Just Sharing This DVB-T & sunspots

[malti]

I live in Malta, a frindge area for Italian (Sicilian repeaters etc ) DVB-T stations.

It is worth nothing, that contrary to general belive, UHF and SHF wireless transmissions are also affected by the sun's solar flares activity, same way as HF shortwaves are.

I have noticed that tv stations grouped on a particular frequency say 700Mhz, are down, whilst others, on, say 800Mhz, are up and alive ! Same for other frequencies in the DVB-T range. This is all due to the current propogation conditions, which they say will last till 2020 !

In good conditions, I can see over 150 DVB-T Italian stations. Malta is just 60 miles off Scicily, but some 120 miles off the Italian repeater and DVB-T transmitters at Monte Lauro.

 

[Mickha]

You have posted in a satellite fringe reception section, so I've moved your thread to a terrestrial section.

 

[aceb]

Please show your supporting evidence for this theory. You seem to be confusing ionospheric and tropospheric propagation modes and the effects you describe are more likely caused by temperature inversion and the refractive index rather than solar wind.

Long sea paths can produce very intense tropospheric ducting and the Med with warm sea temps and hot land temps is no exception, 120 miles is achievable under flat conditions, 1000KM over water is common. This link is a tropo forecast map Tropospheric Ducting Forecast for VHF & UHF Radio & TV and shows where the extended paths should exist across the Med. I know someone in Pirgos, Greece who has daily reception of Libyan FM broadcast stations during the summer months, that's about 900KM.

 

[malti]

Please show your supporting evidence for this theory. You seem to be confusing ionospheric and tropospheric propagation modes and the effects you describe are more likely caused by temperature inversion and the refractive index rather than solar wind.

Long sea paths can produce very intense tropospheric ducting and the Med with warm sea temps and hot land temps is no exception, 120 miles is achievable under flat conditions, 1000KM over water is common. This link is a tropo forecast map Tropospheric Ducting Forecast for VHF & UHF Radio & TV and shows where the extended paths should exist across the Med. I know someone in Pirgos, Greece who has daily reception of Libyan FM broadcast stations during the summer months, that's about 900KM.

You are right. The average summer temperature here in Malta is in the 90's and the phenomina happens in summer.
I have a flat near the sea, at the north of the island and the antenna is 5 stories high, and still expierence this effect. It will be interesting to see what will happen, when I intend to raise up my antenna to two stories at my winter house, which is in the centre of the island, furthest away from the sea!