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How to find a broken or shorthened point of coaxial cable? PDF Print E-mail
Suddenly increases the SWR of your antenna? The antenna seems to be good, RIG, too? Maybe there is a fault in the coaxial cable!

There are two usual faults:
1. Broken coaxial cable
2. Shorthened coaxial cable
Read more...
 
Superb preselector for contesting PDF Print E-mail
Contesting is very popular part of amater radio operation. But it’s not only the hardest test for operator but also for the equipment. In the same time are on the band hundreds of sigs. Our receiver must process a various signals from the weakest to the strongest from the stations in our area which are overloading the receiver. This is a hard job for every receiver.

If we got a huge QRM from the neighbour stations it’s a time to built the front-end filter called preselector. Preselector is a special, very selective RX filter circuit. Preselector is passing through only few kHz, all other signals are strongly rejected (at least –70 to –80 dB).
Read more...
 
Two voltages from the transformer PDF Print E-mail
Two voltages from one transformer By introducing a home made tube power amplifier into the life we will appreciate an advantage to set the anode lower than is in normal operation. Constructors are using regulation auto-transformer or transformer taps. But there is a very simple solution how to get two voltages from one transformer: switching a rectifier type.

See the schematic diagram left. In the first position is to transformer switched Graetz rectifier and DC voltage on the electrolytic capacitor is an AC voltage multiplied 1,41 (e.g. 100V AC x 1,41 = 141V DC). In the second position is switched full-wave rectifier, DC voltage on the electrolytic capacitor is an AC voltage multiplied 2,82 (e.g. 100V AC x 2,82 = 282V DC). So we could easily get two voltages from one transformer.
 
2 element wire yagi for 80m band PDF Print E-mail
Wire antennas are easy and cheap to built. Many amateur radio operators are using for low bands simple wire antennas that are hanged too low to the ground. Radiation angle is 90 degrees, antenna is radiating most of energy to the skies. This is the main reason why is their perfomance decreased by many dB.

There are two solutions: move antenna higher than actually is hanged or use an other antenna. The first is hard to made. But try to take a think about the second: the ARRL Antenna Handbook says in the chapter about two element yagi antennas: the most powerful antennas. Adding only one element to the dipole we got an advantage of lowering radiation angle, good feedpoint impedance and directional radiation. We have deigned a 2 element wire yagi for 80m band as an answer for this request...
Read more...
 
WI-FI antenna PDF Print E-mail
Look through the WI-FI antennaWI-FI band (2.45 GHz) is not so far from 2.3 GHz what is a radioamateur band 13 cm. An idea of G6KSN was the base how to build own WI-FI antenna.

I have compared three WI-FI antennas: original from AP, home made DL7KM (twin quad) and 10-element yagi loop. The last is the best. It's not a problem to copy signal from AP in distance 4.5 km!

The building is relative easy (easier than it looks). Things needed: PCB, N-type connector, piece of thin 50 ohm coax, some Cu wire with 1,5 mm diameter, Cu tube 8 – 12 mm, knife, soldering iron, etc.
Read more...
 
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Results 10 - 18 of 29
DX World of Ham Radio
DX News / Choice Snippets of Info

CX1F - San Gabriel Island, SA-057
Activity from the San Gabriel Island (SA-057) under the CX1F callsign, postponed the last month because of weather and sea conditions will finally take place on December 13th. QRV 80, 40, 20, 15, 10 and 2 meters, propagation permitting. QSL via CX2FAA       


eHam.net News
eHam.net Newsfeed

DX News -- ARRL DX Bulletin #50:
This week's bulletin was made possible with information provided by NC1L, the OPDX Bulletin, DXNL, 425 DX News, The Daily DX, Contest Corral from QST and the ARRL Contest Calendar and WA7BNM web sites. Thanks to all.

KN4LF Propagation Forecast #2008-35:
KN4LF Propagation Forecast #2008-35:

Ham Operators Connect Plantation to World:
PLYMOUTH - The Whitman Amateur Radio Club conducted a two-day special event at Plimoth Plantation the weekend following Thanksgiving. Twenty-two area amateur radio operators (or HAMs) set up six base stations and portable antennas and exchanged contacts with 216 other amateur radio operators in 32 states, 8 foreign countries and 3 Canadian Provinces, according to club President Paul Burbine (N1VTI). The HAM operators spread the word about Plimoth Plantation over the airways, explaining about the living museum and the amazement of visitors who interact with interpreters trained to explain the realities of early Colonial life, in the language of 17th century without acknowledging life beyond the 1620s.


ARRL Amateur Radio News
The National Association of Amateur Radio

ARRL HQ Welcomes New Membership Manager
The ARRL is pleased to welcome Membership Manager Diane Petrilli, KB1RNF, to the Headquarters staff in Newington. Petrilli's key areas of responsibility include programs and activities that directly affect membership growth, engagement and retention. Petrilli is taking over the position from Katie Breen, W1KRB. Breen left in October.

ARRL Continuing Education Online Course Registration
Registration remains open through Sunday, December 21, 2008, for these online course sessions beginning on Friday, January 2, 2009: Amateur Radio Emergency Communications Level 1, Radio Frequency Interference, Antenna Design and Construction, Technician License Course, Analog Electronics, and Digital Electronics.

ARISS Celebrates International Education Week
With all the educational opportunities the Amateur Radio on the International Space Station program (ARISS) provides, it's no wonder that the organization has captured the attention of the US Department of Education (DOEd). According to ARRL ARISS Program Manager Rosalie White, K1STO, the DOE has been tracking ARISS's activities for a long time: "The Department of Education invited ARISS to help celebrate the ninth annual International Education Week (IEW) by coordinating three contacts with the International Space Station (ISS) during IEW, November 17-21. How could we say no?" International Education Week is a joint initiative of the US Department of Education and US Department of State.


Make More Miles on VHF
Make More Miles on VHF

Updated: 2008-12-03 at 20:17 UTC
More info at www.MMMonVHF.de

IQ3AZ/p
A group of IV3-operators will be active in MS from JN66 square during Geminids shower, taking part in BCC MS-Contest The group will try as well having a MMMonVHF DXBlog online to spread infos (NO LOG during Contest!).

EI/ON5GS/P
Dirk, ON5GS, will be qrv serveral days from my "berlingo" shack with 4x4el vertical stack and 200W during BCC MS-Contest. He try setup as well a MMMonVHF DXBlog to spread infos (NO LOG during Contest!)...


Southgate Amateur Radio Club RSS Feed
A selection of circuits, tips, news and humour

Amateur Satellite Beginners Slides
The Powerpoint slides used in the satellite beginners session at the Leicester Amateur Radio Show, are now available on the web

CubeSat-sized linear transponder developed
William Leijenaar, PE1RAH, has developed a small 435 to 145 MHz (mode UV) linear transponder that will fit into a cubesat

DX News from the ARRL
The American Radio Relay League's round-up of the forthcoming week's DX activity


MØMCX
Amateur Radio Operator

160m SSB Club Calls Contest - November 2008
107 in the log. I’ve no idea what my score was since I used N1MM’s DX Serial Contest template to do the logging and the miscellaneous field for logging random text did a hopeless job of being able to edit long club names efficiently. The last time I entered this contest, my log was called into [...]

Waterproof PL259 connectors for Ecoflex
I’ve been lucky enough to purchase 100 meters of Ecoflex 15 recently and the solderless connectors are awesome. Available for Aircell 7 (RG213 replacement) and Ecoflex 10 (Westflex replacement) and this giant 15mm diameter stuff, once fitted they are completely waterproof. My experience with all these products started with me laying down a few runs for my [...]

SSB Field Day 2008 - M0XXT
2008 will go down as a wet year. Both VHF NFD and SSB FD was a soaking experience. Luckily, as with most close knit teams, we laughed it off and worked through it, however a tough act all the same. I didn’t take too many photos due to the extreme wet weather however I managed [...]


Oliver's Blog
My personal blog about Photography, Linux, HAM Radio and everything else...

How to configure postfix to reject spams
Few days ago I have published quick how-to about how to configure postfix as backup MX. I am starting to like postfix more and more, it is very easy to configure and to deal with. One of the problems you will find out when you use backup MX, that it can be put down on its knees [...]

Configuring Postfix to act as a backup MX server
Lately I have been playing with Postfix, which I needed to use as backup MX for some of my domains. Initially, I was using Zimbra, but I would have to have quite powerfull server to run Zimbra for just forwarding emails / setting it up as backup MX server. Postfix is in this case much [...]

GB0SH 2008 is back!
In the last few years I have attended Special Even Station - GB0SH with a group of my friends in West Wales. This year it would be our 4th time visiting Strumble Head Lighthouse on the West cost of Wales, by Fishguard. This year there will be just 5 of us. Here is the information we [...]


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