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Friday, July 31, 2020 | History

2 edition of quality-checking receiver for V.H.F. F.M. sound broadcasting found in the catalog.

quality-checking receiver for V.H.F. F.M. sound broadcasting

C. G. Mayo

quality-checking receiver for V.H.F. F.M. sound broadcasting

by C. G. Mayo

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  • 6 Currently reading

Published by B.B.C. .
Written in English


Edition Notes

Statementby C.G. Mayo and R.E. Jones.
SeriesB.B.C. engineering monograph -- no.25.
ContributionsJones, R. E., British Broadcasting Corporation. Engineering Division.
ID Numbers
Open LibraryOL21090793M

CONTENTS preface 7 abbreviations 9 1superhetprinciples 1 2aerialinputcircuits 6 3tunedinputstage 12 4band-passcoupling 16 ierstage 20 6frequency-changing 24 7oscillatorarrangements 27 ts 31 37 10oscillatortracking 39 iers 43 12variableselectivity 49 13demodulationcircuits 52 ples 57 15delayeda.g.c. 60 16a.g.c.   V.h.f. and u.h.f.: 30MHz to 1GHz. Officially, u.h.f. extends to 3GHz. Lower frequencies are affected by anomalous propagation conditions. Line of sight communications, typically 80km (meteor scatter on 50MHz can provide services up to km). Used for multi-channel point to point communications, FM sound and TV broadcasting and mobile.

Airplane Radio (eavesdrop on Your Pilot): In this instructable, I'll show you how to modify a normal, analog AM/FM (or FM) radio so that it can pick up the broadcasts from airplanes and airplane control towers. First, a little background on how this works. Airplanes broadcast using AM. A. Wide-Deviation F.M. The small reflex klystron used normally for local oscillators in microwave receivers, while not very well suited for pulsed operation, has an unusual property which makes it suitable for f.m. The frequency may be varied 10 Mc. or more without a large variation of power by varying the voltage of the repeller by a few volts.

Automatic reaction will make the receiver sensitive throughout the tuning range. Automatic Reaction L'y the use tuning -condenser and the circuit in Fig. 3, reaction may be automatically adjusted so that the receiver is in a sensitive condition throughout the tuning range. Manual reaction can be a a C> C> f 1:D -a -r C' Mk/. C>. iipplication in televiSion, F.M., and V.H.F. communication rece;vers of all types. This article gives some the perfor­ m:mce data in R.F., I.F., mixer and oscillator circuits. More detailed descriptions ot circuits using the EF9l will be given in future articlesThe static characteristics are listed rable 1. Va V.


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Quality-checking receiver for V.H.F. F.M. sound broadcasting by C. G. Mayo Download PDF EPUB FB2

BBC Monograph A Quality-checking Receiver for V.H.F. F.M. Sound Broadcasting. C.G. Mayo, R.E. Jones. The development of a quality-checking receiver for V.H.F. F.M. sound broadcasting is described.

The results of tests on the original and final prototype models are given; both have a high standard. Monograph Monograph A Quality-checking Receiver for V.H.F. F.M. Sound Broadcasting. C.G.

Mayo. A Quality-checking Receiver for V.H.F. F.M. Sound Broadcasting. As part of its mission, the British Broadcasting Corporation's research department would publish its papers as monographs, covering all manner of scientific and technical information at regular interviews.

These papers have been scanned by the BBC and provided for the public and for history. Monograph Monograph Transistor Amplifiers for Sound Broadcasting. A Quality-checking Receiver for V.H.F. F.M. Sound Broadcasting Monograph published Jan Monograph BBC ENGINEERING DIVISION MONOGRAPH NUMBER JUNE A Quality-checking Receiver for V.H.F.

F.M. Sound Broadcasting by C.G. MAYO, M.A.M.I.E.E. G.J. Phillips, P.T.W. Vance, R.V. Harvey; Oct A Band V Signal-frequency Unit and a Correlation Detector for a VHF/UHF Field-strength Recording Receiver. 25 A Quality-checking Receiver for V.H.F. F.M. Sound Broadcasting Jun 26 Transistor Amplifiers for Sound Broadcasting Aug 27 The Equipment of the BBC Television Studios at Ealing Jan 28 Programme Switching, Control, and Monitoring in Sound Broadcasting Feb 29 A Summary of the Present Position of Stereophonic Broadcasting Apr A Quality-Checking Receiver for V.H.F.

F.M. Sound Broadcasting June Transistor Amplifiers for Sound Broadcasting august THE EQUIPMENT OF THE BBC TELEVISION FILM STUDIOS AT EALING SUMMARY BBC film production facilities for the Television Service are based at the Television Film Studios, Ealing Green, London, W * Editorial: F M Broadcasting after Fifteen Years * Tests of Mixed Polarisation for vhf Sound Broadcasting * Modernisation of the BBC Telegraph System with an Automatic Data Exchange * Solid-state Video Switching Matrix * Permissible Bass Rise in Talks Studios.

A Quality-checking Receiver for V.H.F. F.M. Sound Broadcasting. C.G. Mayo, R.E. Volume X, Broadcasting service (sound), Report X l V t h Plenary Assembly, Kyoto () 6 T I N G L E Y, M, ' U S multichannel television sound technical standards', I B CIEE Conf Puhl7 E I L E R S, C G, ' T V multi-channel sound, the B T S C system', IEEE Trans.

Consumer Electronics, CE, 1, (February ) 8. limiters and cliscriminators, and frequency modulated receivers, will be welcome. The co-author who has undertaken the task is well qualified to do so because he has been responsible for writing instructions concerning BBC's v.h.f. (f.m.) sound broadcasting station at FYrotham in Kent, which came into regular service on.

A Quality -Checking Receiver for V.H.F. F.M. Sound Broadcasting JUNE Transistor Amplifiers for Sound Broadcasting AUGUST The Equipment of the BBC Television Film Studios at Ealing JANUARY Programme Switching, Control, and Monitoring in Sound Broadcasting FEBRUARY BBC Engineer October, J.C.

Gallagher, J.B. Gray, G.D. Lean, H.A.S. Philippart, M.J. Mortimore, G.M. Le Couteur. * Editorial: Stereophonic Broadcasting in the United Kingdom * Principal Articles:U H F Relay Stations * Equipment for the Parallel Operation of Two kW High Frequency Transmitters * An Electronic Soft-focus Unit * Averaging the Frequency Deviations of Two F M Signals.

This book is the second in a new series, devoted entirely to the use of transistors. In the near future we will be publishing further books in this series dealing with audio amplifiers, transmitters, hearing aids, radio control, F.M.

receivers, television sets, sub -miniature radio sets, etc. All. A fault in the a.c. receiver may completely baffle the set owner, but if a know-ledge of how to set about a search for the trouble is had, the problems involved lose much of their difficulties.

A.C. receiver faults may divide themselves up into several groups, each group being subdivided. Every fault in the a.c. receiver can be accounted for.

Current Status: Introduction []. This book will eventually cover a large number of topics in the field of electrical communications. The reader will also require a knowledge of Time and Frequency Domain representations, which is covered in-depth in the Signals and Systems book.

This book will, by necessity, touch on a number of different areas of study, and as such is more than just a text for. with cheap sound receivers V.H.F./F.M. competes directly enough with long-wave/A.M.; the sound frequencies are really one market, and if compe-tition is justified on V.H.F.

there is no special reason to regulate that parti-cular broadcaster to whom the long wave happens to have been allocated.'.

V.H.F. - 30 Mhz to Mhz occupied by traditional T.V. stations, some amateur bands, commercial two way radio, maritime and aircraft bands as well as the F.M. radio band of 88 - Mhz. U.H.F. - Mhz to 3 Ghz this band is occupied by U.H.F.

T.V., some radar installations, mobile phones, two way radios and a heap of other stuff. A decision to introduce F.M.

radio on the U.H.F. band was quickly changed to V.H.F. after intense industry lobbying. 5UV in Adelaide was issued with the first community broadcasting licence in Australia.

2MBS in Sydney was issued with the first fulltime F.M. broadcasting licence in Australia. The increased high-frequency amplifica- tion before transmission is known as pre-empha- sis followed by de-emphasis in the receiver audio circuits.

F.M. broadcasting (maximum frequency deviation +75kHz) shows a greater subjective improvement than a.m., and it is estimated to be dB when the pre- and de-emphasis circuits have time-constants.Refinements to the sound broadcasting services, which have become possible and desirable as a means of improving the services, have been the introduction of the f.m.

v.h.f. service, the increased.Up for auction in CD-ROM format is a book entitled “ Radio Servicing Pocket Book ”, edited by J.P. Hawker (, pages). This book provides the essential information and data needed in the day-to-day work of servicing the whole range of modern A.M. and V.H.F./F.M., tube and transistor Rating: % positive.