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

2007 Antenna Gain Results

Tested in San Antonio, TX - July 27, 2007


No tests accomplished below 902MHz due to test equipment failure.
902 MHz CallDesignGain (dB)
WA5VJBTDJ-7500A-15 15 element Yagi14.8
WA5VJBCommercial 15 element Yagi14.2
WA5VJBCommercial 13 element Yagi13.2
WA5VJBCommercial 11 element Yagi12.1
K5VHCommercial Horn 16 x 12 x 12"10.0
NM5MCommercial 5 element Yagi9.5
WA5VJBDracom 400-1000 PCB LP5.6
WA5VJBHB - 3 High Series stack of PCB Big Wheels4.8
1296 MHz CallDesignGain (dB)
N0UK24 ele Directive Systems Loop Yagi18.4
N0OBG22 element ATV M sq Yagi17.1
N0UK14 ele Directive Systems Loop Yagi15.8
K8XKHB - 11 ele Cheap Yagi14.0
K5VH16 x 12 x12" horn13.7
WA5VJBHB - 11 ele Cheap Yagi12.8
WU8O7.5" dia can8.7
K5PJRSector Dish 23"7.7
WA5VJBDracom 400-1000 PCB LP5.3
N0OBG5 1/2 wave Mag mount vert<-15
2304 MHz CallDesignGain (dB)
K5LLL20" WiFi dish16.2
WA5VJB14 ele WiFi Yagi14.4
WA5VJB6 x 9.5" Corner Reflector11.3
2450 MHz CallDesignGain (dB)
WA5VJB14 ele WiFi Yagi14.9
K5LLL20" WiFi dish14.5
WA5VJB6 X 9.5" Corner Reflector10.6
3456 MHz CallDesignGain (dB)
WA5VJB11" dish with Vivaldi feed16.6
WA5VJB8 x 6 x 11" Avcom Horn15.5
K5VHWJ Wide band horn10.6
5760 MHz CallDesignGain (dB)
KB0PEC/HB - 34" Dish Dual band LUA Feed30.7
K5LLL24" Directive Systems dish and feed26.7
WA5VJB11.5 x 9 x 17.5" FXR Horn21.7
KA0KCIHB - 77 ele Loop Yagi21.4
WA5VJBHB - 11 Dish with Vivaldi Feed17.9
WA5VJBHB - 16 Patch array17.1
10 GHz CallDesignGain (dB)
KB0PEC/HB - 34" dish with LUA dual band feed35.8
WA5VJBC/HB - 11 inch dish with Vivaldi Feed22.4
K5GNA4.2 x 3.5 x 4" horn20.5
W0AUS5 x 4.5 x 6" horn20.2
K7ICWAT-39/AP 3.6 x 3.1 x 3" horn17.4
WA5VJBNarada Horn16.6
24 GHz CallDesignGain (dB)
WA5VJBReference Horn20.7
WA5VJBHB - 11" dish with Vivaldi Feed20.7
K5GNAHB - Musical Trumpet Horn20.1
N5YCHB - 1.6 x 1.3 x 1.2" horn18.7

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