Antenne Topfkreis
Antennas/VHF UHFA simple vertical antenna for 70 cm band
Archive for July, 2009
A Simple Dual Band SSB Transceiver
Technical Reference/HomebrewHomebrew a dual-band transceiver with a crisp receiver and a clean SSB signal
Transistor Audio Preamplifier Circuits
Technical Reference/PreamplifiersDesign Guidelines for Bipolar Transistor Audio Preamplifier Circuits By Mike Martell N1HFX
Power amplifier for 2m rig
Technical Reference/Amplifiers/VHF AmplifiersAn RF power supply for 144 MHz schematics and instructions
An universal power supply for rigs
Technical Reference/Power SupplyVU3NSH article on high current universal supply for rigs
Radios Antigos
Antique Radios/CollectionsAntique radio collection from brazil, philips , philco, telefunken, blaupunkt, saba, mende, rca, ekco, pilot, general electric, bush and more
Ham Fax
Software/LinuxHamFax is an application for sending and receiving facsimiles in amateur radio and for receiving public facsimile broadcasts like weather maps. Supported interfaces are sound cards and the SCS-PTCII from Special Communication Systems.
PA3CQR Magnetic loop antenna
Antennas/Magnetic LoopPA3CQR practical experiments with magnetic loop antennas.
Dual Output 200 MHz RF Generator/Detector
Technical Reference/HomebrewDual Output DDS Based RF Generator/Detector with links for the associated QEX NimbleSig III article download by Tom, VA7TA
Remembering "Nautilus 90 North"
America desperately needed heroes in the late 1950s. Our country was still trying to recover from the nonvictory in Korea. Our space program was literally blowing up on the launch pads down at Cape Canaveral. Then the Russians launched Sputnik. That single event sent a shiver through the Free World.
The Amateur Radio Crossword Puzzler
Ham Humor — #1
Board Discusses Inappropriate Use of Amateur Radio, Strategic Planning, Other Issues at Second 2009 Meeting
The ARRL Board of Directors held its Second Meeting of 2009 July 17-18 in Windsor, Connecticut, under the chairmanship of President Joel Harrison, W5ZN. On Friday, the Board considered and acted on a number of recommendations from committees as well as motions by Directors. Saturday was devoted to reviewing and revising the ARRL Strategic Plan [...]
The K7RA Solar Update
No new sunspots yet, but a big surprise this week with aurora and a geomagnetic storm: Sunspot activity peaked around 0300-0900 UTC on Wednesday July 22, with K index as high as 6. The planetary A index for the day was 24. You can see the K index variation here. One nice result was aurora [...]
Surfin’: Getting Off The Grid
This week, Surfin’ explores the possibilities of getting electricity from your own resources.
FCC Continues BPL Debate
On July 17, the FCC issued a Request for Further Comment and Further Notice of Proposed Rulemaking (FNPRM), addressing the issues remanded to them by the US Court of Appeals. In October 2007, the ARRL took the Commission to court concerning the Commission’s Orders adopting rules governing broadband over power line (BPL) systems. In April [...]