DISCLAIMER: I have no association with UVB-76 station, neither do I have any clue what is the content I am relaying. I can only assure, that the signal is received on 4.625MHz AM-modulated 900km NW from supposed origin and retransmitted unaltered. In no way can I guarantee this service, nor be considered responsible of any content re-transmitted. The only purpose for this relay to exist is because lot of people who do not have equipment or are located too far from station seem to be interested about listening to it. Should the UVB-76 station- or transmission content owners feel violated in any way, please contact me at uvb76.repeater@gmail.com and we will work it out.

Note, that because of shortwave radio signal propagation specifics the station can be more or less reliably received from around 4pm to 6am GMT on summertime. It is almost 24h audible during the winter, with short "skip-zone" blank-out around 6pm GMT.

The USB feed is considered as main source of audio today, as the voice messages are much better audible there than on the AM stream. However, the buzzer sound from the AM stream is somewhat more pleasant to listen at, so both feeds are kept simultaneously.

Friday, November 26, 2010

Giftshop is Now Open!

As of the result of random conversation on IRC "I wan to buy something UVB-76 labeled for Christmas!", uvb-76.net now has a Giftshop! :)) Please check the link on top of the blog page!

Sunday, November 21, 2010

Archive Engine and 24h Waterfall Now Works!

Finally, after almost a month, the archiving system is working as it's supposed to! Blessed be anybody who have anything to do with developing CURL, especially G√ľnter Knauf for maintaining it for Win32!
Thanx to that, the latest archive on the list is actually almost real-time snapshot, lagging less than a minute behind the actual stream, as its getting updated every 30 seconds.

Other improvement is the WinradHD 24h waterfall capture: it is now uploaded every 15 minutes, so if you want to check if the buzzer has been active, just look at the waterfall and you will see how it looks from the streamer perspective!

Both buttons are at the top of the screen, just below the UVB-76 banner, if you haven't noticed yet! :)

Monday, November 8, 2010

Why had the buzzer go to maintenance .. ?

As some of you may have already noticed, there are some archives published at the page what you get when pressing the 'test' tab on top of this page.
The reason I havent announced it yet is, that having just 200Mb audio files downloadable is sort of semi-useful solution, so I have been wrestling around to get them visualized somehow and link that to online player of a sort.
If one thinks the utilities for performing FFT (fast fourier transformation) analysis on 1Gb+ audio files (as some of the UVB-76 Repeater archives are) are readily available from the internet, one has to reconsider .. and write such utilities from scratch! :)

And so I did. Only to realize, 10 minutes ago, that I should have had done something like that already ages ago!
The first decent output generated by my new tool (call it a MP3toJPG or whatever :)) was so revealing, that I thought I will share it!

The picture below is a spectral analysis of the archive from August 28, 2010 and displays about 80 hours worth of audio (MP3 file size was 850Mb):

(Click on image to view/download)

The timeline goes from left to right and the frequency goes from bottom to top, i.e. lower frequency is at the bottom of the image and higher frequency (4000Hz) is at the top. The file is over 7000 pixels wide, so beware! :)

The bright markers are where the UVB-76 buzzer is transmitting, although you will se about every 10'th or so buzz there (the total "length" of this picture is 80 hours, remember).

However, what you clearly see is that the buzzer what is supposed to be transmitting more or less consistent signal, is drifting up and down in frequency as it pleases!
Its not the analysis software, as you can see sometimes a morse signal kicking in and having no deviation whatsoever.

Two possibilities - either the buzzer was meant to move around like that because of the desired functionality of the signal, or the equipment neded some serious maintenance. Considering that the signal disappeared shortly after for several weeks, I would assume the latter ...

Monday, November 1, 2010

IRC Channel Change

There has been a lack of operators for some time now at the #UVB76 channel, mainly for the reason that channel owner (not me) has completely disappeared form the scene two months ago. While I sincerely hope everything is well with him, the IRC client links are now pointing to the new channel #UVB-76, so please update your records if you are using other IRC clients than Mibbit.

I have also promoted few regular users to AOP status, so hopefully they are able to regain control quickly if things get out of hands!