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Re: Is this group about amateur radio in the UK?

"Walt Davidson" <g3nyy@invalid.invalid> wrote in message
news:22n155taerlgdka15ihurioeun3bkn5h40@4ax.com...
> On Sun, 5 Jul 2009 17:42:09 +0100, "Jeff" <jeff@local.host> wrote:
>
>>However, there is no relationship between NDBs and DME, they can exist
>>entirely separately and are totally different systems. DME is more usually
>>co-located with a VOR beacon.
>
> I know they can exist separately, but it is nonsense to say that there
> is no relationship between NDB and DME.  At many airfields they are
> used together as the basis of a standard instrument procedure for
> approach to the runway.
>
> Definition.  NDB/DME Procedure: An instrument approach procedure for
> use by aircraft landing on runways which do not have an ILS or where
> the ILS is not available. The pilot follows a bearing towards the
> Non-Directional Beacon and is provided with information on the
> distance of the aircraft from the airfield by the Distance Measuring
> Equipment.

You are missing the point Walt, the original contention was that NDBs were
"crude nav aids". In fact they are, just simple CW beacons, with pretty poor
accuracy due to the limitations of the DF receiver in the aircraft. It is
just like a fox hunt on top band with very similar equipment.

Although they may be used in conjunction with DME they are not linked to DME
in any way and were around many years before DME was invented. You could
just as easily associate a railway line with DME, which you follow towards
an airfield looking at the DME to give you range.

73
Jeff

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