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Rabu, 22 April 2009
Minyak Masak Untuk Minyak Pelincir Kereta


Ada brani ke gune minyak nyiur
Subjek: Minyak SAJI.
SEREMBAN,(Bernama) -- PERCAYAKAH anda bahawa minyak masak berasaskan minyak kelapa sawit boleh digunakan sebagai minyak pelincir untuk kenderaan anda?
Malahan sudah terdapat segelintir penduduk di Negeri Sembilan menggunakan minyak masak sebagai minyak pelincir atau minyak hitam untuk kereta mereka tanpa menghadapi sebarang masalah.
Pengurus Pemasaran Sekolah Golf Michael Ismail, Nik Safian Afzani Omar berkata, beliau telah menggunakan minyak masak yang dibeli pada harga RM2.50 sepaket untuk enjin kereta Kancilnya.
"Kancil saya menggunakan tiga liter minyak hitam. Jadi, saya tuang dua paket setengah minyak masak untuk menyamai kuantiti itu. Dahulu, kalau servis minyak hitam, saya berhabis sehingga RM130, tetapi sekarang kurang RM10," katanya.
Jika dahulu beliau menggunakan minyak hitam semi sentitik jenama Castrol, kini Nik Safian Afzani menggunakan 'minyak hitam' yang dibelinya dari sebuah pasar raya.
Menurutnya, selepas menggunakan minyak masak sebagai minyak hitam, suhu enjinnya sangat rendah dan meter suhu tidak pernah lebih dari satu takuk.
Nik Safian berkata, ketika menghantar kereta ke sebuah bengkel kenderaan untuk ditukar penapis minyak, pekerja bengkel tersebut terkejut apabila mendapati keretanya menggunakan minyak masak sebagai minyak hitam tetapi mengakui ini merupakan alternatif terbaik sebab harga minyak pelincir pada hari ini sudah naik.
Sementara itu, pencipta alat penjimat minyak kereta berasaskan gas hidrogen dan air, Hisham Abdullah, 43, turut menggunakan minyak masak sebagai minyak hitam untuk kereta Proton Iswaranya.
Beliau sudah menggunakan bahan itu setahun yang lepas dan mendapati tidak ada kesan negatif menimpa keretanya.
Bekas jurutera sebuah syarikat Jepun serta graduan dalam bidang ekonomi dan kejuruteraan dari Universiti Arkansas , Amerika Syarikat itu berkata: "Minyak kelapa sawit merupakan minyak paling sentitik, tetapi kita tidak tahu mengenainya."
Mekanik kereta, Mohd Tajuddin Jalil pula, mula mengetahui mengenai rahsia minyak masak sebagai ganti minyak hitam kira-kira dua tahun lalu selepas bertemu dengan seorang pakar minyak dari luar negara.
Sejak itu, beliau menggunakan minyak masak berasaskan kelapa sawit sebagai minyak hitam keretanya, malahan beliau mengenali 67 pengguna kereta di Negeri Sembilan yang menggunakan minyak masak sebagai pelincir enjin kereta mereka.
"Hanya minyak masak berasaskan kelapa sawit sahaja boleh digunakan sebagai minyak hitam. Jangan pakai minyak masak berasaskan jagung, sayuran atau kacang kerana minyak ini pada suhu sejuk akan menjadi beku," katanya.
Katanya, harga minyak hitam keluaran pelbagai syarikat kini meningkat dengan sebotol empat liter minyak hitam semi sentitik kini berharga RM160 dan minyak sentitik sepenuhnya, mencecah RM200.
Bagaimanapun, beliau menasihatkan orang ramai supaya menukar gasket kereta mereka kepada jenama yang lebih baik sebelum menggunakan minyak masak sebagai pelincir enjin kereta.
Orang ramai juga boleh melayari laman web http://www.nordicgroup.us/oil.htm The300 Mile Facts untuk maklumat yang sama. - Bernama
Rabu, 15 April 2009
Howto - 2 Meter Slim Jim antenna from Ordinary Wires
Howto - 2 Meter Slim Jim antenna from Ordinary Wires
Slim Jim (J Integrated Match J-Pole) is probably the most easiest and powerful 2 meter antenna to build provided you have the exact measurement and material to build it.
This how to will show you how to build a 2 meter slim jim antenna from ordinary insulated copper wire commonly used for carrying AC (alternate current) electricity in your household.
Slim Jim construction basic
I am not only going show you the measurement of slim jim antenna for specific frequency, but I’m going to show you how to calculate slim jim antenna by your own using the basic formula below.
Basic Slim Jim Idea
The figure above shows that the longest side of slim jim is 3/4 wavelength long and the shorter side of the slim jim consist of 1/2 wavelength and 1/4 wavelength long seperated by a gap.
The feedline (coax cable) is normally connected 1/20 wavelength from the bottom of the slim jim antenna with the center conductor connected to the longest side and the shield/braid is connected to the shorter side.
Building the Slim Jim antenna
This guide assume you want to build a slim jim antenna that centered on 146MHz.
Calculation
The formula for calculating wavelength in metric system is 300/(freq MHz)
Using the formula from the figure, we have :
300/146 = 2.055 M
Wavelength = 205.5 cm
Wavelength x copper wire velocity factor = 205.5 cm x 0.94
= 193.17 cm
3/4 wavelength = 193.17 x 0.75
= 144.88 cm (57″)
1/2 wavelength = 193.17 x 0.5
= 96.585 cm (38″)
1/4 wavelength minus gap = 193.17 x 0.25 - 2.6 cm
= 45.69 cm (18″)
Coax tap = 193.17 x 1/20
= 9.6 cm (3 3/4″)
Building Materials
* 3/4″ diameter PVC (20mm) - 6 feet (180 cm)
* ordinary insulated copper wire for carrying altenate current (AC) - 11 feet (3.40 meter)
* Cable ties
Tools
* Soldering iron
* Glue gun
* Somthing to make a hole on PVC pipe
Wire Slim Jim Building Steps
* First take the PVC pile and measure it according to the 3/4 wavelength formula above (144.88 cm).
* Make two holes at the opposite side of the pipe. This hole is used for putting the copper wire through the pipe. Repeat this step 144.88 cm away from the top hole. Both of these holes will hold the copper wire.
* Insert the wire through the hole until both end reaches each other on one side of the PVC pipe. Then measure the length of the wire and cut the wire on that side so the setup resembles the figure above.
* Cut the wire insulation (but leave the wire uncut) 1/20 wavelength away (9.6 cm) from the bottom of the PVC pipe, again refer the figure above.
* Solder the center of the coax cable at the longest side of the slim jim (3/4 wavelength part) and the braid/shield at the shorted part of the antenna.
* Test the antenna using SWR meter to ensure that its SWR is at minimum or within acceptable level.
* There you go, you’ve build yourself your own 2 meter Omnidirectional Slim Jim antenna for less than USD2 (RM 6.00)
Slim Jim (J Integrated Match J-Pole) is probably the most easiest and powerful 2 meter antenna to build provided you have the exact measurement and material to build it.
This how to will show you how to build a 2 meter slim jim antenna from ordinary insulated copper wire commonly used for carrying AC (alternate current) electricity in your household.
Slim Jim construction basic
I am not only going show you the measurement of slim jim antenna for specific frequency, but I’m going to show you how to calculate slim jim antenna by your own using the basic formula below.
Basic Slim Jim Idea
The figure above shows that the longest side of slim jim is 3/4 wavelength long and the shorter side of the slim jim consist of 1/2 wavelength and 1/4 wavelength long seperated by a gap.
The feedline (coax cable) is normally connected 1/20 wavelength from the bottom of the slim jim antenna with the center conductor connected to the longest side and the shield/braid is connected to the shorter side.
Building the Slim Jim antenna
This guide assume you want to build a slim jim antenna that centered on 146MHz.
Calculation
The formula for calculating wavelength in metric system is 300/(freq MHz)
Using the formula from the figure, we have :
300/146 = 2.055 M
Wavelength = 205.5 cm
Wavelength x copper wire velocity factor = 205.5 cm x 0.94
= 193.17 cm
3/4 wavelength = 193.17 x 0.75
= 144.88 cm (57″)
1/2 wavelength = 193.17 x 0.5
= 96.585 cm (38″)
1/4 wavelength minus gap = 193.17 x 0.25 - 2.6 cm
= 45.69 cm (18″)
Coax tap = 193.17 x 1/20
= 9.6 cm (3 3/4″)
Building Materials
* 3/4″ diameter PVC (20mm) - 6 feet (180 cm)
* ordinary insulated copper wire for carrying altenate current (AC) - 11 feet (3.40 meter)
* Cable ties
Tools
* Soldering iron
* Glue gun
* Somthing to make a hole on PVC pipe
Wire Slim Jim Building Steps
* First take the PVC pile and measure it according to the 3/4 wavelength formula above (144.88 cm).
* Make two holes at the opposite side of the pipe. This hole is used for putting the copper wire through the pipe. Repeat this step 144.88 cm away from the top hole. Both of these holes will hold the copper wire.
* Insert the wire through the hole until both end reaches each other on one side of the PVC pipe. Then measure the length of the wire and cut the wire on that side so the setup resembles the figure above.
* Cut the wire insulation (but leave the wire uncut) 1/20 wavelength away (9.6 cm) from the bottom of the PVC pipe, again refer the figure above.
* Solder the center of the coax cable at the longest side of the slim jim (3/4 wavelength part) and the braid/shield at the shorted part of the antenna.
* Test the antenna using SWR meter to ensure that its SWR is at minimum or within acceptable level.
* There you go, you’ve build yourself your own 2 meter Omnidirectional Slim Jim antenna for less than USD2 (RM 6.00)
The Homebrew Slim Jim Antenna Gain
The Homebrew Slim Jim Antenna Gain
I’ve been searching for information regarding the radiation angle and the gain of slim jim antenna, but found none of it. So I decided to build the model of the antenna inside the ever useful MMANA-GAL software to get the information I needed myself.
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 :
Copy from :Slim Jim 9w2wtf
My Homebrew 2 meter VHF Antennas
Ham Radio, Photos and Travels April 7th, 2008
Here are the photos of my homebrew 2 meter VHF antennas. One is 6 element OWA yagi and another is a 2 meter Slim Jim for omnidirectional operation
OWA Yagi 6 element
Slim Jim antenna
OWA Yagi 6 element
The homebrew slim jim antenna was previously featured on my blog as well as its plan. The OWA Yagi 6 element antenna plan can be obtained from this post : 6 Element OWA Yagi Antenna for 2 Meter band plan
I’ve been searching for information regarding the radiation angle and the gain of slim jim antenna, but found none of it. So I decided to build the model of the antenna inside the ever useful MMANA-GAL software to get the information I needed myself.
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 :
Copy from :Slim Jim 9w2wtf
My Homebrew 2 meter VHF Antennas
Ham Radio, Photos and Travels April 7th, 2008
Here are the photos of my homebrew 2 meter VHF antennas. One is 6 element OWA yagi and another is a 2 meter Slim Jim for omnidirectional operation
OWA Yagi 6 element
Slim Jim antenna
OWA Yagi 6 element
The homebrew slim jim antenna was previously featured on my blog as well as its plan. The OWA Yagi 6 element antenna plan can be obtained from this post : 6 Element OWA Yagi Antenna for 2 Meter band plan
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