A 1:1 Choke Balun that features a switch to turn a Doublet or G5RV into a Marconi "T" Antenna. Part of our new "Elite" range, this gives you the opportunity to get the lower bands such as 160m, 80m or 60m from an aerial that may, under normal feeding, be too short to operate effectively.
It functions as a normal Doublet/G5RV Choke until switched inline, which makes the feeder+aerial wires radiate and enables the ground-radials. The unswitched version can be found here.
This box does NOT feature the rear-mounted M5 bolts as it is not designed to be exposed to the elements.
If you are using this box with a Dipole/Doublet that is always used below 10MHz, the 75-mix ferrite is best. If you're converting an "all round HF" Doublet, then select 31-mix.
This box should be connected to a short length of coax to your ATU.
The 3rd image shows a conventional feeding arrangement for a Dipole/Doublet.
The 4th image shows how the switch affects the wiring when "inline".
It should be obvious that, when switched inline, RF is now "in the Shack" so care must be taken to avoid long lengths of radiating feeder!