Category Archives: End fed half wave

20m End fed half wave

I used a 20M EFHW and few years back with varying degrees of success. It was about the time when ‘squid poles’ became a popular antenna supports. The single core wire element was wrapped round the pole but the problem was that most poles then were made of a carbon fibre material which made them conductive. The antenna did not work so well.

This week I tried out a new, 10M fibreglass pole and, like before, wrapped the wire round to the pole. First indications are good with low SWR using a commercial 49:1 balun. This was much better than using the small EFHW tuner I made some years back.

Another idea is to use an off centre loading coil to make it a multiband antenna. More to come, watch this space.

 

IC-705 and a new portable antenna

Although I still make stuff it is getting harder especially with small components. Last year I was told that I have rare form of cataracts. That makes working on circuits boards difficult. When the current pandemic is over maybe they will be able to replace to duff components and restore the circuit to its original condition.

This is all leading up the to be the excuse for buying an IC-705! It’s an exceptional radio with amazing performance which is hard to believe for an old timer brought up on HF receivers that occupied a full 19 inch rack.

 

Above left – Marconi HR11 telegraphy receivers with the boss pretending to tune one and above right, Plessey PVR800s telephony receivers. The first transistorised professional RX for the HF point-to-point service. Pics from around 1968 at PO radio station Bearley.

The IC-705 which I can hold in one hand!

So now the work is on perfecting the HF /P antenna. I have gone back to an end fed half wave made from a homebrew system that breaks down into 1m long sections. The aim is to cover 40m-10m with different lengths of wire wound on a reel, after removing the washing line. See Steve Nichols, G0KYA,  post on his blog here.

I also have a couple of light weight fibreglass poles and a drive over support just to make everything more flexible. That will allow me to operate from the car/micro camper.