Latest 432MHz DX spots

 

VHF/UHF QSOs real time maps (click below)

432MHz can be a very frustrating band. Long distance radio communications are possible via Tropo Ducting. This mode of propagation requires specific weather patterns to create the conditions (temperature inversion) needed for the duct to be created; basically a steady high pressure system is required 1025mB plus and light or no winds. The duct that is formed is a warm air layer sandwiched between colder air layers and can be likened to a pipe inside which signals are trapped, but if there are mountains in the way they will block this. Fog can be an indicator to such conditions.

Tropo ducting occurs when there is a temperature inversion. This often occurs when there is fog and steady high pressure over a number of days. The greater the size of the inversion duct or 'pipe' the lower the frequency that will be trapped within. This means in practice that as the inversion gets larger microwave frequencies 1296MHz will be supported first, then UHF 432MHz, then lastly VHF 144MHz. An inversion of around 300feet (91m) depth is required to support 432MHz signals.

Inversion duct thickness required
Feet
Metres
Band
MHz
300
91
UHF
432 MHz
600
183
VHF
144 MHz

A valuable source for vertical profiles of dew point, air temperature, wind speed, wind direction and many more parameters is also provided by the University of Wyoming, Department of Atmospheric Science.

Having selected the continent of interest, you may choose various types of plots. I suggest you use the "GIF: to 700 mb" (see the blue highlighted area above), which will generate a picture displaying the vertical profile of dew point and air temperature - a perfect tool to identify Tropospheric ducting. Before you can retrieve the data, select a site (airport) to request a sounding at that location.

Click the map image above to access the upper air sounding data. The two examples below show first normal conditions and secondly Tropo ducting.

Normal conditions

Tropo ducting

When I lived in London, which is fairly flat and has a good view to the horizon, I could work Switzerland with 10watts and an ex-military flat phased array of 16 dipoles and a reflector panel. Since moving to the Lake District in 1990 the furthest distance that I have achieved has only been around 200km via Tropo scatter. The mountains simply block all Tropo Ducting for me as I live in the valley floor. In 2006 there was a fantastic Tropo Ducting opening to Scandinavia which we could hear from the top of the Pennines 20km to the East of my QTH, but as soon as you drove slightly down the hill towards my home they all disappeared.

 

There are other methods of achieving long distance communications on this band such as Amateur Satellites or Moon bounce (EME), but this can get very complicated and often may require an elevation rotator and extensive antennas. Signals on 432MHz are much weaker than on 144MHz. It is however a good band for mobile repeaters using FM and the UK has an extensive network in most areas.

432 MHz Links

Latest UK Band Plans

G1MFG ATV

 Region 1 432MHz Beacons for your location

70cm Live interactive map

432MHz Cluster

RSGB VHF Contests

 432 MHz latest DX map

QRP 432 MHz EME logger

Tropo

ON4KST 432 MHz Chat

European VHF/UHF contest calendar

VHF/UHF QSOs real time maps

FREQUENCY

MODE

REMARKS

432.085 MHz USB (PSK31)    PSK Centre of activity
432.200 MHz USB   

SSB speech Calling frequency

432.370 MHz USB (FSK441)  

FSK MS Calling frequency

433.500 MHz FM  FM speech calling frequency

 

432 MHz Beacon list    for G0ISW in IO84OQ
   European beacons, last updated 23.04.2006     You may change callsign and locator!
                 
Frequency Callsign Locator QTF QRB ERP (W) Antenna QTF Remarks / hrd
                 
432.368 UT5G KN66LS 95 2632 5 dipole 0/180  
432.400 OE3XMB JN77TX 113 1475 2      
432.401 SK2UHF JP94WG 41 1650 300 2 x 20 el. coll. 0/225 only S beam operational
432.402 OY6BEC IP62OA 346 848 50 7 dBD 135 QRT?
432.404 F1ZNI JN23MM 152 1364 10 Big Wheel omni  
432.405 SK1UHF JO97CJ 68 1333 50 Alford slot omni  
432.405 HG8BUA KN06PW 107 1886 30 5 el. Y 260 03/2004 HA8MV
432.407 PI7YSS JO32CD 112 659 4 Big Wheel omni  
432.408 F5ZPH IN87KW 182 751 20 4 el. Y 135  
432.410 DB0ZW JN69EQ 112 1171 1 Slot omni  
432.412 DB0JG JO31GT 113 698 1 Colverleaf omni  
432.412 SK6UHF JO67EH 67 985 10 Cloverleaf omni  
432.413 F5XAG IN93WC 170 1302 40 2 x 10 el.Y 22  
432.416 PI7CIS JO22DC 119 550 75 Dipole 90/270  
432.417 OH9UHF KP36OI 39 2058 70 9 dBD 200  
432.418 F1ZQT IN95OX 171 979 1 Big Wheel omni  
432.420 F5XAS JN12BL 163 1404 15 Big Wheel omni  
432.420 DB0VC JO54IF 88 873 10 4 x DQ omni hrd 10.08.2004
432.423 PI7HVN JO22WW 105 601 0,5   omni  
432.425 LY2WN KO25GC 77 1737 10   omni  
432.425 DB0MMO JN49RV 118 987       DH4FAJ 22.04.2006
432.429 HB9OK JN45MW 134 1282 3,5   omni temp. QRT
432.430 DB0MFI JN58KR 120 1148 10   omni  
432.430 HG7BUA JN97KR 108 1687 3 Slot omni  
432.432 OH6UHF KP13GM 45 1730 7 3 x Big Wheel omni  
432.432 HB9F JN36XN 136 1177 15 corner 0  
432.434 DB0LBV JO61EH 104 1079 0,4 Slot omni  
432.435 OH5SHF KP30HV 56 1856 25 4 x dipole 220  
432.436 F5XAZ JN06KN 163 939 50 Big Wheel omni  
432.439 DB0AS JN67CR 120 1296        
432.440 DB0RG JO41RD 111 909 1 V-Dipole omni reported 29.06.2004
432.440 SK7MHH JO86GP 72 1228 100 Alford slot omni  
432.441 LA5UHF JO28UO 47 677 300 6 el.Y 220  
432.442 I8EMG JM89BJ 133 2209       reported 08.08.2004
432.443 OH2UHF KP20BB 59 1706 60 2 x 10 dBD 30/235  
432.444 DB0KI JO50WC 111 1115 2,5 dipole omni  
432.445 DB0OS JO40CW 115 847 0,3 Slot 270 reported 03.08.2004
432.447 DB0IH JN39ML 127 886 1 Big Wheel omni  
432.449 OZ1UHF JO57FJ 64 875 10 Big Wheel omni  
432.450 DL0UB JO62KK 97 1062 10 Crossdipole omni  
432.450 HG3BUA JN96CC 114 1758 2 Slot omni  
432.450 I5WBE JN53LK 136 1597       reported 08.08.2004
432.455 SK3UHF JP92FW 44 1517 50 2 x dipole omni info SM6CEN
432.460 DB0LB JN48NV 123 1040 0,2 Corner dipole 10-180  
432.460 SK4BX/B JO79LH 57 1187 50   omni formerly SK4UHF
432.463 LA2UHF JP53EG 33 1212 300 10 el. Y 15 temp. QRT
432.465 DF0ANN JN59PL 115 1120 1 Big Wheel omni  
432.468 LA6UHF KP59AL 32 2319 40 15 El. Y 210 temp. QRT
432.471 OZ7IGY JO55WM 78 936 200/20 6 el.Y / Big Wheel 30/omni OZ7IS 16.07.2005
432.475 DB0SGA JN69KA 114 1243 5 4 x 11 el. Y omni  
432.475 ES0UHF KO18DN 64 1583 40 Alford slot omni  
432.475 HG5BUA JN97KR 108 1687 1 Big Wheel omni  
432.476 HG1BUA JN87FI 113 1566 3 Big Wheel omni  
432.477 DB0ABG JN59WI 115 1162 1   omni  
432.478 LA3UHF JO38RA 55 731 50 13 el. Y 180  
432.480 LA8UHF JO59FB 53 938 50 8 el.Y 180  
432.485 LA4UHF JO29PJ 40 715 15 3 el.Y 160 temp. QRT
432.488 DB0AD JO40AQ 117 854 1      
432.489 SK7MHL JO65OR 77 1019 40 Alford slot omni  
432.830 F5XBA JN18KF 149 818 10 4 x HB9CV omni  
432.888 GB3BSR IO81 ##### #####       reported 05.09.2004
432.847 9A0BUH JN85JO 118 1713 1 V dipole omni  
432.870 OK0EZ JN79VV 105 1366 0,5 Crossdipole omni new QRG .470
432.403 EI2WRB IO62IJ 231 391 250 5 el.Y 95 QRV?
432.875 OH7UHF KP32TW 50 1951 15 6 dBD 225 new QRG .490
432.886 OK0EP JO80OC 102 1443 3 2 x 4 el.Y 150/270 new QRG .436
432.490 GB3SUT IO92CO 164 241 10 2*8 El. Yagi 0/135 QRV?
432.888 OM0MUA JN88NE 110 1551 1 dipole omni new QRG .478
432.895 OZ4UHF JO75KC 80 1128 30 Clover omni QRT
432.900 DB0YI JO42XC 104 891 3 Big Wheel omni  
432.908 EA8UHF IL28GC 204 3128 10   omni  
432.430 GB3MLY IO93EQ 145 135 40 6 el.Y 150 QRV?
432.918 EA6UHF JM08PV 168 1782 10   omni  
432.934 OK0EA JO70UP 102 1321 3 2 x 15 el.Y 180/270  
432.400 GB3BSL IO81QJ 178 366 250 4 x 3 el.Y 90  
432.950 S55ZRS JN76MC 120 1576 1 Slot omni  
432.445 GB3LER IP90JD 8 614 675 12 el.Y 165 QRV?
432.470 GB3MCB IO70OJ 197 496 12 4 el.Y 45 QRV?
432.970 OK0EB JN78DU 112 1338 0,2 Mini Wheel omni new QRG .446
432.975 DB0JW JO30DU 121 744 50 2 x 11 el. Yagi 45  
432.453 GB3ANG IO86MN 357 209 100 9 El. Yagi 170 QRV?
432.980 OK0EC JO60CF 110 1128 1 10 El. Y 90 new QRG .452
432.982 OZ2ALS JO45UB 82 800 40 4 x dipole omni QRT
432.982 SR5UHF KO02OF 90 1604 0,3 turnstile omni  
432.990 ON4UHF JO20ET 129 646 0,5 Cloverleaf omni  
                 
  Beacon call in red: no spots in 2005        

 

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432 MHz (70 Centimetres)

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