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

1996 Noise Figure (NF) Results

Tested in Bloomington, Minnesota - 26 July 1996

 

50 MHzCallDesign DeviceInput NetworkNF (dB)Gain (dB)
K0GJXARRGASFET .6524.48
K0GJXARRFET 116.48
KB0PEOWNRCA 40841TAPPED L3.2614
N9OOMILLEN92101 w/6AK5LC7.313
N0AKCDEMATF 7.96.4
KE9QTARRL HDBKMRF966 15.47.9
 
144 MHzCallDesign DeviceInput NetworkNF (dB)Gain (dB)
KH6CP/1KH6CP/1MGF18011/2" HL.2124
WA5VJBHBCAVITY .2221.4
WA8WZGHBMGF1302 .2422
WA8WZGHBMGF1302 .2525
N9MKC   .2722.3
N0AKCMCMMGF1302 .2823
KD0DWSSBLNA145 (B2) .2819.65
K9PWHBMRF966 .3418.2
N0AKCMCMMGF1302 .3524
N0AKCWA5VJBMGF1302 .3824.3
WQ0PAGOMGF13021/2WAVE CAVITY.422
W9HLYVE7BQHMGF1302 .522.9
N0NASARRGASFETSP144VDG.5223.6
KD0DWSSBLNA145 .5313.8
K9CAAR2MGF1302 .622.1
K9CAK9CA#2ATF13284 .7819.4
WQ0PHBMGF1302LC.8216.3
WQ0PHBMGF1302LC.9713.5
K5LLLDEMATF10135 1.3613.7
K2VXOMIRAGEB3016 3.361.8
WA0RSEMIRAGEB-34-G 6.2215.8
 
222 MHzCallDesign DeviceInput NetworkNF (dB)Gain (dB)
KH6CP/1KH6CP/1NGF1801 .1222.31
WA5VJBHBMGF1801TAPPED L.1719.43
KH6CP/1HBMGF1801LC.2122.4
WA5VJBHBMGF1801LC.2720
N0JCFDEMATF10136LC.6618.4
N0AKCMCMMGF1302LC.8716.4
 
432 MHzCall DesignDeviceInput NetworkNF (dB)Gain (dB)
N0ISHBMGF1402Cavity.321
KA0RYTWD5AGOGASFET .3419
W9QXPHBATF10136x2Helical Resonator.427.2
W9QXPHBATF10136x2Helical Resonator.427
N9MKC???.4723.4
W9QXPHBATF35176/10136Microstrip.4935
WA8WZGMCMMGF1302L/C.5320.6
W9QXPHBATF10136x2Helical Resonator.5825.6
WQ0PHBMGF1302LC.6817.5
K0GJXARRGASFET 1.0318.6
N0NASTOKYO HRA-7  1.1420.8
WA0RSESSBSP-70 1.1417.4
KE8TRMIRAGEGASFET 1.4213.5
N4PZ???1.87.4
WA0RSERFC4-110 2.5810.4
 
902 MHzCall DesignDeviceInput NetworkNF (dB)Gain (dB)
KH6CP/1KH6CP/1NE32684ALC.3215.6
KH6CPHBNEC32684LC.3315.5
WA2VOI/0DEM  .3717.2
WB5IGFHBATF10135LC.5318.5
KH6CP/1KH6CP/1ATF1013640MHz BW FILTER.9618.75
KE9QTDEMATF10136 1.117.2
N0AKCMCMMGF1302 1.3513.57
KE9QTDEMMAR-6XVTR -144 IF2.7818.7
WB9SNRDEMMAR-6XVTR-144 IF3.6618.7
 
1296 MHzCall DesignDeviceInput NetworkNF (dB)Gain (dB)
WA8WZGAGO LC.2624
KH6CP/1KH6CP/1NE32684A .3518.2
KA0RYTDEMHEMT .415.3
WA9FWD MGF1412CAVITY.514
KB0PYODEM  .7214.1
WA8WZGHBMGF4314LC.9214.8
WQ0PLUA NO TUNEATF10135 .9214.3
WA9ACISWAGER INC  .9743.8
N0EOQ   1.0112.6
N0AKCMCMHEMTLC1.729.7
WB9SNRDEMATF10135XVRTR 144 IF2.0221.6
 
2304 MHzCall DesignDeviceInput NetworkNF (dB)Gain (dB)
KH6CP/1HBATF36077Wire Inductor.316.7
KH6CP/1HBATF36077Wire Inductor.3317.6
KH6CP/1HBNE32684AWire Inductor.3516.3
WB5LUAHBATF36077Wire Inductor.416.8
WB5LUAHBATF36077Microstrip PCB.4316
WB5LUAHB/LUAATF36077Microstrip PCB.4517.25
N2CEIHB/LUAATF36077DEM Enclosure.5217.6
WB5LUAHBATF10135Microstrip PCB.5813.6
WB5LUAHBATF36163Microstrip FR4 PCB.817.02
WA0RSESSBUEK-2000SAT 1.0732.3
 
3456 MHzCall DesignDeviceInput NetworkNF (dB)Gain (dB)
KH6CP/1HBNE32684AWire Inductor.512.75
WB5LUAHBATF36077/10136Wire Inductor.6227.3
WB5LUAHBATF36077Wire Inductor/PCB.6213.5
WA8WZGHB/LUAATF10135x2Microstrip.6525
WB5LUAHarrisTVRO LNAtuned to 4 GHz1.6632.4
WA9OHBATF10135x2Transverter1.7520.5
KH6CP/1HBMGA86576Transverter1.815
WB5LUAHBMGA86563 MMICFR-4 Microstrip2.115.2
WB0LJCComm?Avantek3.2527.6
 
5760 MHzCall DesignDeviceInput NetworkNF (dB)Gain (dB)
WA0BWEHB/LUAATF36077Microstrip.6211.3
KH6CP/1HBNE32684Microstrip.6413.2
WB5LUAHBATF36077Microstrip.7313
WB5LUAHBATF-36077Microstrip.7412.3
WB5LUAHBATF36077DEM enclosure.7511.7
WA0BWEHB/LUAATF10136x2Microstrip1.214
WA8WZGHBATF10136Microstrip1.818.9
WA9OHB Transverter2.4515
WB5LUAHBATF10135x2Transverter2.822.9
WB0LJCComm?Avantek SA84-07503.827.1
WA0BWEHBMGA64135Microstrip8.17.2
 
10368 MHzCall DesignDeviceInput NetworkNF (dB)Gain (dB)
KH6CP/1HBNE329Microstrip.6211.74
KH6CP/1HBNE329Microstrip.6313.5
KH6CP/1HBNEC32684AMicrostrip.6912
KH6CP/1KH6CP/1NE32984/ATF13135/13735Microstrip.7326.4
WB5LUAHB/LUAATF36077x2Microstrip.7522.5
KH6CP/1HBNE32684AMicrostrip.7712.4
WB5LUAHBATF3616312 GHz Microstrip.8610.3
WA8WZGHB/LUAATF13135x2Mircrostrip1.7517.9
WA9OHB/LUAAT13135Microstrip2.217

Tested by WB5LUA, WA8WZG, WB5IGF, WA2VOI, K9PW, N0ATV, K0JO
HP346A Noise Source, Measurement Accuracy of system according to HP is +/- 0.2 dB!


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