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

2009 Antenna Gain Results

Tested in Chicago, IL - July 24, 2009

 

144 MHzCallDesignGain (dBd)
W0FYHB (Cushcraft derived)14.7
K9GYArrow 4 element8.4
N5VYNArrow 144/432 MHz5.9
N0UUHB Moxon4.7
W0FMSHB 2 element Moxon3.5
KC9QJ-Pole3.0
VE3BFMStacked H-OCF-omni-0.6
VE3BFMHorizontal OCF-omni-1.1
 
222 MHzCallDesignGain (dBd)
N9GH10 element HB11.5
N0EDV6 element HB9.6
AB9OU6 element Log Periodic7.1
K9GYM2 Loop1.8
 
432 MHzCallDesignGain (dBd)
K3IWK27 element HB yagi16.2
W0FY16 element KLM15.8
K3IWK22 element HB yagi14.9
WA9KRT23 element VE7BQH HB yagi14.8
K9SRB12 element HB yagi, 439 MHz13.3
N9GH16 element HB plumbers delight11.4
AB9OU14 element KLM11.1
K9SRB11 element wood boom HB 439 MHz yagi10.8
N0EDV11 element WA5VJB HB yagi8.3
N5VYN7 element ARROW yagi8.2
AB9OU6 element HB yagi8.2
WB9IDDQuad loop0.3
 
902 MHzCallDesignGain (dBi)
WA9FIH23 element F9FT yagi18.3
AB9OU23 element F9FT yagi14.9
AB9OU7 element SCALA yagi11.4
N9LHD6 element yagi10.9
WA5VJBSINCLABS SUY-890109.7
N9LHD8 element MOTOROLA yagi9.0
W9XA6 element MAXRAD yagi8.2
WB0DBSEMCO 3115 double ridge horn5.7
 
1296 MHzCallDesignGain (dBi)
WA9FIH24 element HB LP yagi17.2
WA9FIH15 element KLM yagi17.0
AB9OU24 element HB LP yagi16.4
K0PFX24 element K1FO LP yagi16.0
WA5VJBReference Horn12.1 **
W0FMSPatch antenna9.4
WB0DBSEMCO 3115 double ridge horn9.0
W9XACross feed Horn8.8
 
2304 MHzCallDesignGain (dBi)
KB0PE4 foot dish, WA5VJB feed20.2
N9LHDSA 12-1.718.4
N9LHD8 x 6.75 x 11.75 horn13.5
N9LHDMaxrad Z65112.6
N9LHD7.5 x 5.0 x 9.5 ridged horn12.4
WA5VJBScientific Atlanta Reference Horn12.4 **
N9LHDMaxrad Z65112.3
N9LHDPC-2415N12.2
WB0DBSEMCO 3115 Double ridge horn12.0
W0FYHyperlink HG2415y10.0
VE3ADGPatch linear8.0
 
2405 MHzCallDesignGain (dBi)
WA5VJBScientific Atlanta Reference Horn12.9 **
W0FYHyperlink HG2415Y11.1
W0FMSCircular patch8.4
W0FMSCircular patch5.7
 
3456 MHzCallDesignGain (dBi)
KB0PE4 foot dish with WA5VJB feed34.5
N9LHD8.0 x 6.75 x 11.75 horn16.0
WA5VJBScientific Atlanta Reference Horn15.5 **
N9LHDNarda 64313.5
N9LHDNarda 64313.3
N9LHDRidged horn12.9
WB0DBSEMCO 3115 double ridge horn9.9
 
4950 MHzCallDesignGain (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
 
5760 MHzCallDesignGain (dBi)
KB0PE4 foot dish with WA5VJB feed38.5
KB0PE35 inch dish with dual W5LUA feed29.0
KB0PE39 x 29 inch dish with W5LUA feed26.2
KF8QL18 X 24 inch dish with W5LUA feed25.0
WA5VJBFXR Reference Horn22.1 **
N9LHD7.5 x 5.0 x 9.5 ridged horn16.5
N9LHDNarda 641 horn16.0
N9LHD3.5 x 2.75 x 5.5 horn13.0
WB0DBSEMCO 3115 double ridge horn12.9
WA2VOI2.37 x 1.25 x 2.0 horn9.8
 
10 GHzCallDesignGain (dBi)
KB0PE35 inch dish with W5LUA feed39.2
W9ZIH4 foot dish with scalar feed37.6
KB0PE4 foot dish with WA5VJB feed35.6
WB9PNU20 inch DSS dish35.1
N2CEI2 foot ENDWAVE FF10-25HPA35.1
WB9PNU2 foot MACOM with button hook feed34.6
K0PFX18 inch DSS dish, modified feed32.5
KB0PE20 inch dish, modified feed32.4
WA9O18 inch DSS dish, HB feed horn31.9
KF8QL18 x 24 inch with W5LUA feed31.6
KB0PE20 inch dish with modified feed30.8
KB0PE39 x 29 inch dish with W5LUA feed27.1
AF4JF12 inch dish with yagi feed25.8
WA5VJBScientific Atlanta Std Gain Horn23.6 **
K0CQ5.25 x 6 x 12.5 horn23.2
WA2VOI8.25 x 5.5 x 10 horn22.3
WA2VOI5 x 4 x 6 horn21.7
N9LHDAT-39 horn 3.5 x 3 x 319.7
N9LHDNarda 641 horn19.0
K0CQ12 inch COLLINS slot-plate array17.8
WB0DBSEMCO 3115 double ridge horn15.1
N9LHD7.5 x 5 x 9.5 ridged horn14.6
K0CQ12 inch Poly Rod array14.1

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