m22. Old measuring instruments - XXII
C.
Technical reflections (Reflecties door LA8AK)
F)
Surplus equipment
L. VLF,
MF and 136kHz equipment ideas
m1. LC
and Q-meters
m2. RF
detectors, level meters, attenuators, dummy loads, signal
dividers
m3. RF
signal- and power generators
m11 Grid
dip meters
m12
Power- and VSWR-meters
m21
Norwegian instruments
m23.
Signal-to-noise-meter
m31.
LF/Audio instruments
22.1)
Audio frequency spectrum analyzer anno
1939.
In Electronics November 1939 pg. 76-77
is an article with "Diagrammic representation of the
functioning of the audio frequency
spectrometer. Only one bandpass-filter is shown although
twenty-seven are employed in practice, The spectrum appears on
the screen
of a cathode ray tube.
22.2)
Radiometer Multimeter MM1f modification for better reading for
0.05-1µH inductance
22.3)
TEKADE Träger-Frequenz
Meßkoffer 5-155kHz (later German term is Selektiver Pegelmesser),
Suppose this is the first selective voltmeter ever made. They
were used to measure levels on multi-channel
carrier frequency systems. One such instrument were placed in
Kristiansand, another in Arendal since it was
subsea coaxial cables to Denmark, believe it was a 15-channel
system (MG15) during the war and many years after.
See Die deutschen Funknachrichtenanlagen
Band2 "Der Zweite Weltkrieg" pg139
See application on pg-33b, pg-k61 and pg-k62
TEKADE Träger-Frequenz
Meßkoffer (Circuit diagram)
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22.4)
Philips GM7633 Cartomatic III
Old tube testers and other instruments,
see http://www.one-electron.com/FC_TestEquipment.html
Nolan Lee's site for tube testers
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Felix Martin, Optician &
Compass adjuster, Prospect Place, Swansea
Repetition course in navigation 1894
2004.09.24
