Page 78 - RTH3BA Preview

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polarisation 240
F
principle of reciprocity 241
radiation and reception 241
the mechanism of radiation 230 Filters 370
uses of electromagnetic radiation 238 bandpass crystal filter 376
velocity of light 230 bandpass filter 371
bandstop filter 371
Electron tubes 206
cavity duplexer 380
amplifier with positive feedback 212
cavity filters 379
cathodes 207
circulators 382
construction of the electron tube 209
constant k 374
control grid 208
crystal filter 375
degeneration 214, 269
dual ferrite isolator 385
diode 208
duplexer 381
duo diodes and triodes 216
filter curves 376
Edwin Howard Armstrong 218
highpass filter 371
feedback 212
how a cavity filter works 381
generic amplifier 212
insertion loss 374
getter 207
isolator 383
Lee de Forest 218
lowpass filter 371
microphonics 216
lowpass filter placement 378
neutralisation 214
mains filter 378
pentodes 215
significant attenuation 372
positive feedback 211
stripline filters 386
screen grid 211
transmitter intermodulation 384
self oscillation 211
transmitter isolation 385
soft tube 216
tuned circuits 371
space charge 207
TV filter 386
suppressor grid 215
tetrode - reduces internal capacitance 214 Frequency modulation 405
tetrodes 211 advantages of FM 412
thermionic emission 206 bandwidth equation 410
triode 208 Bessel functions 410
triode amplifier 213 block diagram of an FM receiver 415
triode as an amplifier 210 capture effect 413
triode disadvantage 210 complete FM transceiver 420
unwanted capacitance 211, 213 de-emphasis 413
x-rays 215 deviation of an FM wave 408
disadvantages of FM 413
FM modulator 407
FM transmitters 419
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