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

2016 Antenna Gain Results

Tested in Rochester Minnesota - July 29, 2016

VHF Range conducted by WB0TEM
Microwave Range conducted by WA5VJB

144 MHzCallDesignGain (dBd)
NG9K9 ele 214 FM Mod12.5
WB0TEMReference Yagi12.3
VE3WY7 ele Loop Yagi11.7
WB8TFH9 ele Yagi11.3
K8FYU5 ele 10.5 ft Plus MAX9.6
W0PPF6 ele Quagi, 8' boom9.6
KC0P8 ele Cheap yagi9.5
VE3ADQ5 ele LFA8.8
VE3ADQ5 ele LFA #28.8
NG9K10 ele Cushcraft 214 MOD8.7
NG9K6 ele Half Mod KLM yagi6.7
N0SPN4 ele with HB diplexer4.7
KE0FMX3 ele HB Tape yagi2.9
222 MHzCallDesignGain (dBd)
W0PPF10 ele Quagi11.5
KC0P8 ele Quagi10.5
KC0P6 ele Quagi--
432 MHzCallDesignGain (dBd)
WB9TFH14 ele Quagi12.5
W0PPF8 ele Quagi10.1
W0PPF12 ele Quagi8.8
N0UK8 ele yagi8.5
KC0P8 ele N6NB8.4
902 MHzCallDesignGain (dBi)
WA5VJBReference Horn9.1dBi
N0LNO11 ele Yagi12.9
WA5VJB6 ele Yagi10.7
K0DAS14 ele Yagi10.2
K0CQHB Log Periodic5.0
915 MHz   
N0LNO11 ele Yagi13.9
K0DAS14 ele Yagi9.5
K0CQHB Log Periodic5.5
1296 MHzCallDesignGain (dBi)
WA5VJBReference Horn12.0dBi
K5PJR24 ele Yagi17.0
W0STV16 ele Yagi16.3
VE3ADQ35 ele Yagi12.1
K0CQHB Log Periodic5.2
2304 MHzCallDesignGain (dBi)
WA5VJBReference Horn12.4
W0STVLong John X242716.9
W0STVS Band 21R16.8
KC0P21 ele Looper9.0
2350 MHz   
WA5VJBReference Horn13.1
W0STVLong John X242718.5
W0STVS Band 21R18.3
3456 MHzCallDesignGain (dBi)
WA5VJBReference Horn16.0
5760 MHzCallDesignGain (dBi)
WA5VJBReference Horn22.1
W0UC2ft dish17.3
10 GHzCallDesignGain (dBi)
WA5VJBReference Horn22.5
KA9VVQ18" DSS dish HB horn feed34.2
KA9VDU18" DSS Dish HB horn feed33.7
N0UK5" x 5" x 10" Horn21.8
K5PJR5.2" x 5.0" x 8.0" Horn20.8
K8TB2" x 2.4" x 4" Horn16.7
24 GHzCallDesignGain (dBi)
WA5VJBReference Horn22.4
WB0LJC11.5" Dish34.0
AA9IL11.0" Dish33.5
47 GHzCallDesignGain (dBi)
WA5VJBReference Horn26.3
AA9IL10" Lens Horn40.5

Test distance for 50-432MHz was .
Test distance for 900-10368MHz was .

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