Marconi TF 2300 Level Meter
Hersteller:
Modell:
TF 2300
Datum:
1969
Kategorie:
Gruppe:
Beschreibung:
F.M./A.M. Modulation Meter
Information
The TF2300 Modulation Meter is primarily for measurement of f. m. deviation but it also measures a.m. depth. With its wide range of deviation frequency, modulation bandwidth and carrier frequency, this instrument is suitable for application to fixed and mobile point-to-point communications, broadcasting, telemetry and multi-channel link equipment in the h. f. , v. h. f. and u. h. f. bands. Distortion and channel separation tests on f. m. stereo receivers and transmitters can also be made. Positive and negative f. m. deviation can be measured in ranges from 5 kc/s to 500 kc/s full-scale at modulation frequencies between 30 c/s and 150 kc/s. A. M. depth can be measured up to 95% in a 30 e/s to 15 kc/s modulation bandwidth. Either f. m. or a. m. can be measured in the presence of the other. Although measurements are normally made by means of the meter readout, i. f. and demodulated outputs are available at the front panel for examination or analysis. Spurious a. m. and f. m. due to hum and noise are kept to a level insignificant for most applications but, where required, crystals can be switched in to control the local oscillator, or an external local Oscillator may be used. The instrument can be operated without a local Oscillator for measurements in the 1-2 Me/s range. The instrument can be operated from mains power or a nominal 24 V battery. Voltage regulation eliminates transformer tap changing except between 115 V and 230 V ranges. On battery, the regulation compensates for battery voltage variations between 21.5 and 30 V. Transistorized circuits consuming little current give reasonable length of operation on battery for mobile purposes.

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Service- und Bedienungsanleitung
Dokumenttyp:
Service- und Bedienungsanleitung
Seiten:
67
Größe:
6.22 Mbytes (6526147 Bytes)
Sprache:
english
Revision:
Dokument-ID:
Datum:
März 1969
Qualität:
Gescanntes Dokument, teilweise schwer oder teilweise nicht zu lesen.
Upload Datum:
05 Juni 2016
MD5:
437014ca95176d69f38bb4f24b9b1560
Downloads:
272
Service- und Bedienungsanleitung
Dokumenttyp:
Service- und Bedienungsanleitung
Seiten:
74
Größe:
3.80 Mbytes (3986953 Bytes)
Sprache:
english
Revision:
Dokument-ID:
EB 2300 Id
Datum:
März 1969
Qualität:
Gescanntes Dokument, alles ist lesbar.
Upload Datum:
28 Mai 2016
MD5:
5171af2bb176d719c23a4aa19d5167f7
Downloads:
219
Information
Section 1 GENERAL INFORMATION Section 4 MAINTENANCE 1. 1 Introduction ... ... ... 3 1. 2 Data summary ... ... 4 1.3 Accessories 6 Section 2 OPERATION 2. 1 Installation ... ... ... 7 2. 2 Power supply ... 7 2. 3 Controls ... ... ... 8 2.4 Preparation for use 10 2. 5 Measuring f. m. deviation 10 2. 6 Measuring a.m. depth 11 2. 7 Measuring f. m. on a, m. 11 2. 8 Measuring a. m. on f. m. 12 2. 9 Noise measurements ... ... 12 2. 10 Oscillator arrangements 14 2. 11 Measurement in 1 to 2 Me/s range 15 2. 12 Asymmetric modulation and carrier shift ... 15 2. 13 Use of 1. f. output terminals 16 2.14 Use of i. f. output socket 16 2. 15 Crystal selection ... ... 16 2. 16 F. M. stereo measurements 17 2.17 Phase modulation and telemetry deviation ... ... 20 2. 18 Stray fields ... ... ... 20 Decibel conversion table 21 Section 3 TECHNICAL DESCRIPTION 3.1 System operation ... 23 3.2 Power unit ... ... ... 24 3.3 Mixer ... ... ... 25 3.4 Local Oscillator 25 3.5 I. F. Amplifier ... ... 26 3.6 Limiter ... ... ... 26 3.7 Discriminator ... ... 26 3.8 Calibrator ... ... ... 26 3. 9 Low-pass filters ... ... 27 3. 10 1st 1. f. Amplifier ... ... 27 3. 11 2nd 1. f. Amplifier ... 27 3.12 Peak reading meter ... ... 28 3.13 A. M. detector ... ... 28 3.14 Between-units circuitry on chassis 28 4. 1 4. 2 4. 3 4.4 Introduction ... ... Access and layout Performance checks Component layout illustrations Cleaning and lubricating Section 5 REPAIR Section 6 REPLACEABLE PARTS Introduction Section 7 CIRCUIT DIAGRAMS Circuit notes ... Fig. 7.1 Inter-unit wiring Fig. 7.2 Mixer, Oscillator and i. f. Amplifier Fig. 7.3 Limiter, discriminator and 1st 1. f. Amplifier Fig. 7. 4 2nd 1. f. Amplifier and voltmeter Fig. 7.5 A.M. detector and Calibrator Fig. 7. 6 Power supply unit

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