Things to remember
Disclaimer
Electricity is dangerous and you can suffer death or serious injury if you use incorrect or erroneous information.
This page is essentially an aide memoire for my personal use. It is on the web so that I can accesses it easily from wherever I am using whatever device is at hand.
You should find other references for your own use.
I am not an engineer or electrician. I have no formal qualifications. I have just googled this information and taken results I think look reasonable from sources I think might be authoritative.
You should find your own sources and check their quality, veracity and authenticity.
Electricity is dangerous and you can suffer death or serious injury if you use incorrect or erroneous information.
Glossary
- λ- wavelength - also the Greek letter Lamba. Unit: metres
- Ω - ohms - the unit of resistance/impedance. The Greek letter Omega.
- c - constant - the speed of light in a vacuum also see 'v'. Unit: metres per second
- C - the symbol for capacitance
- Capacitance - The ability to oppose changes of voltage.
- f of ƒ - frequency - the number of cycles per second. Unit: hertz
- F - Farad - unit of capacitance.
- v - velocity - the speed of light in a vacuum also see 'c'. Unit: metres per second
- ACMA - Australian Communication and Media Authority - the Australian regulator for Amateur Radio.
- Dipole - λ/2. λ/4 for the driven element/radiator and λ/4 for the reflector/ground
- Driven element - the element that has power applied - the center of the coax
- Impedance - roughly the AC equivilant to resistance in DC. A combination of resistance and reactance. Unit: Ohms (Ω)
- L - the symbol for inductance
- Monopole - λ/4 for the driven element. Some for the radial/groundplane
- PEP - peak envelope power
- Q - Low Q high bandwidth. High Q high efficiency over lower bandwidth. Q is an indicator of loss
- Reflector - the element that is attached to the ground of the coax
- X - the symbol for reactance
- XC - capactive reactance
- XL - inductive reactance
XC = 1/(2πƒc) where:
- ƒ - frequency
- c - capative reactance in Ω
- ƒ - option -f
- Ω - option z
- λ - option l with a Greek charset
Wavelength and Frequency Conversion
f = v / λ - wavelength to frequency
λ = v / f - frequency to wavelenght = v = 300 ƒ=wavelength in meters
Links
https://portable-antennas.com/linkd.php - linked dipole calculator
Bands Available in Australia
Band | Frequency | Advanced | Standard | Freedom |
160 metres | 1.800 MHz - 1.875 MHz | Y | ||
80 metres | 3.500 MHz - 3.800 MHz | Y | Y | Y |
40 metres | 7.0 00 MHz - 7.300 MHz | Y | Y | Y |
30 metres | 10.100 MHz - 10.150 | Y | ||
20 metres | 14.000MHz-14.350MHz | Y | Y | |
17 metres | 18.068 MHz -18.168 | Y | ||
15 metres | 21.000 MHz - 21.450 MHz | Y | Y | Y |
12 metres | 24.890 MHz - 24.990 MHz | Y | ||
10 metres | 28.000 MHz - 29.700 MHz | Y | Y | Y |
6 metres | 50.000MHz - 54.00MHz | Y | Y | |
2 metres | 144.000 MHz - 148.000 MHz | Y | Y | Y |
70 Centimetres | 420.000 MHz - 450.000 MHz | Y | Y | Y |
23 Centimetres | 1240.000 MHz - 1300.000 MHZ | Y | Y | |
13 Centimetres | 2300.000 MHz - 2450.000 MHz | Y | Y | |
9 Centimetres | 3.300 GHz - 3.600 GHz | Y | ||
6 Centimetres | 5.650 GHz - 5.850 GHz | Y | Y | |
3 Centimetres | 10.000 GHz - 10.500 GHz | Y | ||
1.25 Centimetres | 24.000 GHz- 24.250 GHz | Y | ||
7.5 Millimetres | 47.000 GHz- 47.200 GHz | Y | ||
3.7 Millimetres | 76.000 GHz- 81.000 GHz | Y | ||
2.5 Millimetres | 122.250 GHz- 123.000 GHz | Y | ||
2 Millimetres | 134.000 GHz- 141.000 GHz | Y | ||
1.25 Millimetres | 241.000 GHz- 250.000 GHz | Y |
Foundation Class Privileges
HF (High Frequency)
80 Metres: 3.500 MHz - 3.700 MHz (typically up to 150KM day, 3000KM night).
40 Metres: 7.000 MHz - 7.300 MHz (typically up to 1000KM day, world-wide at night with good conditions).
15 Metres: 21.000 MHz - 21.450 MHz (world-wide mostly during the day).
10 Metres: 28.000 MHz - 29.700 MHz (world-wide during high sunspot activity).
VHF/UHF (Very High Frequency/Ultra High Frequency)
2 Metres: 144 MHz - 148 MHz (local coverage and world-wide via internet linking systems like EchoLink/IRLP).
70 Centimetres: 430 MHz - 450 MHz (local coverage, long distance via tropospheric ducting and internet linking).
Co-Axial Cable Crimps
Sourced from DX Engineering via https://static.dxengineering.com/global/images/chartsguides/d/dxe-ccsize-info-rev2a.pdf
AC Wiring Colours
Single Phase
Colour/Standard | Current/IEC | Pre 2004 IEE | Pre 1977 IEE |
Protective Earth | Green/Yellow | Green/Yellow | Green |
Neutral | Blue | Black | Black |
Line/Live | Brown | Red | Red |
Three Phase
Phase | New Wire Colour Code | Old Wire Colour Code |
Phase 1 (L1) | Brown | Red |
Phase 2 (L2) | Black | White |
Phase 3 (L3) | Grey | Blue |
Neutral (N) | Blue | Black |
Earth | Green/Yellow | Green |
Disclaimer
Electricity is dangerous and you can suffer death or serious injury if you use incorrect or erroneous information.
This page is essentially an aide memoire for my personal use. It is on the web so that I can accesses it easily from wherever I am using whatever device is at hand.
You should find other references for your own use.
I am not an engineer or electrician. I have no formal qualifications. I have just googled this information and taken results I think look reasonable from sources I think might be authoritative.
You should find your own sources and check their quality, veracity and authenticity.
Electricity is dangerous and you can suffer death or serious injury if you use incorrect or erroneous information.
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