By Rudolf F. Graf
Rudolf Graf and William Sheets have written a ebook containing twenty low-power (LP) transmitter tasks, excellent for the electronics hobbyist and radio experimenter. Now that the FCC has replaced its rules approximately «pirate» transmissions, increasingly more individuals are establishing radio and video stations for broadcast from their houses. construct your personal Low-Power Transmitters addresses functions for hobbyist broadcasting of AM, SSB, television, FM Stereo and NBFM VHF-UHF indications with apparatus the reader can construct himself for millions of greenbacks lower than related apparatus bought at the retail market.
The authors additionally absolutely discover the felony limits and ramifications of utilizing the gear in addition to the best way to get the simplest functionality for max diversity. the foremost virtue is referencing a reasonably cheap resource for all wanted components, together with the published circuit board, in addition to the kit.
Projects within the booklet contain: LP FM stereo transmitter digitally synthesized PLL FM stereo transmitter LP AM transmitter for 150-1710 KHz radio keep watch over transmitter/receiver provider present transmitter and AM and FM receivers LP VHF one-way and two-way audio hyperlinks 1-watt 40-meter CW transmitter for ham radio use SSB LP transmitter for 10-meter ham radio use 2-meter VHF FM ham radio transmitter FM video hyperlink for 900 MHz NTSC/PAL operation 2-watt television transmitters for 440, 900 and 1300 MHz novice television NTSC/PAL transmissions linear amplifier for 440MHz, 10-15watt NTSC/PAL operation Downconverters for 440, 900 and 1300 MHz with VHF channel three or four output television video receiving structures and AM-FM IF platforms LP video hyperlink for UHF channels 14-18 1-watt CW transmitter for half 15 LF radio experimentation CW identifier for transmitters attempt gear tasks for LP transmitters in addition to an RF energy meter and modulation visual display unit.
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Extra resources for Build Your Own Low-Power Transmitters Projects for the Electronics Experimenter
Audio is coupled to the modulated oscillator via C2 and R7. R4 is a gain control and is used to set the optimum value of gain for the application. The oscillator portion is identical to that of the wireless mike, so we do not discuss it in detail. Note that it is fed DC from a resistor and zener diode regulator, R10 and D1, to supply a constant 9 volts to the oscillator. This aids in reducing frequency drift caused by variations in supply voltage. C5 and C6 are RF bypass and noise-ﬁlter 25 Build Your Own Low-Power Transmitters: Projects for the Electronics Experimenter Figure 3-2 Wireless Baby Monitor Operating at 88-108MHz capacitors, respectively.
The synthesizer covers all of these frequencies, but in the interest of optimum synthesizer performance and considering cost limitations and circuit simplicity, the tuning range has been restricted to 2 MHz. The synthesizer supports all channels between 150 and 1710 kHz in 1-kHz increments. Frequencies from as low as 50 kHz and as high as 2047 kHz can be generated, but the circuit component values—mainly in the ﬁlters and RF chokes—are not optimum at these extremes. In order to cover these extremes, some changes in values of these components are necessary, which is beyond the scope of this discussion.
This sets the resolution of the synthesizer. The maximum input frequency that this chip can directly handle is approximately 12 MHz worst case. S. 1600–1710 kHz section) and most areas in the Americas. In other parts of the world, channels with 9-kHz spacing are used. Additionally, in Europe and parts of Asia, the long-wave band is used, with frequencies between 150 and 285 kHz, also at 9-kHz channel spacing. The synthesizer covers all of these frequencies, but in the interest of optimum synthesizer performance and considering cost limitations and circuit simplicity, the tuning range has been restricted to 2 MHz.
Build Your Own Low-Power Transmitters Projects for the Electronics Experimenter by Rudolf F. Graf