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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

2000 Noise Figure Results

2000 Noise Figure (NF) Results

Tested in Winnipeg, Manitoba, Canada - July 21, 2000

 

50 MHzCallDesign DeviceNF (dB)Gain (dB)
N0AKCDEMI 0.5618.7
WA5VJBWA5VJBMGF18010.1621.9
N0AKCWA5VJB DEADDEAD
 
144 MHzCallDesign DeviceNF (dB)Gain (dB)
KA0RYTCAVITYATF331430.1330.2
K5JLL/C INPUTMGF18010.1523.7
WD5AGOAGO L/C INPUTATF331430.1723.75
VE7BQHL/C INPUTMGF18010.1920.6
VE7BQHCAVITYATF331430.2125.4
WD5AGOCAVITYATF331430.2421.9
W7CS#2MGF13020.2923.7
W7CS#5MGF13020.3423.2
W7CS#4MGF13020.3524.5
W7CS#3MGF13020.2724.1
K6LEW MGF13020.5220
W7CS#1MGF13020.5824
VE3AXL/C INPUTMGF13020.99.6
K0AWUARRMGF13020.9719.5
KA2KQMMMIC?? 5.4723.32
 
222 MHzCallDesign DeviceNF (dB)Gain (dB)
WA4NJP MGF13020.2521.7
WA4NJPLCMGF13020.321.1
KA0Y MGF14020.3122.3
WB0OAJ MGF11000.4618.7
VE3AX MGF12000.4620.3
K6LEW MGF13020.5123.3
 
432 MHzCall DesignDeviceNF (dB)Gain (dB)
KA0RYTRYT CAVITYATF101360.1226.94
K5JLCAVITYATF101360.1820.75
K5JLCAVITYATF101360.2919.4
WD5AGOL/CATF341430.318.22
N0ISCAVITYMGF13020.320.5
KA0RYTCAVITYATF101360.325.5
WD5AGOAGOATF341430.3219.7
K0AWUARRMGF14020.7917.5
WB0OAJL/CMGF11000.8315.4
KA0Y1980 Vintage LNAD4320.9315.6
K6LEW MGF13021.0214.9
KA0YL/CMGF13021.1615.8
KA0Y MGF14022.222.2
KB0OBT MGF14022.759.1
 
902 MHzCall DesignDeviceNF (dB)Gain (dB)
W0FMSDEMI XVTRATF101361.4520
KA2KQMA-965Avantek3.119.4
 
1296 MHzCall DesignDeviceNF (dB)Gain (dB)
W7QX(1296-39) 0.2223.03
KA0YKB2AHFHX35LG0.2219.53
K5JLW7CNKATF360770.2218.43
WA4NJPAGO 0.2820.18
VE3AXAGO 0.3215.22
W7CSAGO1 0.4630.14
W7CSAGO3 0.5728.57
AL7EB1420 MHz LNA 0.630.51
W7CSAGO2 0.6814.14
W7QX2 STAGE0.7610.63
W7QX1296-2 0.814.31
AL7EBDEM xvrtr 1.1912.84
KA2KQMA-965 0.8214.69
KA0YParabolic xvrtr 1.1912.84
 
1420 MHzCall DesignDeviceNF (dB)Gain (dB)
AL7EBLNA 0.331.08
AL7EBconverter 1.8836.7
 
2304 MHzCall DesignDeviceNF (dB)Gain (dB)
N0ISDEMI 0.3518.21
KA2KQMA-965Avantek3.0318.94
KA2KQMH783 AMPAvantek3.518.5
N2CEIDEMI 2400 MHz Converter 0.821.6
 
10368 MHzCall DesignDeviceNF (dB)Gain (dB)
AL7EBDB6NT 0.7823.38
K1RQGConverted DBS LNA 1.0623.78

Tested by W5LUA, N5QGH, WA8WZG, KA0RYT, N2CEI
Equipment supplied by Agilent Technologies by W5LUA and VA6BB (Bohdan Berestiansky)
HP346A Noise Source, Measurement Accuracy of system according to HP is +/- 0.2 dB!