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I have been active on 136kHz both from home and,occasionally, from West Wales. I was part of the first ever QSO on 73kHz, and held the distance record for a two-way contact on that band for 13 months. The first G to work ON on 136kHz. Currently use 136kHz most days on CW and QRSS (extremely slow CW). |
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Location: |
Welwyn Garden City, Hertfordshire. Postcode AL. Loc IO91VT. 30km north of London. |
| VFO and Transmitters: |
Synthesizer designed by G0MRF and SM6LKM, and built by G0MRF.. Ex-Decca navigation station 1kW transmitter running about 600W on 136kHz from 54V PSU. 'The First', a commercially manufactured 12V 136kHz Tx capable of 100W. [Available from Nevada Communications in the UK] |
| Transmit antenna: |
Marconi, inverted-L 14m high with three top wires 16m long. Top and bottom inductive loading, tuned against earth stakes. Drawing of the antenna system used from September 99. I have most of the inductive loading at the top of the mast - about 7mH - with just a 0.5mH variometer at the bottom for tuning. This has been found to increase the efficiency. |
| Receiver: |
G3YXM pre-amp into IC-706 Mk 1. The pre-amp is described on G3YXM's site and is available ready-built from G0MRF (see links page). |
| Receive antenna: | The Marconi works fine for most purposes. A 0.8m square loop is used for portable work and when I need to null out local noise. This is made from 40-wire ribbon cable, and the wooden spreaders are foldable to get the antenna easily into a car. |
| Modes | Conventional CW and extremely slow CW (usually 4 second dot period). During 2001 I experimented with receiving the BPSK mode specifically designed for LF, WOLF. |
| Best DX on 73kHz |
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| Best DX on 136kHz |
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| Operating periods: | Usually active 0830 - 1200UTC Saturday and Sunday mornings. Can transmit any day and time on request. |
| Skeds and reports: |
E-mail me (see below) |
| Operation from Wales: | Follow this link. |
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Last updated: 3 December 2004 |
| Living with Epilepsy |