73 lines
1.8 KiB
Markdown
73 lines
1.8 KiB
Markdown
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# [The Full Technician Study Guide](https://www.kb6nu.com/wp-content/uploads/2023/03/2022-no-nonsense-tech-study-guide-v2-20230204.pdf)
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- the unit of frquency is Hz
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- Radio is an alternating current
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- voltage = current x reistance (E = I x R)
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- the number of cycles per second if the frequency
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- the unit of resistance is the ohm
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- the unit of capacitor is the farad
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- what image is usually depicted as a coil of wire = inductor
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- the unit of inductance is the henry
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- the voltage stays on a capacitor but it does not on an inductor
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- the following battery chemistries are rechargeable
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- nickel-metal hydride
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- lithium ion
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- lead acid
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- the following bettery chemistry is not rechargeable
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- carbon zince
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- Rapid flutter on mobile signals due to multipath propagation is called **picket fencing**
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-
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sidenote: **A Zener diode** is a special type of diode designed to reliably allow current to flow "backwards" when a certain set reverse voltage, known as the Zener voltage, is reached. Zener diodes are manufactured with a great variety of Zener voltages and some are even variable
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- finding tropsopheric duct - https://dxinfocentre.com/tropo_eur.html
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### **Units**
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G (giga) = 10^9
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M (mega) = 10^6
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k (kilo) = 10^3
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--
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m (milli) = .001 10^-1
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M (micri) = .000000 19^-6
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n (nano) = 0.000000000 10^-9
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p (pico) = 10^12
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500 mW = 0.5 W
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3000 mA = 3 A
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3.525 MHz = 3525 kHz
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284400 kHz = 28.400 MHz
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- Decibels (power ratios):
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- 3 dB --> 2:1 (ex. 5W --> 10W)
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- 6 dB --> 4:1
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- 10 dB --> 10:1
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- Decibels are logarithmic
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electronic current that allows current to flow in only one direction --> diode
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what are the two charges of a diode --> anode + cathode
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- Electrolytic capacitor
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- transistors can be used as an electronic switch
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- can also be used an amplifier
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- FET = field effect transistor
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- bipolar junction transmitter
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- NPN
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- PNP
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