On Wed, 29 Oct 2003 14:48:37 +0100, Andreas Maurer
wrote:

On Wed, 29 Oct 2003 10:02:06 +0000, Robert Ehrlich
wrote:


Why telephone rather than radio? Radio let everybody know what is
happening, rather than only the two persons at bot end of telephone.
Likely mandatory when there is some other activity in parallel (aero
tow, power flying ...).

Nothing worse than someone else interfering during the critical phase
of a winch launch (initial acceleration).

True enough, and you wouldn't want the continuous stream of "take up
slack....take up slack....all out...all out" occupying a common-use
channel either. We use radio to control launch but its on a dedicated
channel (sorry - I don't know the frequency) that is separate from our
tugging frequency and is one that I've never heard interference on.
One benefit is that as well as the winch, the cable truck, golf
buggy[1] and office are all on the channel so the launch marshal can
talk to anybody he needs to.

[1] an excellent and economical way of moving gliders about.


--
martin@ : Martin Gregorie
gregorie : Harlow, UK
demon :
co : Zappa fan & glider pilot
uk :