Home Technical  Activations Gallery About me

I often play QRP on HF. I have a number of transceivers that I regularly use, mainly for CW. These are currently the FT-817, KX1 and K2 each of which has either an internal or external ATU. The antenna I use is usually an Inverted L.

I have one or two 10m fishing poles and use these to support the Inverted L.

I have used this configuration extensively whilst staying in my caravan and on my canal boat. It is easy to erect and has a minimal ‘sky footprint’ and have never had anyone object to my using it.

Above: the ‘Earth Stake’ with ‘choc block’ connection for the ground ‘counterpoise’ and the SO239 socket grounded on one corner to the braid.

Detail of the ‘Earth Stake’ and its connection to the SO239 connector. The ‘Ty-wrap’ is for strain relief of the antenna wire.

The complete kit: 20m of 7*0.1 wound onto a cable tidy, plastic ‘drawing-pins’ to hold the ‘earth counterpoise’ down into the damp grass, screwdriver to fix the ‘choc-block’ to the end of the antenna wire and then to the back of the SO239 centre-pin. Once the antenna wire is unravelled and connected to the SO239 centre-pin, strain relieved to the ‘ty-wrap’ the loose end is passed through the first dog-bone and tied to the second. The first dog-bone is attached to the top of the first 10m pole and the second dog-bone is attached to the second pole. As the poles are raised the antenna wire adjusts itself to lie in and Inverted L shape. The earth stake is pressed into the ground and the counterpoise laid out roughly in the same direction as the aerial itself.

Detail showing the strain-relief swivel which connects to the ‘ty-wrap’ and the end of the antenna wire to the ‘choc-block’. I hope the diagram below helps to make sense of the whole of the aerial system.

To the left: Showing in a little more detail, the connections to the ATU via RG-58, the SO-239 to the earthing connections (earth stake and counterpoise wires), the ‘Ty-wrap’ ‘insulator’, the snap-swivel and the aerial wire.