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

2007 Noise Figure (NF) Results

Tested in San Antonio, TX - July 26, 2007


50 MHzCallDesign DeviceNF (dB)Gain (dB)
VE3ADQMinicircuitsMCL ZFL-10006.7119.3
144 MHzCallDesign DeviceNF (dB)Gain (dB)
W0ZQARR 0.6725.6
222 MHz – none tested
432 MHzCallDesign DeviceNF (dB)Gain (dB)
WD5AGOHBATF 331430.4118.4
K5QEAGOATF 341430.422
K5PJRCommercial SSB LNA0.4620.7
VE3ADQARRP432VD #11.9715.6
902/903 MHzCallDesign DeviceNF (dB)Gain (dB)
VE3ADQMinicircuitsMCL ZFL-10006.5519.2
1296 MHzCallDesign DeviceNF (dB)Gain (dB)
K6MYCAGO-2-23CM 0.1832.8
K6MYCW6HD 0.2719.4
WB2BYPDEMI 0.3418.7
W0ZQDEMI 0.4518.4
2304 MHzCallDesign DeviceNF (dB)Gain (dB)
WD5AGOAGO36077/ATF 211860.3528.45
WD5AGOAGONE3210/ATF 211860.3625.47
WD5AGOAGO/LUA36077/MGA 615630.4429.9
K5QEDEMI 13ULNA 0.4818.7
K5QEDEMI 13ULNASN57200.4817.7
3400 MHzCallDesign DeviceNF (dB)Gain (dB)
G4DDKHBATF 360770.8239.30
3456 MHz – none tested
5760 MHzCallDesign DeviceNF (dB)Gain (dB)
WD5AGOAGOATF 36077/FSCM1.0628.4
WD5AGOLUAATF 360771.3610.4
10368 MHz – none tested
24192 MHzCallDesign DeviceNF (dB)Gain (dB)
W4EFZDB6NT 3.1224

Testing by: W5LUA, WD5AGO and WA8RJF
Equipment: HP 8970B and AIL 2075 supplied by Avago Technologies, W5LUA and WD5AGO
Measurement Accuracy +/- 0.2 dB at 10 GHz and below

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