There is calculator for building magnetic loop antenna. Try this calculator, to see hows the performance before making you own magnetic loop...
CW ataupun Continuous Wave SSB ataupun Single Side Band CW SSB
Monday, April 29, 2013
Linux is new anymore, there are many custom Linux operating system that was designed for ham radio operators. Here are the list of famous Linux operating system for ham radio usage
1. KB1OIQ - Andy's Ham Radio Linux DVD - This is a remastered version of Ubuntu Linux. As of version 13, there are 32-bit and 64-bit versions available.
2. hamOS - A Debian based Live and Installable operating system for radio amateurs. hamOS contains many preinstalled ham radio applications as well as a custom menu. This respin is geared toward the newer linux user. hamOS uses the lightweight LXDE desktop environment and is therefore suitable for older hardware. Check out the GetExtras folder on the desktop to run some custom scripts that will automatically grab flash, codecs, and other non-libre software.
4. Harv's Hamshack Hack
5. Digipup - based on puppylinux (lightweight linux distribution)
6. Shackbox - Shackbox provide linux AND windows software like the famous ham radio deluxe, trunking software and a lot of other software related to electronics, antenna design and else.
7. Hamux - CentOS based repository with ham radio software.
However, you can choose any linux distro you like and install any ham radio applications that you desired. Since linux is opensource operating system, you can hack the source to suit your taste. Google, Yahoo also powered by linux operating system and small hardware such as switch, routers, acces point also powered by linux nowadays. Most of websites running on linux webservers. Happy Hamlinux-ing!
Friday, April 26, 2013
Wednesday, April 24, 2013
Add these rules to your iptables
1. iptables -N NOFBHTTPS
iptables -I FORWARD -m string --algo bm --string "facebook.com" -j DROP
iptables -I FORWARD ! -s 192.168.0.0/24 -m string --algo bm --string "facebook.com" -j DROP
Tuesday, April 23, 2013
1) Put on your USB drive, open terminal and type:
It will list all your connected drives. Search for your USB stick you want to use as swap and copy the UUID (everything inside these quotes UUID="XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX").
This represents the individual name of your device.
Also note the /dev/XXX point of your device.
2) Now unmount your device by typing:
sudo umount /dev/XXX (where XXX represents your device name)
3) Format your USB stick as swap, e.g. by terminal
sudo mkswap /dev/XXX (<-- be sure to use the correct device name here or you'll probably end up formatting the wrong drive!)
You can also use Gparted if you want GUI
4) Now you have to edit your /etc/fstab file, so type
gksudo gedit /etc/fstab
and enter the following
UUID=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX none swap sw,pri=5 0 0
(for all the Xs, use the UUID number you got by typing sudo blkid)
5) Now type
sudo swapon -a
For more info, man swapon
p/s: you can define priority between your HDD swap and USB swap using the pri=value. The higher value indicates higher priority. You also can adjust the swappiness on /etc/sysctl.conf, the swappiness sysctl parameter represents the kernel's preference (or avoidance) of swap space. Swappiness can have a value between 0 and 100. Setting this parameter to a low value will reduce swapping from RAM, and is known to improve responsiveness on many systems.
1. add this to /etc/fstab, cache-chromium /home/your_user/.cache/chromium tmpfs defaults,noatime,mode=1777 0 0
2. then rm -r /home/your_user/.cache/chromium (to delete everything you had cached)
3. and mkdir /home/your_user/.cache/chromium (to create an empty directory).
After reboot, the cache will be mounted in ram and you won't need to modify the launcher.
Why dont use ramfs ?
Primarily both ramfs and tmpfs does the same thing with few minor differences.
Ramfs will grow dynamically. So, you need control the process that writes the data to make sure ramfs doesn’t go above the available RAM size in the system. Let us say you have 2GB of RAM on your system and created a 1 GB ramfs and mounted as /tmp/ram. When the total size of the /tmp/ram crosses 1GB, you can still write data to it. System will not stop you from writing data more than 1GB. However, when it goes above total RAM size of 2GB, the system may hang, as there is no place in the RAM to keep the data.
Tmpfs will not grow dynamically. It would not allow you to write more than the size you’ve specified while mounting the tmpfs. So, you don’t need to worry about controlling the process that writes the data to make sure tmpfs doesn’t go above the specified limit. It may give errors similar to “No space left on device”.
Tmpfs uses swap.
Ramfs does not use swap.
Sunday, April 21, 2013
I am really satisfied with CQRLog for Linux. It support CW keying, general logging, DX cluster, eQSL, LOTW, hamQTH and QRZ.com search. It was developed by OK1CQR and OK1RR. It uses mysql as database server, cwdaemon for cw keying.
CQRLog also support for digital operation, transceiver control and WinkeyUSB keyer. But, it lack of support for contest templates, rotator control and also cw repeat message. Hopefully that the developers will add this support.
For more info, please visit http://cqrlog.com/
Saturday, April 20, 2013
As an amateur radio, what is our target? Well, everybody has their own target. Some of them wants to
1. Learn something new
2. Improve their skills and knowledge
3. Find new friends
4. Talk to their friends
5. Sell their products
6. Making profit from their events
7. Being glamour and known to all
8. Serve to others on different ways
9. Help on emcomm
10. Just to have their own callsign
It doesnt matter which one is your objective or target. Everybody has their own. But remember amateur radio roots. Being an amateur radio doesnt prove that we are already good and knowledgable. We need to learn more from others.
In the journey of learning, you will found someone that humble and willing to help you, and also someone who being unhelpful. If you means nothing to them, they will ignore you.
Amateur radio in Malaysia are willing to help you on anything if your surname is yang berbahagia, tan sri or dato sri. Thats the natural behaviour of malaysian. Malaysian sticks to obvious.
Malaysian will respect one with harta or takhta. Same goes to amateur radio. The roots are fading, no more exchangable knowledge, no more sharing session. Just clubs with their politics.
Disagreements leading to a new club. If you dont agree with them, you will make your own club, ruling wih your own rules. Blaming other for their ignorant. No use for educating, because they will attack your personal attitude.
Hijacking peoples ideas, events becomes normal here in malaysia. If the authority doesnt blame for what mistakes you have done, you will say that they feared you. Running from problem is the solution for many.
Telling others what you have found for free or on public media is wrong, they must come to you personally. Before the problem is getting worst, you will be the one who run from it. If the problem solved, you will find another way to destroy it. When the wrong being norm nowadays, people will take it as their culture. Backstabbing to be on top means nothing to your religion.
You will say religion and amateur radio is like oil and water, while pinay ham transmitting bible's recitation on the frequency. You cant not stand being defeated, you will always find other ways to prove that you already won without fighting.
Some people will say that it doesnt matter if you are amateur radio or not, as long as you have a radio.
2. Know your com port setting
3. Reassign your com port if your logging software doesnt support higher number ports.
4. Read the logging software manual on cw keying
Thursday, April 11, 2013
Tuesday, April 9, 2013
Battery voltage low
Spark plug dirty, broken, or maladjusted
Spark plug cap or high tension wiring trouble
Spark plug cap shorted or not in good contact
Spark plug incorrect
Pickup coil trouble
Ignition coil trouble
Fuel/air mixture incorrect:
Pilot screw maladjusted
Pilot jet, or air passage clogged
Air bleed pipe, bleed holes clogged
Pilot passage clogged
Air cleaner clogged, poorly sealed or missing
Starter plunger stuck open
Fuel level in carburetor float chamber too high or too low
Fuel tank air vent obstructed
Carburetor holder loose
Surge tank duct loose
Spark plug loose
Cylinder head not sufficiently tightened down
Cylinder, piston worn
Piston ring bad (worn, weak, broken, or sticking)
Piston ring/land clearance excessive
Cylinder head gasket damaged
Cylinder head warped
Engine not sufficiently warmed up after lash adjuster installation
Valve spring broken or weak
Valve not seating properly (valve bent, worn, or carbon accumulation on the seating surface)
Hydraulic lash adjuster damaged (worn, seizure, or spring broken)
Hydraulic lash adjuster oil passage clogged
Backfiring when decelerating:
Vacuum switch valve broken
Air suction valve trouble
Coasting enricher trouble
Carburetors not synchronizing
Carburetor vacuum piston doesn't slide smoothly
Engine oil viscosity too high
Drive train trouble
Final gear case oil viscosity too high
Air suction valve trouble
Vacuum switch valve trouble
Monday, April 8, 2013
Portable operation is one of the interesting activity for amateur radio operator. Imagine if we go somewhere else far away from city, such as moutainous place, seaview places or to the jungle.
Not many people will like this activity, but some will accept it as an recreational activity or to challenge themselves.
To those who are hikers, or backbackers, they usually prepared themselves with some nessary equipment such as
1. Instant food
2. Fire maker kit
4. Medical kit
5. Map and compass
6. Scouting knife
8. Nylon rope
9. Waterproof and sealed secondary clothes.
These item probably the basic must have items, anyone will usually add more as he prefer for the weather or condition he might go.
For ham radio, they usually avoid hardcore condition or weather. But some will take it as challenge. Operating on snowy weather could be a hard to forget memory. I saw a youtube video of steve wg0at who went to moutainous place and operate low power HF and VHF for the SOTA award. He might look old but his spirit is younger than me. He made lot of contact on snowy and windy weather alone. Thou he have some goat friends.
These are basic equipment for amateur radio who working portable
1. A transceiver, low or high power
2. A battery
3. Coaxial cable and ground wire
4. An antenna, usually wire because it is light and convinient
5. A CW keyer or a hand microphone
6. A log book and a pen
7. A shelter such as ponchor or a small tent.
8. Instant food
9. Map and compass
10. a 2 meters handy talkie.
Some places dont have good cellular coverage, so better be prepare with a 2 meters handy talkie. Some interesting awards which gave appreciations to adventurous ham who like portable operation is IOTA, SOTA and WFF awards.
Thursday, April 4, 2013
Estimated population of amateur radio in Malaysia is about 10 thousands. Most of them are class B, and class A callsigns is about 300 to 400. This is not official count, if you want exact number please ask MCMC.
Amateur radio outdoor activity in Malaysia, means that you go somewhere out from your home and do some ham radio related activities.
In Malaysia we have,
1. JOTA - jamboree on the air. Scouts activities, probably one or twice in a year. International and national communication. They went somewhere to any nearest scouts camp and operates there.
2. Lighthouse weekend - once in a year event. This event gathered Malaysian hams at any lighthouse. Chasing DX contact on HF. Not merely a contest, more on field day at lighthouse. Great event to promote lighthouse usage and history.
3. Contesting Expedition - some of international contest has expedition category. This is great event too, hams will gather up and do some dxpedition and contesting.
4. Simulated Emergency Test - this is emergency communication awareness program. International and also national.
5. Ham Fest - amateur radio festival, promoting amateur radio to public. There will be a portable station in ham fest park.
6. Marathon/Cycling Communication Aid - hams helping public to provide communication for these activities.
7. Field Day - hams happy day activity. DXing and also communicating with local hams. This event also good to promote amateur radio to public besides gather new and old hams.
8. Amateur Radio Direction Finding contest - find those beacon and win a prize activity. Not compulsory to ham.
9. Technical class / knowledge sharing session - usually held at mamak restaurant, eat and drink while exchanging topics and infos. Technical class usually about antenna, electric and electronics.
10. Flea market - hams meeting place and trading.
11. RAE and CW test center - you can meet old and new hams here coming and aiding their friend who will take the exam.
These event are good to promote amateur radio. These are where we can have an eyeball QSO, learn something and bring our non-ham friends.