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SDR࣌୅ͷFMड৴ ϚϧνύεϞχλͱ ϚϧνύεϑΟϧλ Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 1

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Kenji Rikitake Γ͖͚ͨ ͚Μ͡ ྗ෢ ݈࣍ 5-OCT-2019 BCL Akihabara Mee6ng Akihabara T-Space Taito, Tokyo, Japan @jj1bdx Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 2

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ٕज़࢜ʢ৘ใ޻ֶ෦໳ʣ ྗ෢݈ٕ࣍ज़࢜ࣄ຿ॴ ॴ௕ ϖύϘݚڀॴ ٬һݚڀһ BCLྺ 46೥ ࠷ۙ͸SDRͷݚڀ։ൃத ͖ͤ΍·͞ΜͷإΛݟʹདྷ·ͨ͠ Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 3

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ࠓ೔ͷ࿩୊ FMͷ඼࣭Լ͛ΔϚϧνύε ௚ަมௐ → ϚϧνύεϞχλ దԠϑΟϧλ → ϚϧνύεϑΟϧλ Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 4

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FMͱϚϧνύε ෳ਺ܦ࿏Λ௨Δి೾ͷׯব ׯবੑϑΣʔδϯάͰৼ෯͕มԽ ৼ෯ͷมԽ͸ଈࠁҐ૬ͷ࿪Έ Ґ૬͕࿪Ήͱͱͯ΋ෆշͳԻ͕͢Δ Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 5

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ϚϧνύεϞχλ ͳΜͱ͔Ϛϧνύεͷ౓߹͍ΛϞχλʔ͍ͨ͠ ௚ײతʹଌఆͰ͖ͳ͔ͬͨ Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 6

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FMͷεςϨΦࠩ৴߸ Ի੠ଳҬͷDSB 38kHzͰมௐ 19kHzͷύΠϩοτ৴߸ʹಉظ Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 7

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AMͷ௚ަมௐ AM͸2ͭͷ৘ใΛӡ΂Δ sin͸ͲΜͳʹ͕Μ͹ͬͯ΋cosʹ͸ͳΒͳ͍ cos͸ͲΜͳʹ͕Μ͹ͬͯ΋sinʹ͸ͳΒͳ͍ ͳΒcosͱsinͰ2ͭ৘ใ͕ӡ΂ͦ͏ Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 8

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௚ަมௐϚϧνύεϞχλ(QMM) Brian Beezley, K6STIʹΑΓߟҊ sinͰมௐͨ͠৴߸͸cosͰ͸ݕग़Ͱ͖ͳ͍ɺ͸ͣ ͔࣮͠͠ࡍʹ͸࿪Έ͕ൃੜͯ͠৴߸͕ग़ͯ͘Δ ͩͬͨΒͦͷ࿪ΈΛcosͰݕग़ͯ͠Ϟχλͯ͠ΈΑ͏ Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 9

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QMMͷར఺ ΄ͱΜͲͷ์ૹʹద༻Մ ԻͰग़ͯ͘ΔͷͰΘ͔Γ΍͍͢ Իͷେ͖͞ͰϚϧνύεͷࠅ͕͞Θ͔Δ Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 10

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࣍ͷ࿩୊ FMͷϚϧνύεϑΟϧλ Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 11

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ϚϧνύεϑΟϧλ ϚϧνύεͰ࿪Μͩ৴߸Λݩʹ໭͢ Ͳ͏΍ͬͯ? Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 12

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FMͷϚϧνύε࿪Έ FM͸ૹ৴࣌ৼ෯Ұఆ ෳ਺ͷ࣌ؒࠩͰ౸ணͨ͠৴߸͕ׯব Ϛϧνύε࿪Έ͸ৼ෯ʹݱΕΔ Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 13

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΍ͬͯ͸͍͚ͳ͍͜ͱ ৼ෯Ұఆʹڧ੍ͯ͠΋࿪Έ͸ফ͑· ͤΜ! Ϧϛολ͸ແҙຯͰ͢ Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 14

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ݪཧʹ஧࣮ʹߟ͑Δ ෳ਺ͷ஗Ԇ৴߸͕ׯব͍ͯ͠ΔͷͰ͋Ε͹ɺ ͦͷׯবͷٯԋࢉΛߦͬͯऔΓআ͍ͯ΍Ε͹ Α͍ Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 15

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۩ମతͳํ๏ ஗Ԇ৴߸Λଧͪফ͢ϑΟϧλΛ࡞Γɺͦͷ ϑΟϧλͷޮ͖ํΛ࿪Έ͕ͳ͘ͳΔΑ͏ʹஞ ࣍ௐ੔͍ͯ͘͠ ͦΜͳ͜ͱ͕Ͱ͖Δͷ͔? Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 16

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దԠϑΟϧλΛ࢖͑͹Ͱ͖Δ ໨ඪ: ৼ෯ΛҰఆʹ͢Δ ৼ෯ͷࠩΛޡࠩͱ൑அ͢Δ ޡࠩ஋Λ࢖ͬͯϑΟϧλΛௐ੔ Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 17

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దԠϑΟϧλͷ࣮૷ྫ 1980೥୅ʹ࿦จൃද 1 ྛً඙ࢯʹΑΔFMDDC-3 ྗ෢ʹΑΔairspy-fmradion 1 ๬݄ ޹ࢤ, Ӌௗ ޫढ़, దԠσΟδλϧϑΟϧλʹΑΔFMϚϧνύεͻͣΈࣗಈআڈͷҰํࣜ, ςϨϏδϣϯֶձࢽ, 1985, 39 ר, 3 ߸, p. 228-234, ެ։೔ 2011/03/14, Online ISSN 1884-9652, Print ISSN 0386-6831, h>ps:/ /doi.org/ 10.3169/itej1978.39.228, h>ps:/ /www.jstage.jst.go.jp/arHcle/itej1978/39/3/39_3_228/_arHcle/-char/ja Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 18

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airspy-fmradion 2 Airspy HF+΍RTL-SDRͱMac΍Raspberry Piͷ૊Έ߹ΘͤͰಈ࡞ ߴڃFMνϡʔφʹඖఢ FMԕڑ཭ड৴ʹ΋ޮՌ ઈࢍ։ൃத 2 h$ps:/ /github.com/jj1bdx/airspy-fmradion Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 19

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Thank you Ques%ons? Kenji Rikitake / BCL Akihabara Mee4ng 5-OCT-2019 20