Low Power AM Broadcast

Onno W. PurboOnno@indo.net.id

YC1DAV

Low Power AM 100mW – 20W MW AM Broadcast Band < Rp. 1 Juta / Transmitter

Referensi http://www.northcountryradio.com http://www.thebizlink.com/am/tech

/ http://members.nbci.com/medium

wave/circuits/poppet.html http://www.ramseyelectronics.com/

hk/hobbykits.htm

http://www.alphalink.com.au/~parkerp/nojun98.htm

K1ETP 5W AM QRP

NE1STX

EL 90 AM TX

The Poppet

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

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

Ramsey 100mW US$30

Ramsey AM 100mW US$130

Power Booster 1W AM US$40

AM88 LP AM XMTR

AM88 LP AM XMTR

Antenna Untuk LP AM

VK1PK End Fed Antenna

VK1PK L-Match & Antenna Coupler