Chelmsford Amateur Radio
Society
Science & Discovery Day 2005, Sandford Mill.
For an On-Line Map to the Science and Industry
Museum, Sandford Mill
Chelmsford Science & Industry Museum has a Science & Discovery Day each
year to encourage involvement with everyday science.
10 am was the early opening time and the local Camera Club took
advantage of good lighting and plenty of equipment & items to capture
on film (or digital).
CARS was invited to provide an Amateur Radio Station in the Marconi Hut.
The usual 80 Metre Doublet Aerial over the water course which
surrounds the contributed to G0MWT putting a strong signal into the
Americas where the Amateurs were just waking up.
Looking around the room a couple of new exhibits were spotted including
one made by Geoff, G7KLV. It was of a demonstration of the rectifier effect
produced by a Diode - the unusual point being that Geoff has used a
large "Bright Emmitter" diode (see right below) of a pattern produced
before 1920!
The public are invited to press a knob to see the AC full wave voltage
from the
mains and the rectified waveform with the old valve and compare it
with the waveform using a Silicon
Diode. The old valve has a 5 volt filament and is really
bright - something few people would ever see.
Teas were provided by Friends of the Museum in the old Battery Room.
The afternoon was busy with over 550 persons in total passing through
the gates by the time they closed at 5pm.
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©Copyright CARS 2005
10th December 2005
Changed Return Coding.
Added to the write-up of the report. Amended Jeremy's Call-sign (M0DUT).
Click here.
Introduction
Denis M0FHA (logging) and Malcolm G4KGL relaxing between QSOs.
Photograph by John, G8DET
Logging has now passed to Jeremy, M0DUT but Malcolm is still on the
microphone, many station calling in as they know Chelmsford or in a few
cases as they are also in Chelmsford (Massachusetts, USA).
Another view of Jeremy & Malcolm working the Club FT748 with
members of the public listening to the QSOs. At the end of the day
over 60 QSOs were made. These were long QSOs, not the "5 by 9 QSL?"
Diode demostration made by Geoff G7KLV