Category: General

Helmar has blogged about how evil and crap and shit stuffit expander is and I would just like to second his opinion.
Hear Hear Helmar. I’m with you brother!

Mark has gotten himself a blog.

I was fiddling around wondering how on earth I was going to build myself a notch filter to filter out or reduce the signal strength on ABC when I discovered something miraculous. If I unplug the antenna from the DVB cards, just leaving the patch lead, and plug in the attenuator I bought from Jaycar, I get perfect reception on all the channels. Thank god. No more fiddling around. I have set Mythtv to record just about everything under the sun now. I doubt I’ll watch even 1/4 of it, but that’s not the point!
I just have to work out how to get the remote working now and it will be all set.

So we finaly decided to go the Mythtv route. I bought an AMD Sempron based computer to use as the server and the front end. I used very standard components which I researched to ensure they would all work with linux, and after a few teething troubles due to a stupid supplier who couldn’t even be bothered to test the machine before despatching it to me even though I specificaly requested it, it’s up and running and so far has been solid as a rock. I also bought two Twinhan Vision Plus DVB-T tuner cards for a very reasonable $77 each delivered.
I installed Debian on the machine which turned out to be a remarkably painless process. I have been a long time fan of debian and every time I install it, it just gets better and better. Then I set up LVM so when I get a new hdd I’ll be able to add it easily. Then I found the .debs of mythtv and installed them. It pretty much worked out of the box. There was quite a bit of fiddling around to configure it all, but basicaly it worked. Reception was great on all the channels except ABC and ABC2. On those channels it was breaking up quite a lot. According to Brendan, the technical term is those channels were off the cliff.
On our TV (analogue reception) we have trouble with 2 channels. SBS and ABC. SBS is quite snowy and grainy, like the signal is too weak, but the reception is fine through the Visionplus cards. ABC is usually quite distorted, and slightly shadowy, the distortion is particulary bad when there is a lot of bright objects on the screen, and at those times the distortion often spreads into the audio.
My first thought was that maybe were not getting enough signal into the cards. I do have to split the signal three times (one for the telly, and once each for the Visionplus cards) but even trying one of the cards connected directly didn’t solve the problem. I bought a tv signal amp, plugged it in and hoped for the best. I held my breath, and tuned to ABC on the mythbox. It was just the same or possibly worse. I tried adjusting the gain of the thing, but it only made it worse. Back the the drawring board.
I had a look at the output from tzap, a command line utility for tuning the cards. I was getting slightly lower signal to noise ratio on ABC than on the other channels. This led me to believe it might be some sort of noise in the system causing the problem. So I decided to build a 1/4 dipole antenna specificaly tunned to the ABC frequency in the hopes of just getting that signal into the card and seeing if that gives me good reception. It turns out that a quater wave of the ABC frequency is 33cms, so I just built it using a bit of cardboard and some wire and a little PAL plug in the cardboard. I might put a picture up of it later. I plugged it in, tuned to ABC and… nothing… well… something, broken up signal, worse than when I was using the normal antenna. Back the the drawring board.
After researching this problem, I started to think it might be caused by the signal being too strong. We do live fairly close to the ABC Transmitter in Gore Hill, and my futher reading (pdf) also lead me to believe this was the case. That document suggests a notch filter to solve that problem, but before spending big on notch filters, I wanted to be sure that was the problem. So I went to Jaycar to buy a variable attenuator that they sell. As I work in Alexandria, I went to the Alexandria branch. I walked in, found the product, went to the counter to pay and the sales assistant says “Oh… you must live near Gore Hill” which of course I do. He goes on to say “No one who lives around here buys those but we sell loads in the Gore Hill branch because its so close to the ABC transmitter”. Anyway, I took it home, plugged it in and hey presto! Almost perfect reception on ABC.
But now I have a new problem, in order to get good reception on ABC I have to turn the attenuation up so high that the other channels start to break up. So back to the notch filter. The trick is, where do I get one and how do I configure it correctly for the frequency I’m after? I did notice that there is a product that Hills sell that might do the trick, but it looks very expensive. I also heard there is a place called Electrocraft that specialise in antenna equipment. I’ll give them a call and see what they have.

While researching chocolate, I came across a few articles about the health benefits of chocolate. It turns out that it may lower blood pressure, and it might also be good at stopping persistant coughs.

I found I often want to search for text in emails. I found this nice little plugin called conquery that lets you do many things among which is search google for the selected text. Works beautifuly.

First episode of the blues story. Enjoy

I have created a wishlist of books I want on Amazon. Not that I want them from Amazon, just that its a good way of making a list of books that I want. I mainly did this so my fans have a way of buying me something if they feel so inclinded. No, actually I did it in the hope that one day I’ll actually get around to buying and reading those books.

Well, here I am at the end of a long weekend, the Anzac long weekend to be more accurate. we did a number of things this weekend. Probably the highlight was seeing The Cat Empire. I had heard of them before and Maissa saw them at Womad a few years ago and had been raving about them, but I have to say, they were pretty good, one of the best bands I have seen on stage in quite a while. The energy they put into the performance was quite astounding. How would I describe them? Well, I would say they are a mix of Latin, Jazz, Hip Hop, Funk, Reggae and Ska (not necessarily in that order).
Then we went to the Inaugural Balmain Acoustic Music Festival, and I have to say that was rather nice too. Very pleasant park, not too crowded, nice atmosphere and great music. We saw among others, Big Wheel, The Back Sliders, Monsieur Camembert and Kristina Olsen.
We also dropped by Damian’s place to see his new lack of wall.
Dropped by Mark and Yukiko’s to see the new addition to their family. She is very cute. She even has a blue bum! amazing. They looked pretty good. Quite relaxed I thought, although I think they weren’t so relaxed just after she was born.
Anyway, that’s about it for this post which was inspired by Brendan’s blog. Thanks Brendan. And because Brendan had a pretty graph on his site, I’m going to put one up too. You can’t get much purer than a sine wave, so without further ado…