K9AY version 2.3

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!!!Current version 2.3 -------------------------- !!Assembled KIT [https://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://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/mmana_vac_big.png] [https://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://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/6.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_VAC/v2.3/schema_big_V2.3.jpg] - Schematic Version 2.3 [https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/v2.3/schema_v2.3.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://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/1.jpg|noborder] - insert VAC plus to plus - check package [https://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://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/3.jpg|noborder] [https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/4.jpg|noborder] !!Insert rest parts [https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/v2.3/3.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_VAC/7.jpg|noborder] !!Example of controller. * [bigger schematic|https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/ctrl_big.png] - Injector to coax line: [https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/inj.png|noborder] - direction and VAC Rload controller [https://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 ). * [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]