Re: A simple question for James Cridland and anyone else...

In article <4c3dce16$0$22945$e4fe514c@xxxxxxxxxxxxxx>, hwh
<iimeeltje@xxxxxxxxxxxxxxxxxx> scribeth thus
On 7/14/10 1:12 PM, Mark Carver wrote:
On 14/07/2010 11:58, Alan White wrote:
On Wed, 14 Jul 2010 10:34:04 +0000 (UTC), boltar2003@xxxxxxxxxxxx wrote:

Why would you ever want to use horizontal polarisation with FM radio?
Most
car radio and portable set antennas will be in the vertical position so
whats the point?

When FM broadcasts where started in the UK (1958?) it was a 'hi-fi'
medium and was only intended to be receivable in the home on static
equipment.

At that time it was considered that, on suitable equipment, the most
faithful reproduction available to the home listener was a live FM
broadcast.

Indeed. FM transmissions started in the UK in May 1955, and reception
was designed with roof top yagis in mind (just like TV). Horz P was
selected as it gave the best immunity to multipath.

Interestingly, one of the very few mixed-pol stations in the Netherlands
changed from mixed (100+100 kW) to vertical-only (at 200 kW) to avoid
teething multiplath problems.

Can you explain that further, "teething multipath problems"?..

Of course these days most receivers use V-pol aerials.

In Germany almost every station still uses H-pol, even if they were
installed recently.


How odd?...

gr, hwh


--
Tony Sayer


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