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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment.

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Old 23rd Mar 2017, 9:53 pm   #21
trh01uk
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Default Re: WWII oscilloscope bandwidth mystery?

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Originally Posted by astral highway View Post
One mystery - with the development of a 12cm magnetron in the later stages of the war, how did test and measurement equipment keep up? I know they used Lecher lines to resolve the wavelength physically, using a bulb as a load, eg in the initial first trial in the lab. but presumably there were times when a 'scope trace would be needed?
When you do RF design work, scopes are rarely used. And that's because all you are going to see is a sine wave, and that's really not very interesting in the time domain. There will be some harmonic content of course, but you are not going to see any distortion of the sine wave typically unless its very extreme.

Harmonic content is better examined on a spectrum analyser in the frequency domain. These weren't available during WWII either, but who cared. No-one else was working even at 3GHz, so there was no need to worry about interfering with someone else at 6, 9 or 12GHz!

The first time I needed a scope at VHF (around 100MHz) was when I started design of frequency synthesisers at Pye Telecom in the late 1970s. I had to design the frequency dividers nearly from scratch because back then there were very ICs on the market to do the job. I had to design a transistor stage for instance to interface between ECL and CMOS - and that did require a scope. I used a sampling scope, which showed up voltage levels and rise and fall times. As I recall it had a bandwidth out to about 2GHz with the right probes.

Richard
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