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

1998 Antenna Gain Results

Tested in Kansas City, MO, - July 24, 1998

 

50 MHz(*) Call DesignGain (dBd)
KB0PE5 element10.0
N0KE3 element8.9
WB0TEMDipole0.0
W9JNLoop-0.6
 
144 MHz Call DesignGain (dBd)
WB0TEMReference Yagi10.7
KB0HH/KA0KUY11 ele 20'12.7
W0DGY9 ele12.4
W0DGY9 ele M210.5
KA0YDuo Quad Bowtie8.5
KA9VAW5 ele7.2
N9LHD"Swieck, COY 3 ele"5.8
N0UK2 ele HB9CV5.2
KB0MNK2 x Stacked Loops5.1
WD5AGOM2 Omni1.2
WD5AGOPar Omni1.1
WD5AGOTurnstile0.0
 
222 MHz Call DesignGain (dBd)
WB0TEMReference Yagi12.7
KB0HH/KA0KUY17 ele 25' boom15.7
KA0Y2 x Loop over a ground plane8.2
 
432 MHz Call DesignGain (dBd)
KB0HH/KA0KUY40 ele 31' boom18.0
KB0HH12 ele 6' boom11.1
KB0PE11 ele 5' boom8.7
KA0YDual Quad over a Reflector7.7
WA2VOIEIA Dual Dipole7.3
WD5AGO6 ele 2.5' boom7.2
KA8SSB5 ele 1.8' boom6.6
KB0MNKDipole with corner reflector5.9
KA9VAW8 element Log Periodic5.6
WA5VJBLog Periodic4.4
KD4NOQBig Wheel-0.4
 
902 MHz Call DesignGain (dBd)
WA5VJB4 Element Yagi7.5
KB0HH/KA0KUY6ft dish with 2 element quad feed18.9
KB4NOQ18 element M2 Yagi15.3
W5KQJ16 element Yagi14.8
W9FZ10 element Cheap Yagi #112.0
W9FZ10 element Cheap Yagi #211.3
WA5VJB6 Element ModCom9.3
K0CGJ2 x 10 Turn 23cm Helix7.1
WA5VJBLog Periodic5.7
WA5VJBPrototype ZigZag Log Periodic5.3
W3IWIHeli-Bowl GPS Antenna1.0 dBic
WA5VJBMicrocell patch antenna (840 MHz)-4.5
 
1296 MHz Call DesignGain (dBd)
KB0HH/KA0KUY6 ft dish with Coffee Can feed26.3
KB0PE35 ele M2 Yagi19.0
WA5VJB10 ele Yagi13.5
KB4NOQ8 ele Cheap Yagi13.1
W9FZ10 ele Cheap Yagi #112.9
W9FZ10 ele Chap Yagi #212.8
K0GCJ2 x 10 turn Helix11.0 dBic
W3IWIHeli-Bowl9.3
WA5VJBLog Periodic8.8
W3IWI2 Turn Yogurt Feed Heli-Bowl8.7
WB5AGOSlot8.0
WA5VJBPrototype ZigZag Log Periodic8.0
 
2304 MHz Call DesignGain (dBd)
KB0HH/KA0KUY6 ft dish with Bean Can Feed36.9
KG0MWHelical Feed 3 ft Dish18.2
N4CH21 ele Loop Yagi16.6
K0GCJ"24"" dish with Tapered Helix Feed"14.2 dBic
WA5VJBNARDA Sth Gain Horn13.4
W3IWI"8"" Heli Bown"6.6 dBic
W3IWIHeli-Bowl with 2 turn Yogurt Feed6.4 dBic
WA5VJB"9x2x3.5"" Horn"5.2
W3IWIHelix Feed with Heli-Bowl ref.5.4 dBic
 
3456 MHz Call DesignGain (dBd)
KB0HH/KA0KUY6 ft dish with soup can feed37.6
WA5VJBNarada Reference Horn16.8
W3IWIHelix Feed with Heli-Bowl ref.7.7 dBic
WA5VJB"9x2x3.5"" Horn"8.7
 
5760 MHz Call DesignGain (dBd)
KB0HH/KA0KUY1.1 Meter dish with Penny Feed17.9
WA5VJBHorn Antenna Ref.15.5
W3IWIHelix Feed with Heli-Bowl ref.7.7 dBic
 
10 GHz Call DesignGain (dBd)
WD4MUO"55x24"" Eliptical Dish"34.9
W0UC"24"" dish .68 f/d"31.9
W0UC"18"" dish"29.2
WD4AEY"18"" dish"28.7
W0UC.8 Meter Offset Feet26.6
KB0HH/KA0KUY"18.5"" dish with penny feed"17.7
WA5VJBHorn17.7
N0WIYBendix 9.5 GHz Phased Array13.5
K0GCJ"24"" Dish with feedhorn"13.0
 
24 GHz Call DesignGain (dBd)
KB0HH/KA0KUY/WA5VJB"18.5"" dish with horn feed"26.8
WA5VJBHorn21.3

*Due to interference there is some uncertainty in the 50 MHz measurements.

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

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


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