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

2008 Antenna Gain Results

Tested in Wichita, KS - July 25, 2008


144 MHz CallDesignGain (dBd)
WA2VOI4 Element "Cheap Yagi"7.8
WA5VJB5 inch DDRR-6.9
WA5VJB0.1" x 3" DDRR-20
222 MHz CallDesignGain (dBd)
W9WA13 foot 12 Element Yagi12.8
WD5AGO13 foot 12 Element Yagi12.8
W0ZQ5 foot 8 Element Yagi11.0
WA2VOI4 Element "Cheap Yagi"7.8
432 MHz CallDesignGain (dBd)
WA9KRT16.5 ft 23 Element Yagi15.6
WA9KRT16.5 ft 23 Element Yagi #215.2
KA2KQM432 RIW14.7
KA2KQM10 element Corner Reflector 4-10B11.2
WA2VOI2 foot 6 element "Cheap Yagi"9.0
WA5VJBModified 2 Element 460/432 PCB Yagi2.0
KC9BIEM Squared Stacked HiQ Loops1.4
KC9BIEK5VH Super Wheel1.3
WA5VJB2 Element 460 MHz PCB Yagi1.3
KC9BIEK5VH Super Wheel #20.3
902 MHz CallDesignGain (dBi)
WA5VJBWA5VJB Design 20 element 900-930 MHz Yagi16.7
WA5VJBCommercial LP Reference Antenna5.5
WA5VJBLog Element from Cell Phone tower5.2
WA5VJBStacked PCB Big Wheels2.3
KA9UVYOAL Big Wheel #11.1
KA9UVYOAL Big Wheel #20.3
1296 MHz CallDesignGain (dBi)
K0PFXHB 22 element Loop Yagi17.6
WQ0P35 element M squared July 7th mod17.1
WA2VOIHB Split Parabolid13.1
WD5AGOHybrid Feed (.76l Round w/scalar) 8.2 dBiC
5.6 H (Hybrid #1)
7.9 V (Hybrid #1)
8.2 H (Hybrid #2)
4.8 V (Hybrid #2)
K8EBHB Septum Feed (Square, 4 step) 6.9 dBiC
6.9 H (TX Port)
4.7 V (TX Port)
6.6 H (Rcv Port)
5.4 V (Rcv Port)
WB9PNUHB Septum Feed (Square, 4 step) 6.8 dBiC
6.8 H (TX Port)
5.9 V (TX Port)
6.6 H (Rcv Port)
6.7 V (Rcv Port)
K9JKHB 4 Element 144/432 MHz Herringbone LP, Degen Design LP-A210705.4
WA5VJBReference Antenna5.0
KF8QLDecibel 806-1998 MHz Ceiling Antenna3.1
KA9UVYOAL Big Wheel1.8
2304 MHz CallDesignGain (dBi)
WA5VJBHB 16 inch dish with Vivaldi 5-20 GHz Feed16.4
W9IIX28 el Loop Yagi15.8
W0AUSRidged Horn13.0
WA5VJBReference Horn12.4
VE3BFMCenturion CAF959988.2
WD5AGOHB Septum Feed (Round 0.8l 5-Step) 5.4 dBiC
5.4 H (TX Port)
6.1 V (TX Port)
4.4 H (Rcv Port)
5.4 V (Rcv Port)
VE3BFMBroadband PCB Monopole0.5
2425 MHz CallDesignGain (dBi)
WA5VJBHB 16 inch dish with Vivaldi 5-20 GHz Feed15.7
KD9SGCisco System Yagi13.9
W0AUSRidged Horn13.8
WA5VJBReference Horn13.1
AF8ZMT347015 With Ground Plane7.6
3400 MHz CallDesignGain (dBi)
WA5VJBReferance Antenna15.7
WD5AGOHB Septum Feed (Round 0.8l 5-Step) 7.4 dBiC
7.2 V (TX Port)
5.9 H (TX Port)
5.7 V (Rcv Port)
6.2 H (Rcv Port)
WD5AGOIMU Polarizer (0.69l) 7.4 dBiC
7.2 V (TX Port)
2.9 H (TX Port)
6.1 V (Rcv Port)
4.1 H (Rcv Port)
3456 MHz CallDesignGain (dBi)
W0AUSRidged Horn19.2
WA5VJBHB 16" dish w/Vivaldi 5-20 GHz Feed17.4
WA5VJBReference Horn15.9
4950 MHz CallDesignGain (dBi)
WA5VJBHB 16" dish w/Vivaldi 5-20 GHz Feed22.7
AF8Z8 Patch Array Ant "A"15.5
WA5VJBReference Horn14.7
AF8Z8 Patch Array Ant "B"14.2
AF8Z8 Patch Array Ant "C"6.9
5400 MHz CallDesignGain (dBi)
WA5VJBReference Horn15.8
AF8Z8 Patch Array Ant "B"15.2
AF8Z8 Patch Array Ant "C"9.7
AF8Z8 Patch Array4.8
5760 MHz CallDesignGain (dBi)
KB0PEHB 35" dish w/Dual band feed32.2
WA5VJBHB 16" dish w/Vivaldi 5-20 GHz Feed27.9
KF8QLHB 2' dish w/5GHz offset feed27.7
WA5VJBReference Horn22.2
AF8ZMT485028 64 el patch array21.7
W0AUSRidged Horn19.2
WA5VJBReference Horn #215.7
AF8Z8 Patch Array Ant "C"13.2
WD5AGOHB Septum Feed (Round 0.73l 5-Step) 12.6 dBiC
12.0 V (Port 1)
12.7 H (Port 1)
12.4 V (Port 2)
11.7 H (Port 2)
AF8ZMT482015 Gain Vertical9.7
AF8Z8 Patch Array Ant "B"6.2
AF8Z8 Patch Array Ant "A"5.7
9.3 GHz CallDesignGain (dBi)
N0OBGSectored Horn Radar Antenna28.0
WA5VJBReference Horn22.8
10 GHz CallDesignGain (dBi)
KB0PE35" dish w/Dual Band feed37.1
KF8QL2' dish w/Sheppard"s hook feed33.6
KF8QLHB 2' dish w/5-10 GHz dual band feed26.2
WA5VJBReference Horn23.6
N0OBGHorn Antenna20.1
KF8QL"H-plane" Sector Horn16.4
VE3ADQHB 3 / 4" Cu pipe feed9.6
VE3ADQHB 3 / 4" Cu pipe Chaparral feed5.8
N0OBG7' length 9.3 GHz Radar Antenna<-10
24 GHz - no entries for this band in 2008

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