Difference between revisions from 2021/03/18 21:39 and 2019/05/07 12:37.* [PCB Ver. 1 |K9AY fixed Rload version 1]
* [PCB Ver. 2.0 |K9AY fixed Rload version 2.0]
* [PCB Ver. 2.3 |K9AY fixed Rload version 2.3]
!!!Current version 3.1 (last rev 2.2.2019)
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Quick Start Guide
*[Youtube videos|https://www.youtube.com/playlist?list=PLDl8rfKoc17R-iJAA1hu1wXwIrVvJ6ro3] - lsn to K9AY
*[K9AY LOOPs design|https://remoteqth.com/wiki/index.php?page=k9ay-design] - more size variants
*[Assembling the KIT|https://remoteqth.com/wiki/index.php?page=RX+antenna+-+K9AY+loops+switch+with+FIXED+Rload&action#Assembling_KIT]
*[Schematic diagram|https://remoteqth.com/wiki/index.php?page=RX+antenna+-+K9AY+loops+switch+with+FIXED+Rload&action#Schematic_diagram]
*[Jumpers|https://remoteqth.com/wiki/index.php?page=RX+antenna+-+K9AY+loops+switch+with+FIXED+Rload&action#Jumpers]
*[Common-mode coax choke|https://remoteqth.com/wiki/index.php?page=RX+antenna+-+K9AY+loops+switch+with+FIXED+Rload&action#Common_mode_coax_choke]
*[Example of controller|https://remoteqth.com/wiki/index.php?page=RX+antenna+-+K9AY+loops+switch+with+FIXED+Rload&action#Example_of_controller]
!!Assembling 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 3.1|https://remoteqth.com/img/ZAW-WIKI/K9AY_FIX/sch.png]
- version 3.1
[https://remoteqth.com/img/ZAW-WIKI/K9AY_FIX/sm-sch.png|noborder]
!!Insert rest parts
[https://remoteqth.com/img/ZAW-WIKI/K9AY_FIX/kit_all.jpg|noborder]
- small yellow Caps 104 = 100nF 3x
- yellow small polyester capacitor 104 1x
- bigger yellow PTC - EX10 1x
- black inductor 1x
[https://remoteqth.com/img/ZAW-WIKI/K9AY_FIX/CL.jpg|noborder]
- two blue Varistors
- two small resistors 1k
- two LEDs - pay attention to polarity! Long leg is +++
- Rload 2W resistor on the bottom side
[https://remoteqth.com/img/ZAW-WIKI/K9AY_FIX/led.jpg|noborder]
[https://remoteqth.com/img/ZAW-WIKI/K9AY_FIX/rload.jpg|noborder]
!!Jumpers
- By the jumper JP3 you can select 50 or 75 Ohm coax output
[https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/jmp3-1-imp.png|noborder]
- Jumper JP1 must be short if you want to control direction over coax
* '''{.redka#id color: #f23f37; font-size: 200%}⚠{/} NOTE: If you use external DC control, please disconnect JP1. If not, you will have DC voltage on the coax!'''
[https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/jmp3-1-coax.png|noborder]
- By the jumper JP2 you can select controlling over coax or DC voltage on connector X3
* '''{.redka#id color: #f23f37; font-size: 200%}⚠{/} NOTE: If you use external DC control, please disconnect JP1. If not, you will have DC voltage on the coax!'''
[https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/jmp3-1-way.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/trafo/transformer_winding_5-1_850.jpg|noborder]
[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
* Common mode current choke construction
* Wind 4 turns on one side than cross to another side of cores and wind rest turns.
[https://remoteqth.com/img/ZAW-WIKI/4-way/5.jpg|noborder]
[https://remoteqth.com/img/ZAW-WIKI/4-way/6.jpg|noborder]
[https://remoteqth.com/img/ZAW-WIKI/4-way/7.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.
- sri photo of older PCB version
[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]