Radio Propagation - VHF and higher
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1 Radio Propagation - VHF and higher (Without the Mathematics) Presented by Dr John Worsnop G4BAO RSGB Propagation Studies Committee RadCom GHz bands Columnist With a little help from willis.com/tutorial/propagation.html
2 VHF and above the big myth Foundation Exam Syllabus, 6.a.5, states: Recall that, at VHF/UHF, range decreases as frequency increases, and that in general, VHF/UHF waves have a range not much beyond line of sight So Range on VHF and up is in general line of sight plus a bit eh? Oh Dear!! in general is an understatement..!! That sounds really boring..no DX so why bother?..and why are there over 220 current 50MHz DXCC holders?..and I ve worked 66 DXCCs myself by not being very active?..and I ve worked 20 DXCC entities on 1.3GHz..and 36 on 70MHz? It s frankly misleading and must put people off VHF
3 The environment for VHF propagation Most VHF propagation goes on in the troposphere - with some notable exceptions
4 Terrain map G4BAO -> GM0USI/P The environment for VHF propagation Path profile
5 A bit of physics Radio waves are the same as light waves, they are just lower in frequency. So they are subject to: Refraction Reflection Diffraction Scattering Most VHF propagation is a combination of all of the above. That makes it INTERESTING Even line of sight signals fade due to multipath
6 A bit of physics Refraction Reflection Diffraction Scattering Typically, the refractive index in the troposphere falls slowly with height and the resulting refraction causes the radio horizon to appear to be 1.33 times further away than the geometric horizon.
7 A bit of physics Refraction Reflection Diffraction Scattering Reflections from the Ground The reflection co-efficient for ground reflections depends principally on the dielectric constant e and the conductivity s. It is different for vertical and horizontal polarization.
8 A bit of physics Refraction Reflection Diffraction Scattering The Huygens principle of wavelets can be used to explain this Each point on a wavefront acts as a source of secondary wavelets. The combination of these secondary wavelets produces the new wavefront in the direction of propagation
9 A bit of physics Refraction Tropospheric scatter is the scattering of RF energy from regions of the troposphere with slightly different refractive index Reflection Diffraction Scattering Rayleigh Scattering Rayleigh scattering is normal scattering of radiation by particles whose size is 0.1 or less than that of the radiant wavelength. Scattering increases with the fourth power of the frequency. (Which incidentally is why the sky is blue.) McGraw-Hill Dictionary of Aviation
10 Physics in action Extended Tropospheric - A combination of refraction and diffraction Tropospheric Ducting Ionospheric refraction/reflection
11 Physics in action Extended Tropo Tropospheric Ducting All bands above 50MHz Flat band km depends on equipment & site Always present Caused by normal refraction and diffraction 4/3 earth effect
12 Extended Tropo Tropo Ducting Physics in action Best at 144MHz and above km typical (SP,DL,SM,OZ,EA,HB9) Bitterverlifton Weather-dependent Temperature inversion layers Paths often along the edge of anticyclones (High pressure systems)
13 Extended Tropo Tropo Ducting Physics in action A tropo sea duct off the Spanish coast, August 2013 Best at 144MHz and above km typical (SP,DL,SM,OZ,EA,HB9) Bitterverlifton Weather-dependent Temperature inversion layers Paths often along the edge of anticyclones (High pressure systems) See the trapped pollution layer?
14 Extended Tropospheric Tropo Ducting Physics in action Inversion layers Refractivity profile - flat band
15 Extended Tropospheric Tropo Ducting Physics in action Refractivity profile during ducting The day of the 10GHz UK record 1429km QSO between GM0USI/P and F2CT/P
16 Physics in action Extended Tropospheric Tropospheric Ducting Tropo Scatter 144MHz to 5GHz bands 1000km depending on equipment Usually requires QRO and big antennas Always present Used by professional fixed broadband links
17 Physics in action Extended Tropospheric Tropospheric Ducting Bands above 1296MHz Weather dependent (obviously) km depending on equipment Scattering from rain droplets Depends on drop size and intensity
18 Physics in action Extended Tropospheric Tropospheric Ducting 144MHz to 10GHz Up to 800km depending on equipment Aircraft must be approximately at the mid point of the path
19 Physics in action Extended Tropospheric Tropospheric Ducting 50MHz to 144MHz Up to 2500km depending on equipment Specular reflection from ionised trails of shower and random meteors Path loss proportional to freq 3 JT modes used and timed periods. JT6M and ISCAT-B on 50MHz FSK441 on 70 and 144MHz Minimum Equipment 50W and a dipole for 50MHz 50W and small beam for 70MHz 100W and a 9 element for 144MHz
20 Physics in action Extended Tropospheric Some examples Tropospheric Ducting JT6M FSK441
21 Physics in action Extended Tropospheric Tropospheric Ducting 50MHz to 144MHz bands (432MHz rarely) km+. Single and double hop. Characterised by huge signals and deep fading. Mainly a summer phenomenon (April-Sept)
22 Physics in action Extended Tropospheric Tropospheric Ducting Mainly 50 and 70MHz or 144MHz Usually requires QRO and big antennas D and E layer Forward Scatter km. Optimum time between 10am and 2pm, local time, when the sun is highest and D layer ionization is greatest. Marked daily variation in the intensity of ionoscatter Some days will be completely unusable.
23 Physics in action Extended Tropospheric Tropospheric Ducting 50MHz to 432MHz bands lower bands better Caused by solar flares Energetic particles spiral down the earth s field lines and ionise the polar E layer Backscatter mode everyone beams North(ish)
24 Putting it all together Not just line of sight plus a bit! Lower VHF bands can give good results with Es even with a poor site. 50 watts to a vertical on six and you ll work summer Es DX High pressure systems are generally good for VHF High K and A indices are good for the low VHF bands as they can result in Auroras Monitoring weather maps, the University of Wyoming upper air soundings, and the K index will give you an indication of what bands you should concentrate on. Summer good for rain scatter due to prevalence of thunderstorms Spring/Autumn are good for tropospheric ducting and extended tropo Coastal sites are very good for sea ducting on the GHz bands QTH is not everything, system design is.
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