Sunday, August 30, 2020

Remove the cylinder from a screen door lock

Locking Handle
for Screen Door
There are many videos showing how to remove the cylinder 
from a
European Profile Cylinder
Locking Handle for a Screen Door,  However, I found the the cam would not turn upwards on my European Profile Cylinder. There are suggestions to use a paperclip, blade or other thin implement.

self-retracting tape measure
But I did not have anything thin enough, so I cut a 100mm length off a small metal self-retracting tape measure and then cut that in half longitudinally. The result is a thin strip of metal 100mm x 5 mm, which has a curve matching the lock cylinder. I was able to slip between the cylinder and lock, then lever the cam up. Be careful as the metal strip was sharp where it was cut.

Having got the cylinder out, my next problem was that rather than being screwed to the door it was riveted. I used a Dremel type Rotary Tool with a miniature grinding disk to remove the heads of the rivets.

Saturday, August 15, 2020

Optus Wireless Broadband

Huawei E5577
My Telstra wireless broadband has been working adequately during the months working from home due to COVID-19. But just in case this week I purchased an Optus branded 4G Wi-Fi Modem Huawei E5577. This was on special at Australia Post for $10, with a 4GB prepaid SIM (at Officeworks they are $99 with 50 GB). Similar units branded Telstra are also sold. The package had an expiry date which had passed, but the modem and SIM worked fine. 

Huawei E8372
The process of registering the SIM was straightforward and the device was working within a few minutes. The  Huawei E5577 includes a power button, small color screen and a battery, unlike the cheaper Huawei E8372. This makes the E5577 more suitable for use with a tablet computer you carry around. The modem could be left in a bag and communicate with the tablet by WiFi. However, it is less suitable for use with a laptop, as it can't be plugged directly into a USB socket (you need to use the short cable supplied), you have to turn it on and it does not work without a battery. The E8372 has a USB plug built in and simply starts up when power is applied.

The Google Internet speed test reported 18.4 Mbps download, 18.4 Mbps upload and Latency of 24 ms for Sydney which is more than I need. However, in Canberra it recorded only 0.53 Mbps download and 0.35 Mbps upload with 75 ms latency. This compared with 3.35 Mbps download, 0.78 Mbps upload and Latency of 45 ms for the Huawei E8372 using the Telstra mobile network. The Optus service was not enough for video conferencing in Canberra, even with the efficient Zoom product, whereas Telstra worked fine.

Overall I find the Huawei E5577 less suitable for my needs than the E8372, and the Optus service less useful than Telstra. The Optus service, as I experienced it, is not suitable for a student (or teacher) who needs Internet access.