Tag Archives: decoding

JJC/9VF Kyodo News Radio Fax (August 2014)

Wenlock commented on my initial post about JJC/9VF Kyodo on 25th July claiming that it appears Kyodo is now QRT. Knowing that radiofax services are dwindling, due to high cost of maintenance, problems sourcing parts for repair and mariners having … Continue reading

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Project: Read, Collect & Decode SD Card CSD Register Data

As a followup to yesterday’s post of collecting and decoding the Card Identification Register data from various SD cards, I couldn’t resist the challenge to try and decipher the Card Specific Data Register (CSD). Interestingly, I pored over datasheets for … Continue reading

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Project: Read, Collect & Decode SD Card CID Register Data

Buying flash memory from poorly reputed places, such as Chinese computer markets, and online auction sites is an often known way to collect BAD flash memory cards that fall short on performance, longevity and data security. SD cards, along with … Continue reading

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RTL-SDR: 433.92Mhz ASK/OOK Decoding of Various Devices with rtl_433

Since I got into the rtl-sdr craze, one thing I’ve always been interested in doing is decoding various sensors and remote controls which operate using RF. In order to do this, you must first acquire the signal, understand its modulation … Continue reading

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Analyzing the Efergy HM01 Air Data Format

Isn’t it funny how having the Efergy HM01 power meter sitting on my desk, looking all “sad” from not being used makes me suddenly want to make an effort to try and reverse engineer the air interface? I suppose part … Continue reading

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Random: Arrgh, my ankle! Energy Monitor Fun – tracing “vampire loads”

Another week goes by, and strangely, my ankle is still busted. As a result, life has been about being content with being bedridden most of the time and trying my best not to walk at all, in order to avoid … Continue reading

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Sharing the Data: Efergy Wireless Energy Monitor

Regular followers can already tell that I’ve been making progress in tinkering with the EfergyRPI_001 code by Nathaniel Elijah, having impressed myself with getting it working on Windows and logging data happily for days on my Chromebook. But now it’s … Continue reading

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Efergy Wireless Energy Monitor decoding now in Windows!

If it seems I’ve been a little crazy with the posts lately, you’re not mistaken. I’ve been slightly busy trying different things, and now I have some good news – you can now decode your Efergy Wireless Energy Monitor from … Continue reading

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Improving RTL-SDR Decoding of the Efergy Wireless Energy Monitor

In all of my excitement after discovering that Efergy Wireless Energy Monitors could be decoded using the data from an RTL-SDR dongle and a program written by Nathaniel Elijah, there were still several investigations I needed to conduct to determine … Continue reading

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Efergy Energy Monitor Decoding with RTL-SDR

In a very cool development, Nathaniel Elijah of RTL-SDR Projects had posted about the decoding of the Efergy E2 Classic FSK data transmissions using RTL-SDR and a Raspberry Pi. I just so happened to stumble upon his page, and knowing … Continue reading

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SDR# – My favourite SDR program for the RTL2832U dongles

When the RTL2832U “SDR surprise” was being unearthed, the software of choice was GNU Radio. While it’s a very powerful tool, it was also very cumbersome to use for the most basic of tasks, and required a lot of digital … Continue reading

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ADSB# Range Testing with the RTL2832U+R820T Tuner

I’ve covered ADSB# in one of my earlier articles, even going so far as to take my E4000 dongle to the airport for a spin. But as we now know, Elonics (the guys behind the E4000 front end) have gone … Continue reading

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BMF Taiwan Radio Fax

It’s been a while since I posted any Radio Fax DX action. It’s not because I haven’t been busy roaming the airwaves, it’s that I’ve been too busy with everything else to be able to post something up. There’s been … Continue reading

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DRM DXing Session: More fun than AM broadcast DXing!

I’ve made a passing mention about DRM in my first post about DRM DXing when I received The Disco Palace from home early in the morning when I couldn’t sleep. But I guess I really should delve into DRM a … Continue reading

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Deutscher Wetterdienst (Hamburg, Germany) Radio Fax – the Ultimate DX?

Deutscher Wetterdienst (also known as DWD for short) is the German Meterological Service. They currently operate a weatherfax service over radio as listed here. The centre frequencies are as follows (from NWS’s documentation): 3855khz at 10kW, callsign DDH3 7880khz at … Continue reading

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Sounds of Fax Modes and ECM

Modem noises annoy many people – and many devices go to great lengths to mute the speaker after connections have been achieved. In fact, most fax machines mute the speaker as soon as the first HDLC 300bps Phase B data … Continue reading

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DRM Radio: The Disco Palace

So, one night, I couldn’t sleep so I stayed up scanning the airwaves with my Winradio Excalibur G31DDC and my Wellbrook Communications ALA-1530 loop antenna. I stumbled across a strong DRM radio transmission (i.e. digital shortwave). Digital Radio Mondiale (DRM) … Continue reading

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JMH/JMH2/JMH4 Japan Meterological Agency Radio Fax

JMH/JMH2/JMH4 are a set of radiofax stations transmitting from Tokyo, Japan. They had many more transmitters formerly – hence the “gaps” in the numbering, luckily they haven’t discontinued the service altogether. Transmissions are all made at 5kW, and all three … Continue reading

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VMC/VMW Australian Bureau of Meterology Radio Fax

The Australian Bureau of Meterology operates two radiofax stations – VMC and VMW. VMC broadcasts from Charleville, QLD, and VMW broadcasts from Wiluna, WA. These stations broadcast nearly around the clock with 1kW transmission power. The frequencies, technical information and … Continue reading

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HLL2 Seoul Korea Radio Fax

A new station for me – unfortunately, I can’t seem to find who is responsible for broadcasting this station, otherwise I’d try to claim a QSL from them too. This station broadcasts on centre frequencies: 3585 kHz 5857.5 kHz 7433.5 … Continue reading

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KVM70 – 9982.5khz Great Propagation

Oh my, what a difference a few days makes. So I tune in to one of my old-reliable stations – KVM70. Formerly, messy, terribly doppler spread affected station with moderate SNRs – tonight it’s coming through better than usual on … Continue reading

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A demonstrative subset of my ticket collection …

In conjunction with my previous article on Cityrail and EFTPOS machines, I have decided to post a subset of my vast ticket collection illustrating some of the characteristics of the tickets. While my collection can’t be said to be “old” … Continue reading

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Cityrail Ticket Vending Machines and EFTPOS

It’s been a while coming but Cityrail commuters would have noticed that many of their ticket vending machines are now equipped with EFTPOS terminals allowing for payment by chip-card. Both newer (yeah, they’re old hat) touch screen terminals and older … Continue reading

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NMG NOAA New Orleans Radio Fax

Now this is what you call DX – we’re receiving transmissions from New Orleans, Louisiana, USA! Sure, the quality can’t be expected to be good, but they’re “apparently” transmitting with 4kW – the same amount of power as Hawaii, but … Continue reading

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KVM70 NOAA Honolulu, Hawaii Radio Fax

Another good radiofax station for DXing is the KVM70 station at Honolulu, Hawaii run by NOAA. This station sends faxes almost continuously around the clock and at least one frequency is usually observable, although sometimes interfered with and or weak. … Continue reading

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JJC/9VF Kyodo News Radio Fax

As a case of last of the era, radio station JJC in Japan and 9VF in Singapore operated by Kyodo News in Japan is the last marine weather fax station which faxes daily news and navigational warnings. It is especially … Continue reading

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A closer look at DGPS data

After the discovery that I could indeed receive and decode DGPS correction data using Spectrum Lab and my old IC-R75, I wasted no time and got cracking on it. Data was being logged, and I was happy. When presented with … Continue reading

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DGPS Data Reception

In one of my previous posts on LF, I mentioned DGPS beacons as part of the transmissions one could hear in these bands. For those who haven’t seen the video and heard the “noises” – the video is linked here. … Continue reading

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NDB Band Spectrogram

Following on my earlier post about LF, MW and AM radio – here’s a picture of what the NDB band (200-520khz) looks like at night (click for full image – super compressed JPG – 2Mb 13107 x 1013px!): Look at … Continue reading

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VLF, LF and MW Radio – NDB Hunting, ATIS, DGPS and Broadcast

[Very short videos this time … no lectures!] Low Frequency (LF for short) is the band (30khz-300khz) that sits below HF. This band is also somewhat special, and I enjoy monitoring for stations here as well. Its propagation characteristics vary … Continue reading

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