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

2004 Antenna Gain Results

Tested in Mississauga, Ontario - July 23, 2004


50 MHz CallDesignGain (dBd)
VE3CRU4 ele Maple Leaf Comms VE3BFM design yagi, 13' boom8.8
VE3BFM3 ele Maple Leaf Comms reference yagi5.8
VA3FIN5 ele mod'd ch.2 tv yagi, 15' boom4.2
VE3OIL2 ele (driver + reflector) HB yagi, 2' boom2.7
VE3BFM24” dipole, unmatched, field test dipole-12.4
144 MHz CallDesignGain (dBd)
VE3CVS2 x 3 ele Degen Designs V-Wave 1½-wave V, 45” boom11.2
VE3DNR2 x 4 ele HB lemniscate ‘double loop‘ yagis9.7
VE3DNR4 ele HB lemniscate ‘loop yagi’, 5' boom9.3
VE3DNRsame antenna w/impedance match change9.2
VE3HLS8 ele HB VE3BFM design yagi, 10' boom9.2
VE3OIL6 ele HB yagi, 8' boom8.8
VA3FIN9 ele HB yagi, 12' boom, w/10’ LMR1958.7
VE3OIL12 ele HB yagi, 16' boom8.6
VE3SMA5 ele HB yagi, 5.5' boom7.5
VE3BFM4 ele Cushcraft 124WB ref. gain yagi (matched)7.1
VE3DNR4 ele Cushcraft 124WB yagi, 4' boom, factory settings6.9
VE3SMA3 ele HB yagi, 18” boom3.9
VE3OIL6 ele HB yagi, 6' boom3.6
VE3HLSPar Omni-0.7
VE3LLLHB J-pole #1, feed reversed (tested at 6' high)-2.8
VE3LLLHB J-pole #1, normal feed (tested at 6' high)-3.2
222 MHz CallDesignGain (dBd)
VE3OIL15 ele HB K1FO yagi, 16' boom, 15' RG5811.2
VA3FIN13 ele HB yagi, 12' boom11.1
VE3BFMmod'd 12 ele Lindsay ch.13 tv yagi10.7
VE3OIL9 ele HB yagi, 8' metal boom10.6
VE3CRU16 ele HB K1FO yagi, up 7' on vehicle8.6
VE3DSS15 ele Telrex yagi, 22' boom (220MHz design)8.4
VE3OIL9 ele HB yagi, 8' wood boom7.4
VE3SMA6 ele HB yagi, 4' boom6.4
VE3OIL10 ele HB yagi, 8' boom6.2
VE3BFM3 ele Sinclabs yagi - ref gain ant6.0
VE3HHT3 ele HB yagi, 3' boom5.0
K2VXOMod'd big wheel omni (3.2dB min:max ratio)0.7
432 MHz CallDesignGain (dBd)
VE3BFM16 ele DL6WU design yagi, 12' boom, ref gain ant14.3
VE3OIL18 ele Para Beam J-beam yagi, 9' boom13.2
VE3SMA10 ele HB yagi, 5.5' boom11.9
VE3OIL14 ele HB yagi, 8' boom10.6
VE3OIL10 ele HB quagi, 7' boom10.0
VE3OIL28 ele HB yagi, 20' boom8.1
VE3EU9 ele DJ4SO yagi, 5' boom7.3
VE3JAT2 x 8-ele HB crossed yagis, RHCP, 4' boom6.8
902 MHz CallDesignGain (dBi)
VE3OIL18 ele Loop Yagi. 6' boom17.2
VE3BFM11 ele Sinclabs SUY89012 Yagi - ref gain ant13.7
VE3BFM11 ele Loop Yagi12.9
VE3BFM6 ele Disk Yagi made from CDs10.2
VE3BFM400-1000 MHz WA5VJB PCB Log Periodic, w/parasitic reflector6.0
W2EVTelcom 201032 Log Periodic3.0
1296 MHz CallDesignGain (dBi)
KO0Z55 ele Directive Systems Loop Yagi19.6
VA3ST27 ele HB Loop Yagi14.8
VE3OIL23 ele Fleamarket Loop Yagi13.0
VE3TFU23 ele HB Loop Yagi11.5
VE3OIL45 ele Fleamarket Loop Yagi (1269 version)10.0
VE3SMA15 ele HB Quagi10.0
VE3SYKHB 3 lb Coffee Can Horn7.8
VE3OIL45 ele Fleamarket Loop Yagi7.0
W2EVTelcom 201032 Log Periodic - ref gain ant7.0
VE3SYKHorn made from two 3lb Coffee Cans2.5
VE3OIL31 ele HB Loop Yagi-0.2
2304 MHz CallDesignGain (dBi)
VE3OIL41 ele Directive Systems Loop Yagi21.1
W1AIM21 ele Directive Systems Loop Yagi19.1
VE3KSK16 turn G3RUH Helix, ~15.0 dBic13.2v/11.0h
VE3BFM4.25” x 5.87” Horn - ref gain ant11.0
W2EVTelcom 201032 Log Periodic9.0
VE3OIL6”w x 3”h HB Corner Reflector w/10’ of RG583.5
2401 MHz CallDesignGain (dBi)
VE3KSK15 turn G3RUH Helix, ~17.2 dBic14.4v/14.0h
3456 MHz CallDesignGain (dBi)
K1WHS112 ele Directive Systems Loop Yagi, 12’ boom24.0
W1AIM45 element Directive Systems Loop Yagi19.0
N4HY45 element Directive Systems Loop Yagi18.7
VE3SMA15 ele HB Quagi16.3
W1AIMSeavey Eng SGA-500 Horn15.0
W1GHZMCS J-386 Std. Gain Horn - ref gain ant14.5
VE3OIL38 ele HB yagi mounted on foam insulation10.5
W2EVTelcom 201032 Log Periodic9.5
5760 MHz CallDesignGain (dBi)
W1AIMSeavey Eng SGA-50 Std. Gain Horn19.1
W1GHZMCS J-386 Std. Gain Horn - ref gain ant16.8
VE3SMAHB Galvanized Horn14.3
VE3KSK1.5” Copper Circular Horn #18.6
W2EVTelcom 201032 Log Periodic8.0
VE3KSK1.5” Copper Circular Horn #27.5
10 GHz CallDesignGain (dBi)
W9FZ2' dish w/VE4MA feed28.2
W9FZ9x12x16” horn, peak signal off boresight20.7
WA2VOIMicrowave Associates Gunnplexer horn17.3
WA2VOIMicrowave Associates Gunnplexer horn - ref gain ant17.3
K0KFCW1GHZ Dual 10/24 GHz feed w/1.75” dia conical horn9.9
W0AUS1 x 1.25 x 0.375” Horn9.5
WA5VJBW1GHZ Dual 10/24 GHz feed w/1.5” dia conical horn8.7

Test distance for 50-432MHz was 37m (121 feet).
Test distance for 900-10368MHz was 30.5m (100 feet).

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