Concurso Atlántico V-UHF
Today, I've participated in this month's national V-UHF from Cerro de San Pedro, SOTA summit EA4/MD-020 (1425m). I arrived the summit a bit before 10:00UTC and worked until the end of the contest...
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Phase noise of 27MHz references for a Ku-band LNBF
Today, I've being measuring the phase noise of the different 27MHz references that I have for my Ku-band LNBF. The LNBF is an Avenger PLL321S-2. I've modified it, removing the 27MHz crystal and...
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Several 10GHz beacons on WebSDRs
I have being receiving several 10GHz on different WebSDRs with linrad to get a rough idea of the performance of the beacons and receivers, both in terms of frequency stability and phase noise. Here are...
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Ship reflection on ED5YAE 10GHz beacon
In my previous post, I mentioned the possibility of receiving 10GHz beacons reflecting off ships in the Mediterranean sea through the Paella Team WebSDR, in Alicante. Luis EA5DOM tells me that these...
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Phase noise of a Baofeng UV-5R 10GHz signal
Several of the Baofeng chinese handheld radios generate a weak 10GHz signal while in receive mode. Thus, they are a popular cheap and quick 10GHz signal source for tests. To generate a 10GHz signal,...
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Update on phase noise of 27MHz references
This is a follow up to a previous post where I investigated the phase noise of 27MHz references to be used for a 10GHz receiver. Dieter DF9NP has being kind enough to send me a 10MHz 0.25ppm TCXO to do...
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Arduino aquarium controller
Just a quick note that I've finally put the page for my Arduino aquarium controller. This is a project that I built several years ago to control a small aquarium at home. I built it with through-hole...
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Improving phase noise performance of the DF9NP 27MHz PLL
In some of the latest posts, I've being talking about the phase noise performance of 10GHz receivers, and in particular, of 27MHz references for Ku-band LNBFs (1, 2, 3, 4). Indeed, this started when I...
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Concurso Nacional V-UHF
Today I've hiked up with my father to Siete Picos, SOTA summit EA1/SG-005 (2138m), to participate in this month's national V-UHF contest. We arrived and set up around 07:30UTC and worked until...
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Receiving the Vaisala RS92-SGP radiosonde launched from Madrid-Barajas
Each day, at 01:00UTC and 11:00UTC a Vaisala RS92-SGP radiosonde is launched from Madrid-Barajas airport. This is a small electronics package tied to a helium balloon that ascends up to between 24 and...
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Linear 12V 5A power supply
I wanted to build something easy and useful this summer, so I have gone with a 12V (also adjustable to 13.8V) 5A linear power supply. The design is based on the 12V 15A power supply by Ed WA1TWX that...
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Recovering an RS92-SGP radiosonde
A few days ago, I talked about the radiosondes that are launched every 12 hours from Madrid-Barajas Airport. Yesterday, I went with my mother on a trip to try to recover the radiosonde that was...
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RS92-SGP: Interfacing the EEPROM to a 5V microcontoller
I've started to experiment with the RS92-SGP radiosonde that I recovered some days ago. The radiosonde has a M95256-W 32KB SPI EEPROM where all the code and settings are stored, since the onboard...
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Decoding packets from 3CAT2
On 15th August, a Chinese CZ-2D rocket launched three satellites from Juiuquan (Mongolia). The main payload was the Chinese satellite QSS, designed to do some experiments in quantum communications and...
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RS92-SGP: trying to change the frequency with an external reference
In a previous post, I talked about the possibility of changing the transmit frequency of a Vaisala RS92-SGP radiosonde by modifying the settings on its EEPROM. The lowest frequency you can achieve...
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How hard is it to decode 3CAT-2?
In a previous post, I looked at the telemetry packets transmitted by the satellite 3CAT-2. This satellite transmits 9600bps AX.25 BPSK packets in the Amateur 2m band. As far as I know, it is the only...
View ArticleTelemetry format of 3CAT-2
The team from the NanoSat Lab in Universidad Politècnica de Catalunya have published a telemetry analyser for 3CAT-2. This analyser is designed to connect to a TCP server and get the AX.25 frames in...
View ArticleIntroducing gr-satellites
This post is to present my gr-satellites project. The goal of this project is to make a collection of GNUradio decoders for the telemetry of different satellites. The decoders support submitting...
View ArticleIARU R1 145MHz contest
Today I hiked with all the family to La Najarra, SOTA summit EA4/MD-013 (2122m), to participate in the IARU Region 1 145MHz contest. Unfortunately, for some weird reason very few stations in Spain...
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HORYU-4 CW telemetry format
HORYU-4 is a small satellite from Kyushu Institute of Technology (Japan) designed to test a high voltage solar array in space and observe the effects produced by the charge on the spacecraft due to the...
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