You can do all of that cleanly in DuckDB using one SQL pipeline: combine date+time → filter by ID → build hourly pivot. I’ll assume your CSV has columns like:…
Keep only the first 100,000 rows and save them COPY ( SELECT * FROM ‘large.csv’ LIMIT 100000 ) TO ‘small.csv’ (HEADER, DELIMITER ‘,’); Extract a range of rows (e.g. rows…
In Excel, you typically do this with either IF, IFS, or lookup functions depending on what you mean by “select based on content”. Here are the most common patterns: 1)…
This is an example of a clock source which can be used with SDRs that will accept external clocks for e.g. pulsar observations – the recommendation was made by a…
A Kalman filter is a mathematical method used to estimate the true position and motion of a system when the measurements are noisy. For a radio dish, it can make…
The Airspy Mini has a maximum IQ sample rate of 6 MSPS, giving a maximum instantaneous bandwidth of approximately 6 MHz. However, there are a few subtleties: Available sample rates:…
Yes — there are a few very well-reviewed ~100Wh (airline-safe) power banks, but they are almost all from established brands (Anker, Nitecore, Ugreen). The key point is: anything near 100Wh…
The Lidl Ultimate Speed UPK 10 H5 (also sold as a jump starter / power bank / compressor unit) has fairly well-documented specs. Here are the key values you asked…
To convert a power bank from mAh to mWh, you need to know the voltage (V) of the battery. Key formula mWh = mAh × V Why this works mAh…
You can transfer photos from your Sony A7 to your phone using Sony’s app. The exact steps depend on which A7 model you have, but the general process is similar.…
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