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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

2004 Noise Figure Results

2004 Noise Figure (NF) Results

Tested in Mississauga, Ontario - July 23, 2004

 

144 MHzCallDesign DeviceNF (dB)Gain (dB)
VE3AXHBMGF1800/020.2618.98
VE3BFMDX-144 SSB Electronics? GaAsFET0.4321.3
VA3STSP144VDG ARRMGF13020.5623.69
VA3FINARR? GaAsFET0.6220.2
VA3FINPrototype? GaAsFET1.0639.5
ZL1RSEx. Sat-B InmarsatTri-stage GaAsFET1.1918.1
VE3BFMMaxi-Amp SSB Electronics? GaAsFET1.4919.2
VE3EZPParksNuvistor4.6221.2
VE3BFMMV144S SSB Electronics? GaAsFET6.217.4
 
222 MHzCallDesign DeviceNF (dB)Gain (dB)
VE3AXHBMGF13000.3719.2
W1AIMHBMGF14020.6919
VA3STDEMIMGF13020.8812
ZL1RSEx. Sat-B InmarsatTri-stage GaAsFET1.2220.1
W1AIMVanguard converter40673 FET6.064.5
K2VXOModified Tentec XVTR(144MHz)BF988?13.237.5
 
432 MHzCall DesignDeviceNF (dB)Gain (dB)
VA3FINHB? GaAsFET0.2415.6
VE3DSSSSB Electronics? GaAsFET0.2618
WB0TEMHBMGF14020.6017.2
VE3DSSHBMGF13020.6512.5
VA3KKZARRMSP-432 VDG-1600.7918.6
VE3IKVHB (measured at 439MHz)? GaAsFET0.8316.1
VA3KKZARRMSP-432 VDG-1600.8317.8
ZL1RSEx. Sat-B InmarsatTri-stage GaAsFET1.2325.1
VE3BFMSP70 SSB ElectronicsMGF1400?1.7323
 
903 MHzCall DesignDeviceNF (dB)Gain (dB)
W1AIMHB (cover off)MGF13020.7215.25
VE3DSSHBMGF13020.8318.6
ZL1RSEx. Sat-B InmarsatTri-stage GaAsFET1.5529.5
W1AIMHB (cover on)MGF13022.86.7
 
1296 MHzCall DesignDeviceNF (dB)Gain (dB)
VA3STDEMIPHEMPT ?0.3219.6
WB0TEMHBMGF14020.3912.7
WB0TEMHBNE321840.4315.6
W1AIMHBMGF1402290.4816
KO0ZDEMI kit? GaAsFET0.8915.6
ZL1RSEx. Sat-B InmarsatTri-stage GaAsFET1.7330.2
 
2400 MHzCall DesignDeviceNF (dB)Gain (dB)
N1JEZDB6NT conv. (2M IF)NE325840.6715.9
 
Bands 2304 MHz & upNo Entry

Measurements completed by: VE2UG
Equipment: HP8970B (noise figure analyzer) & HP346A (noise source)