presentation for spark on january 3, 2012 by rob neece, kk4r, and bill conkling, nr4c
TRANSCRIPT
HOME BREWING FOR HAM RADIO
Presentation for SPARK on January 3, 2012by Rob Neece, KK4R, and Bill Conkling, NR4C
OUTLINE
Introduction Examples Links More Examples Show and Tell
INTRODUCTION
Home brewing includes anything you build from circuits to antennas.
There are many levels of home brewing Design and build from scratch Combine existing designs Club projects Partial kits and mini kits Major kits, small and large
INTRODUCTION
There are many techniques for circuit construction Printed circuit boards Perf board Point-to-point wiring Ugly construction Un-etched circuit boards
30M, 1 W TRANSMITTER WITH VXO
Ugly construction – the parts are soldered directly to the PCB. There is no etching pattern and no holes. Parts hold each other up and only ground connections attach to the board.
DESK MIC WITH RADIO SHACK ELEMENTPerf board construction and point-to-point wiring.
DIGITAL INTERFACE
Home designed printed circuit layout and PC boards ordered from a vendor.
HOME MADE CIRCUIT BOARDS
Left – laser printer mask and resulting circuit board, etched at home.Right – hand-masked circuit board for surface mount regulator board.
VENDORS, SOURCES AND LINKS
Almost All Digital Electronics
Elecraft, kits from major to mini
Fox Delta, small kits Hamtronics
, VHF & UHF Ramsey Small Wonder Labs
QRP Ten Tec
Emtech QRP tuners and rigs
K1EL WinKey kits NorCal QRP Club Ham
Radio Secrets -- web resource
N0HR.com homebrew and kit resource page
NR4C Spud Gun Project
CLUB KITS FROM NORCAL
Right – NorCal 40a 1 W transceiver kit with no point-to-point wiring.Left – QRP amp for 20 and 40 M, input 1 W, output 5 W.
MINI KITS
Left – NorCal QRP dummy load, surface mount parts.Right – Elecraft directional coupler with hand-wound inductors.
SWITCHABLE 1:1 AND 4:1 BALUN
Second generation MPARC club project (original design put together by N1LO). Special cores improved performance.
BALUN TEST RESULTS IN 4:1 POSITION
Note that the response is nearly flat from the KHz range to 54 MHz!
“SPUD” LAUNCHER
Air pressure operated launcher for hanging antennas. Upper left – special spool for line. Note the yellow plastic “spud”.