Archive for September, 2009

Homebrew SDR transceivers

Sep 29, 2009 Homemade

Homebrew SDR transceivers by radio amateurs.

Keywords: homebrew, SDR, transceivers, homemade, hamradio, amateur radio, block diagram, circuits, schematic, receiver, digital, module, kit, project, low cost, PIC.

homebrew SDR transceivers

HF SDR (Software Defined Radio) transceivers

HF SDR transceiver – YU1LM

Low power SDR HF I/Q S/H (Sample and Hold) transceiver CW,SSB.- ADTRX1 from 30 kHz-35 MHz with external LO

HF SDR transceiver

HF SDR transceiver called ADTRX1 (analog + digital) is compilation of the results and previously published designs. ADTRX1 is working to the 35 MHz and it is a very simple and promising design all with classic size thru holes components. It is very good introduction in to the new SDR technique of the HF transceiver design. Most of demanding specification for HF transceivers are in software now, not in hardware like in classic HF transceiver design. Part 1 is giving description main ADTRX1 board, results and basic connections

Software defined radio transceiver

Schematics diagram are available: read more

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Radio-orienteering – modifying fox hunting PIC asm – yo5at

Sep 24, 2009 Projects

I am going to modify a radio-orienteering (fox hunting) PIC asm (written by yo5ooe) code to fit the new IARU rules for the new type of fox hunting contest.

The current rule is:
The foxes are on a 5 minutes cycle. Fox 1 will transmit “MOE” in CW for one minute and then Fox 2 will transmit “MOI” for one minute and then Fox 3 will transmit “MOS” for one minute and then Fox 4 will transmit “MOH” for one minute and then Fox 5 will transmit “MO5″ for one minute.

The new rule is:
The foxes are on a 1 minutes cycle. Fox 1 will transmit “MOE” in CW for 12 seconds and then Fox 2 will transmit “MOI” for 12 seconds and then Fox 3 will transmit “MOS” for 12 seconds and then Fox 4 will transmit “MOH” for 12 seconds and then Fox 5 will transmit “MO5″ for 12 seconds.

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Free flash image gallery – yo5oee

Sep 19, 2009 FAQ

Would you like to display your favorites images inside an image gallery?

Download Free Flash Image Gallery

Select your images

Images should be JPGs and saved as non-progressive. It is preferably to put all images in the gallery folder.

Create thumbnails

Create thumbnails with an image editing program. Thumbnails should be at least 70×70 pixels (larger thumbnail images will be cropped).
Put all the thumbnails in the gallery folder. Thumbnails should be with different names from large images.

Edit images.xml

Open the file images.xml with a text editor (Notepad, TextPad or some other text editor…).
You will notice that the XML file has a special structure in order to describe the images in the gallery.
All images are described with the following XML tags located between the <images> and </images> tags.

<pic>
    <image>Location of the big image</image>
    <thumbnail>Location of the thumbnail</thumbnail>
    <caption>Description, title or name of the image</caption>
</pic>

Here is a example of an actual image.

<pic>
    <image>gallery/1.jpg</image>
    <thumbnail>gallery/s1.jpg</thumbnail>
    <caption>Some lamp on the ground</caption>
</pic>

You can place as many images as you want between the <images> and </images> tags describing each image in the way shown here.

Upload the Flash Gallery

Upload the Flash Gallery to your web server using FTP or other software. You can change the name of the demo.html file to whatever you want.

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301 redirect from http(s) non-www to www

Sep 19, 2009 Web Design

How to redirect http:// non-www to http://www?

Add this code into your .htaccess file:

?View Code BASH
#Always use the www. in the URL address
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]

How to redirect http:// non-www to https://www?

Add this code into your .htaccess file:

?View Code BASH
#Always use the www. in the URL address
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^(.*)$ https://www.%{HTTP_HOST}/$1 [R=301,L]

Setting up favicon.ico

Sep 19, 2009 Web Design

“A favicon (short for favorites icon), also known as a website icon, shortcut icon, url icon, or bookmark icon is a 16×16 pixel square icon associated with a particular website or webpage. A web designer can create such an icon and install it into a website (or webpage) by several means, and most graphical web browsers will then make use of it. Browsers that provide favicon support typically display a page’s favicon in the browser’s address bar and next to the page’s name in a list of bookmarks. Browsers that support a tabbed document interface typically show a page’s favicon next to the page’s title on the tab.” – Wiki

Create a favicon.ico and upload it to your server eg http://www.yoursever.com/favicon.ico (check it with your browser). Then add this HTML code into the <head> … </head> of your webpage.

?View Code HTML
<link rel="shortcut icon" type="image/x-icon" href="/favicon.ico">

Useful favicon related links:
Online favicon.ico generator
Another online favicon.ico generator
Create favicon.ico

How can I change ftp timeout – yo5oee

Sep 19, 2009 FAQ

In some cases when you upload a big file to a server, after the file upload had been finished the ftp program notify you that the connection timed out.
The timeout is controlled by the server. You can configure your ftp client to send noop command to the server in order to keep the connection open. Even this option is available, some servers ignores the noop command.
In this case contact your hosting company and ask to extend the ftp connection timeout.

I am using Krusader on Ubuntu but the timeout issue rarely appeared to me.

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Homemade / homebrew HF transceivers

Sep 17, 2009 Homemade

Homebrew transceivers by radio amateurs. Some of these are high performance transceivers, even they are homemade.

Keywords: homebrew hf, radio transceiver, homebrew ssb, homemade hf, homebrew vfo, homemade vfo, digital DDS, transceivers, homebrew hf transceiver, DDS VFO, ssb transceiver, homemade, hamradio, amateur radio, SSB, band, Single Sideband, USB, LSB, CW, receiver, transmitter, exciter, power amplifier, bandpass filter, automatic gain control (AGC), cw 80, ssb radio, homebrewing, QRP SSB transceiver, QRP CW, transceiver qrp, build ssb transceiver, 3.5mhz transceiver, HF all band SSB-CW, transceiver schematic, homemade hamradio.

Homemade HF transceivers:


HF multi-band transceivers (homebrew)


visit dxzone - click here
Visit DXZone – Technical Reference – Ham Radio homebrew and home-made


The HF all-band homebrew transceiver by jg1ead

The home made transceiver covers 3.5 to 3.6 MHz and is CW only. It has the following features:

Characteristics and composition:

  • Frequency coverage : 3.5MHz-28MHz 8band
  • Mode : SSB/CW
  • TX-final : 2SC1947
  • Power output : 1W
  • RX-RF amp : 2SK125*2(Grounded Gates)
  • 1stIF : 48.7265MHz
  • TX/RX 1st mixer : MiniCircuit MCL-1
  • RX 1st IF amp : MC1350P
  • 2ndIF : 11.2735MHz
  • TX/RX 2nd mixer : MiniCircuit MCL-1
  • RX-2nd IF : MC1350P*2

Circuit schematic of the local oscillator unit
80m transceiver site panel

Schematics diagram are available: homebrew transceiver


T03DSP High Performance Transceiver with DSP IF processing

T03DSP transceiver

The goal of this project was to build a high performance HF transceiver with DSP IF processing. I did not try to archive as high parameters as possible, I just tried to get most from the available technology (i.e. mechanical and electrical parts and assembly technology). I tried to keep the design as simple as possible. The design widely uses “software” techniques that allows easy modifications and opens new possibilities.

Features

  • Amateur radio bands (160m,80m,40m,30m,20m,17m,15m,12m,10m)
  • 0.25 Hz and more (two tuning speed for each mode is available), implemented adaptive tuning step (1x..20x)
  • USB, LSB, CW (Normal/Reverse), AFSK, RTTY (decode only by now), (PSK31 with decoder and coder will be implemented in software later)
  • Selectivity 100Hz-3000Hz bandwidth in 50Hz steps
  • Automatic memory keyer (built in)
  • Automatic contest number generation, 5 different number formats available
  • Digital RX:S-meter and calibrated input signal power meter
  • Digital TX:Output power, SWR and compression (displayed simultaneously)
  • 24h real time clock (powered from ionistor during power off periods)
  • AFC and tuning indicator in RTTY mode
  • Adjustable voice operated squelch for SSB mode
  • CAT system compatible with Kenwood command set
  • Built in dual tone generator for transmitter testing

T03DSP audio amlifier

T03DSP audio amlifier

Transceiver DSP

Transceiver DSP

Transceiver display

Transceiver display
Transceiver display
Transceiver display
Transceiver display
Transceiver display
Transceiver display
Transceiver display

Schematics diagram are available: High Performance Transceiver

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Pidgin – chat / instant messaging client – yo5oee

Sep 16, 2009 FAQ

Sometime your Yahoo Messenger stop to work. The reason can be anything or just a simple virus.
If you want to communicate easily with your friends/clients then it’s time to switch to another messenger software.

Pidgin (formerly Gaim) is a universal chat / instant messaging client.

Supported protocols

The following protocols are officially supported:

Download Pidgin for Windows.
If you’re a Linux user then probably you already have installed, if not then use Yumex/Synaptic manager to install it.

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CodeIgniter v1.7.2 Released

Sep 13, 2009 Codeigniter

EllisLab is pleased to release CodeIgniter version 1.7.2 for ready download.  What’s new?  Among other changes:

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Multilanguage CMS

Sep 13, 2009 Codeigniter

Codeigniter is a very fast PHP framework.
I started to use it some years ago. I’ve been working on a multi-language Codeigniter CMS base system. I want to make it extensible with plugins, modules and widgets.
The purpose to be multi-language with easy admin interface, compact code and fast.