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Old 10th Sep 2020, 5:24 pm   #1
AlanC
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Default Martin L Michaelis MA

I was recently sorting through a pile of old mags and in a Practical Television (May 1968) there is a design for a radiation meter by the above named author, which brought back memories of seeing his designs in many a PT and PE from the 60's and 70's.

He is memorable to me because he chose to offer designs for complex and often fairly esoteric instruments, which were always superbly engineered- often using complex circuits with many DC coupled transistors and the explanations given in the text of the article usually dealt in depth with the theoretical concepts as well as the practical application and implementation. Many would also have cost a lot of money to build.

I imagined that he must have worked in professional electronics, probably designing complex laboratory instrumentation in order to have developed the knowledge that some of his designs would have required, but have never been able to find any reference to him on the web.

So it's only out of curiosity but I just wondered if anyone has any knowledge of Martin L Michaelis, or did you build any of his designs?

Alan
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Old 12th Sep 2020, 8:27 am   #2
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Default Re: Martin L Michaelis MA

I could only find one hit on google viz:-



martin l. michaelis, ma - American Radio History
www.americanradiohistory.com › Technology-All-Eras
to any peaking coils. This has led to a cut-off frequency around 5MHz for the Y -amplifier with useful gain up to at least 7MHz. This is adequate for colour ...
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Old 12th Sep 2020, 10:31 am   #3
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Default Re: Martin L Michaelis MA

Name doesn't ring any bells at all.

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Old 12th Sep 2020, 10:58 am   #4
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Default Re: Martin L Michaelis MA

https://www.vintage-radio.net/forum/...d.php?p=184831
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Old 12th Sep 2020, 6:33 pm   #5
AlanC
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Default Re: Martin L Michaelis MA

Thanks all.
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Old 13th Sep 2020, 2:24 am   #6
Terry_VK5TM
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Default Re: Martin L Michaelis MA

He was a West German ham radio operator - callsign DK1MM.

References to him also turn up in magazines like 73 Amateur Radio, Funk Amateur and various other obscure publications - all in reference to amateur radio and electronic projects..

He also wrote a book

Martin Michaelis, DK1MM, Bauanleitungen für Funkamateure und Hobbyelektroniker
208 Seiten, ISBN 3-88180-330-0

Roughly translated to - building instructions for radio amateurs and hobby electronics

I can't find any info on his birth, death etc but I suspect he has passed on, his callsign is now held by someone else.
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Old 13th Sep 2020, 4:21 pm   #7
AlanC
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Default Re: Martin L Michaelis MA

Thanks Terry- good info.
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Old 17th Sep 2020, 10:37 pm   #8
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Default Re: Martin L Michaelis MA

Hi!

Amongst the construction projects he produced were:-

a) The "Experimenter's Power Pack";
b) A stereo push–pull amplifier with two PCC85 output valves;
c) An a.c. power stabiliser;
d) An Enlarger Lamp Controller with PL36 h.t. regulator valves;
e) A number of novel valve & transistor testers:
f) Pulse generator projects for testing video amplification;
g) Several Oscilloscope designs;
h) Experimental projects for "field sequential colour television";
i) Geiger counters & ratemeters;

. . .and he also covered the theory of Thunderstorms in quite some detail in the October 1966 issue of P.E!

However amongst the innumerable valved designs he also came up with I don't recall him ever using a magic–eye for anything!

Chris Williams
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Old 21st Sep 2020, 10:10 pm   #9
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Default Re: Martin L Michaelis MA

Thanks Chris- which when you think about all of those instruments is surprising really! I must look some of those articles out.
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Old 27th Sep 2020, 10:44 pm   #10
Chris55000
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Default Re: Martin L Michaelis MA

Hi!

I forgot to mention Mr. Michaelis also published construction plans for the "Audion", a combined oscilloscope, meter, LCR bridge, a.f. gen and workshop PSU in several 1964 issues of P.W., almost exactly ten years after P.W's June 1954 "Comprehensive Test Unit", which did contain both an EM34 null–balance indicator and a CRT, but Mr. Michaelis didn't carry on with an eye indicator, he used the DH3–91/1CP1 loctal–base auto–focus CRT as indicator for all functions!

Chris Williams
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Old 28th Sep 2020, 10:56 am   #11
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Default Re: Martin L Michaelis MA

A familiar name. I have here in front of me a copy of Practical Wireless of December 1963 where he has an article "Radioactivity in Rain" - a really well-researched and well-written article - it's real science! That article and his preceding "Advanced Geiger Head" articles prompted me some years later to try out some similar experiments. Somewhere I'm sure I still have a letter from him - he was kind enough to answer a load of my stupid questions. He was a really impressive engineer and scientist.
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