Amplifier distortion

140 Pages·2015·12.38 MB·English

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JANUARY 1977 35p
Morse keyboard
Amplifier distortion
0
Australia SA
Canada 31.5
Denmark Kr. 1.00
Finland Fmk ..2D
Germany Dr. 4.50
Greece Dr. 4- OC
Holland DO 5C
Italy L. 900
Malaysia M 1.2E
New Zealanc NS1 40
Norway Kr. t 01111c1 mum:
Portugal Esc O'C
SSpoauitnh APtlarisc a8 )' O1C 13
Sweden Kr. C tfm ;I. moms
W S A. Si 50
10MHz-.51OMHz AM /FM SIGNAL GENERATOR TF 2015
M >RCON1 INSTRUMENTS LTD
mt TF
2015
a wider view
of signal generation...
The TF 2015 is a versatile 10 -520 MHz signal generator with frequency and the synchronizer will finish the job for
calibrated a.m. and f.m. and an accuracy of output level you. Now you can change the frequency by up to 2%
setting normally found only in instruments costing three using the decade dials without touching the generator -
times as much. A special system gives very fast tuning and all to an accuracy of 2 parts in 107. It stays locked
across the bands yet provides smooth control within the all day and doesn't degrade any aspect of the
narrowest of passbands. Leakage radiation is carefully generator performance.
screened out to enable accurate measurements to be made I.F. Probes
even at levels below I µV. These are an invaluable aid to the testing of receivers
Matched Synchronizer with squelch or battery economiser circuits.
The clip -on Synchronizer TF 2171 transforms the These circuits are inactivated when the crystal -
performance of TF 2015 into the equivalent of a controlled signal from the probes is brought into
synthesizer at less than half the comparable cost. the proximity of the receiver's i.f. strip. This
The frequency is locked to crystal stability and makes it easy to tune the generator to a receiver
can be dialled in 100 Hz. steps. Tuning is quick when its channel frequency is unknown. The
and easy - set the decade dials, switch to "lock" probes can also be used to check exact tuning by
and tune the generator to the approximate adjusting for zero beat.
THE SIGNAL GENERATORS
-
MARCONI INSTRUMENTS LIMITED
Longacres, St. Albans, Hertfordshire, England, AL4 OJN Telephone: St. Albans 59292. Telex: 23350.
A GEC -Marconi Electronics company.
WW -001 FOR FURTHER DETAILS
Wireless World, January 1977
LEVELL LOW COST
OSCILLATORS
PORTABLE INSTRUMENTS
WO C. QiA1AVJR iW[ Mltt ,
FREQUENCY 1 Hz to 1 MHz in 12 semi -decade
ranges. 0 to % fine control
1
included on TG200DMP.
ACCURACY +2 % +0.03Hz.
SINE OUTPUT 7V r.m.s. down to <200uV with Rs
=600S2.
DISTORTION <0.1% to 5V, <0.2% at 7V from
10Hz to 100kHz.
SQUARE OUTPUT TG200D, DM & DMP only. 7V peak
down to <200#. Rise time
< 50nS.
1
SYNC. OUTPUT >1V r.m.s sine in phase with
output.
SYNC. INPUT t- 1% freq. lock range per volt r.m.s.
METER SCALES TG200M, DM & DMP only. 0 /2V,
0 /7V & -14/ + 6dBm.
SIZE & WEIGHT 260mm x 130mm x 180mm.
4.3kg.
TG200 TG200D TG200M TG200DM TG200DMP
£69 £73 £84 £88 £92
FREQUENCY 3Hz to 300kHz in 5 decade ranges.
FREQUENCY 0.2Hz to .22MHz on four decade
1
controls. ACCURACY ±2% t0.1 Hz up to 100kHz,
ACCURACY + 0.02Hz below 6Hz. increasing to ±3 °/i at 300kHz.
±0.3% from 6Hz to 100kHz.
± 13%% farboomv e 13000k0H kzH tzo. 300 kHz. SDIINSET OORUTTIOPNU T <20.5.V2 %r.m f.rso. md o5w0n Htzo to< 25000kpH.Vz..
SINE OUTPUT 5V r.m.s. down to 30uV with Rs= 60052. SQUARE OUTPUT 2.5V peak down to <200uV.
DISTORTION <0.1 5% from 5Hz to 5kHz.
<0.5% at .5H1z and 51 0kHz. SYNC. OUTPUT 2.5V r.m.s. sine.
METER SCALES 2 Expanded 1 voltage &-1 2/ +4dBm. METER SCALES 0/2.5V &- 10/ +10dB on TG152DM.
SIZE & WEIGHT 260mm x 190mm x 180mm. 5.6kg. SIZE & WEIGHT 260mm x 130mm x 180mm. 3.4kg.
TG66B TG66A TG152D TG152DM
Battery £180 Mains & £195 Without £55 £69
model battery model meter Wmeitthe r
LEVELL ELECTRONICS LTD.
Prices include batteries and U.K. delivery. VAT extra. Optional
Moxon Street, High Barnet, Herts. EN5 5SD extras are leather cases and mains power units. Send for data
Tel. [phone] 8686 covering our range of portable instruments.
WW -005 FOR FURTHER DETAILS
2 Wireless World, January 1977
We'04440,
The world over - For high quality electronic valves,
semiconductors and integrated
- -
circuits and the speediest service
You get the
specify Haltron. It's the first choice of
Governments and many other users
best service throughout the world. Haltron product
quality and reliability are clearly
confirmed. The product range is very,
from Haltron very wide. And Haltron export
expertise will surely meet your
requirements. Wherever you are, get
the best service. From Haltron.
Hall Electric Limited,
Electron House,
Haltron
Cray Avenue, St. Mary Cray,
Orpington, Kent BR5 3QJ.
Telephone: Orpington 27099
Telex: 896141
WW -032 FOR FURTHER DETAILS
Wireless World, January 1977
Our Dome Tweeters have reached
the pinnacle of success...
KK 7 DOME TWEETER
The latest addition to the range. For use in
systems up to 40 watts RMS and available in both
4 and 8 ohm versions.
KK 8 DOME TWEETER KK IO DOME TWEETER
Two models are available, suitable for Similar to the KK 8 but with narrower
use with systems up to 50 watts or sound dispersion angle. Available in both
alternatively, 80 watts. 4 or 8 ohm models 50 watt and 80 watt versions, with
can be supplied. 4 or 8 ohms impedance.
Isophon have been manufacturing loudspeaker For further information on these dome tweeters and
drive units for over 50 years and regard their other loudspeaker drive units manufactured by
dstoomriee st.w Leoeutdesrsp eaas koenr em oaf ntuhfeaicrt ubriegrgse sint scuocucnestrsi es IHseAphYonD, EcNom LplAetBe OthRe AcTouOpoRn IEanSd LpIoMstI TtoE D, e
throughout the world now incorporate one of Hayden House, Churchfield Road,
the above dome tweeters in their system Chalfont St. Peter, Bucks, SL9 9EW.
designs. Tel: Gerrards Cross (02813) 88447 I
I
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WW -043 FOR FURTHER DETAILS
4 Wireless World, January 1977
Why scrap good
mono cameras?
Wireless World, January 1977 5
making
EEVis still
image orthicons.
Why change equipment which has many more years
of useful life ahead?
EEV is still making image orthicons in very large
numbers. And we're constantly developing them with
improved performance.
So you can be sure of continuity of supply of high
-
quality and tubes.
3" 41"
Our prices are competitive. Our service backup
is worldwide. All the knowhow and skill of 24 years
production goes into every EEV image orthicon.
-
Our tubes are all you need to keep
on getting good pictures, colour or
black and white, from older
generation cameras.
Write for data and
prices. If you have a specific
requirement, contact your
local EEV agent or call
Camera Tube Sales at
Chelmsford, England.
EEVand M know how
Members of GEC- turnover £1902 million
S6C
ENGLISH ELECTRIC VALVE CO LTD, Chelmsford, Essex, England CM1 20U Tel: [phone]. Telex: 99103 Grams: Enelectico Chelmsford.
WW -006 FOR FURTHER DETAILS
Not a win on the pools, a trip to
a Pacific paradise, or a reduction
in income tax, but distortionless
"'current dumping ".
Z's to 4 are the four passive
1
components which interconnect the
current dumpers, (the output
transistors which supply the
power), to the small high quality
amplifier which provides the
error signal, so that when the
above condition is met the
current in the load, the loud-
speaker, is independent of the
current in the dumpers and hence
distortion is solely dependent
on the quality of the error
amplifier, which because it is
small can be very good.
Wonderful indeed.
For further details on current
dumping and other Quad products
write to Dept. WW
The Acoustical Manufacturing Co..
Ltd., Huntingdon, Cambs.,
PE18 7DB Telephone [phone]
"Something wonderful *
happens when Z1Z3'
Z2Z4
*
Elektor ElectFor::ics
Magazine No. 8. Dec 1975
QUAD
for the closest approach to the original sound
for twenty- five years
QUAD is a Registered Trade Mark
WW -007 FOR FURTHER DETAILS
Wireless World, January 1977
is enough!
once
Perfect reproduction stems from creating
a perfect system and then
recreating the memory contents exactly.
A plaster cast makes a fairly good replica
of an original, but it is far from perfect.
To improve the replica, you must improve the cast.
It is the only way.
At Otari, it is our fundamental policy to plan on
the basis of creating extremely accurate, MX-5050-2S MX-7308
highly precise data recorders and duplicators.
Only by concentrating in this way on the heart of
the duplicating process can we provide product which
fill the professional's need for the most perfect
reproduction of live sound that is possible.
Trust through experience- one encounter
with OTARI equipment and from then on,
You will trust the OTARI name.
fiA RQ,
OTARI CORPORATION: 981 Industrial Road, San Carlos, California 94070, U.S.A. Phone: California 415.593 -1648 Telex No. 259103764890 OTARICORP SCLS
OTARI ELECTRIC CO., LTD. 4- 29.18, Minami Ogikubo, Suginami.ku, Tokyo, 167 Japan Phone: [phone] Cable: OTARIDENKI TOKYO Telex: J26604 OTRDENKI
WW -075 FOR FURTHER DETAILS
8 Wireless World, January 1977
ANALYZER
CE-15 SPECTRUM
-
REFERENCE LE-V EL 0 d B
------
___-____._--
-10
,
-20
PROBE PWR
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-30
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-40
FOCUS FREO CAL Ih
-50
PIC!
ANALYSER
Fo
CENTER FREQUENCY
TUNING
SCAN WIDTH
cQARSE
rNE
AM /FM m
Easy to ope
Low cost
New from Dana is the Cushman CE -15 spectrum analyser, with a total range of 1 MHz to 1 GHz.
Portable 12 -volt operation is offered as an option, making it a valuable tool in radio service work.
Interlocked controls ensure simplicity of operation, and levels from +20 dBm to -115 dBm can be
measured directly from the display, which has a range of 70 dB.
Measuring only 240 by 220 by 470 mm, the CE -15 takes up little bench space and, weighing in at
13.6 kg, is easily carried. How have you managed (so far) without one?
n
Makers of High -quality Instruments Frequency Counters
:
Digital Voltmeters
Dana Electronics Ltd., Waveform Generators
Collingdon Street, Communications Test Equipment
Luton, Beds. Telex 82430 Microwave Counters
Others measure by us. :
Telephone [phone] Frequency Synthesizers
:
WW -063 FOR FURTHER DETAILS