I´m interested to make contacts with less than 1W, so I decided to build up an QRP attenuator to reduce the power down to -21dB.
Example:
Transceiver output 2,5W
-3dB = 1,25W
-9dB = 313mW
-15dB = 78mW
-21dB = 19mW
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Here We have a Wind Turbine package from ReDriven a Canadian establish Alternative Power Company. I just want to show folks how easy it is to lower this towe…
http://copaseticflows.appspot.com/hamtest Brief overview of the practice exam website.
Video Rating: 5 / 5
Beginning at 6 pm tomorrow evening (2200 UTC on Wednesday, October 22nd), ARRL Headquarters systems will be taken down to perform maintenance functions.
This will impact operations of Logbook of The World, Online DXCC, the Centennial websites, and e-mail coming in and out of the building. E-mail sent to ARRL HQ will be queued for delivery once the systems are restored to operational status.
The …
American Radio Relay League | Ham Radio Association and Resources
Digital Down Converter Filter for Software Defined Radio Receiver: Optimization of Equiripple FIR filter using MATLAB, System Generator, ModelSim, Synplify Pro, ISE Software and FPGA
The power consumption in a communication system depends on the technology of the processor and the number of processing stages in decimation part. Programmability in the decimation filter, allows it to adapt to the different channel bandwidths, interferers requirements of the different standards, while maintained the power consumption at a minimum. The appearance of various standards in communication technologies in the world requires a good technique that able to provide a compatible standard r
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It does not appear that US radio amateurs will gain a new band at 70 MHz anytime soon. The FCC has denied a Petition for Rule Making filed earlier this year by Glen E. Zook, K9STH, of Richardson, Texas, seeking to add a 4 meter band to Amateur Radio’s inventory of VHF allocations. Zook had floated the proposal in 2010, and his petition was dated January 27, 2010, but the FCC said it did not rec…
American Radio Relay League | Ham Radio Association and Resources
Because of ARRL website maintenance and upgrading, some website services will be unavailable from 0000 until 1000 UTC on Saturday, August 23 (ie, starting the evening of Friday, August 22, in US time zones) and again from 0400 until 1000 UTC on Monday, August 25.
Outside e-mail to @arrl.org addresses and @reflector.arrl.org addresses will be queued for later delivery. Logbook of The World (LoTW)…
American Radio Relay League | Ham Radio Association and Resources
The ARRL already has complained to the FCC that so-called “grow light” ballasts can generate severe interference on the HF bands. According to a recent article in The Coloradoan, retired electrical engineer Tom Thompson, W0IVJ, first noticed interference on 40 meters at his location in Boulder a couple of years ago. So, he coupled his own portable receiving loop with a direct-conversion receive…
American Radio Relay League | Ham Radio Association and Resources
Network service at ARRL Headquarters will be down overnight, Friday, May 2/Saturday, May 3, from midnight until 8 AM EDT (0400 to 1200 UTC on Saturday, May 3) to facilitate the upgrade of the ARRL computer network. During that time all ARRL Headquarters services will be down, including Logbook of The World and the ARRL Store. E-mail sent to @arrl.org addresses will be queued for delivery when t…
American Radio Relay League | Ham Radio Association and Resources
Internet service at ARRL Headquarters will go dark on Monday, April 14, from around 5 PM ET (2100 UTC) until around 10 PM ET (0200 April 15) in order to complete necessary maintenance.
Services affected will include e-mail to and from ARRL Headquarters (all incoming e-mail will be queued), access to the ARRL website, reflector traffic to and from ARRL Headquarters (all incoming reflector mail wi…
American Radio Relay League | Ham Radio Association and Resources
With the departure of Chairman Julius Genachowski and Commissioner Robert McDowell this past weekend, the FCC now only has three of its full complement of five Commissioners. Pending the Senate confirmation hearings for Tom Wheeler, President Obama’s pick to head the FCC, Obama has named Mignon Clyburn, the FCC’s ranking Democrat, to serve as Acting Chairwoman. The three remaining Commissioners…
American Radio Relay League | Ham Radio Association and Resources
FCC Commissioner Julius Genachowski and FCC Commissioner Robert McDowell both announced last week that they would be leaving the Commission. McDowell announced his resignation during the FCC’s open meeting on March 20, while Genachowski made his announcement in remarks to FCC staff on March 22.
Genachowski was nominated by President Barack Obama to lead the Commission in June 2009. McDowell — …
American Radio Relay League | Ham Radio Association and Resources
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