Low Power AM Broadcast

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Low Power AM Broadcast

• Onno W. Purbo
• Onno_at_indo.net.id
• YC1DAV

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Low Power AM

• 100mW 20W
• MW AM Broadcast Band
• lt Rp. 1 Juta / Transmitter

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Referensi

• http//www.northcountryradio.com
• http//www.thebizlink.com/am/tech/
• http//members.nbci.com/mediumwave/circuits/poppet
  .html
• http//www.ramseyelectronics.com/hk/hobbykits.htm
• http//www.alphalink.com.au/parkerp/nojun98.htm

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K1ETP 5W AM QRP
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(No Transcript)
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NE1STX
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(No Transcript)
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EL 90 AM TX
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(No Transcript)
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The Poppet
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(No Transcript)
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Komponen Pasif

• C1, C2, C13 0.5 uF
• C3 1 nF (1000 pF)
• C4, C5 10 uF electrolytic
• C6 10 nF (.01 uF)
• C7, C15 100 nF (.1 uF)
• C8, C16 330 pF
• C9 50 pF variable
• C10 200 pF
• C11, C12 1n8 (1800 pF)
• C14 68 pF
• C17 220 pF
• D1 1N4148
• D2 9 volt zener

• J1 microphone jack
• J2 RF output jack
• L1 60 turns, 38 SWG wire, T37-2 core
• L2 50 turns, 38 SWG wire, T37-2 core
• R1 560 K
• R2 4700 ohms
• R3 1K trimpot (mic. gain adjust)
• R4 270 K
• R5 100 K
• R6 560 ohms
• R7 33 K
• R8 5600 ohms
• R9 100 ohms

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Komponen Aktif

• Q1, Q3 BC109 (possible equivalents NTE123A,
  2N2222A)
• Q2 2N3819 or similar
• Q4 BFY51 (possible equivalents NTE128, 2N3053)
• RFC1 10 turns of small enameled wire on ferrite
  bead
• RFC2 1 mH, rated for 500 milliamps
• T1 12 turns primary, 2 turns sec. on half-inch
  binocular ferrite core

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Ramsey 100mW US30
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Ramsey AM 100mW US130
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Power Booster 1W AM US40
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AM88 LP AM XMTR
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AM88 LP AM XMTR
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Antenna Untuk LP AM
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VK1PK End Fed Antenna
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VK1PK L-Match Antenna Coupler