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Max freq of test equipment

Many measuring devices have a maximum frequency up to which they work correctly, as stated by the manufacturer. Above that frequency they don’t just stop working, rather they still have a range above where they still may work correctly, just aren’t as sensitive. Many oscilloscopes, for example, can work up to twice their bandwidth, but the measured amplitudes are not more than some random numbers. You can still see the waveform, but not do any meaningful measurements.

Ext 10MHz for Hameg HM8021

For a long time I wanted to calibrate the Hameg 8021-2 to my external 10MHz GPSDO. But, unfortunately, the crystal oven is not very stable. My thought was, why calibrate if you can use the back BNC connector to feed the external 10MHz signal from the GPSDO? So, this was an easy task. Find the internal 10MHz, disconnect it, connect to rear via 1nF capacitor. Done ;)

Linux: all shell commands

Here are some useful Linux CLI commands, I will do more good examples in the future. For Germans: #maleben

Panasonic RF-P50 Page

The Panasonic RF-P50 is a small portable/pocket AM/FM radio, with telescopic antenna and a bar antenna inside. It has somehow good sensitivity and selectivity on AM, also tuning is very precise and smooth. Beware: there is RF-P50D (with D at the end) version of the radio, but it’s the DSP version of it. Does not tune smoothly, and the RX is not as good as it can be in analog mode.

King Size MTU 9000

Ethernet has become the backbone of nearly all modern networks, whether at home, in the office, or in large-scale data centers, where speeds range from 1G to as high as 100G or even 400G. However, there’s one often-overlooked aspect where you can truly optimize your network: the MTU (Maximum Transmission Unit).