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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

1998 Noise Figure Results

1998 Noise Figure (NF) Results

Tested in Kansas City, MO - 24 July 1998

 

50 MHzCallDesignDeviceNF (dB)Gain (dB)
W4KXYDEMI-CONVERTER 0.9622
KW0TDEMIATF-101361.2321.53
WA5VJBCAVITY 1.322.5
W9JNTE SYSTEMS 1.517.7
KB0PEDEMIATF-101361.523
 
144 MHzCallDesignDeviceNF (dB)Gain (dB)
KA0RYTHBFSC11LG0.1825.5
WA8WZGMCMMGF 14020.2624.3
WA5VJBCAVITYMGA21160.2916.92
WA1MKESSB 0.3124.5
WA5VJB MGF-18010.3622.6
WD5AGO  0.3720.5
WQ0PWD5AGO CAVITYMGF13020.4322
WQ0PLCMGF 13020.4519.3
K5LLLLANDWEHR 0.5218.42
KD4NOQARR 0.6125.5
W0PTARR SP144VDG 0.6223.5
WA9KRTK9CAMGF 13020.819.33
WA9KRTVE7BQHMGF 13020.9920
N0UKDEMATF-101361.220.2
W0PTW9QXP 3.80.4
KB0PEJANEL LABS 713.6
KB0PEHBMRF 9019.38.5
KB0PE"HB,"RCA 406431310
W4KXYDEMTransverter1.0216.4
 
222 MHzCallDesignDeviceNF (dB)Gain (dB)
WA5VJB MGF18010.5721.5
K4YADEMI-CK 0.7616.58
KA9VAWDEMI-CK 117.96
K5LLLARR-VDG 1.2519.7
K5MATADV RECEIVER RES 2.2518.5
KB0PEHANS PETERS 4.928.4
 
432 MHzCallDesignDeviceNF (dB)Gain (dB)
KA0RYT-FTAPPED HB CAVITYFHX05LG0.2222.47
K5JLHBMGF-13020.2222.9
KA0RYT-AHB CAVITYFHX35LG0.2621.5
KA0RYT-CHB CAVITYATF-101350.2718.4
JH0WJF-1FHX35LG 0.2723.28
KA0RYT-HHB CAVITYFHX35LG0.2920.08
KA0RYT-BHB CAVITYFHX35LG0.2923.8
KA0RYT-EHB CAVITY 0.325.9
JH0WJF - 3 MGF43180.3125.2
W7CNKW7CNKATF-36077 L/C0.3220.8
KA0RYT-GHB CAVITY 0.3222.1
JA9BOHFHX35LG 0.3223.73
JA2TYFHX05LG 0.3421.49
JH0WJF-2 MGF-43180.3421.9
KB0MNKRYT CAVITYFHX350.3520.33
WA5VJBVJBATF-132840.3618.4
WD5AGOSTRIPLINE-HBLP7512-AT320330.3838
W1MKESSB 0.424.2
WD5AGOCAVITY HBFHX35LG-MAR110.4128.8
JR9NWCFHX05LG 0.4220.15
W7CNKW7CNKATF-101350.4223.39
KB3PDW6POATF-101350.4816.4
JS3SHPHB CAVITYFHX05LG0.4926.5
KA0RYT-KWD5AGOMGF-13020.515.4
WQ0PLCMGF13020.6217.1
KB0PEARR-SP432VDG 0.7320.2
JA9BOHW1JR 1.118
AA0ENDEMIATF-101361.522.6
K5LLLLANDWEHR 1.714.7
K0RDF  1.89.5
KB0PEICOM / MAST MNTMRF9023.611.7
W0ZQCOMM 3.8912.9
WA5VJB/AB5LCentimeg Converter2X 6AM4 Tubes!9.9721.34
 
902 MHzCallDesignDeviceNF (dB)Gain (dB)
WD5AGOSERIES-L2XATF-360770.4532.3
W4KXYDEMI/ TRANSVERTERN/A0.8228.09
WA5VJB  2.2511.1
WA5VJBCELWAVE 2.7312.8
WA5VJBCELWAVE-G 3.7816.1
 
1296 MHzCallDesignDeviceNF (dB)Gain (dB)
WD5AGOAG0-2-23-HBNE325-ATF101350.333.8
WD5AGOAGO-2-23NE324-ATF101350.3130.9
WA1MKESSB-DX1296 0.3826.9
JA0BZCHOMEBREWFHX35LG0.4617.7
KA0RYTKB2AHFHX35LG Cavity0.7728.6
KB3PDW6POATF-101350.87.48
WQ0PWB5LUAATF-101350.8413.8
JA0BZCHOMEBREWMGF-13020.9121.8
W4RDI  1.45
WF9XCOMM-SSB 1.4219.11
WA5VJBW-J-LOW NOISE TWT 5.4331
N0UKSOTA XVTR 6.868.6
KA1VAWWB6IGP 1812
 
2304 MHzCallDesignDeviceNF (dB)Gain (dB)
WA1MKESSBSLNNA0.3530.6
N0TOUDEMIATF-306770.3818.1
2400N0TOUDEMI / HBATF-360770.3818.1
WA8WZGLUACOM / W5ZNATF-306770.4817.86
W5LUAATF-10136ATF-101360.5213.9
2401N0TOUDRAKE WITH PRE-AMP/HBN/A0.5737.51
2304N2CEIDEMI 2304-144 TransverterMGA-865761.7518.54
2400KA9VAWMODE S CONVERTER 2.4340.8
2304VJBW/J TWTTWT5.7526.7
 
3456 MHzCallDesignDeviceNF (dB)Gain (dB)
W9FZWB5LUA2XATF-101360.9525.2
 
5760 MHzCallDesignDeviceNF (dB)Gain (dB)
W7CNKW7CNKATF-360770.6113.8
W7CNKW7CNKATF-101350.8410
W5LUAWB5LUA2XATF-101350.9818.1
N0DAGHBNE3341.0514.78
 
10368 MHzCallDesignDeviceNF (dB)Gain (dB)
N2CEIWB5LUA2XATF-360771.216.8
W7CNKW7CNKATF-101351.349.87
N4MWWB5LUA2XATF-131361.4819.6
W7CNKW7CNK2XATF-101351.7119.15
 
24192 MHzCallDesignDeviceNF (dB)Gain (dB)
K9PWSSB/ DB6NTNE325842.0430.72
WA8WZGSSB/DB6NTNE325842.1526.05
W5LUAHP MMICHMMC-50232.9520.65
W5LUALUA PROTOTYPEATF-360775.7812.01
WA8WZGDMCN/A6.213
W5LUAAVANTEK SMW87-1188SER#169.169.6
W5LUAHB/ ConverterATF-35076 + mixer10 
W5LUAAVANTEK SMW87-1188SER# 4811.47.6

Tested by W5LUA, N5QGH, WA8WZG, WD5AGO, W5ZN,KA0RYT, N0DAG, K0RDF and Sandra Estevez of Down East Microwave

HP346A Noise Source, Measurement Accuracy of system according to HP is +/- 0.2 dB!

Note - HP346C Noise Source used on 24 GHz