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International Marconi Day


April 20th 2013


Telford & District Amateur Radio Society



The Main Operations this year will take place using the special special call GB100TMD but G3UKV will be operation from Tywyn on the 472KHz band, using the special call GB8MD on Saturday, during daylight hours. It is hoped to erect a kite supported antenna, with a long wire up to 200 metres long.

If weather conditions are not favourable for the kite, the same wire will be supported on poles at a lesser height. The operating frequency will be around 474 KHz, with about 30 watts RF power. Calls and reports will be most welcome. tel: 07932 927887"



Celebrating the centenary of the old Marconi receiving station site at Tywyn In Mid Wales this special call GB100TMD will only be used for this one day event. Our goal this year is to try and make a 1000 QSO`s in 24 hours and beat lasts years total of :-

2012 QSO's TOTAL = 955

3.5MHz =77

7MHz =681


18MHz =65

21MHz =43


So please call us. Three stations normally run on 80M 40M and one for 20M 15M 10M this year we will try and run a fourth station and hopefully cw as well. Please see the bottom of the page for QSL details.

Pictures below from 2011 event


High Quality High Bandwidth 19min film of 2011 IMD


Low Quality Low Bandwidth 19min film of 2011 IMD





Will operate from a field adjacent to the Marconi Receiving site at Tywyn

Worked All Britain Square SH50.

Grid Square Locator IO72XN.

Welsh County Gwynedd.
National Grid reference SH594002.

UK Postcode LL36 9HN.

For more informational about the Marconi Receiving site visit Click Here




Main antenna systems, attached to five 300ft. lattice masts, aligned for east/west reception. ‘Balancing’ antenna at right angles on 80ft. masts to provide some nulling of the very powerful Waunfawr partner transmitting station to the north.


There was also a ‘reserve’ antenna mounted on 36 wooden masts at 30ft. height.


The main purpose was to receive very long wave spark signals, from about 20 – 70 KHz (15000 to 4300 metres).


Most of the 8 operators were women. Each operator would sit alongside the transmitting operator who had remote control of the Waunfawr transmitter.


It had landline connections to the Central Telegraph Office in Fenchurch Street, London, to and from where most messages originated or were sent.


During WW 1, the Post Office controlled Tywyn station on behalf of the Admiralty.

Tywyn introduced one of the first 24 hour shift systems of operators in the country.

Tywyn’s prime purpose was to receive Trans-Atlantic messages from North America, particularly Glace Bay in Nova Scotia, but it also received messages from all parts of the world.


March 1920, full duplex operation with its partner transmitting station at Waunfawr was introduced. Speeds of 10 letters per second became practical.


Closedown: March 1923. Duties transferred to the more up to date station at Brentwood, Essex.


HISTORY SNIPPETS: Built 1913 as receive partner station for Waunfawr Transmitting Station (callsign MUU) near Caernarfon, about 40 miles north of Tywyn.


It replaced the abandoned Clifden Marconi site on western Galway coast of southern Ireland.

The station was visited by Marconi in person, and he moored his steam engined yacht ‘Elettra’ at Aberdovey harbour, about 3 miles south, in the Dovey estuary, in 1918. Crewe of about 30 !

Marconi’s dates: 25 April 1874 to 20 July 1937.


A special date was 22nd September, 1918 when a message was sent from Waunfawr to New South Wales, Australia. This was the first time a message was received between the UK and Australia.The involvement of Tywyn station in this historic achievement is not entirely clear.

Eight bungalows were built for station operators and technical staff after WW 1. These are all currently occupied, but privately owned.

The main station building has been converted to two semi-detached houses, which are still occupied by private households.


The generator house also still exists alongside the original main station building. It has also been adapted for other purposes.


MARCONI (IMD) AWARD DETAILS: - see also www.gb4imd.org.uk

There are about 50 active official IMD stations active - in Europe, N & S America and Australia.

7 classes of award, but main one contact with at least 15 official IMD stations on any HF band (500 KHz and 1.8 to 30 MHz only). SWL award for reception of at least 15 official IMD stations.

Signed and counter signed extract of log (handwritten or computer printout) required.

Issued by Cornish Amateur Radio Club. Address: IMD Awards Manager, Cornish Amateur RadioClub, PO Box 100, Truro, Cornwall TR11XP, England.

Cost £5 (or 10 euro or 10 US$) – see www.gb4imd.org.uk for full award details.

How To Get a QSL Card

Send yours Via bureau sent on receipt of yours qsll.

Or email details of the qso to buroqsl@pleasemail.me.uk

the details will be checked and if correct one will be sent to you via the buro

Direct QSL is Via M0PNN.

For UK Stations an SAE with Correct Postage Europe and rest of World SAE $2 please no irc.

cards received without postage will be returned via buro.

Paul Bowen
12 Powell Place

Please The Visit Telford & District Amateur Radio Society Website


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