Equipment information

Marconi TF 2300 Level Meter
Manufacturer
Marconi
Model TF 2300
Date 1969
Category: Measurement instruments
Group Level Meter
Description 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.

These manuals are available for the above equipment:

Manual Type Service and User Manual Marconi-7805-Manual-Page-1-Picture
Pages 74
Size 3.80 Mbytes (3986953 Bytes)
Language english
Revision
Manual-ID/Number EB 2300 Id
Date March 1969
Quality Scanned document, all readable.
Upload date
MD5 5171af2bb176d719c23a4aa19d5167f7
Downloads 44 since 28 May 2016
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
Marconi-7805-Manual-Page-1-Picture


Manual Type Service and User Manual Marconi-7880-Manual-Page-1-Picture
Pages 67
Size 6.22 Mbytes (6526147 Bytes)
Language english
Revision
Manual-ID/Number
Date March 1969
Quality Scanned document, reading partly badly, partly not readable.
Upload date
MD5 437014ca95176d69f38bb4f24b9b1560
Downloads 52 since 05 June 2016
Information
Marconi-7880-Manual-Page-1-Picture


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