15. 3. 2014

Astrophoto-experiment: the Moon

I performed my first astro-photo experiment from the comfort of my flat. The moon was in a good constelation with my balcony so I basically needed only to open the window.

I used quite old 60 mm refracting telescope Konustart 700:


The detector was my old DLSR Canon 350D with a T-mount from teleskop.austria.at .


I controlled the shutter remotely with B.I.G MC-C1:


All put together and aimed on the moon:


I set manual mode, IOSO 400 and shutter speed around 1/160 s. And this is my best shot - processed in iPhoto only, 1 average.



I think it is quite far from good. I think the problem was a heat conduction between the outside world and my room. This can cause blur and geometry distortion. Also I still have problems with focusing. It is not so easy even with the bright object like the moon.

Jailbreaking and unlocking iPhone 3GS

On Monday I have bought the iPhone 3GS. According to the offer it should be unlocked. According to the pretty girl, that was selling me the phone, too. Well accoding to the iPhone itself - not that quite.

I tried two SIM cards before buying it but the activation failed and even not-inserted SIM card was not recognized. Because I had no experience I thought it needs to be connected to the iTunes and some updates or restore should be performed prior to activation. So I have bought it and took home.

I did the update in the evening and still the same. My SIM card was not active. I got No service all the time. The girls had perhaps jailbreak on her phone even without knowing it. She just didn't know anything. And that was the problem.

So next whole day - literally whole day - I was trying to jailbreak and unlock the iPhone 3GS. In order to see if other iOS can be installed and find out what actually the problem is. The motivation was to activate the iPhone without the SIM card.

After several hours of googling and trying some IPSW with redsn0w, I found a way how to get running iOS 4.3.3 and unlock the iPhone for any carrier.

According to software Tiny Umbrella I could install only several versions of iOS 4 and iOS 5.0.1. Apparently there were some SHSH blobs for those systems in the phone or the software found some matches online. I am not quite sure how does this all work. You should check this before doing some downgrades definitely.

This forum discussion helped me the most, mainly this entry by dbleug22990:

1.Use redsn0w to restore the iPhone to ios 4.1(ios 4.1 doesn't require backed up shsh blobs)
2.Use redsn0w to jailbreak the iphone, check the box to downgrade ipad baseband.
3.Use redsn0w to upgrade to most current firmware( this will install a new baseband and alow your phone to activate with supported sim)

So here are the most important steps I did:

I have downloaded redsn0w 0.9.15 beta 3 for Windows. You can download iOS IPSW for example here: http://ipswdownloader.com .

I. So the next step was to restore iOS 4.1 using redsn0w. You have to navigate in Extras -> Even more -> Restore.

II. Then perform jailbreak with Cydia and downgrade iPad baseband. The modem firmware version I had was 06.15.00. You can find the version in Settings -> General -> About in the iOS.

III. The modem firmware was 05.13.04 if I am right. I did a "mistake" and made the update to iOS 6.1.6 using iTunes. Then I realized for sure that this iPhone is locked because it could not be activated with my SIM. So I restored the iPhone again to iOS 4.1. At that point the modem firmware was altered.

IV. I installed ultrasn0w 1.2.8 and voilà - the SIM card was recognized and I had the GSM signal!

V. Then I wanted to upgrade the iOS to version 5. iOS 5.0.1 worked but there was some problems with turning my network on and off every minute. So finally I made restore to iOS 4.3.3 which is quite stable now. Of course after every jailbreak I had to install ultrasn0w.



Notes:


A - There is some problem with the modem firmware 06.15.00 and GPS module. I realized today that it is not working properly or at all. Probably you need to downgrade the firmware again.

B - I did not want to upgrade to iOS 6 because of personal reasons
C - Be carefull and buy only unlocked iPhone!

Some perhaps useful links:

How to Downgrade iPhone 3GS iOS 6.1 Baseband 5.16.08 to 5.13.04 for Unlocking
Read more: http://www.beijingiphonerepair.com/hack/how-to-downgrade-iphone-3gs-ios-6-1-baseband-5-16-08-to-5-13-04-for-unlocking/#ixzz2w2IE8yX0
How to Jailbreak Your iPhone 3GS Using RedSn0w (Windows) [5.1.1]
http://www.iclarified.com/entry/index.php?enid=20522


5. 3. 2014

Neuschwanstein 3D Puzz

Neviem už ani prečo, no v roku 2011 som mal pocit, že sa moja rodina nudí a tak som mojej mame a sestre na meniny kúpil 3D puzzle. Netušil som, že tento hrad patrí k tým najťažším stavebniciam. Veková skupina bola 12+ a podľa toho by sme to predsa mali dať. 
Našiel som ho v second-hande Carla vo Viedni a preto som dúfal, že nebudú chýbať žiadne diely.

Začali sme v lete, písal sa dátum 11.9.2011. Prvý stavbársky tým bol zložený z mamy, sestry, Mati a mňa. Po nejakej chvíli bolo jasné, že stavba bude asi pokračovať bez príslušníkov mojej rodiny. Asi patrím k trpezlivejším jedincom.




Po pár víkendoch sme dokázali spraviť prednú bránu a strechu. Keďže sa stavby neskôr okrem mňa nikto nechytal, odložil som ju na čas do izby. To som vtedy netušil, že ten čas bude znamenať asi 2,5 roka.


Zlom nastal 2.3.2014, keď sa k stavbe dobrovoľne pridali Anička, Veronika a Ondrej. Pár hodín ticha, občas rozhovor - to bola Saturday night puzzle party. Ideálny večer na otestovanie pozornosti, sebakontroly a nájdenie autistického ja v každom z nás.
Spravili sme niekoľko veží, stien a ďalšie malé časti. Bohužiaľ sme ich nemohli dať hneď dokopy. 3 hodiny bolo málo. Dôležité však bolo, že voľných častí ubúdalo a tým sa práce na stavbe postupne zrýchľovali.





Nasledujúce nedeľné ráno mi to nedalo a počas dňa som pokračoval tam, kde Saturday night puzzle party  skončila. Práce išli rýchlejšie, počet častí sa zmenšoval. K popoludniu to vyzeralo, že by som mohol hrad dokončiť ešte v ten deň večer. K posledným prácam sa pridala moja sestra, ktorá ma okrem iného podporila aj 4. vajíčkovými krajcami chleba. Odchod do Bratislavy som posunul asi o 4 hodiny.Hrad bol v nedeľu 2.3.2014 konečne dokončený.




Chýbal iba jeden maličký dosť nepodstatný dielik z najvyššej veže. A takto vyzerá hotový Neuschwanstein z 999. častí.
Čas stavby od začiatku do konca s prestávkami: 903 dní
Počet staviteľov: 7












4. 3. 2014

AKG K 420 earpads replacement

I couldn't find any relevant source for changing the earpads for my favorite mini headphones AKG K 420 on the web. So I decided to give a short guide how I have done it.

I have bought this non-genuine earpad replacement in Media Markt (Vienna) - PUNEX Ersatz Schaumkissen. The size (big) I estimated in the shop and it seems sufficient.


0. Motivation. For comparison - old and the replaced new one:


1. I took the old earpad off. You can see the gap around the earpad. I didn't want to dismantle it further.


2. Just with my bear hand I put a new earpad on the headphone.


3. But then it looked like this. The earpad didn't fit tightly.


4. So my trick was to use some sharp and very thin knife. I pressed carefully the edge of the earpad inside the gap all around the headphone.



And that's that. Happy listening.




3. 3. 2014

My Newton 900/114

For past 10 years I used this Newton reflector. However past 3 years not that much. That is also the reason why I am playing with the idea of selling it to someone who will use it more. It is quite good one for the beginners of amateur astronomy, ethusiasts of starry sky and other stargazers. I made some photos yesterday: