Re: 52 dB any good?

In article <J4ydnfd_luefLc3ZRVnyuw@xxxxxxxxx>, Keith G <keith_g@xxxxxxxxxxxxx>
writes

My new/old Technics tuner advises me my FM signal strength is 52 dB - is
that good, bad or just plain ugly, given the palaver with the aerial
installation a while back?


That type of signal meter is "intended" only for a relative use not absolute
as such. Course it could be calibrated against a "known" but they very rarely
are accurate.

That said assuming that the BBC have use an ommni pattern at Peterbourgh and
that pattern isn't quite ommni as they will be using either dipole arrays on
each side of the mast face, or as the following example shows Spearheads on a
triangular mast!.


http://tx.mb21.co.uk/gallery/wrotham/mixedpol.asp

But lets assume that they are still using the same output power 20 kW per
service so at Keithy towers thats predicted to be a level of 68.7 dB/uV per
metre or -45.7 dBm which would be more than adequate for stereo reception
assuming that the mean aerial TX aerial height is 145 MAGL and that Keith's RX
aerial is say 8 MAGL which is a "line of sight" path!, and assuming that he's
finally got a four element and assuming that is on the correct bearing and
that the downlead is of CT 100 or similar then yep, thats fine.

So no problemo. Just enjoy the musicke:))

--
Tony Sayer

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