Saturday, February 25, 2017

Simple antenna switch - DIY

Necessity is the mother of invention, so today's post showing how to do some recycling and change junk stuff into quite usable thing. 
Working on HF with more than one antenna, or better to say, using radio with single antenna connector is always complicated. Things get worse when You need to switch to some other antenna HERE and NOW, and of course there's always lack of any switch. Recent dx-peditions VP6EU or TX5T are the examples :-) 

We will use ferrite circulator salvaged from Telecom equipment. This will give us perfect enclosure, 3-4 SO-239 sockets, piece of silvered wire and old ceramic junk switch. 
Overall costs - not more than 15-20 Euro, few hours time, including painting. 

This is our base - soon it will switch 2 antennas with more than 500W RF power.

After removing unusable parts, 3 holes were drilled to fit SO-239 sockets

Some painting to get neat look, and sockets installed :

Time for switching part

To ensure that 500W will not harm the switch we need to cross both connector sides with silvered 1,5mm diameter wire :
 No worries about the lenght of connections, it's not microwave device ;-) 

Just add a knob and suitable labels on top and the switch is ready for use :

Tested at solid 500W while hunting for TX5T, measurements done with two 50Ohm terminator shows SWR 1:1,05 on HF bands up to 50MHz. 

Have fun with your own DIY switch ! 


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