EEE PC 901 + 3G modem, part two. Making the right antenna
In the last article, I talked about how to install a modem inside the 901th heryk , including how to make an antenna out of scrap materials and promised to do everything as it should and write about it. So, I keep my promise - several photos with a description are waiting for you under the screen.
In order not to reinvent the wheel and not to produce entities, it was decided to use the native antenna from the modem, slightly modifying it.
1. Remove the contact that connected the antenna to the modem card.
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2. Carefully peel off the film from the plastic cap, trying not to tear the foil tracks.
3. Cut off the excess film and solder the contact of the antenna with solder.
4. We cut out a rectangular parallelepiped from any soft material (I used several layers of foam double-sided tape) and carefully glue the antenna on it in about the same way as it was glued on a plastic cap.
5. Wrap the resulting antenna in electrical tape so that only the solder-covered contact is left outside.
6. Place the finished antenna in the upper corner of the laptop lid. Now the antenna has become noticeably smaller than it was originally, and it ideally enters between the screw fastener and the Wi-Fi antenna. Next you need to attach to the foil on the lid of the laptop contact, to which then you will need to solder the antenna wire braid. I could not solder anything to the foil, and for fixing the contact (a piece of braid from the antenna wire, soldered on one side and uncovered on the other), I used a soft fabric sticker from the top of the cover. After that, we solder the antenna wire - the central core to the antenna, the braid to the contact on the cover, and the central core from the other end of the wire to the antenna's contact pad on the modem.
As an antenna wire, I used the wire from the Wi-Fi antenna of a broken laptop, I advise you to do the same - compared to the previous my homemade wire, the level and signal quality increased significantly:
it was - RSSI about -75 dBm, signal level ~ 70%;
It became - RSSI about -65 dBm, signal level ~ 80%.
Also, pages in the zone of weak signal reception began to load quite well, whereas earlier with a weak signal the connection was not established from the first time and the pages were also loaded only after several attempts.
Plus, the new wire is more resistant to repeated bends when opening or closing the laptop lid.
PS Ready device was tested in field conditions outside the city - the flight is normal, the Internet works.
In order not to reinvent the wheel and not to produce entities, it was decided to use the native antenna from the modem, slightly modifying it.
1. Remove the contact that connected the antenna to the modem card.
')
2. Carefully peel off the film from the plastic cap, trying not to tear the foil tracks.
3. Cut off the excess film and solder the contact of the antenna with solder.
4. We cut out a rectangular parallelepiped from any soft material (I used several layers of foam double-sided tape) and carefully glue the antenna on it in about the same way as it was glued on a plastic cap.
5. Wrap the resulting antenna in electrical tape so that only the solder-covered contact is left outside.
6. Place the finished antenna in the upper corner of the laptop lid. Now the antenna has become noticeably smaller than it was originally, and it ideally enters between the screw fastener and the Wi-Fi antenna. Next you need to attach to the foil on the lid of the laptop contact, to which then you will need to solder the antenna wire braid. I could not solder anything to the foil, and for fixing the contact (a piece of braid from the antenna wire, soldered on one side and uncovered on the other), I used a soft fabric sticker from the top of the cover. After that, we solder the antenna wire - the central core to the antenna, the braid to the contact on the cover, and the central core from the other end of the wire to the antenna's contact pad on the modem.
As an antenna wire, I used the wire from the Wi-Fi antenna of a broken laptop, I advise you to do the same - compared to the previous my homemade wire, the level and signal quality increased significantly:
it was - RSSI about -75 dBm, signal level ~ 70%;
It became - RSSI about -65 dBm, signal level ~ 80%.
Also, pages in the zone of weak signal reception began to load quite well, whereas earlier with a weak signal the connection was not established from the first time and the pages were also loaded only after several attempts.
Plus, the new wire is more resistant to repeated bends when opening or closing the laptop lid.
PS Ready device was tested in field conditions outside the city - the flight is normal, the Internet works.
Source: https://habr.com/ru/post/120922/
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