| M4 - AC measurements | ||||
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Geloso, Italy | Tipo 421 | Heterodyne capacitance meter | |
| General Radio, USA | 1219A | Pulse amplifier | ||
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General Radio, USA | 1390-B | Random noise generator | |
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General Radio, USA | 1650A | Impedance bridge | |
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Gertsch, USA | CBR-4 | Complex ratio bridge | |
| Military | TS-730/UPM | Summation bridge | ||
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Military | TS-147D/UP | X-band analyzer | |
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Military | TS-148/UP | X-band spectrum analyzer | |
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Military | TS-541A-TPS | X-band analyzer | |
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TIC, USA | 310A | RF Z-angle meter | |
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TIC, USA | 311A | RF Z-angle meter | |