Schematic drawn by KY6R using Circuit Lab – an excellent web browser based tool.
I use the same relays as Array Solutions does in their gear:
Deltrol 20852-81 12v 35a DPDT – $13 at Galco
I went over the Rig Experts AA-30 SWR plot and found that on every band from 160-10M, one of three UNUN’s or 1:1 Curent Choke will keep the SPE Expert 1.3K amplifier happy. This means I wouldn’t need the Palstar AT2K – at least this works on paper. I just happen to have this control box in my junk box – where the RCS-4V remote switch burned up, but the Control Box can be re-purposed for this project:
Because it injected AC to control the remote switch – using the coax as the control line – I have to rework it a bit and probably remove a few parts or even cut some pads on the PC Board:
The rework . . . and here’s what the new (and simpler) circuit looks like:
Position 4 isn’t used – but could be used for another UNUN or Balun, maybe for a ladder line fed doublet that I might throw up in the trees – like maybe a 17M extended double zepp – pointed at 3Y0Z.
Array Solutions rates these relays at 5 KW- I’m not sure how they calculated that, but I have used these relays before on my Inverted V / Marconi switching, and since these re what Array Solutions uses in their Rat Packs for years with no issues, this will be a fun project to try.
I will have to come up with the voltage matrix. In short:
|160, 40, 20, 15||DWN||1|