RX antenna - K9AY loops switch with FIXED Rload

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* [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) ---------------------------------------------- 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]