Pembuatan Antena Wajanbolic untuk Wireless
Internet
(Oleh : Bagya Soetowo – bagya217@yahoo.com)
Bahan Utama :
1. Wajan dengan diameter minimal 40cm (harga sekitar Rp. 40.000,-)
2. USB Wireless LAN (harga sekitar Rp.200.000,-)
3. Pralon 3” panjang sekitar 23 cm.
4. Tutup Pralon 3” 2 buah (harga sekitar 2 x Rp. 4.000,-)
5. Aluminium Foil secukupnya.
6. Busa/Styrofoam bekas kemasan barang elektronik secukupnya.
7. Kabel USB (harga sekitar Rp.20.000,-)
8. Kabel UTP 12m (harga sekitar Rp.3.000,-/m)
Antena Wajanbolic terdiri dari 3 bagian utama :
1. Reflektor berbentuk Parabola menggunakan Wajan
2. Bagian Sensitif antena berbentuk Tabung berisi USB WLAN
3. Kabel penghubung antena ke komputer
Prinsip kerja antena Wajanbolic seperti antena parabola lainnya, yaitu menempatkan
bagian sensitif antena pada titik fokus parabola (wajan) sehingga semua gelombang
elektromagnet yang mengenai wajan akan terkumpul dan diterima oleh bagian sensitif
tersebut. Berikut ini kita bahas satu persatu.
1. Reflektor berbentuk Parabol menggunakan Wajan
Gunakan wajan dengan diameter minimal 40cm. Ukuran wajan lebih besar makin
baik karena akan lebih banyak gelombang radio yang diterima.
Hal terpenting pada bagian ini, adalah penentuan titik fokus wajan. Untuk itu gunakan
rumus dibawah ini :
Catat posisi titik fokus tersebut. Nantinya mulut Tabung Sensitif antena harus berada
pada titik fokus tersebut.
Pasang Tutup Pralon 3” dengan mur/baut tepat ditengah wajan sebagai pemegang
Tabung bagian sensitif (lihat Gambar 1 A).
2. Tabung Sensitif Antena
Bentuk jadi Tabung sensitif dapat dilihat di Gambar 1B, berupa pipa pralon yang di
bagian dalamnya ditempatkan USB WLAN (Gambar 1C).
Sebagai Tabung dapat digunakan Pipa Pralon 3” sepanjang 23cm dan bungkus 16cm
dari panjangnya dengan Aluminium foil (Ingat ! Pipa Pralon 3” berdiameter 90cm),
Tutup salah satu ujung pipa yang terbungkus Aluminium dengan Tutup Pralon 3”.
Bagian dalam Tutup Pralon tersebut harus juga dilapisi Aluminium (Gambar 1D).
Buat lobang pada Pipa untuk menempatkan USB WLAN di dalam Pipa. Tentukan
Posisi USB WLAN 5cm dari Tutup Pralon. Jika digunakan Tabung ukuran lain, posisi
USB bisa ditentukan sebagai berikut :
Diameter Tabung D (mm) L (mm)
76 96.177
77 86.819
78 79.989
79 74.738
80 70.551
81 67.117
82 64.243
83 61.794
84 59.679
85 57.832
86 56.202
87 54.752
88 53.453
89 52.281
90 51.219
91 50.25
92 49.364
93 48.549
94 47.797
95 47.101
96 46.455
97 45.853
98 45.292
99 44.767
Pasang USB LAN di dalam Tabung dan untuk memperkuat posisinya jepit dengan
Busa/Styrofoam (Gambar 1E).
Setelah Tabung Sensitif selesai pasang ke Wajan, bila perlu gunakan lem atau sekrup
(Lihat Gambar 1F)
Gambar 1 :
Desain lebih detail dapat dilihat pada Gambar 2.
A
B
C
D
E
F
Gambar 2 :
3. Kabel Penghubung Antena ke Komputer
Setelah Wajanbolic selesai dirangkai maka siap dipasang, misalnya diatas genteng
rumah (ketinggian sekitar 9m). Namun sebelumnya perlu kita siapkan Kabel
penghubung antara antena dengan konektor USB komputer. Untuk itu gunakan kabel
USB yang biasanya disediakan pada paket USB WLAN. Potong ditengah kabel USB
tersebut dan perpanjang dengan menggunakan kabel UTP (kabel LAN). Cara
menyambung Kabel USB dengan Kabel UTP adalah sebagai berikut :
OK, lengkap sudah perangkat Wajanbolic kita. Pasang Wajanbolic, arahkan ke
Menara antena Wireless Internet Provider (tentu sebelumnya anda harus mendaftar
sebagai pengguna Provider tersebut). Install software USB WLAN dan lakukan
koneksi dengan software tersebut. Jangkauan kerja antena ini sekitar 1-2km.
Selamat mencoba, semoga bermanfaat.
Salam buat Open Source Community!
Internet
(Oleh : Bagya Soetowo – bagya217@yahoo.com)
Bahan Utama :
1. Wajan dengan diameter minimal 40cm (harga sekitar Rp. 40.000,-)
2. USB Wireless LAN (harga sekitar Rp.200.000,-)
3. Pralon 3” panjang sekitar 23 cm.
4. Tutup Pralon 3” 2 buah (harga sekitar 2 x Rp. 4.000,-)
5. Aluminium Foil secukupnya.
6. Busa/Styrofoam bekas kemasan barang elektronik secukupnya.
7. Kabel USB (harga sekitar Rp.20.000,-)
8. Kabel UTP 12m (harga sekitar Rp.3.000,-/m)
Antena Wajanbolic terdiri dari 3 bagian utama :
1. Reflektor berbentuk Parabola menggunakan Wajan
2. Bagian Sensitif antena berbentuk Tabung berisi USB WLAN
3. Kabel penghubung antena ke komputer
Prinsip kerja antena Wajanbolic seperti antena parabola lainnya, yaitu menempatkan
bagian sensitif antena pada titik fokus parabola (wajan) sehingga semua gelombang
elektromagnet yang mengenai wajan akan terkumpul dan diterima oleh bagian sensitif
tersebut. Berikut ini kita bahas satu persatu.
1. Reflektor berbentuk Parabol menggunakan Wajan
Gunakan wajan dengan diameter minimal 40cm. Ukuran wajan lebih besar makin
baik karena akan lebih banyak gelombang radio yang diterima.
Hal terpenting pada bagian ini, adalah penentuan titik fokus wajan. Untuk itu gunakan
rumus dibawah ini :
Catat posisi titik fokus tersebut. Nantinya mulut Tabung Sensitif antena harus berada
pada titik fokus tersebut.
Pasang Tutup Pralon 3” dengan mur/baut tepat ditengah wajan sebagai pemegang
Tabung bagian sensitif (lihat Gambar 1 A).
2. Tabung Sensitif Antena
Bentuk jadi Tabung sensitif dapat dilihat di Gambar 1B, berupa pipa pralon yang di
bagian dalamnya ditempatkan USB WLAN (Gambar 1C).
Sebagai Tabung dapat digunakan Pipa Pralon 3” sepanjang 23cm dan bungkus 16cm
dari panjangnya dengan Aluminium foil (Ingat ! Pipa Pralon 3” berdiameter 90cm),
Tutup salah satu ujung pipa yang terbungkus Aluminium dengan Tutup Pralon 3”.
Bagian dalam Tutup Pralon tersebut harus juga dilapisi Aluminium (Gambar 1D).
Buat lobang pada Pipa untuk menempatkan USB WLAN di dalam Pipa. Tentukan
Posisi USB WLAN 5cm dari Tutup Pralon. Jika digunakan Tabung ukuran lain, posisi
USB bisa ditentukan sebagai berikut :
Diameter Tabung D (mm) L (mm)
76 96.177
77 86.819
78 79.989
79 74.738
80 70.551
81 67.117
82 64.243
83 61.794
84 59.679
85 57.832
86 56.202
87 54.752
88 53.453
89 52.281
90 51.219
91 50.25
92 49.364
93 48.549
94 47.797
95 47.101
96 46.455
97 45.853
98 45.292
99 44.767
Pasang USB LAN di dalam Tabung dan untuk memperkuat posisinya jepit dengan
Busa/Styrofoam (Gambar 1E).
Setelah Tabung Sensitif selesai pasang ke Wajan, bila perlu gunakan lem atau sekrup
(Lihat Gambar 1F)
Gambar 1 :
Desain lebih detail dapat dilihat pada Gambar 2.
A
B
C
D
E
F
Gambar 2 :
3. Kabel Penghubung Antena ke Komputer
Setelah Wajanbolic selesai dirangkai maka siap dipasang, misalnya diatas genteng
rumah (ketinggian sekitar 9m). Namun sebelumnya perlu kita siapkan Kabel
penghubung antara antena dengan konektor USB komputer. Untuk itu gunakan kabel
USB yang biasanya disediakan pada paket USB WLAN. Potong ditengah kabel USB
tersebut dan perpanjang dengan menggunakan kabel UTP (kabel LAN). Cara
menyambung Kabel USB dengan Kabel UTP adalah sebagai berikut :
OK, lengkap sudah perangkat Wajanbolic kita. Pasang Wajanbolic, arahkan ke
Menara antena Wireless Internet Provider (tentu sebelumnya anda harus mendaftar
sebagai pengguna Provider tersebut). Install software USB WLAN dan lakukan
koneksi dengan software tersebut. Jangkauan kerja antena ini sekitar 1-2km.
Selamat mencoba, semoga bermanfaat.
Salam buat Open Source Community!
How To Boot From A USB Flash Drive
How To Boot From A USB Flash Drive
For starters this is still a new science and many people have had good luck with at least one of these methods and others have not. Note that flash drives are often also called thumb drives, keychain drives, pendrives, etc.
A FEW THINGS YOU NEED TO CONSIDER IN ADVANCE.
1. The PC has to support booting from a USB flash drive. There may be anywhere from 1-3 items to change in the BIOS to make this possible assuming your BIOS supports it. Some bios's may refer to your flash drive as a USB floppy or USB zip.
2. The USB flash drive must support booting from it in general.
3. The flash drive must contain the boot/system files.
4. The flash drive must have bootsector area. This is done with special utilities.
5. References to "A:" drive lines in the autoexec.bat and/or config.sys files you copy to the drive after you make it bootable may result in errors.
6. You "may" have to format your floppy disk first in WinXP before you create a bootdisk as XP may "not" like working later on with a disk formatted otherwise.
7. Included below is a bootable ISO of DOS 7.1 which may be used with some of these methods if you do not have a 1.44 drive.
METHODS
Method 1 - Make your flash drive bootable using Bart's mkbt util:
http://www.nu2.nu/mkbt/ | Alt: mkbt20.zip
Put a bootable floppy disk in your A: drive or create one using Windows.
Download mkbt20.zip and unpack to to new temp folder you create.
Go to the temp folder.
Extract the bootsector from the bootable floppy disk. eg Open a DOS Window and go to the directory where you extracted MKBT. Type:
mkbt -c a: bootsect.bin
The boot sectors from the bootable floppy disk have just been saved to a file in the temp folder you created.
Format the flash drive in FAT or FAT16.
Copy the bootsector to the flash drive. Open a DOS Window and go to the folder where you extracted MKBT. Type:
mkbt -x bootsect.bin Z:
"Z" represents the flash drive drive Letter. So if your flash drive has another drive letter, then change the "Z" accordingly.
Now you can [grin] "should" be able to copy the utils you need to the pen drive.
Method 2 - Try these 2 HP/Compaq USB Flash Drive Utilities. They work with many other brands of flash drives as well.
HP USB Disk Storage Format Tool Version 2.0.6
HP Drive Key Boot Utility Version 7.41
Download
Method 3 - Third Party Links
http://ucsu.colorado.edu/~shaher/Bootable_USB.html
Recall I did say it's a new science.
http://www.microsoft.com/whdc/device/storage/usb-boot.mspx
Method 4 - A Bootdisk.Com Visitor Suggested
Here is my another method for creating dos bootable USB sticks using windows format.
1. From Win98 DOS-Prompt type "SYS {USBDriveLetter}:" or "FORMAT {USBDriveLetter} /U /S". If from WinXp then from start->run command.com execute format.exe copied from win95 or win98.
OR
2. Simply by enabling copy system files in windows explorer format window. By default it is disabled for non-floppy drives. To enable it use windows enabler program from http://www.angelfire.com/falcon/speedload/Enabler.htm an whoila it works.
Method 5 - Another Bootdisk.Com Fan Suggested - Thanks Keith
First if you don't have a physical floppy drive (and don't want one) you can use the [free] "virtual floppy driver" from here:
http://chitchat.at.infoseek.co.jp/vmware/vfd.html
With that you get an A: drive and can manipulate a floppy image as if you were using real floppy. You can then use that image to make a bootable CD. It's not that user friendly but once you get how it works it does work perfectly.
Even cooler you can use a "raw write" utility like dd for windows to write the floppy image directly to your USB thumb drive. Even without that famous HP utility to do the magic this will make your USB thumb drive bootable. The 'dd' ported to Windows is located here:
http://www.chrysocome.net/dd
Another trick you can use with that dd utility involves MS VritualPC (which is free). You can create a virtual machine/virtual hard drive, set it up the way you want then use dd to "raw write" the virtual hard drive image to the thumb drive; this will make the thumb drive identical to the image, including bootable (again, no HP utilities required).
Of course, your thumb drive will effectively have the capacity the size if the image in question (your 1GB flash drive will effectively be 1.44 Megs).
BareBones Boot Floppy And ISO
DOS 7.10 | Readme
Bootdisks - PC Support - Essential Utilities Bootdisk.Com
For starters this is still a new science and many people have had good luck with at least one of these methods and others have not. Note that flash drives are often also called thumb drives, keychain drives, pendrives, etc.
A FEW THINGS YOU NEED TO CONSIDER IN ADVANCE.
1. The PC has to support booting from a USB flash drive. There may be anywhere from 1-3 items to change in the BIOS to make this possible assuming your BIOS supports it. Some bios's may refer to your flash drive as a USB floppy or USB zip.
2. The USB flash drive must support booting from it in general.
3. The flash drive must contain the boot/system files.
4. The flash drive must have bootsector area. This is done with special utilities.
5. References to "A:" drive lines in the autoexec.bat and/or config.sys files you copy to the drive after you make it bootable may result in errors.
6. You "may" have to format your floppy disk first in WinXP before you create a bootdisk as XP may "not" like working later on with a disk formatted otherwise.
7. Included below is a bootable ISO of DOS 7.1 which may be used with some of these methods if you do not have a 1.44 drive.
METHODS
Method 1 - Make your flash drive bootable using Bart's mkbt util:
http://www.nu2.nu/mkbt/ | Alt: mkbt20.zip
Put a bootable floppy disk in your A: drive or create one using Windows.
Download mkbt20.zip and unpack to to new temp folder you create.
Go to the temp folder.
Extract the bootsector from the bootable floppy disk. eg Open a DOS Window and go to the directory where you extracted MKBT. Type:
mkbt -c a: bootsect.bin
The boot sectors from the bootable floppy disk have just been saved to a file in the temp folder you created.
Format the flash drive in FAT or FAT16.
Copy the bootsector to the flash drive. Open a DOS Window and go to the folder where you extracted MKBT. Type:
mkbt -x bootsect.bin Z:
"Z" represents the flash drive drive Letter. So if your flash drive has another drive letter, then change the "Z" accordingly.
Now you can [grin] "should" be able to copy the utils you need to the pen drive.
Method 2 - Try these 2 HP/Compaq USB Flash Drive Utilities. They work with many other brands of flash drives as well.
HP USB Disk Storage Format Tool Version 2.0.6
HP Drive Key Boot Utility Version 7.41
Download
Method 3 - Third Party Links
http://ucsu.colorado.edu/~shaher/Bootable_USB.html
Recall I did say it's a new science.
http://www.microsoft.com/whdc/device/storage/usb-boot.mspx
Method 4 - A Bootdisk.Com Visitor Suggested
Here is my another method for creating dos bootable USB sticks using windows format.
1. From Win98 DOS-Prompt type "SYS {USBDriveLetter}:" or "FORMAT {USBDriveLetter} /U /S". If from WinXp then from start->run command.com execute format.exe copied from win95 or win98.
OR
2. Simply by enabling copy system files in windows explorer format window. By default it is disabled for non-floppy drives. To enable it use windows enabler program from http://www.angelfire.com/falcon/speedload/Enabler.htm an whoila it works.
Method 5 - Another Bootdisk.Com Fan Suggested - Thanks Keith
First if you don't have a physical floppy drive (and don't want one) you can use the [free] "virtual floppy driver" from here:
http://chitchat.at.infoseek.co.jp/vmware/vfd.html
With that you get an A: drive and can manipulate a floppy image as if you were using real floppy. You can then use that image to make a bootable CD. It's not that user friendly but once you get how it works it does work perfectly.
Even cooler you can use a "raw write" utility like dd for windows to write the floppy image directly to your USB thumb drive. Even without that famous HP utility to do the magic this will make your USB thumb drive bootable. The 'dd' ported to Windows is located here:
http://www.chrysocome.net/dd
Another trick you can use with that dd utility involves MS VritualPC (which is free). You can create a virtual machine/virtual hard drive, set it up the way you want then use dd to "raw write" the virtual hard drive image to the thumb drive; this will make the thumb drive identical to the image, including bootable (again, no HP utilities required).
Of course, your thumb drive will effectively have the capacity the size if the image in question (your 1GB flash drive will effectively be 1.44 Megs).
BareBones Boot Floppy And ISO
DOS 7.10 | Readme
Bootdisks - PC Support - Essential Utilities Bootdisk.Com
