RX antenna - K9AY loops switch with FIXED Rload
This revision is from 2019/02/02 21:03. You can Restore it.
Current version 2.3
Assembled KIT
All parts you need - KIT
The drill drawing
Paste the drawing on the box and fix it with some tape.
Insert rest parts
chooce the control way...
- By the jumper JP2 you can select controlling over coax or DC voltage on connector X3
TRANSFORMERS winding - very important thing!
- for 50 ohm coax feed line : 2 turns on primar (coax) and 6 turns on secondar side (loop)
- for 75 ohm coax feed line : 2 turns on primar (coax) and 5 turns on secondar side (loop)
- In version 2.3 and higher, you can select Coax impedance by jumper JP3.
- Transformer should have 5 + 1 turns.
Wind the coax
- Wind the coax as is on the picture, there should be 7 or 8 turns.
- fix it by one binder and use second one to fix choke to the PCB
Solder the coax
KIT - all parts assembled.
K9AY loops design example.
- It is VERY recomended to place K9AY loop antenna as far as possible from metal towers, antennas and wires. This hepls to obtain better paramaters of antenna ( directivity and noise )
- K9AY Loop design page.
- MMANA file of my small design for 160 and 80m
