Plastic bottles are the coil form of choice on DXpeditions. Excellent.
Mark N5OT On 9/3/2019 5:55 AM, [email protected] wrote:
Hi Pete, Here is picture of coil I made to tune Inv. L at 9Y4 with 15-20 Ohm impedance. It was tuned in 2 steps: 1. calculate and wound coil to rise R close to 50 Ohm 2. adjust horizontal wire length back to desired freq. https://photos.app.goo.gl/7eVBt5t8yCAvsaZg7 Used thin wire for coil, not sure if it is right or not, used what I had there. 73 Arunas LY2ij /LY5E 2019 m. rugsėjo 1 d., 21:47 val., "N4ZR" <[email protected]> parašė:The other day a ham friend suggested using a coil ("hairpin") to match the low impedance of a well-radialed inverted L to 50-ohm coax. This struck me as a potentially-attractive alternative to a series vacuum capacitor, but I don't know enough to evaluate it. Thoughts? -- 73, Pete N4ZR_________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
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