Sunday, September 28, 2014

1296Mhz 21 element Tonna

Having given some thought about building an antenna for 23cms I decided to splash out and buy a proper yagi. So I went for the 21 element Tonna and ordered one from Radioworld which came the next day.
Yesterday I set about constructing the kit. In the box is the aluminium booms, mounting bracket, plastic element mounts and bags of colour coded copper elements. The instructions are clear and concise. It was easy to put together, the element mounts just clip onto the boom and the driven element is screwed onto the boom.

The elements themselves are all colour coded so that they are mounted in the correct position. However, you have to push the elements through the holes in the plastic mounts and it is tricky getting the elements central. Would be much better if they were already mounted. It took some time fiddling about trying to centre and line up each element. On 23cms the position of each element is critical.

The driven element has a short length of coax and an 'N' Type plug comes with the kit. Not sure why an 'N'Type Plug, surely it would be better to have an 'N' Type in line socket? In fact I decided to use one that I already had. That makes it much easier to use an 'N' Type plug to connect.

The antenna looks quite nice when it is the acid test...does it work well?
Well, now comes the problem. In North West England we are a long way from any amateur radio beacons. The nearest is GB3CL at Clee Hill in the midlands. I cannot receive it here, so unless there is a station on 23cms I can't really test the antenna until the 23cm Tuesday Activity Contest. The next one is in about 3 weeks time. So I have decided to wait until the next contest to try it out properly.

Stay tuned!

1 comment:

hamradioal said...

Put plenty of grease on the fixings for the bracket (cheap BZP bolts that rust), or replace same with stainless steel ones = grease. I have the same 23Cms aerial here. They are a bit expensive really for what you get.

I'm thinking of trying some DIY yagis for 23Cms.

73 Al.