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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

1995 Noise Figure Results

1995 Noise Figure (NF) Results

Tested in Colorado Springs - 28 July 1995

 

144 MHzCallDesign DeviceInput NetworkNF (dB)Gain (dB)
WA5VJBHBMGF1801TAPPED L.2114
WA8WZGMCMAT8250LC.2222
K7CAMCMMGF1302 .2323.6
WA8WZGHBMGF1302LC.2422
WA5VJBHBMGF2116CAVITY.2522.7
AA4FQHBMGF1302LC.2622.8
WA5VJBHBMGF2116CAVITY.2618.3
VE7BQHHB CAVITY.3421
VE7BQHHB LC.3525.5
KH6CPHBMGF1801LC.4116.11
KN4SMSSBLNA145LC.4519.56
N0JEQARRMGF1302LC.6125.3
N5SVPCOMM LC.6319.3
W0PPFHBMGF1202LC.7518
W0PPFHBMGF1302LC.7519.2
KB5ZUDHBMGF1302LC.7821.4
WQ0PHBMGF1302LC.8517.69
N0AKCHBMGF1302LC.921.7
K0FQAHBNE251 1.0531.4
WA0BWEARR  1.7723.6
KN4SMRFC2-317BRICK1.8215.7
WB5LUAHBINA51LC1.9922.7
WW4TICOM LC2.0521.7
WB5LUAHBINA30 MMICLC2.5220.1
WB5LUAHB2-INA30 MMICLC3.0344.7
 
222 MHzCallDesign DeviceInput NetworkNF (dB)Gain (dB)
KH6CP/1HBMGF1801LC.2122.4
WA5VJBHBMGF1801LC.2720
N0HJCARR LC.8522.7
KB6IGCSSB LC.8823.3
WA0BWESSB LC.9125.8
 
432 MHzCall DesignDeviceInput NetworkNF (dB)Gain (dB)
DJ9BVHBMGF1302CAVITY.2417.4
KD4LTHBMGF1302CAVITY.2919.9
KD4LTHBMGF1302 X2CAVITY.3349
WA4NJPHB2 X MGF1302CAVITY.4545.4
KN4SMTELETEC70ALC.4818.4
W8TNHBMGF1302CAVITY.5221.6
KN4SMSSBLNA435LC.5215.6
N0HJZARD  .6317.4
WQ0PHBMGF1302CAVITY.6717.3
N0HJZARR  .7318.2
WA0BWEARRMGF1302LC.7819.9
K0FQAHB  .817.3
WA0BWESSB  1.218.6
W0PPFHBDXL2502LC1.2516.9
WG6KHAMTRON  2.215.7
WB5LUAHBINA51163 MMICMicrostrip2.2620.3
WB5LUAHBINA30 MMICMicrostrip2.6220.3
N2CEIDEMTransverter .6428.1
 
902 MHzCall DesignDeviceInput NetworkNF (dB)Gain (dB)
KH6CPHBNEC32684LC.3315.5
KH6CPHBATF10135HALF WAVE CAV.418.1
WB5IGFHBATF10135LC.5318.5
W0BJHBATF10135LC.7510.8
K0FQAHBATF12535LC114.6
N0AKCHBMGF1302LC1.4512.5
KF0OAHBMRF966HALF WAVE CAV1.811
W0PHDHBMGA86576LC3.0815.5
N2CEIDEMTransverter .918.1
 
1296 MHzCall DesignDeviceInput NetworkNF (dB)Gain (dB)
AA6WISM0PYPFHXCavity.2539.5
KH6CPHBNEC32684ALC.2818.1
AA6WIWD5AGONE321-1302LC.2935
DJ9BVHBFHX35LC.319
WB5LUAHBATF36077LC.3318
DJ9BVHBFHX35LC.4216.2
WA8WZGCOMM LC.4316.1
WB5LUAHBATF10135LC.5413.7
K5MATHBMGF1412LC.5815.4
WB0TEMHBATF20135LC.6113.8
WB0TEMHBNE32194LC.6617.9
WB0TEMHB LC.714
WA4NJPHBMGF1302LC.7625.3
WA4NJPHB2 X MGF1302LC.7823.4
WA0QIIHBATF-10736LC.8512.5
WQ0PHBATF10135LC.9414.5
K0FQAHBATF-12535LC1.0314.2
N8ZMICOM LC1.7916.3
W0PHDHBMGA86576 MMICLC2.3218.4
WB5LUAHBINA51163 MMICLC2.6423.3
WB5LUAHBINA30 MMICLC3.613.2
 
2304 MHzCall DesignDeviceInput NetworkNF (dB)Gain (dB)
KH6CPHBNEC32684ALC.3815.2
WB5IGFLUAATF35076Wire Inductor.3914.3
WB5LUAHBATF36077Wire Inductor.416.8
DJ9BVHBNE424/86576 .4139.9
DJ9BVHBNE424 .4118.7
DJPBVHBNE424LC.4216.93
WB5LUAHBATF10135Microstrip.5813.6
WA8WZGHBATF10135LC.7813
W0FQAHBVJBLC1.3415.7
W2CRSSSB LC1.4317
WB5LUAHBMGA-87563 MMIC 212.6
W0PHDHB LC2.0420.62
WA5TKUHBMGA86576 MMICLC2.2823.8
WA5VJBHBMGA86563 MMICMICROSTRIP2.4220.6
K0GCJAERTECH  5.4822.5
N2CEIDEMTransverter 1.231.5
WA8WZGSSBTransverter 1.7 
 
3456 MHzCall DesignDeviceInput NetworkNF (dB)Gain (dB)
DJ9BVHBNE424LC.5514.4
KH6CPHBNEC326Wire Loop.5512.8
WB5LUAHBATF36077Wire Loop.5825.6
WA8WZGHB2XATF10135LC1.0225.3
K0FQAHB LC1.1922.7
N2CEIDEMTransverter 1.722.4
WB5LUAHBMGA86563 MMICMICRO STRIP2.115.2
WA5TKUHBMGA86576 MMICWire Loop2.2325
WA5VJBHBMGA86563 MMICMICROSTRIP2.715.8
N2CEIDEM2402PA2 w power amplifier3.0520.8
W0PHDHB LC3.519
 
5760 MHzCall DesignDeviceInput NetworkNF (dB)Gain (dB)
DJ9BVHBNE326MICRO STRIP.613.54
KH6CPHBNEC326MICRO STRIP.723.2
WB5LUAHBATF36077MICROSTRIP.7613.4
WA8WZGHB2XATF10135MICROSTRIP1.0218.3
WD4MUO/0COMMJCA TECH?3.621.1
W0UCHB2XATF10135MICROSTRIP4.2510
 
10368 MHzCall DesignDeviceInput NetworkNF (dB)Gain (dB)
KH6CPHBNEC32684AMicrostrip.5711.58
KH6CPHBNEC32684AMicrostrip #2.611.35
N0UGYDEMNEC32684AKH6CP Microstrip.712.85
DJ9BVHBNEC32684AMicrostrip.8912.08
WA8WZGHBATF13135X2WB5LUA Microstrip1.6818
W0KJYHBATF13135WB5LUA Microstrip2.114.33

Tested by WB5LUA, WA8WZG, and WA7CJO
Data entered by N5QGH, KB8OIU, WB5IGF

HP346A Noise Source, Measurement Accuracy of system according to HP is +/- 0.2 dB!
Per NRAO hot/cold tests, NF at 222, 432, and 432 MHz have been increased 0.05 dB