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Diversity Antenna

 
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ysurya
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Joined: May 23, 2006
Posts: 28
Location: Southampton

PostPosted: Wed Mar 07, 2007 12:47 am    Post subject: Diversity Antenna Reply with quote

Has anybody tried this antenna for TMC?

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ih=001&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=110098500863&rd=1&rd=1
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philpugh
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Joined: Dec 28, 2005
Posts: 2003
Location: Antrobus, Cheshire

PostPosted: Wed Mar 07, 2007 11:43 am    Post subject: Re: Diversity Antenna Reply with quote

ysurya wrote:
Has anybody tried this antenna for TMC?

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ih=001&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=110098500863&rd=1&rd=1


No - but it looks like a "standard" wideband aerial with pre-amp. A true diversity aerial would have two (or more) widely separated antenae each with their own amplifier and the aerial recieving the strongest signal at any time is fed to the output. Remember UK police cars a number of years ago? They usually had a couple of aerials on the roof for this purpose.

Anyway the problem with internal aerials is that they still get affected by the metal and internal electronic noise (from car radios, mobile phones, GPS systems...) and amplifying them doesn't generally improve anything all that much. It would be much better to use the current external car aerial, put a pre-amp on this and use a splitter to derive two signals - one for car and one for TMC unit.
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