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Marconi TF 1370A

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Marconi TF 1370A This document was generated by me, Colin Hinson, from a Crown copyright document held at R.A.F. Henlow Signals Museum. It is presented here (for free) under the Open Government Licence (O.G.L.) and this version of the document is my copyright (along with the Crown Copyright) in much the same way as a photograph would be. The document should have been downloaded from my website https://blunham.com/Radar, if you downloaded it from elsewhere, please let me know (particularly if you were charged for it). You can contact me via my Genuki email page: https://www.genuki.org.uk/big/eng/YKS/various?recipient=colin You may not copy the file for onward transmission of the data nor attempt to make monetary gain by the use of these files. If you want someone else to have a copy of the file, point them at the website. It should be noted that most of the pages are identifiable as having been processed my me. _______________________________________ I put a lot of time into producing these files which is why you are met with the above when you open the file. In order to generate this file, I need to: 1. Scan the pages (Epson 15000 A3 scanner) 2. Split the photographs out from the text only pages 3. Run my own software to split double pages and remove any edge marks such as punch holes 4. Run my own software to clean up the pages 5. Run my own software to set the pages to a given size and align the text correctly. 6. Run Omnipage (Ulitimate) on all the pages to OCR them. 7. Generate a searchable Acrobat pdf file. Hopefully after all that, I end up with a presentable file, though I can’t guarantee there aren’t errors in the OCR. If you find missing pages, pages in the wrong order, anything else wrong with the file or simply want to make a comment, please drop me a line (see above). It is my hope that you find the file of use to you personally – I know that I would have liked to have found some of these files years ago – they would have saved me a lot of time ! Colin Hinson In the village of Blunham, Bedfordshire. AIR PUBLICATION 117E-0101-13D AUDIO AND VIDEO SIGNAL GENERATOR 6625-99-104-7574 (MARCONI INSTRUMENTS TF 1370A) GENERAL AND TECHNICAL INFORMATION AND SCALE OF SERVICING SPARES BY COMMAND OF THE DEFENCE COUNCIL 0hAiwitt. Ministry of Defence FOR USE IN THE ROYAL AIR FORCE (Prepared by the Ministry of Aviation Supply) A.L.4, Mar 71 A.P. 117E-0101-1'3 SUPPLEMENT This instrument is the Marconi Instru- (8) C32 value changed from 4 p.,F, 50 V ments Wide Range R-C Oscillator, TF 1370A working to 4 µF, 300 V working. and is also known as Signal Generator, 6625-99-104-7574. (9) VT1 type 2G403 changed to type 2N3324 This Air Publication describes the latest (10) FS2 value changed from 250 mA to models. Earlier models may be slightly 500 mA. different owing to the following changes:- (11) Junction of R131 and VT2 collector (1) R30 value changed from 2.2 MS2 to was connected to MR3A. 1.8 MS2 to improve output reaction. (12) The earth connection between mains (1a) R30 changed from 1.8 MS2 to 1 MS-2. socket, PLA, and the power supply R130 (820 kg) added in series with R30. chassis re-routed from PLA to output socket, SKTD, shroud on front panel (2) R34 value changed from 82 kg to 120 kg. via two paths around right-hand dish plate to form a shorted-turn loop, (3) R38 (150 C2, 1 W) added between junction thereby reducing mains hum at the of R44/C40 and C27 to remove ripple. output socket. (4) R46 value changed from 2.7 kg to (13) R139 changed from 2.2 kg to 1.5 162. 1.8 162. (14) C8 (47 pF) and C6 (2. 5-40 pF) (in (5) R81 (33 S2, 1 W) has been replaced by parallel) removed. RV13 (680 Q, 1 W) as it was not prac- Were connected to Range Switch SAc tical to select resistor in calibration. contact opposite R3 as C4 is connected to contact opposite R1. (6) R121 value changed from 10 162 to 100 S-2 to stop frequency bounce. (15) C2 (10 pF) replaced by C6 (2. 5-40 pF). (7) R129 (4. 7 kg) added from pin 6 of V5 to (16) C65 changed from 0.001 H.F to RV10 to improve 'SAG' control. 0.002 p.F. A. L. 3, May 70 CORRIGENDA TO A.P. 117E - 0101 - 16 AUDIO AND VIDEO SIGNAL GENERATOR TF 1370A This instrument is the Marconi Instru- (6) R121 value changed from 10 1d2 to 100 SI ments Wide Range R-C Oscillator, TF 1370A to stop frequency bounce. and is also known as Signal Generator, 6625- 99-104-7574. (7) R129 (4.7 kS2) added from pin 6 of V5 to RV10 to improve 'SAG' control. This Air Publication describes the (8) C32 value changed from 41.LF, 50 V latest models. Earlier models may be slightly working to 4 p.F, 300 V working. different owing to the following changes:- (9) VT1 type 2G403 changed to type 2N3324. (10) FS2 value changed from 250 mA to (1) R30 value changed from 2.2 MO to 500 mA. 1.8 MS2 to improve output reaction. (11) Junction of R131 and VT2 collector was (2) R34 value changed from 82 ld2 to 120 1d2. connected to MR3A. (3) R38 (150 I-2, i W) added between junction (12) The earth connection between mains of R44/C40 and C27 to remove ripple. socket, PLA, and the power supply chassis re-routed from PLA to output (4) R46 value changed from 2.7 Id2 to 1.8 1d2. socket, SKTD, shroud on front panel via two paths around right-hand dish (5) R81 (330, 1/4 W) has been replaced by plate to form a shorted-turn loop, RV13 (680 12, 1/4 W) as it was not prac- thereby reducing mains hum at the tical to select resistor in calibration. output socket. 1370A (MIN) AP 117E-0101-13 i CONTENTS Chapter 1 GENERAL INFORMATION 1.1 Features ... 3 1.2 Data summary ... ... 4 1.3 Accessories • • . 5 Chapter 2 OPERATION 2.1 Installation • .. ... ... 8 2.2 Switching on 400 40* 8 2.3 Sine and square wave outputs • • • • • • 8 2.4 Controls and connectors ... 006 8 2.5 Adjusting frequency ... • • • • • • 10 2.6 Setting output voltage ... • • . • • • 10 2.7 dB readings ... • • • • • • 13 2.8 Setting up audio standard output 000 14 2.9 Adjusting square wave sag and mark/ space ratio 15 2.10 Use of accessories • • • • • • 15 Chapter 3 TECHNICAL DESCRIPTION 3.1 Circuit arrangement ••• • • • 18 3.2 Oscillator . ••• 18 3.3 20 dB amplifier ••• 19 3.4 Schmitt trigger ••• 19 3.5 Output cathode follower 20 3.6 Output monitor ••• 20 3.7 Output connections ••• 20 3.8 Regulated h. t. supply ••• 22 3.9 Regulated 1. t. supply •• • 22 Chapter 4 MAINTENANCE 4.1 General ... ... ... 000 24 4.2 Fuses 000 004 ... •• . 24 4.3 Input supply voltage 000 ... 24 4.4 Removing case or dust cover • . • .06 25 4.5 Replacement of panel lamps 0O. *00 25 4. 6 Replacement of valves and transistors • • • 25 4.7 Preset adjustments . • • 000 26 4 .8 Drive cord ... 000 Oe. 29 4.9 Functional checks ... ... 29 COMPONENT LAYOUT ILLUSTRATIONS • •• ... 31 REPLACEABLE PARTS ... ... ... 35 DECIBEL CONVERSION TABLE ... 41 Chapter 5 Not assigned Chapter 6 Not assigned Chapter 7 CIRCUIT DIAGRAMS Circuit notes Fig. 1 Power supply - circuit Fig. 2 Oscillator and squaring stages - switch details Fig. 3 Oscillator and squaring stages - circuit Fig. 4 Monitor and output stages - switch details Fig. 5 Monitor and output stages - circuit 1370A (1b)M AL 8, May 72 A.P. 117E-0101-1S 1) I GENERAL INFORMATION 1.1 FEATURES the quality of the square wave output also renders the instrument particularly effective The TF 1 370A is a general-purpose sine for such purposes as rapid testing of audio wave generator covering the frequency range amplifier bandwidth. 10 Hz to 10 MHz. It also delivers a high - quality square wave output at frequencies The signal originates in a Wien bridge between 10 Hz and 100 kHz. oscillator covering 10 Hz to 10 MHz in six decade bands, the top band extending from 1 The instrument is primarily a signal to 10 MHz. A single scale is used for the source for measurements and tests on audio four lower bands and separate scales for and video amplifiers and networks. With the two upper bands; this gives a total scale its four output impedances - 600, 130, 100, length of 270 mm and makes a 1% change in and 75 S2 - it is suitable for use with trans- frequency easily discernible. mission lines, filters, attenuators, etc. TF 1370AR is a rack-mounting version Among other applications as a sine of the TF 1370 and is supplied, complete wave generator is that of providing the excit- with dust cover, for mounting in a standard ation voltage for a. f. and r. f. bridges. And rack. SUPPLY -ON WIDE RANGE R-C OSCILLATOR 1170A S£R f A 56124/0e 5 MARCONI INSTRUMENTS E NGtANG aTT£NOATEt GUIP.JT v r 1 I ATTEN fRE u ftcy SQUARE GE SANE , -• • ♦ ri g. A. L. 7, Sep. 71 1370A (113)M 3 General information 1.2 DATA SUMMARY FREQUENCY Range: Sine waves 10 Hz to 10 MHz in six decade bands.
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