FEATURE AZBox ME Receiver Software Revealing the Secrets of the AZBox ME Super Box Part 1: Blindscan automatically looks for all active transponders also detects channels with very low symbol rate makes full use of the AZBox ME tuner s capabilities finds all active channels blind scan mode currently in beta mode 100 TELE-satellite International The World s Largest Digital TV Trade Magazine 04-05/2012 www.tele-satellite.com www.tele-satellite.com 04-05/2012 TELE-satellite International The World s Largest Digital TV Trade Magazine 101
FEATURE AZBox ME Receiver Software Blindscan for the AZBox ME Vitor Martins Augusto In TELE-satellite 02-03/2012 we introduced the new Opensat super box by the name of AZBox ME. At the time we were not able to test the blind scan function, as it was not yet implemented. Opensat has meanwhile released a new version of the receiver s firmware which features a beta version of the blind scan mode. The updated software was launched much quicker than we expected and thus proves once again Opensat s commitment and customer dedication. It is the feed hunters among us who will appreciate more than anybody else that Opensat always keeps its promises and does not leave us in the dark as far as new features are concerned. Naturally, we turned on our AZBox ME right away to have an in-depth look at how Opensat delivers blind scan functionality. The new firmware image needs to be flashed before the amended software is available. Since the AZBox ME comes with a large flash chip that allows parallel installation of up to three different firmware versions, we decided to install the new v1.6 firmware in memory bank no. 2. For the sceptics among you we are happy to reveal that the flash procedure does not require a degree in engineering: You simply reboot the receiver and as soon as the boot menu is displayed on the VFD display you press the VOL+ button to get the boot loader into flash mode. Next, the receiver s IP address appears on the VFD display and has to be entered in a web browser. We used Mozilla Firefox, which works best with the web functions of the recceiver. If you prefer Chrome or the Internet explorer, they can be used just as well in this case. The web browser then displays a website that is generated by the receiver. Here, you first have to decide which of the three available memory banks you want to use for the new firmware. In addition, you may access the MICOM Upgrade menu to update the front processor as well. Please bear in mind, though, that this should only be done when absolutely necessary. Never use a wrong file out of the blue, as this may result in the remote control not working any longer and the VFD staying dark. The Device Info menu item calls up various receiver parameters and Reboot! will restart the box. As mentioned before, we had decided to install the new version in memory bank 2, so we selected 1 1. Browser showing the FlashMeTM Interface. The user can select between three memory-banks for parallel firmware installations. 102 TELE-satellite International The World s Largest Digital TV Trade Magazine 04-05/2012 www.tele-satellite.com
2 3 4 2. On the first step, the user must upload the desired firmware image. 3. After the upload, the receiver can be configured to automatically reboot after the flashing process. This is usually a good idea. 4. Existing channel and satellite settings can easily be backed up and restored, by just using any FTP client. Navigate to /etc/ tuxbox and copy the existing files. Firmware Upgrade (BOOT 2). In actual fact, it does not make a difference at all which position you choose the result always stays the same. All you need to know in the boot loader menu is which number (0, 1 or 2) corresponds to which image. On the next page you can select the required firmware by pressing the Browse button. Once the right file is chosen a click on the Upload! button initiates the file transfer from the PC to the receiver. This process only takes a few seconds and after it is completed the next page appears on the screen. On this third page you can determine whether or not the receiver should re-boot automatically after the new firmware has been flashed. We recommend activating this function because it means you can leave the box unattended during the entire upgrade process. Once the new firmware is installed the receiver will boot all on its own with the new software. Simply press the Flash! button and let the magic begin. You should avoid by all means to interrupt this process or, even worse, unplug the receiver. But then again, this would not really cause any major damage since the boot loader will be unaffected and the worst that could happen is that you have to restart the flash process for the memory bank in question. What s more, even with a failed flash process there are still two other intact firmware images in the memory that can be used to boot the receiver. And if the worst case occurs and you manage to screw up both the firmware and boot loader the AZBox ME boasts a kind of panic button on the back panel which activates an emergency image to allow a new flash process. So now that the new v1.6 firmware was in place we called up the installation wizard to adjust the software according to our requirements. Instead of initiating a channel search we decided to use the settings list we had saved previously, because we wanted to get a first impression of the revised firmware straight away. It always pays off to have copies of one s current settings on the PC as it saves valuable time in cases like that. A number of settings editors for Linux receivers are available from the Internet, but in actual fact all you have to do is copy a directory with the help of an FTP client. The settings can be found in the /etc/tuxbox directory and you may use any standard FTP application such as Filezilla, for example, to create backups of your existing settings and to restore those backup copies onto the receiver again. The only thing you need to know is your receiver s IP address to access its file directory. Key in root as user name and leave the password field empty by default. If your receiver can be accessed via the Internet you should, however, change the default setting and set a password to protect unauthorised access. With MS Windows press the Windows key plus R and key in telnet 192.168.1.100 (make sure 104 TELE-satellite International The World s Largest Digital TV Trade Magazine 04-05/2012 www.tele-satellite.com
5 6 7 8 5. The new blind scan functionality is seamlessly integrated in the service scan menu. 6. Initialisation of the tuner. 7. Pass 1: The tuner searches for active frequencies. 8. Pass 2: All found frequencies are analysed to determine the correct Symbol Rate and to obtain other transponders broadcasted in the NIT. Tabel 1 you use your receiver s actual address!). Use root without a password to log in and once you re in the Linux shell type in the command passwd. Then you set the password and key it in a second time to make sure it is correct. From now on that password is required for logging in as root user. Now the time has finally come for checking out the new blind scan functions. All features are seamlessly incorporated in the firmware and can be found in the signal search menu right where we would have expected them. With the new firmware the Blind Scan option is added to the existing Multisat, Single Transponder and Single Satellite modes. Blind scan with the AZBox ME is a three-step affair: First, the tuner scans the entire frequency band for transponders. Next, reception parameters are determined for each found frequency. In case Network Scan is active all associated transponder data are extracted from the NIT stream. The third step comprises the actual blind scan, which means the individual transponders are scanned for channels. In our test we were looking for answers to the following questions: How many channels are found using blind scan as opposed to the pre-defined transponder list? How fast is blind scan? Are channels with low symbol rates also found using blind scan? Are the data of transponders found with blind scan stored in the transponder list so that those transponders will also be found using regular search modes? To find those answers we started out with deleting all channels transmitted from HISPASAT 30.0W and initiated a standard transpon- der search ( Single Satellite mode) with active network scan. In general, providers take advantage of their transponders to transmit information on other transponders they also use, so that users can be sure their receivers find all channels of individual providers, no matter over how many transponders they are spread. More often than not, pre-defined transponder lists are not fully up-to-date and therefore it makes sense to always use the benefits of network mode to make sure your receiver can find all available channels. The search on HIS- PASAT 30.0W took some 24 minutes and yielded a total of 548 channels. We then proceeded with performing the same search on the same satellite using the newly added blind scan function. Once again, we made sure Network Scan was turned on. This time the search only lasted 18 minutes and resulted in 613 identified channels. Needless to say, we were rather impressed with the capabilities of the AZBox ME s blind scan mode. We gave the channel list a quick look and stumbled across three channels that might be of particular interest to satellite DXers. (table 1) Many tuners struggle with symbol rates of around 2000 Kbit/s and if that happens these channels are either not found at all in a search or not demodulated correctly. We were all the more surprised to find out that the AZBox ME seems to be in a league of its own as far as low symbol rates are concerned. Excited by those promising first results we hooked our 1m offset antenna to the AZBox and aligned it towards TEL- STAR 12 (15.0W). This is a position that is not widely known and used in Central Europe as it only transmits few FTA channels. Transponder 10 at 12608H seems to be the most obvious choice it is used by Globecomm to broadcast BBC Persian, among others. To be frank, there is another reason we chose TELSTAR 12 for a blind scan search: It 106 TELE-satellite International The World s Largest Digital TV Trade Magazine 04-05/2012 www.tele-satellite.com
9 10 11 15 9. Thanks to the NIT, the transponder search is speeded up a lot. 10. Pass 3: On the last stage, all listed transponders are scanned for valid channels. 11. Blind scan of Hispasat 30.0W. 12. Pass 1: Frequency scan. 13. Pass 2: Transponder analysis. 14. Pass 3: Channel scan for each of the 55 transponders. 15. Ribamontana TV: FTA channel with particularly low Symbol Rate 16. The AZBox offers detailed information of the active channel. 17. Visualization of the different PIDS used by the current channel. This is important for channel- and feed-hunters: they 13 12 14 is the position of choice for a number of regular feeds which come with totally outof-the-ordinary symbol rates. To make matters worse, those rates usually are also very low and hardly exceed the 2000 to 5000 Kbit/s bracket. To make sure the AZBox ME s new firmware does not rely on dirty tricks or use any shortcuts we performed a blind scan with the HISPASAT satellite configuration still in place. In such a case a regular transponder search would hardly bring a result since transponders on different satellites generally have different frequencies and deviating reception parameters. One of the found channels was TUNIS TV with a symbol rate of 2893 Kbit/s, which goes to show yet again how capable the tuner of the AZBox ME really is. It should definitely be able to meet even the exacting demands of feed hunters and satellite DXers. As our in-depth test progressed we moved the antenna 108 TELE-satellite International The World s Largest Digital TV Trade Magazine 04-05/2012 www.tele-satellite.com 16 17 can compare these PIDs with the ones specified on popular satellite websites to make sure they did indeed find a new channel and not just an existing channel with a different name. 18. Service Info of Ribamontana: the Symbol Rate is specified in Bit/s instead of the usual Kbit/s! Clearly a very low SR, showing the excellent capabilities of the tuner. 19. Tunisia 1 on TELSTAR 15.0W. Also a channel with low Symbol Rate. Most receivers are not able to receive such channels. 20. Verification of TELSTAR 15.0W with our spectrum analyzer. We compared the number of found transponders with the number of spikes seen on the spectrum (only one image shown, but of course we used all four bands: V-L, H-L, V-H and H-H). The blind scan did not miss any transponder! 18 further west until we reached INTELSAT 905 (24.5W). Apart from NTA International and RTI 1 there are no FTA channels transmitted in the Ku band from that position. There are, however, numerous transponders dedicated to feeds only, which prompted us to perform another blind scan. This time, many transponders were found again in steps 1 and 2 of the blind scan process, while not a single result was achieved in step 3, when the actual channels should be scanned. To obtain a second opinion we attached our reference meter (Spaun Sparos 609) to the antenna output of the AZBox ME and looked at the spectrum analyser to find out what was going on. It turned out that the beta version of the blind scan mode has a bug which can prevent the receiver from switching from high band to low band (0 khz signal instead of 22 khz signal) in the final step of a blind scan. What happens then is that transponders found in the low band are later scanned in the high band, which of course yields no results. When we examined the satellites.xml file, which Linux receivers generally use to save their transponder list, we 19 found that details of transponders found using blind scan unfortunately are not added to the general transponder list. Opensat s software engineers are currently addressing that issue and will offer a fix shortly. While the new blind scan mode still leaves some room for improvement, feed hunters may nonetheless use it at this stage to write down the frequencies of all detected transponders and then perform manual scans using that data. In addition, we have nothing but praise for Opensat s speedy firmware development which keeps adding great fea- 20 tures to a receiver that never ceases to amaze us. We re all looking forward to the final release version of the blind scan feature, yet even now the AZBox ME is a fascinating box al- ready. It s hard to believe such a small and inexpensive satellite receiver can offer so many useful functions. You can be sure this isn t the last time you read about that super box. www.tele-satellite.com 04-05/2012 TELE-satellite International The World s Largest Digital TV Trade Magazine 109