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  • 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.

  • 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..

  • 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.

  • 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.

  • 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.

**-Central States VHF Society

Exploring the World Above 50MHz since 1965

2010 Noise Figure Results

2010 Noise Figure (NF) Results

Tested in St Louis, MO - July 23, 2010

 

50 MHzCallDesignDeviceNF (dB)Gain (dB)
N2CEIDEMIFPD7500.6219
KM0AMirageGaSaFET0.8514.6
 
144 MHzCallDesignDeviceNF (dB)Gain (dB)
W3XOHB 0.5316.3
W9SVHBMFG13020.5523
KM0AARRSP144VDG0.5724.0
W9RVGARRARR-2X0.7523.7
W9RVGARRSP144VD1.219.0
HeilParks144-15 
 
222 MHzCallDesignDeviceNF (dB)Gain (dB)
K0MHCDEMI 0.4321.8
W9SZHB 0.4521.1
N2CEIDEMIL222-280.8918.8
W9RVGARRARR-2X2.513.3
 
432 MHzCallDesignDeviceNF (dB)Gain (dB)
WD5AGOCavityATF351430.2433.3
N2CEIDEMIFPD 7500.3318
K0MHCDEMI 0.8520.6
WD0FCHDEMI#60.8519.5
WD0FCHLC#40.9514
N2CEIDEMI converterL432-28120.6
W9RVGARRMSP432VDG-1691.118.9
WD0FCHDEMI#11.116
W9SZLC 1.214
WD0FCHLC#32.314.7
W3XOLCBFR912.738
 
902 MHzCallDesignDeviceNF (dB)Gain (dB)
WD0FCHHB 0.4516.2
K0MHCDEMI 0.518.6
K4QFHBMMIC0.733.4
WD0FCH  1.321
 
1296 MHzCallDesignDeviceNF (dB)Gain (dB)
WD5AGOHB AGOMGF4919/MGA650.1540
WD5AGOAGO RefNE325/ATF2110.232.5
W9IIXAGONE325/ATF2110.2533.9
KA9VGGHB 0.2841.2
K4QFHBMMIC0.5232.2
WD0FCH  0.8418.6
K0MHCDEMIATF101362.612.1
 
2304 MHzCallDesign DeviceNF (dB)Gain (dB)
WD5AGOHB AGO RefNEC3210/MGA660.3126.2
WD5AGOHB AGOMGF4919/MGA650.3332.2
W9IIXAGONE325/ATF2110.3629.2
W9IIXAGONE325/NGA6510.3832
KA9VGGHB 0.8938
K4QFHBMMIC1.120.8
 
3456 MHzCallDesign DeviceNF (dB)Gain (dB)
WD5AGOHB AGO RefNE3210/MGA660.5825.1
KA9VGGHB 0.6831.2
 
5760 MHzCallDesign DeviceNF (dB)Gain (dB)
WD5AGOHB AGONEC3210/FHC40.7530
WD5AGOHB convFHC3.521
 
10368 MHzCallDesign DeviceNF (dB)Gain (dB)
W0FMSDEMI converter 4.120