A while ago I spoke about feeding an external reference to the LimeSDR USB. Now I wanted to use an external reference with the LimeSDR Mini that I have in my QO-100 groundstation to lock all the system to GPS. Preferably I wanted to use 27MHz as the reference, since this is what I am… Continue reading Using an external reference with the LimeSDR Mini
Results for "QO-100"
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Sun observations at 10GHz
Around October 9 it was the sun outage season for Es’hail 2 as seen from Madrid. This means that the sun passed behind Es’hail 2, so it was the perfect occasion to observe the sun with my QO-100 groundstation, which has a 1.2m offset dish antenna pointing to Es’hail 2. This is an account of… Continue reading Sun observations at 10GHz
Measuring the gain of a dish
Here I want to show a technique for measuring the gain of a dish that I first learned from an article by Christian Monstein about the Moon’s temperature at a wavelength of 2.77cm. The technique only uses power measurements from an observation of a radio source, at different angles from the boresight. Ideally, the radio… Continue reading Measuring the gain of a dish
An overview of IARU R1 interim meeting proposals
The IARU R1 interim meeting is being held in Vienna, Austria, on April 27 and 28. This post is an overview of the proposals that will be presented during this meeting, from the point of view of the usual topics that I treat in this blog. The proposals can be found in the conference documents.… Continue reading An overview of IARU R1 interim meeting proposals
New dish for Es’hail 2 reception
I have replaced the dish I had for receiving Es’hail 2 by a new one. The former dish was a 95cm offset from diesl.es which was a few years old. I had previously used this dish for portable experiments, and it had been lying on an open balcony for many months until I finally installed… Continue reading New dish for Es’hail 2 reception
Es’hail 2 frequency measurements
After being busy with other projects, I have resumed my frequency measurements of the Es’hail 2 beacons. The last measurement I performed was made when the satellite reached its operational slot at 26ºE. After manoeuvering to this spot, the Doppler was very small, on the order of 0.8ppb peak-to-peak, indicating a very accurate geostationary orbit.… Continue reading Es’hail 2 frequency measurements
Talks
2024-02-17, MicroMeet 2024, Técnicas de observación en Radioastronomía. PDF slides (in Spanish). 2024-02-04, FOSDEM 2024, Maia SDR: an open-source FPGA-based project for AD936x+Zynq radios. PDF slides. 2023-09-18, AMSAT-DL Symposium 2023, Amateur Decoding of Deep Space Missions. PDF slides. 2023-06-24, Software Defined Radio Academy 2023, Maia SDR: An open-source FPGA-based SDR project focusing on the ADALM… Continue reading Talks