From what I can surmise, the slim jim has a slightly lower radiation angle than vertical dipole antenna and is easier to mount, thus it is suitable to use for point-to-point communication VHF-UHF operation. It has a gain of about 2.8dBi-3.2dBi in free space and 4.8-5.8dBi when mounted at about 30feet from the ground. Here’s the result of MMANA-GAL :

Download the application now : countpetrol.xls

Thankfully somebody took the time to create a spreadsheet application that can calculate the effect of the new subsidy scheme on the new petrol price, and how much you can save from it (if any!).

Download the application now : countpetrol.xls

To show how significant the price increase :
You need to spend RM30 now as opposed to RM20 for the same amount of car fuel everyday.

To add to the problem, the electric tariff has been revised, and due to effect in July. Our nation is heading towards economic recession, and I think its time to cut on unnecessary spending.

Save your money and save every penny of what you earn for the rainy days. Here’s a tip on how to counter the effect of the increasing fuel price : Tips Menangani Harga Minyak Naik Mendadak

Here’s the detail of Kota Setar Amateur Radio Repeater Information :

Frequency : 145.525 MHz
Shift : – 0.600 MHz
Tone : 103.5

Apart from the surrounding Kota Setar area, the repeater is triggerable from Perlis, Langkawi and Sungai Petani, the repeater was erected and maintained by Kota Setar Amateur Radio Club

All licensed ham are welcomed to use this repeater.

The list is updated and maintained by Sebol. Please help him by adding Dutch products not on the list on his comment box.

But do you know the height of the tallest and biggest half-wave antenna ever built in the world? is it 30 meters? 50 meters? 100 meters? Nope.. the answer is 646.38 m or 2,120.67 feet high when measured from its base on the ground.

Unlike other ordinary radio tower which is build to ensure you can put the antenna at the highest point, the Warsaw radio mast acts as a half-wave antenna itself!

It height 646.38 meter is the exact length of the frequency it was transmitting which is 225kHz, most probably using this formula

half-wavelength = 300/freq * 0.5 * velocity factor
= 300/0.225 * 0.5 * 0.97
= 646 meter.

As comparison, my homebrew half-wave antenna is only 0.996 meter in length, and is drastically dwarf by the Warsaw radio mast radiator.

   

Completed in 1974, the Warsaw radio mast transmit public broadcast radio station using 2 megawatts on 225kHz frequency. It was also the tallest structure in the world (recorded on Guinness Book of Records) until it finally collapse on 1991 due to maintenance crew failure.

Despite its collapse and inoperability for more than a decade. The Warsaw radio mast still remained the tallest/biggest (and the only longwave LF ) half-wave antenna ever build in the world,

Impressive isn’t it? Take a look at the antenna site in Wikimapia.

Read more about Warsaw Radio Mast in Wikipedia.

For example :

If you are transmitting on 145 MHz frequency with 65 Watt of power using 15 meter RG-58 cable, the maximum effective power radiated by your antenna is just about half of the transmitting power (36.156 MHz).

But when you switch to RG-8 cable, the loss would be significantly lower, and your antenna would radiate 54 Watt of power.

Since the power loss is significant, it is advisable that you consider the choice of your feedline before setting up your station. In emergency or QRP situation, every 1 Watt counts.

If you have no other choice other than to use RG-58 cable, it is advisable to put your antenna as high as possible with the shortest amount of cable possible. This will save your rig a lot of hard work, and may actually get your signal to travel further than before

How much power loss in your feedline ? Check it at Coax Cable and Line Loss Calculator website