# [The Full Technician Study Guide](https://www.kb6nu.com/wp-content/uploads/2023/03/2022-no-nonsense-tech-study-guide-v2-20230204.pdf)



- the unit of frquency is Hz 
- Radio is an alternating current 
- voltage = current x reistance (E = I x R)
- the number of cycles per second if the frequency 
- the unit of resistance is the ohm 
- the unit of capacitor is the farad 
- what image is usually depicted as a coil of wire = inductor 
- the unit of inductance is the henry 
- the voltage stays on a capacitor but it does not on an inductor 
- the following battery chemistries are rechargeable 
	- nickel-metal hydride 
	- lithium ion 
	- lead acid 
- the following bettery chemistry is not rechargeable 
	- carbon zince 
- Rapid flutter on mobile signals due to multipath propagation is called **picket fencing**
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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

- finding tropsopheric duct - https://dxinfocentre.com/tropo_eur.html



### **Units**

G (giga) = 10^9
M (mega) = 10^6
k  (kilo) = 10^3

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m (milli) = .001 10^-1 
M (micri) = .000000 19^-6 
n (nano) =  0.000000000 10^-9
p (pico) = 10^12



500 mW = 0.5 W 
3000 mA = 3 A 
3.525 MHz = 3525 kHz 
284400 kHz = 28.400 MHz 


- Decibels (power ratios): 
	- 3 dB --> 2:1   (ex. 5W --> 10W)
	- 6 dB --> 4:1 
	- 10 dB --> 10:1 
	- Decibels are logarithmic 




electronic current that allows current to flow in only one direction --> diode 

what are the two charges of a diode --> anode + cathode 


- Electrolytic capacitor
- transistors can be used as an electronic switch 
	- can also be used an amplifier
- FET = field effect transistor 
- bipolar junction transmitter
- NPN  
- PNP 
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