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
[https://remoteqth.com/img/ZAW-WIKI/K9AY_FIX/1.png|noborder]
!!All parts you need - KIT
[https://remoteqth.com/img/ZAW-WIKI/K9AY_FIX/1.jpg|noborder]

!!The drill drawing
Paste the drawing on the box and fix it with some tape.
[https://remoteqth.com/img/ZAW-WIKI/K9AY_FIX/2.jpg|noborder]

[https://remoteqth.com/img/ZAW-WIKI/Bi-Dir_1out/10.jpg|noborder]

!!Schematic diagram

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


- version 2.3
[https://remoteqth.com/img/ZAW-WIKI/K9AY_FIX/fixR_maly.jpg|noborder]


!!Insert rest parts
[https://remoteqth.com/img/ZAW-WIKI/K9AY_FIX/5.jpg|noborder]


!! chooce the control way...
- By the jumper JP2 you can select controlling over coax or DC voltage on connector X3
[https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/v2.3/PCB1.png|noborder]

!!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.

[https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/v2.3/2.jpg|noborder]


!!Common-mode coax choke
- choke measurements
* [OK2ZAW.com Blog|https://ok2zaw.blogspot.com/2016/06/common-mode-current-choke-for-rx-cables.html]
[https://remoteqth.com/img/ZAW-WIKI/Bi-Dir_1out/40.jpg|noborder]

!!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
[https://remoteqth.com/img/ZAW-WIKI/Bi-Dir_1out/28.jpg|noborder]


[https://remoteqth.com/img/ZAW-WIKI/Bi-Dir_1out/29.jpg|noborder]

!!Solder the coax 
[https://remoteqth.com/img/ZAW-WIKI/Bi-Dir_1out/30.jpg|noborder]


[https://remoteqth.com/img/ZAW-WIKI/Bi-Dir_1out/31.jpg|noborder]


!!KIT - all parts assembled.
[https://remoteqth.com/img/ZAW-WIKI/K9AY_FIX/4.jpg|noborder]

!!Example of controller.

* [bigger schematic|https://remoteqth.com/img/ZAW-WIKI/K9AY_FIX/ovl.png]
- Injector to coax line:
[https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/inj.png|noborder]
- direction controller
[https://remoteqth.com/img/ZAW-WIKI/K9AY_FIX/ovl.png|noborder]



!!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]
[https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/mmana/ant.png|noborder]


!!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]