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From: Martin Brown <'''newspam'''@nonad.co.uk>
Newsgroups: sci.electronics.design
Subject: Re: Who remembers how bad analogue television was?
Date: Fri, 28 Feb 2025 12:08:59 +0000
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On 28/02/2025 01:29, Don Y wrote:
> On 2/27/2025 5:46 PM, Chris Jones wrote:
>> If reception conditions were poor, yes the picture could degrade a 
>> bit, but that is far preferable to the behaviour of digital systems 
>> that completely drop out halfway through the movie if the rain gets 
>> too heavy.
> 
> Is it the presence of the water in the air that is the problem?
> I've noted the correlation but assumed it was because of the
> effects of wind and rain on the *tree* that is in my line-of-sight
> to the broadcast towers.

Quite likely to be a factor. Wet tree leaves can be pretty destructive 
to signals to hence our local microwave internet requires clear line of 
sight or the microwave link is unreliable.

Some VHF/UHF bands are less susceptible to water in their path.

> I.e., if the transmitter had a COMPLETELY unobstructed path to my
> antenna, would rain *still* be a problem?

Obviously it depends a lot on the frequency, but my satellite feed drops 
out when there are tall cumulonimbus thunderclouds overhead irrespective 
of whether it is actually raining. TDTV holds good under most conditions 
expect when the local mast burned down spectacularly in a freak accident.

-- 
Martin Brown