K9AY fixed Rload version 2.3

Difference between revisions from 2019/02/02 21:03 and 1999/11/30 00:00.
!!!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.


!!Schematic diagram

* [bigger schematic diagram - version 2.3|https://remoteqth.com/img/ZAW-WIKI/K9AY_FIX/fixR.jpg]

- version 2.3

!!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.


!!Common-mode coax choke
- choke measurements
* [OK2ZAW.com Blog|https://ok2zaw.blogspot.com/2016/06/common-mode-current-choke-for-rx-cables.html]

!!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.

!!Example of controller.

* [bigger schematic|https://remoteqth.com/img/ZAW-WIKI/K9AY_FIX/ovl.png]
- Injector to coax line:
- direction controller

!!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|https://remoteqth.com/wiki/index.php?page=k9ay-design].
* [MMANA file of my small design for 160 and 80m|https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/mmana/K9AY_ZAW_160+80.maa]

!!K9AY loops - external links.

* [Tom N5EG: Some Observations on the K9AY Receive Directional Antenna|https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/ext/Observations_on_K9AY_receive_antenna.pdf]