[소개] 40m QRP TX 를 소개 합니다

비용은 $30 , dx는 $33 라고 하고 매우 간단한 40m / 출력 5 W  /   cw 송신기 입니다  여러사람이 함께 신청하여 만들어 보기를 원합니다.   <A href="http://www.wa0dx.org/wa0itp/ns40.html">http://www.wa0dx.org/wa0itp/ns40.html</A>   <CENTER>NS-40 Class E Transmitter</CENTER> <H1></H1> <H1> <CENTER>Designed by David Cripe, NMØS</CENTER></H1> <CENTER><A href="http://www.wa0dx.org/wa0itp/nm0s%20bio.html">Designer's Radio Bio</A></CENTER> </B) <CENTER> <IMG height=300 src="https://img1.daumcdn.net/relay/cafe/original/?fname=http%3A%2F%2Fwww.wa0dx.org%2Fwa0itp%2Fns40popbd.jpg" width=450></CENTER>   <CENTER><A href="http://www.wa0dx.org/wa0itp/w5jayjpegs.html">Jay Bromley W5JAY's Build Pictures</A></CENTER>   <H1>General Description</H1> The NS-40 Transmitter is an upgraded version of the overall winner in the FDIM 2008 Homebrew Contest. It is a truly unique QRP transmitter design. NS stands for No Simpler, so this is the No Simpler 40 Meter Transmiter. Why is it called the No Simpler? Because there are only 14 electronic components, and NO TOROIDS or COILS of any kind to wind - NONE! All inductors are incorporated directly on the PC board as etched spirals. This is an ideal first kit for budding homebrewers and will also appeal to the seasoned QRP'r due to it's innovative design. Just because this is a simple transmitter, doesn't mean that there is a compromise in performance. The transmitter incorporates a two transistor MOPA (Master Oscillator-Power Amplifier) circuit, with a 2N7000 crystal oscillator driving the IRF510 Class E final. Both are keyed for a clean, click-and-chirp-free signal. The innovative Low Pass Filter (LPF) provides harmonic rejection to greater than -50 dBc. The signal is a clean 5 watts into a 50 ohm load. Using the rugged and low-cost IRF510 MOSFET this transmitter utilizes a CLASS-E final amplifier for maximum efficiency and reliability. The 2N7000 oscillator easily drives the final to a full 5 watts out while running at comfortable temperatures. The PA heat sink helps the final accommodate accidental high SWR (>5:1) excursions while tuning or trying out a new antenna. As mentioned above there are no toroids or other coils to wind. That's because David has incorporated all necessary coils as PRINTED CIRCUITS on the PC board, i.e. SPIRAL-PC-TRACE INDUCTORS. While this may be common at VHF and UHF, we believe this is a first for a 40 meter application. You have to see and build it to believe it. The PC board is the size of a post card - and actually has a blank QSL card form printed on the back. You could put a stamp on the bare board and mail it! The kit comes with all components, 7030 kHz crystal, pc board, mounting hardware, and heat sink. All components are through hole mounted. This is a very easy kit to build and populating the board will take an experienced builder only about 20 minutes. The cost of the kit is $30, DX orders please add $3.00, which includes first class postage, shipping, and handling. All profit will go toward funding OzarkCon 2009. The size of the pc board drives the cost of the kit. Board prices, including tooling costs, continue to climb so the price of the kit came in a little more than we had expected, but it is a great kit anyone will enjoy building. Specifications:    5 watts at 13.6 volts, Harmonic rejection better than -50 dB Manual and Supporting Documents <A href="http://www.wa0dx.org/wa0itp/ns40manual.pdf">Assembly Manual</A> <A href="http://www.wa0dx.org/wa0itp/ns40schematic.pdf">Schematic</A> <A href="http://www.wa0dx.org/wa0itp/partslist.pdf">Parts List</A> <A href="http://www.wa0dx.org/wa0itp/otherdox.html">Educational and Supporting Information, Includiing Class E Design</A> Ordering Information Please send your check or money order for $30 (DX $33) made out to "4SQRP Group" and payable in US funds to: Terry Fletcher, WAØITP 1305 Casper Dr Ottumwa, IA 52501