K9AY version 2.0

Difference between revisions from 2017/01/04 09:37 and 2017/01/04 09:37.
!!Assembled KIT
[https://www.remoteqth.com/img/ZAW-WIKI/K9AY_VAC/8.jpg|noborder]

!!Why variable Rload???
- look at far field plots from MMANA
* [bigger MMANA far field|https://www.remoteqth.com/img/ZAW-WIKI/K9AY_VAC/mmana_vac_big.png]

[https://www.remoteqth.com/img/ZAW-WIKI/K9AY_VAC/mmana_vac.png|noborder]

!!The drill drawing
Paste the drawing on the box and fix it with some tape.
[https://www.remoteqth.com/img/ZAW-WIKI/K9AY_VAC/6.jpg|noborder]

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


* [bigger schematic diagram Version 2.0|https://www.remoteqth.com/img/ZAW-WIKI/K9AY_VAC/schema_big_V2.0.jpg]
- Schematic V < 2.0
[https://www.remoteqth.com/img/ZAW-WIKI/K9AY_VAC/schema.png|noborder]
* PLEASE ADD 100uF/35V CAPACITOR OVER C4 AND C5 IN RIGHT POLARITY !!!
- Schematic Version 2.0
[https://www.remoteqth.com/img/ZAW-WIKI/K9AY_VAC/schema_v2.0.jpg|noborder]



!!Voltage controlled resistor
* VTL5C1 - [DataSheet|https://www.google.cz/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjMpLusgpLOAhXI0xoKHdlDAeAQFgggMAA&url=http%3A%2F%2Fwww.excelitas.com%2Fdownloads%2Fdts_vtl5c1c2.pdf&usg=AFQjCNGXZnFAn7xDgRNRpZsmB9BF_ncS3w&sig2=PtA98Nt0fHi9Rc7qF0-DBA]
[https://www.remoteqth.com/img/ZAW-WIKI/K9AY_VAC/1.jpg|noborder]

- insert VAC plus to plus - check package
[https://www.remoteqth.com/img/ZAW-WIKI/K9AY_VAC/2.jpg|noborder]

!!Protection diodes
- solder 5 + 5 diodes
- these diodes protect Rload resistor against high power, electrostatic etc.
[https://www.remoteqth.com/img/ZAW-WIKI/K9AY_VAC/3.jpg|noborder]

[https://www.remoteqth.com/img/ZAW-WIKI/K9AY_VAC/4.jpg|noborder]

!!Insert rest parts
[https://www.remoteqth.com/img/ZAW-WIKI/K9AY_VAC/5.jpg|noborder]
- PCB mistake on version 2.0 - sorry for that
[https://www.remoteqth.com/img/ZAW-WIKI/K9AY_VAC/PCB-chyba.png|noborder]

- chooce the control way...
- Version < 2
[https://www.remoteqth.com/img/ZAW-WIKI/K9AY_VAC/remark.jpg|noborder]
- Version < 2



!!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)

[https://www.remoteqth.com/img/ZAW-WIKI/Bi-Dir_1out/20.jpg|noborder]

!!Front side
[https://www.remoteqth.com/img/ZAW-WIKI/Bi-Dir_1out/21.jpg|noborder]

!!Front side
[https://www.remoteqth.com/img/ZAW-WIKI/Bi-Dir_1out/22.jpg|noborder]


!!Common-mode coax choke
- choke measurements
* [OK2ZAW.com Blog|http://ok2zaw.blogspot.com/2016/06/common-mode-current-choke-for-rx-cables.html]
[https://www.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://www.remoteqth.com/img/ZAW-WIKI/Bi-Dir_1out/28.jpg|noborder]


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

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


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


!!KIT - all parts assembled.
[https://www.remoteqth.com/img/ZAW-WIKI/K9AY_VAC/7.jpg|noborder]

!!Example of controller.

* [bigger schematic|https://www.remoteqth.com/img/ZAW-WIKI/K9AY_VAC/ctrl_big.png]
- Injector to coax line:
[https://www.remoteqth.com/img/ZAW-WIKI/K9AY_VAC/inj.png|noborder]
- direction and VAC Rload controller
[https://www.remoteqth.com/img/ZAW-WIKI/K9AY_VAC/ctrl_small.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 ).
* [MMANA file of my small design for 160 and 80m|https://www.remoteqth.com/img/ZAW-WIKI/K9AY_VAC/mmana/K9AY_ZAW_160+80.maa]
[https://www.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://www.remoteqth.com/img/ZAW-WIKI/K9AY_VAC/ext/Observations_on_K9AY_receive_antenna.pdf]