{"product_id":"hand-made-rf-choke","title":"Artisan Hand-Made RF Choke | 500 W, All-Band 160-10m, Bench-Tested","description":"\u003cdiv style=\"max-width:860px;margin:0 auto;font-family:Arial,Helvetica,sans-serif;color:#555;line-height:1.65;\"\u003e\n\u003cp style=\"font-size:11px;text-transform:uppercase;letter-spacing:2.5px;color:#b8960c;font-weight:bold;margin:0 0 8px;\"\u003eArtisan · Hand-Made · Custom-Made · 500 W · 160 Through 10 Meters\u003c\/p\u003e\n\u003ch2 style=\"font-size:26px;font-weight:bold;color:#1a1a1a;line-height:1.25;margin:0 0 14px;\"\u003eThe Artisan Choke — Hand-Made, Custom-Made, Every Band 160 Through 10.\u003c\/h2\u003e\n\u003cp style=\"font-size:15px;margin:0 0 14px;\"\u003eCoax wound through ferrite by hand, the approach Jim Brown, K9YC, turned into a cookbook: turns multiply, so a wound choke puts far more choking on the outside of the shield than beads alone. Every one is custom-made, built by hand one at a time, and tested before it ships. It's large. It's beautifully made. And it works on every band a Greyline covers from 160 to 10.\u003c\/p\u003e\n\u003cdiv style=\"background:#fff;border:1px solid #DDD8CC;border-left:4px solid #B8960C;padding:12px 16px;margin:0 0 20px;\"\u003e\u003cp style=\"margin:0;font-size:14px;\"\u003e\u003cstrong style=\"color:#1a1a1a;\"\u003eHand-made means patience.\u003c\/strong\u003e Each one is built by hand, and at times there will be a backlog. Your order holds your place in line.\u003c\/p\u003e\u003c\/div\u003e\n\u003cdiv style=\"background:#1a1a1a;border-left:4px solid #B8960C;padding:18px 22px;margin:0 0 20px;\"\u003e\n\u003cp style=\"margin:0 0 8px;font-size:12px;font-weight:bold;color:#B8960C;text-transform:uppercase;letter-spacing:1px;\"\u003eWhere It Goes on a Greyline\u003c\/p\u003e\n\u003cp style=\"margin:0 0 8px;font-size:15px;color:#e8e8e8;\"\u003eAt the antenna end of the coax, to keep RF off the coax running back to the shack. Tuner in the shack: at the feedpoint, where the coax connects at the base of the pole. Remote tuner at the feedpoint: on the radio side of the tuner, between the tuner and the coax. Same job.\u003c\/p\u003e\n\u003cp style=\"margin:0;font-size:15px;color:#e8e8e8;\"\u003eWant the quietest receive? Add a second at the radio end of the coax, to lower the noise the coax picks up on its way back to the shack.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"font-size:19px;font-weight:bold;color:#1a1a1a;margin:0 0 10px;\"\u003eTwo Versions\u003c\/h3\u003e\n\u003cp style=\"font-size:15px;margin:0 0 6px;\"\u003e• \u003cstrong style=\"color:#1a1a1a;\"\u003e500 W, two cores — this one, $119.\u003c\/strong\u003e The one most stations want: every barefoot radio, most amplifiers run conservatively, and FT8 at 500 to 600 watts without the SWR moving.\u003c\/p\u003e\n\u003cp style=\"font-size:15px;margin:0 0 20px;\"\u003e• \u003cstrong style=\"color:#1a1a1a;\"\u003eHigh Power 1.5 kW, three cores, $159.\u003c\/strong\u003e For legal-limit stations, rated for CW and SSB. \u003ca href=\"\/ja\/products\/hand-made-rf-choke-high-power\" style=\"color:#b8960c;font-weight:bold;text-decoration:none;\"\u003eSee the High Power Artisan Choke →\u003c\/a\u003e\u003c\/p\u003e\n\u003cdiv style=\"background:#f7f4ec;border-top:3px solid #B8960C;padding:14px 18px;margin:0 0 20px;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-size:12px;font-weight:bold;color:#b8960c;text-transform:uppercase;letter-spacing:1px;\"\u003eMeasured on Our Bench\u003c\/p\u003e\n\u003cp style=\"margin:0 0 8px;font-size:15px;\"\u003eWe put an all-band unit on the network analyzer. Common-mode rejection: \u003cstrong style=\"color:#1a1a1a;\"\u003e38.6 dB at 1 MHz, 27.8 dB at 10 MHz, 12.9 dB at 28 MHz.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0;font-size:15px;\"\u003eIn plain terms: at 1 MHz, just below the 160-meter band, it cuts the unwanted current on the outside of the coax about 85 times; at 10 MHz, on 30 meters, about 25 times; at 28 MHz, on 10 meters, about 4 times. Strongest down low, and still working at the top of the HF dial. One choke for the whole station.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"font-size:19px;font-weight:bold;color:#1a1a1a;margin:0 0 10px;\"\u003eWhat Artisan Means Here\u003c\/h3\u003e\n\u003cp style=\"font-size:15px;margin:0 0 10px;\"\u003e\u003cstrong style=\"color:#1a1a1a;\"\u003eCoax, not wire.\u003c\/strong\u003e Many production chokes are wound with two-wire (bifilar) line, and if the turns aren't evenly spaced, the capacitance between them works against the choke. Coax holds its spacing. Each one is wound by hand with RG400, Teflon-insulated, which takes far more heat than foam-insulated coax.\u003c\/p\u003e\n\u003cp style=\"font-size:15px;margin:0 0 10px;\"\u003e\u003cstrong style=\"color:#1a1a1a;\"\u003eFerrite chosen for the job.\u003c\/strong\u003e Not just the standard mix: the ferrite is selected for the most series resistance, the part of a choke that actually absorbs the unwanted current.\u003c\/p\u003e\n\u003cp style=\"font-size:15px;margin:0 0 10px;\"\u003e\u003cstrong style=\"color:#1a1a1a;\"\u003eRoom to breathe.\u003c\/strong\u003e More power calls for more cores, and the waterproof box leaves air around them so heat has somewhere to go.\u003c\/p\u003e\n\u003cp style=\"font-size:15px;margin:0 0 10px;\"\u003e\u003cstrong style=\"color:#1a1a1a;\"\u003eEvery one tested.\u003c\/strong\u003e Each choke is bench-tested into a 50-ohm load before it ships. Not mass-produced, and never shipped untested.\u003c\/p\u003e\n\u003cp style=\"font-size:15px;margin:0 0 20px;\"\u003e\u003cstrong style=\"color:#1a1a1a;\"\u003eCustom-made for your station.\u003c\/strong\u003e Need a different connector or something special for your setup? Say so in the order notes and it's built that way.\u003c\/p\u003e\n\u003cdiv style=\"background:#fff;border:1px solid #DDD8CC;border-left:4px solid #B8960C;padding:14px 18px;margin:0 0 20px;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-size:12px;font-weight:bold;color:#b8960c;text-transform:uppercase;letter-spacing:1px;\"\u003eConnectors\u003c\/p\u003e\n\u003cp style=\"margin:0;font-size:15px;\"\u003eSO-239 on both ends, in a waterproof box. At the base of a Greyline, the ladder-line adapter's PL-259 plugs into one side and your coax into the other: no barrels, no extra joints.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp style=\"font-size:13px;color:#888;margin:0 0 12px;\"\u003eHow you'll know it's working: if your signal was showing up on the TV, the computer or the speakers, that should stop, and the noise floor on receive should come down. \u003ca href=\"\/ja\/collections\/rf-choke-1-1-current-balun-cmc-common-mode-choke\" style=\"color:#b8960c;font-weight:bold;text-decoration:none;\"\u003eBeads or wound? The two kinds →\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"font-size:13px;color:#888;font-style:italic;margin:0 0 10px;\"\u003eHam Radio is fun again! Pass it on… 73, Jon KL2A · Greyline Performance · 435-200-4902\u003c\/p\u003e\n\u003cp style=\"font-family:'Courier New',monospace;font-size:10px;letter-spacing:2px;text-transform:uppercase;color:#b8960c;margin:0;\"\u003eHand-made · WA1BXY\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Greyline Performance","offers":[{"title":"500 W","offer_id":50355282739477,"sku":null,"price":119.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/2571\/5779\/files\/IMG_2956_22158e45-b3fb-4133-a966-225eb788d994.jpg?v=1793651580","url":"https:\/\/greylineperformance.com\/ja\/products\/hand-made-rf-choke","provider":"Greyline Performance Antennas","version":"1.0","type":"link"}