Although the Hum level can be very erratic at times there appears to be an underlining pattern in which the level increases during the evening, reaches a maximum around midnight and then decreases rapidly with daybreak. As a child I was an avid listener of Radio Luxemburg which broadcast on 208 metres. During the day the received signal was so weak as to be unusable but with the approach of night the signal gradually increased in strength reaching a maximum around midnight. The dark winter months gave the best reception, summer months gave very weak signals. These well known facts were due to changes in the ionosphere, particularly the F2 layer which would go from a height of 250 km during the day to over 400 km at night.
I am not suggesting that the Hum is caused by radio transmissions only the daily pattern is of interest. My thoughts were turned to this matter by the recent postings of John Beaman on the Hum and Sun Spots for the ionosphere is a product of the Sun and they are intimately connected. -- You received this message because you are subscribed to the Google Groups "Hum Sufferers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/hum-sufferers?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
