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

2006 Antenna Gain Results

Tested in Bloomington, MN - July 28, 2006

 

144 MHz CallDesignGain (dB)**
W0VBM2 2M710.4
K0CQDir Sys NPM144-5LVA8.8
W0VB1st 5el of M2 2M28XP (vert)8.7
W0VB1st 5el of M2 2M28XP (horiz)7.7
WB5JMGHB Cu pipe "Grab 'n' Go"7.7
KF0AKHB Log PDA Sat A Ant "Eagle"7.6
KF0AKHB Log PDA Sat #2 Ant "Eagle"7.2
VE3BFM5 el LP 2m/432 RICO6.7
N0RHLHB Cut-down TV ant on sq boom6.5
KC0PNOHB measuring tape 3 el antenna5.3
K9JKDegen Design LP A210704.8
VE3BFM4 el V-LOG P Degen LPA210704.7
KD9SG5 el unk Mfg4.2
WA9HCZHB "Small" Wheel2.6
KF8QLDL4KCL 3 el LPA1.7
WB9OGMCom'l Big Wheel1.2
 
222 MHz CallDesignGain (dB)**
WB9OGMCom'l Big Wheel4.4
K9JKDegen Design LP A21070 Back Gain3.8
K9JKDegen Design LP A21070 Fwd Gain3.1
KF0AKHB Log PDA Sat A Ant "Eagle" Back Gain-0.8
KF0AKHB Log PDA Sat A Ant "Eagle" Fwd Gain-1.3
 
432 MHz CallDesignGain (dB)**
W0OZIDir SysDFSO ATV-2515.4
WA0CQGHB K1FO-style yagi15.3
KC0AKJ16el KLM12.5
WD9IVDHB 46 el 440 yagi11.8
WA0VPJPair Stacked 6 el Yagis9.0
KD9SG7 ele unk Mfr #B8.4
KD9SG7 ele unk Mfr #A8.3
KF8QLDL4KCL 4 el Yagi LPA8.0
K9KJDegen Design LP A21070 Fwd Gain7.8
KF0AKHB Log PDA Sat #2 Ant "Eagle"7.8
VE3BFMHB 5L/2 V Dipole7.8
KF0AKHB Log PDA Sat A Ant "Eagle"7.2
VE3BFM5 el LP 2m/432 RICO6.0
VE3BFM4 el V-LOG P Degen LPA210706.0
W1JRHB 3 el yagi5.6
K9JKDegen Design LP A21070 Back Gain4.8
WB9OGMcom'l Big Wheel #20.8
WA0NJFHB End feed Zepp (horiz)-14.2
 
436 MHz* CallDesignGain (dB)**
WA5VJBArrow Antenna w/8-32 nuts on elements~7.3
WA5VJBArrow Antenna w/plastic inserts on elements~7.3
WA5VJBArrow Antenna w/star washers on elements~7.1
WA5VJBArrow Antenna w/o Diplexer~7.0
WA5VJBArrow Antenna w/"torqued" elements~7.0
WA5VJBArrow Antenna w/Diplexer~4.6
 
439 MHz* CallDesignGain (dB)**
W0OZIDir Sys DSFO ATV-26~15.6
WD9IVDHB 46el 440 yagi~11.4
KD9SG7 ele unk Mfr #B~9.3
KD9SG7 ele unk Mfr #A~8.7
 
902 MHz CallDesignGain (dB)**
VE3ADQ18 el loop yagi16.4
VE3BFMHB V dipole7.8
N0LNOHB Double Diamond6.0
WA2VOITACAN ant @~20° off plane (vert)2.2
WA5VJBBig Wheel2.0
N0EVDHB 6 el back gain-13.8
N0EVDHB 6 el Fwd gain>-20
 
1296 MHz CallDesignGain (dB)**
VE3ADQHB 28 el Loop yagi20.7
W0OZI55 el Dir sys (1255)19.9
K0DASHB Coffee Can Horn10.0
N0LNOHB Double Diamond8.5
W1JRHB 3 el yagi8.1
WA2VOITACAN ant @~20° off plane (vert)4.3
VE3BFMHB V Dipole4.0
WR0I6.75 x 5 x 5.5"-6.2
 
2.3 GHz CallDesignGain (dB)**
K8EBHB 48" Dish w/Coffee Can feed (2304/3456)21.6
K3SIWHB 33" Dish w/Triband feed18.2
VE3ADQ 14.5
K0SHFHB 24" Dish14.0
WA8RJFHB 20" Dish w/Triband feed13.1
K8KXHB 25 el yagi on wood boom12.1
WB9OWNHB 12 x 12 x 10" Cu Horn on Plywood11.5
WA8RJF14 x 4.5 x 13" horn10.1
WA5VJBHB 11 el "Cheap Yagi"9.4
WR0I6.75 x 5 x 5.25"8.0
WA5VJBHB 11 el "Cheap Yagi"8.0
K0FQA6 el Slot6.5
KB0DBS4.5 x 3.74 x 3.5" Horn4.3
WB9OWNHB Coffee Can (1 lb) Horn3.2
K0DASHB Circular Horn2.6
 
3.4 GHz CallDesignGain (dB)**
K3SIW33" Dish w/Triband feed22.8
K8EB48" Dish w/Coffee Can feed (2304/3456)21.2
K1WHS112 el Loop yagi19.8
KA0KEIHB 112 el Loop yagi19.6
K0SHFHB 24"17.0
KF9QLHB 45 el Loop yagi16.1
WA8RJF20" Dia w/Triband feed15.8
K0SHFHB 24" Dish w/Triband feed13.6
WA8RJFHB 20" Dia w/Triband feed11.2
KB0DBSHB 4.5 x 3.74 x 3.5" horn8.6
WR0I6.75 x 5 x 5.25" Horn5.8
 
5.7 GHz CallDesignGain (dB)**
K8EBHB 34" Dish w/W5LUA Dual band feed30.0
WB0LJCPhillips 18" Dish27.0
K3SIWHB 33" Dish w/Triband feed26.7
W0AUSHB Sony 18" Dish offset feed24.7
W0ZQGrid Dish 12 x 16" Model HG5822G21.1
WB0DBSRibbed Horn 1.75 x 1.75 x ?" length9.5
 
10 GHz CallDesignGain (dB)**
KC0PHB Channel Master/Prime Star w/modified Chaparrel feed38.1
K8EPHB 34" Dish w/W5LUA Dual band feed36.3
K8EPHB 24" Offset Dish35.8
K3SIWHB 33" Dish with 3/4" pipe feed34.7
KF8QL24" Sheppard's Hook Feed33.2
WB0LJCHB Sony 18" Dish Dual band feed31.8
KA0KEI4.75 x 3.5 x 9.75" horn21.1
KF8QL4 x 3 x 4.5" Horn18.9
WB0LJCHB 3 x 3.75" Horn18.2
WA8RJF2.75 x 2 x 5" Horn17.6
VE3ADQFeed Horn 2.75 x 2 x 5"16.6
WB0DBS2.75 x 2 x 5" horn16.2
WB0DBS2.75 x 2 x 5" horn15.6
WA9HCZHB Modified DSS Horn13.2?
 
24 GHz CallDesignGain (dB)**
WB0DBS4 x 3.25 x 8.75" horn25.0
WB0DBS1 x 0.75 x 2" horn13.3
NE8I32 slot3.3

*Measurements at 436 & 439 MHz considered estimates due to lack of proper references
**Gain in dB based on difference from reference antennas


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