RX antenna - K9AY loops switch with remotly VARIABLE Rload

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* [PCB Ver. 1 |K9AY version 1] * [PCB Ver. 2.0 |K9AY version 2.0] * [PCB Ver. 2.3 |K9AY version 2.3] !!!Current version 3.1 - Variable Rload with FIXed JUMPER ------------------------------------------------------------ !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 KIT|https://remoteqth.com/wiki/index.php?page=RX+antenna+-+K9AY+loops+switch+with+remotly+VARIABLE+Rload&action#Assembling_KIT] *[Schematic diagram|https://remoteqth.com/wiki/index.php?page=RX+antenna+-+K9AY+loops+switch+with+remotly+VARIABLE+Rload&action#Schematic_diagram] *[Jumpers|https://remoteqth.com/wiki/index.php?page=RX+antenna+-+K9AY+loops+switch+with+remotly+VARIABLE+Rload&action#Jumpers] *[Common-mode coax choke|https://remoteqth.com/wiki/index.php?page=RX+antenna+-+K9AY+loops+switch+with+remotly+VARIABLE+Rload&action#Common_mode_coax_choke] *[Example of controller|https://remoteqth.com/wiki/index.php?page=RX+antenna+-+K9AY+loops+switch+with+remotly+VARIABLE+Rload&action#Example_of_controller] !!Assembling 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 3.1|https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/sch3-1.png] - Schematic Version 3.1 [https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/sch3-1S.png|noborder] * Direction switching matrix table for DC control inputs ( apply +12V for logic 1 )[https://remoteqth.com/img/ZAW/k9ay++rc/vysvetlovaci/k9ay_DC_direction_matrix_850.jpg|noborder] * Direction switching matrix table for AC/DC voltages over the coax [https://remoteqth.com/img/ZAW/k9ay++rc/vysvetlovaci/k9ay_ACDC_direction_matrix_850.jpg|noborder] !!Rload resistors for VARIABLE and FIXED * There are TWO resistors. First 1k2 in paraller to VAC and second 750 R as option for FIXed Rload - see below. * NOTE! Solder 1k2 resistor on the botom side after the protection diodes! [https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/bb_web.jpg|noborder] [https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/cc_web.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] !!Inductors - there are two resistors. Both are 100uH. But L1 is for higher current. L1 is black axial inructor. L2 is small resistor size green one. [https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/d_web.jpg|noborder] !!Capacitors - solder 100nF YELLOW capacitors [https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/ff_web.jpg|noborder] - some older versions do have 470nF capacitor [https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/401.jpg|noborder] !!Protection diodes - solder 6 + 6 diodes - these diodes protect Rload resistor against high power, electrostatic etc. [https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/402.jpg|noborder] [https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/403.jpg|noborder] !!Insert PTC 100mA and rest parts - PTC EX10 - Varistors [https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/404.jpg|noborder] - rest parts [https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/405.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] !!FIXed Rload ! - You can use this VARiable Rload KIT as FIXed one. - Than you need only coax cable to control direction etc - Conect JP4 to SHORT - and you have fixed Rload abt 460 Ohm / 4W - DO NOT APPLY ANY VOLTAGE TO VTL! [https://remoteqth.com/img/ZAW-WIKI/K9AY_VAC/jmp3-1-fix.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. [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] * Direction switching matrix table for DC control inputs ( apply +12V for logic 1 )[https://remoteqth.com/img/ZAW/k9ay++rc/vysvetlovaci/k9ay_DC_direction_matrix_850.jpg|noborder] * Direction switching matrix table for AC/DC voltages over the coax [https://remoteqth.com/img/ZAW/k9ay++rc/vysvetlovaci/k9ay_ACDC_direction_matrix_850.jpg|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]