MM0HAI Operation

Modes of Operation

I don't operate from the base station much. This is partly because it's not a very good site: there is severe QRM and poor VHF coverage. I also find it rather boring to hear someone say 5 and 9, which is almost all they do on HF.

Instead, I like to combine radio with other activities: I do it in interesting places and modes of transport.

As for places, this usually means up hills and doing SOTA activations.

Transport includes bicycle, unicycle, kayak, train, and a long time ago, bus. I have also operated maritime mobile from yachts but have yet to operating on the London Underground[1] or a motorbike. There are more ways to be mobile than by using a car.

I also operate pedestrian[2] mobile, usually in the hills but occasionally in town.

The Station

The station currently consists of an Icom T8E, a Yaesu FT-817 and an Icom 725.

The T8E produces 2W of FM from internal battery and is used for SOTA activations with a telescopic whip. It is also used pedestrian, bicycle and unicycle mobile, usually in a rucksac side pocket with rubber duck and speaker mic.

The FT-817 is used at home for 6m ssb and VHF / UHF fm. It goes up hills for SOTA. I've done some experiments with it on my bike for HF. I used a short vertical antenna with loading coil fixed to the carrier. The frame was connected through a variable capacitor to form a ground. I only tried this briefly and made no contacts but intend to develop a better system.

The IC-725 is used only at home for HF amateur radio and for listening to the shipping forecast on long wave. It just seems wrong to listen to it on FM or iPlayer.


  1. Some people have tried underground railway operation. See here and here
  2. I dislike the term pedestrian in this case because of its modern connotations and limitation to built up areas. However, it seems that it had a different meaning in the past.
© 2011