This is something which has fascinated me since moving to Skegness. I have been able to hear vertically polarised signals settling in well on a horizintal antenna. Furthermore, the signals can be as good as they are if the antenna was vertical! The polarisation of the signal must be flipping, perhaps due to the properties within the troposphere.daveB wrote:The latter is an subject that warrants separate investigation - why do vertically polarised signals (apparently) 'suffer' from polarisation changes so much more so than horizontally polarised signals?
Is this something which only happens on the coast and to signals which have travelled across water? I don't hear horizontal signals on a vertical anntenna in this way.
With the FM5 on the roof of the previous QTH, I would only ever hear a boost in vertical signals when conditions were well below average. I assumed this might be because the horizontal signals were greatly reduced in strength and thus were less likely to be strong enough to block out the verticals. Then this ...
Just before moving to the current QTH I experimented with an FM3 and an FM5 only one metre above the garden because the rooftop 9.2 was receiving a lot of noise. I found that the regular vertical signals from Holland and Belgium would suddenly leap up out of the noise and push through MUCH better then they would have done on the vertical 9.2. They were often fully quieting and even gave up the RDS ! I noticed this same thing when we moved to the current QTH when I installed a temporary FM5 on the garden, also one metre above the garden. But get this ... I recently lowered the 9.2 due to high winds and found this too had the effect of boosting the Dutch verticals, but all the time and not just during lesser conditions. I now wonder if there is some interraction between the antenna and the roof or ground. I will lower the antenna further still if we have any winter storms. I am even tempted to try this now as I can't wait to see what effect this has. (Lowering the 9.2 reduces all the ground wave signals, but the skywave signals remain largely unaffected.) I am tempted to put up a temporary FM3 or FM5, again at one metre above the ground. Why wait until winter?A