Ham Radio

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Frequency Ranges

RF-bands.jpg


Frequency Ranges - Split by order of magnitude:

HAMMagnitudeBottomTopName
?3x10^00.003 MHZ0.03 MHzVery Low Frequency (VLF)
?3x10^10.03 MHZ0.3 MHzLow Frequency (LF)
3x10^20.3 MHZ3 MHzMedium Frequency (MF)
10 meters 28-29.7 MHz3x10^33 MHZ30 MHzHigh Frequency (HF)
6 meter 50-54 MHz
4 meter 70-70.5 MHz
2 meter 144-148 MHz
3x10^430 MHZ300 MHzVery High Frequency (VHF)
70 centimeter 420-450 MHz3x10^5300 MHZ3,000 MHzUltra High Frequency (UHF)
?3x10^63,000 MHZ30,000 MHzSuper High Frequency (SHF)
?3x10^730,000 MHZ300,000 MHzExtreme High Frequency (EHF)

ref: [1]

The United States Radio Frequency Spectrum Chart

The United States Radio Frequency Spectrum Chart (PDF)

United States Frequency Allocation Chart

Utah County Clubs

Stake Emergency Net

ARES

Amateur Radio Emergency Service (ARES)

ARRL: ARES

Utah County ARES (UCARES)

Utah County ARES

When: weekly training nets held every Tuesday at 2100h (9pm) on the 147.34 repeater:

Where: 147.34 MHz + (100.0 Hz)

Training nets are held every Tuesday evening at 2100 hours local time on the 147.34+ repeater

Net Control Script

RACES

Radio Amateur Civil Emergency Service (RACES)

What Is RACES?:

"Founded in 1952, the Radio Amateur Civil Emergency Service (RACES) is a public service that provides a reserve communications group within government agencies in times of extraordinary need. During periods of activation, RACES personnel are called upon to perform many tasks for the government agencies they serve. Although the exact nature of each activation will be different, the common thread is communications."

N7BSA.ORG

N7BSA.ORG Explorer Post 1973

When: Every Wednesday at 8pm (or on the first wednesday after the meeting). The next net is on October 31st

Where: 147.47+ with a tone of 100hz

Repeater Directory

Utah Repeaters

The Utah VHF Society: Frequency Coordination

Antennas

J-Pole Antenna

KB9VBR J-Pole Antenna

"The J-pole antenna is an end-fed omnidirectional dipole antenna that is matched to the feedline by a quarter wave transmission line stub. Matching to the feed-line is archived by sliding the connection of the feedline back and forth along the stub until an SWR as close as possible to 1:1 is obtained. Since this is a half-wave antenna, it will exhibit gain over a quarter-wave ground-plane antenna." [2]

Wiki: J-pole antenna

The J-Pole is quite simply an antenna that works marvelously. [3]

As a half wave antenna, the J-Pole doesn't need any radials or a ground plane to work. Average gain with a 2 meter J-Pole is about 3 db. Many like to compare the gain and antenna pattern to that of a Ringo Ranger. The biggest advantage of the J-Pole is that it is at DC ground, so it can be mounted just about anywhere and still work. [4]

The J-pole is somewhat sensitive to surrounding metal objects, and should have at least a quarter wavelength of free space around it. [5]

Detailed J-Pole construction plans

Purchase J-Pole Antenna for about $30 + $8 shipping

Dipole Antenna

Wiki: Dipole Antenna

"A dipole antenna is an antenna with a center-fed driven element for transmitting or receiving radio frequency energy. These antennas are the simplest practical antennas from a theoretical point of view." [6]

"A Slim Jim or J-pole is a form of end-fed dipole connected to a quarter-wave monopole used as a stub matching section." [7]

Ground Plane Antenna

Rubber Ducky Antenna

Wiki Rubber Ducky Antenna

"The Rubber Ducky antenna is an electrically short antenna which functions somewhat like a base-loaded whip or monopole antenna and is sealed in a rubber or plastic jacket to protect the antenna. Electrically short antennas are often used in portable equipment because a one-quarter wave-length element, necessary for resonance of a linear element over a ground-plane, is often too long for convenient portable operation." [8]

"...where safety and robustness take precedence over antenna capabilities."

Terms

Ground Plane

Wiki: Ground Plane

"In electrical engineering, a ground plane is an electrically conductive surface." [9]

A Quick and Simple 2 Meter Ground Plane Project!

db and decibel

See #Decibel

Logarithm

Wiki: Logarithm

0fa5302fc3766228f9f626351ff040cb.png is equivalent to c538f16af44351c5711bf21f39f47bf9.png

y = log b(x) is equivalent to x = b^y

Decibel

See Decibel

Coaxial Cable

See Coax Cable Attenuation Details

EchoLink

EchoLink

"EchoLink® software allows licensed Amateur Radio stations to communicate with one another over the Internet, using voice-over-IP (VoIP) technology. The program allows worldwide connections to be made between stations, or from computer to station, greatly enhancing Amateur Radio's communications capabilities. There are more than 200,000 validated users worldwide — in 162 of the world's 193 nations — with about 3,800 online at any given time."

ICOM IC-T2H



Mods:

Repeaters

Radios

Wants

Stores

Options

Style Make Model Band Watts Price
Mobile Yaesu / Vertex Standard FT-7800R + YSK-7800 144/440 MHz 50/40 W $230
Mobile Icom IC-208H 144/430 MHz 55/50 W $280
Mobile Yaesu / Vertex Standard FT-1802M 144 MHz 65 W $133.95
Mobile Yaesu / Vertex Standard FT-2800M 144 MHz 50 W $117.95

Connectors

See Ham Radio/Connectors

To Read

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