Central States VHF Society

Exploring the World Above 50MHz since 1965

  • Digital Communications

    A great number of exciting new digital operating modes have developed, largely because of the availability of personal computers, soundcards, and advanced software. But amateur digital communication began in earnest in the late 1940's (if you don't count Morse as a digital mode!) when hams worked out techniques of connecting mechanical Teletype keyboard/printers to amateur gear using FSK and AFSK modulation. WSJT has become a very popular tool for digital communications. FSK441 mode is in use for meteor scatter contacts and JT65 is popular for terrestrial communications.More Info
  • EME Moonbounce

    Amateur radio (ham) operators utilize EME for two-way communications. EME presents significant challenges to amateur operators interested in working weak signal communications. Currently, EME provides the longest communications path any two stations on Earth can utilize for bi-directional communications. Amateur operations use VHF, UHF and microwave frequencies. All amateur frequency bands from 50 MHz to 47 GHz have been used successfully, but most EME communications are on the 2 meter, 70-centimeter, or 23-centimeter bands. Common modulation modes utilized by amateurs are continuous wave with Morse Code, digital (JT65) and when the link budgets allow, voice..More Info
  • Aurora and Solar Weather

    The interaction between Earth's magnetic field and Solar particles is a complex and mysterious field of science. The storm events involve high electric currents in the ionosphere and vast amounts electric power affecting to great many things. One of the ways to observe what is happening up there, is to detect the effects of these phenomena to non ionizing long wave electromagnetic radiation - radio waves.More Info
  • VHF Contesting and Rover Operations

    Hams have been putting stations in their cars since the Twenties (1920's that is). Today, there is great satisfaction in facing the challenge of installing a transceiver in our small cars and pick-ups, using somewhat inefficient antennas, and still being able to make contacts with hams thousands of miles away while "tooling" down the highway.More Info
  • Annual Technical Conference

    Every year since 1968, during the last weekend in July, the Central States VHF Society hosts an annual technical conference. There are two days of technical presentations, antenna range gain measurements, noise figure measurements, a flea market, and often times a vendor area. It's a great time to learn about weak signal VHF communications and an excellent place to network and catch up with old friends.More Info

1995 Antenna Gain Results

Tested in Colorado Springs 28 July 1995


50 MHz CallDesignGain (dBd)
N6CL3 Element Yagi6.0
N6CL3 Element Linear Loaded Yagi5.6
144 MHz CallDesignGain (dBd)
N0LRJ19 Element Quad Loop Yagi14.0
N0LRJ15 Element Portable Giant Quad LY12.7
W7GZ10 Element Yagi11.0
WG6K12 Element NBS8.9
KA2KQMStacked 4 Element Quads7.2
KC0P4 Element Yoke Feed6.8
KC0P4 Element Gamma Feed6.1
N9LHDSwitch Coy 2 M 3 Element5.0
KB6IGCStacked Mini Loops:  Nulls -5 dB4.6
W7XUBig Wheel:  Nulls -1.5 dB2.8
KB0PEStacked Halos:  Nulls -0.8 dB1.7
222 MHz CallDesignGain (dBd)
WB0TEM13 Element Yagi13.4
WG6K12 Element Yagi12.3
KB5UBE3 Element Yagi7.5
432 MHz CallDesignGain (dBd)
WA6FPX39 Element Yagi17.7
WA6FPX13 Element Yagi13.0
WG6K15 Element Quad Yagi12.7
KA2KQMCushcraft 410B 8 Element12.5
WG6K15 Element NBS Yagi10.9
WA5VJB6 ele Yagi with No Reflector f/B 26.2 dB10.7
N0QBF7 Element Gama Matched10.2
W9QXPChereiexmesng Turnstiles in Phase8.8
N9LHDSwitch Com Model Coy 4347 Element7.2
902 MHz
CallDesignGain (dBi)
WA5VJB10 ele Cushcraft PC8910N11.2
N9LHD8 ele Motorola thF700011.1
KF0OA12 ele "Mystery"7.2
WA5VJBLog Periodic6.0
1296 MHz CallDesignGain (dBi)
N0UOC2 Stacked 22el M Squared22.4
N0UOC52 ele yagi20.6
WA5VJB10 ele Yagi WA5VJB13.5
KF0OA10 ele Yagi WA5VJB13.2
2304 MHz CallDesignGain (dBi)
N9LHD36" Grid Dish RMX Feed21.5
W0AUS36" Mesh over Grid RMX feed20.5
K0GCJ24" Solid Dish RMX feed18.1
N9LHD24" Solid Dish RMX feed17.8
KK7B19" Golid Dish Fan Dipole Splash Feed12.4
K5PJR12 Turn Helix6.9
3456 MHz CallDesignGain (dBi)
N9LHD36" Grid dish RMX feed22.6
N9LHD24" Solid Dish RMX feed21.4
W0AUS36" Mesh dish RMX Feed21.2
K0GCJ24" Solid Dish RMX feed20.1
KK7B19" Solid Dish Fan Dipole/splash feed18.3
KA0YSQDN3-14 Horn8.1
5760 MHzNo Measurments - Equipment Problems
10368 MHz CallDesignGain (dBi)
WD4MUO55" Dish with IMU Feed horn34.7
WD4MUO55" Dish Flared Horn feed33.7
WD4MUO55" Dish Flared Dual Mode Feed33.6
WD4MUO55" Dish Flared Feed32.3
K0GCJ24" Dish Splash Feed #231.2
K0RZ30" Dish with Radar Test Horn feed30.5
WA8WZG32" Dish Chaparrel Super Feed29.8
K0GCJ24" Dish Splash Feed29.1
AA0BRMark Antennas D10A2429.1
K0RZ30" Dish W0PW feed27.3
W0KJY24" Dish VJB horn w/scalar ring26.0
W0KJY24" Dish VJB Horn25.6
KA0KUY18" John Deer Plow Dish with W0PW Scalar Horn Feed24.5
W0KJY24" Dish VJB flat scalar ring24.1
N0UGY12" dish WG dual dipole feed23.6
KA0KUY15" dish W0PW feed21.5
N0UGY6" X 8" Horn20.9
N9LHD24" Dish .141 Dipole feed19.5
AA0BRMicrolab 638-A20 Gain Horn19.5
N0UGY5" X 7" Horn18.9
WQ0PDBG-520 Gain Horn 4.7X3.5X10"18.3
K0RZAT 48-UP Horn 2.3X1.75X4"12.9
24192 MHzNo Measurements - Equipment Problems

Measurements were made on the 902-24GHz were made by WA5VJB.

Measurements were made on the 50 MHz - 432 MHz by WB0ETM

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