER
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SEC. 7.6] THE U.S. TACTICAL AIR COM
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SEC.7.6] THE U.S. TACTICAL AIR COMM
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238 THE EMPLOYMENT OF RA DAR DATA [
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240 THE EMPLOYiWENT OF RADAR DATA [
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242 THE EMPLOYMENT OF RADAR DATA [S
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244 RADAR BEACONS [SEC. 8 duration
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246 RADAR BEACONS [SEC. 8.1 beacons
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248 RADAR BEACONS [SEC.8.1 4. Porta
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250 RADAR BEACONS [SEC.8.2 Table 8.
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252 RADAR BEACONS [SEC.84 restricte
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254 RADAR BEACONS [SEC. 85 radar se
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256 RADAR BEACONS [SEC.85 In the ca
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258 It Al)AIt BEACONS [S,,c, S3 Sim
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SEC. 86] FREQUENCY CONSIDERATIONS 2
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SEC. 87] INTERR~A TION CODES 263 wi
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SEC. 8.9] TRAFFIC CAPACITY 265 diff
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SEC.8.9] TRAFFIC CAPACITY 267 which
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270 RADAR BEACONS [SEC. 810 range a
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272 ANTENNAS, SCANNERS, A.VD STABIL
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274 ANTENNAS, SCANNERS, AND ST ABIL
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276 ANTENNAS, SCANNERS, AND STABILI
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SEC. 913] THE AN/APQ-7 (EAGLE) SCAN
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SEC.913] THE AN/APQ-7 (EAGLE) SCANN
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SEC. 9.14] SCHWA RZSCHILD ANTENNA 2
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SEC. 9.14] SCH WA RZSCHILD ANTENNA
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SEC. 9.15] SCI HEIGHT FINDER 299 de
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SEC.9.15] SCI HEIGHT FINDER 301 In
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SEC.916] OTHER TYPES OF ELECTRICAL
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SEC,9.17] STABILIZATION OF THE BEAM
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SEC. 9.17] STABILIZATION OF’ THE
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SEC. 9.17] STABILIZATION OF THE BEA
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t$Ec. 9,18] DATA STABILIZATION 311
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SEC. 920] INSTALLATION OF SURFACE-B
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SEC. 922] STREA MLIA”ING 315 func
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SEC. 9.25] EXAMPLES OF RADOMES 317
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SEC.9.25] EXAMPLES OF RADOMES 319 a
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SEC. 10.1] CONSTRUCTION 321 of the
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SEC. 10.1] CONSTRUCTION 323 later r
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SEC.10.2] THE RESONANT SYSTEM 325 m
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SEC. 1021 THE RESONANT SYSTEM 327
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SEC. 10.2] THE RESONANT SYSTEM 329
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SEC. 103] ELECTRON ORBITS AIVD THE
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SEC. 103] ELECTRON ORBITS AND THE S
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SEC. 103] ELECTRON ORBITS AND THE S
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SEC. 10.4] PERFORMANCE CHARTS AND R
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SEC. 10.4] PEIWORMilNCE CHARTS AND
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SEC. 10.5] MAGNETRON CHARACTERISTIC
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SEC.105] MAGNETRON CHARACTERISTICS
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SEC. 105] MAGNETRON CHARACTERISTICS
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SEC. 10.5] MAGNETRON CHARACTERISTIC
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SEC. 10.6] MAQNETRON CHARACTERISTIC
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L%C. 10.6] MAGNETRON CHARACTERISTIC
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SEC. 10.7] PULSER CIRCUITS 357 and
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SEC. 10.7] PULSER CIRCUITS 359 tude
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SEC. 10.7] PULSER CIRCUITS 361 cen~
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SEC. 108] LOAD REQUIREMENTS 363 TAB
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SEC. 10.8] LOAD REQUIREMENTS 365 to
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SEC. 109] THE HARD-TUBE P ULSEh? 36
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SEC. 10.9] THE HARD-TUBE P ULSER 36
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SEC 10.9] THE HARD-lUBE PULSER 371
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Sl?lc.10.91 LINE-TYPE PULSERS 373 D
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SEC. 10,10] LINE-TYPE PULSERS 375 i
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SEC. 10.10] LINE-TYPE PULSERS 377 I
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SEC. 10.10] LINE-T YPE PULSERS 379
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SEC. 10.10] LINE-TYPE PULSERS 381 T
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SEC.10.11] MISCELLANEOUS COMPONENTS
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SEC. 1011] MISCELLANEOUS COMPONENTS
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R-F CHAPTER 11 COMPONENTS BY A. E.
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SEC.11.2] COAXIAL LINES 393 Why a M
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SEC.11.2] COAXIAL LINES 395 lines h
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SEC.11.2] COAXIAL LINES 397 since n
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SEC,113] JVA VEGUIDE 399 than a qua
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i?EC. 11.3] WA VEGUIDE 401 too grad
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SEC. 113) WA VEGUIDE 403 types of m
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SEC. 11.4] RESONANT CAVITIES 405 co
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SEC. 11.5] D,C”PLEXING AND TR SWI
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SEC. 115] DUPLEXING AND TR SWITCHES
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SEC. 11.5] DUPLEXING AND TR SWITCHE
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SEC.11.6] THE MIXER CRYSTAL 413 sem
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SEC. 11.7] THE LOCAL OSCILLATOR 415
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SEC. 11 .8] THE MIXER 417 minimum l
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SEC.11.10] REASONS FOR AN R-F PACKA
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SEC. 11.11] DESIGN CONSZDERA TZONS
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SEC.11.11] DESIGN CONSIDERATIONS FO
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SEC. 11.12] ILLUSTRATIVE EXAMPLES O
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SEC. 11°12] ILL US’TRA TIVE EXAM
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SEC. 11.12] ILL USTRA TIVE EXAMPLES
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SEC.11.12] ILL US1’IiA TI VE EXA
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CHAPTER 12 THE RECEIVING SYSTEM—R
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SEC. 122] A TYPICAL RECEIVING SYSTE
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SEC.12.2] A TYPICAL RECEIVING SYSTE
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SEC. 122] A TYPICAL RECEIVING SYSTE
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SEC.12.3] SPECIAL PROBLEMS IN RADAR
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SEC.12.4] I-F AMPLIFIER DESIGN 443
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SEC.12.4] I-F AMPLIFIER DESIGN 445
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SEC.124] I-F AMPLIFIER DESIGN 447 i
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SEC. 125] SECOND DETECTOR 449 This
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SEC.12.6] VIDEO AMPLIFIERS 451 ampl
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SEC.12.7] A UTOMA TIC FREQUENCY CON
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SEC. 12.7] A UTOMA TIC FREQUENCY CO
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S~C. 128] PROTECTION AGAINST EXTRAN
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SEC. 128] PROTECTION AGAINST EXTRAN
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SEC. 12.8] PROTECTION AGAINST E-YTR
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&- L,-self resonant COIIS at mterme
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J All resistors~ watt Interstate co
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SEC. 12.10] LIGHTH”EIGIIT AIRBOR.
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s, 0.001 $180 b To reflector To sea
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+ 180v T +120V 470 470 470 470 e“
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SEC.12.11] AN EXTREMELY WIDEBAND RE
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CHAPTER 13 THE RECEIVING SYSTEM—I
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SEC.13.1] ELECTRICAL PROPERTIES OF
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SEC 13.2] CATHODE-RAY TUBE SCREENS
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SEC.13.2] CATHODE-RAY TUBE SCREENS
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SEC. 13.3] SELECTIO.V OF THE CATHOD
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SEC. 13.3] SELECTION OF THE CATHODE
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SEC. 13.4] ANGLE-DATA TRANSMITTERS
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SEC.13.4] ANGLE-DATA TRANSMITTERS 4
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SEC. 13.5] ELECTROMECHANICAL REPEAT
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SEC. 13.6] AMPLIFIERS 493 whence th
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SEC. 13.6] AMPLIFIERS 495 by using
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SEC. 13.7] GENERA TION OF RECTANGUL
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SEC. 13.7] GENERATION OF RECTANGULA
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. SEC. 13.8] GENERA TION OF SHARP P
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SEC. 139] ELECTRONIC SWITCHES 503 T
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SEC. 13.9] ELECTRONIC SWITCHES 505
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SEC. 13.9] ELECTRO.VIC ISWI TCHES 5
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SEC. 13.9] ELECTRONIC SWITCHES 509
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SEC. 1310] SAWTOOTH GENERATORS 511
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SEC.13.10] SAWTOOTH GE,VBliATOh?S 5
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SEC. 1311] ANGLE INDICES 515 bright
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SEC. 13.11] ANGLE INDICES 517 the s
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. . “4 100k.lw $4.7k-lw .& t, T 0
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SEC.K3.121 RANGE AND HEIGIiT INDICE
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i%C.13121 RANGE AND HEIGHT INDICES;
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SEC. 13.13] DESIGN OF A-SCOPES 525
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SEC. 1313] DESIGN OF A-SCOPES 527 f
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SEC.1314] B-SCOPE DESIGN 529 \
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SEC. 13.14] B-SCOPE DESIG.V 531 wil
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Trigger I I I (CT)Sawtooth —. (A)
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SEC.1316] RESOLVED TIME BASE PPI 53
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SEC. 13.16] RESOLVED mi? TIME BASE
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SEC. 13.17] RESOLVED-CURRENT PPI 53
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SEC. 13.17] RESOLVED-CURRENT PPI 54
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+ 200V— — — J 60k . Llk )k 60
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SEC. 13.19] 1’HE RANGB-ll EIGII1
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SEL!. 13.19] THE RANGE-HEIGHT INDIC
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SEC. 13.20] RESOLUTION AND CONTRAST
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SEC. 13.211 SPECIAL RECEIVING TECHN
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554 THE RECEIVING SYSTEM-INDICATORS
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556 PRIME POWER SUPPLIES FOR RADAR
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. . . 0.9 P~- 860-’CPS CF over 2
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562 PRIME POWER SLTPPLIES FOR RADAR
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SEC. 14.6] SPEED REGULATORS 575 ‘
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SEC. 146] SPEED REGULATORS 577 havi
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SEC. 14.7] DYNAMOTORS 579 14.7. Dyn
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SEC.14.8] VIBRATOR POWER SUPPLIES 5
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SEC. 1410] FIXED LOCATIONS 583 port
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SEC. 14.13] ULTRAPORTABLE UNITS 585
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SEC. l’k~~] SHIP RADAR SYSTEMS 58
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SEC. 151] INTRODCCTIO,\- 589 the pr
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SEC, 152] NEED FOR SYSTEM TESTING 5
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SEC, 153] INITIAL PLANNING AND OBJE
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SEC. 15.4] THE RANGE EQUATION 595 n
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SEC. 15.5] CHOICE OF PULSE LENGTH 5
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SEC. 15.7] AZIMUTH SCAN RATE 599 to
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SEC. 15.8] CHOICE OF BEAM SHAPE 601
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SEC. 15.8] CHOICE OF BEAM SHAPE 603
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SEC. 15.9] CHOICE OF WAVELENGTH 605
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SEC. 15.10] COMPONENTS DESIGN 607 1
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SEC.16.11] MODIFICA TIO.VS A,YD ADD
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SEC. 15.12] DESIGN OBJECTIVES AND L
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SEC. 15.12] DESIGN OBJECTIVES AND L
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SEC. 15.13] GENERAL DESIGN OF THE A
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SEC. 15.14] DETAILED DESIGN OF THE
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SEC. 15.14] DETAILED DESIGN OF THE
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,/ / /“)4 Providenc~ (b) Fm. 16.1
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624 EXAMPLES OF RADAR SYSTEM DESIGN
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CHAPTER 16 MOVING-TARGET INDICATION
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628 MOVING-TARGET INDICATION [SEC,
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630 MOVING-TARGET INDICATION [SEC.
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632 MOVING TARGET INDICATION [SEC.
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. 646 MOVING- TARGET INDICATION [SE
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648 MOVING- TARGET lNDICA TION [SEC
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652 MOVING-TARGET INDICATION [SEC 1
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656 MOVING-TARGET INDICATION [SEC.1
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658 When o = Othe instead MOVING-TA
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662 MOVING TARGET INDICATION [SEC.1
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670 MO VINGTARGET INDICATION [SEC.
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Page 680 and 681: CHAPTER 17 RADAR RELAY BY L. J. HAW
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Page 698 and 699: 698 RADAR RELAY [SEC. 17.6 Video si
Page 700 and 701: 700 RADAR RELAY [SEC. 176 train. Th
Page 702 and 703: 702 RADAR RELAY [SEC.17.7 be obtain
Page 704 and 705: 704 RADAR RELAY @EC. 17.7 illustrat
Page 706 and 707: [11 1 Bas,c pulse I %e pulse i ~--.
Page 708 and 709: 708 RADAR ltELA Y [SEC. 1743 wave f
Page 710 and 711: 710 RADAR RELAY [SEC. 17.8 actual m
Page 712 and 713: . 712 RADAR RELAY [SEC. 17.9 Such a
Page 714 and 715: 714 RADAR RELAY [SEC. 17.10 between
Page 716 and 717: 716 RADAR RELAY [SEC. 17.10 signal
Page 718 and 719: 718 RADAR RELAY [SEC. 17.11 suppres
Page 720 and 721: 720 RADAR RELAY [SEC. 17.12 provide
Page 724 and 725: 724 RADAR RELAY [SEC. 17.14 TaLE 17
Page 726 and 727: 726 RADAR RELAY [SEC. 17.15 RADAR R
Page 728 and 729: 728 RADAR RELAY [SEC. 17.15 Modulat
Page 730 and 731: 730 RADAR RELAY [SEC. 17.15 the sec
Page 732 and 733: 732 RADAR RELAY [SEC. 17.10 pulses
Page 734 and 735: 734 RADAR RELAY [f+iEc.17.16 The vi
Page 737 and 738: Index A Absorbent materials, 69 Abs
Page 739 and 740: INDEX 739 B-scope, electrostatic, 5
Page 741 and 742: INDEX 741 Fairbank, W. M.,80 F Fan
Page 743 and 744: INDEX ’743 Microwave, reason for
Page 745 and 746: INDEX 745 Radar, pulse,3 range perf
Page 747 and 748: INDEX 747 Signal, interference of,
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Radar System Engineering

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