Attrezzatura informazioni:

Central Electronics 200V Trasmettitore
Produttore:
Central Electronics
Modello: 200V
Data: 1961
Categoria: Radio Comunicazione
Gruppo: Trasmettitore
Descrizione: Broadband Exciter Transmitter
Informazioni:
                                    BROADBAND CIRCUITRY

Thanks to exclusive CENTRAL ELECTRONICS broadband circuitry,
load im:x»drtnces of 52-72 ohms for coaxial cable are
inherently matched without the need of tunin? or loading
controls. Power output is essentially constant across each band.

FREQUENCY COVERAGE
80 Meters — 3.G to 4.5 MC.

40 Meters —6.5 to 7.5 MC.

20 Meters- 1S.5 to 14.5 MC.

15 Meters. 20.5 to 21.5 MC.

10 Meter* — 27.7 to 29.7 MC.

PLUS- A spare position to permit factory installation of
broadband coils for 1.75 to 2 IC. 2 to 2.5 MC., or any 1
MC. portion of the spectrum between

2.5	and 25.5 MC. not already covered by amateur banda» For
example: 2.5 to 3.5 MC. 1.5 t.. MC-

5.5	to 6.5 MC. etc. (Note that these portions must l>etfin
and end at .5 MC. points only) OR: the 2 MC. portion 25.0 to
27.6 MC. not covered by the 10 meter band position (at
additional cost).

NOTE the generous overlap bevond the amateur bands, for
MARS, CAP or COMMERCIAL applications. Ever beyond that, the
VFO has 50 KC of overtravel (100 KC. above 25.6 MC.) at each
end of the scales. Calibration accuracy and linearity of
this overtravel ts not guaranteed put ¡t*K there in case you
need it.
SIX OPERATING MODES

LSIJ Lower sideband suppressed carrier.

USB Upper sideband suppressed carrier.

AM Double sideband with pre-set carrier.

PM Phase modulation with pre-set carrier.

CW Four methods of keying with pre-set carrier. FSK
Frequency-shift teletype with pre-set carrier and adjustable
deviation.

Power input 200 watts PEP on SSB; 100 watts on AM; 175 watts
on PM. CW and FSK.

TELEVISION INTERFERENCE: Conventional AM equipment utilizes
Class C amplifiers that distort the RF output waveform,
causing seven! harmonic TVL Since the output stage in the
200V operates in Class AB1 in all modes of transmission,
excellent linearity and extremely low harmonic output is
obtained.

transmitter in which the Sideband signal h generated at a
fixed crystal controlled frequency and thereafter
heterodyned to different band». This feature eliminates the
necessity of rebalancing the wideband generator when
changing from band to band. In the 200V a NEW DOUBLE
HETERODYNE system insurer extreme stability. The VFO lanes
from 6 to G MC, Sideband generation is crystal controlled at
8 MC. All Heterodyne oscillators run continuously, are
crystal controlled and temperature compensated for high
¿lability. Blocked m id keying of mixers and linear
amplifier result* in essentially click less chirp free
break-in operation.

INVERSE AUDIO LIMITER

Audio clipping allows an increase in the level of the weaker
speech passages giving your signal that extra "punch'*
required for increased readability under adverse conditions
It maintains maximum speech level and prevents overloading
of the balanced modulator, mixer* and RK amplifier stages.
In the past, most clipping systems have contributed
objectionable distortion to the output signal. In the 200V a
new circuit utilises the clipped waves as inverse feedback
to cancel an appreciable amount of distortion. We have
called this improved clipper the “Inverse Limiter". In
combination with the new 200V Audio Filter, this
revolutionary system allows 10 I)B. of limiting with minimum
effect on the speech quality. With about 3 DB. of speech
limiting the front panel Limiter Indicator begins to flash.
The amount of limiting may be determined by t he 6 I)B.
calibrations of the Spcech Level control. No matter how loud
you talk into the microphone or how far you turn up the
Speech control, the peaks will not increase beyond
approximately 1 DB above the pre-set level.

PERFECTED AUDIO FILTER

The 200V filter is composed entirely of RC elements, yet has
the steep aide response and rejection characteristic* of a
toroid filter. Since it is a degenerative RC bandpass
(200-3800 cycles) type, it overcomes the harsh, ringing
characteristics of conventional filters. It precedes the
phase-shift network and will maintain 50 DB. unwanted
sideband suppression even beyond the bandpass limits of the
new PS-2 phase shift network.

PHASE SHIFT NETWORK

The new PS-2 is a ten element type unit constructed of heat
cycled component-» matched to .1% accuracy. In combination
with its associated circuitry and the fact that DB. of
inverse feedback is applied around the modulator, it will
maintain 50 DB. unwanted sideband suppression. This novel
approach means that even the modulator tubes may be changed
WITHOUT AFFECTING SIDEBAND SUPPRESSION. The RK phaseshift
network is a new non» critical, low impedance, wide band
type having extreme stability.

POWER OUTPUT CONTROL

In the 20*)V the power output may be adjusted to any level
between 10 watts and full output. This new circuit
eliminates the need for power consuming dissipative networks
when driving linear amplifiers with lower drive
requirements. The power output control does not affect the
output load impedance
of 52-72 ohms A matching network will lie required for
grounded grid amplifiers having an input impedance above 100
ohms.

POWER OUTPUT TUBES

The broadband output circuit of the 200V uses a pair of 6550
tubes that are rated for continuous commercial service in
ultra-linear UiFi applications. Our tests, have shown that
the linearity of 6650's is far superior to that of the
commonly used 6146’s at the power output level of 100 watts
PLUS. Plate dissipation is H5 watts per tube and a pair will
deliver OVER 100 WATTS of single tone power, even on ten
meters, without griil current flow! Two tone third order
distortion products are down in excess of 40 DB.

NEW POWER SUPPLY

Conventional rectifier tubes have been replaced in the 200V
with SILICON RECTIFIERS. The result is considerably ¿ess
heat and higher voltage output. The new power supply has
extremely good regulation even under the higher input levels
.used in the 200V output stage.

2" MONITORING SCOPE

Gives an instantaneous visual trapefeoid check on
non-linearity or flat-topping resulting from improper
loading. Also indicates correct setting of pre-set carrier
level control for 100^ AM modulation.

LOAD MIS-MATCH PROTECTION

In the event that an improper load causes excessive screen
current in the power amplifier, an overcurrent relay in the
200V applies protective bias and flashes the front panel
MISMATCH neon indicator.

METER

The illuminated meter indicates final amplifier DC power
input on a 0-200 watt scale.

SET AND FORGET CONTROLS

Behind the two magnetic doors on the front panel are all the
seldom used controls which are normally adjusted when first
putting the 200V on the air. They include: Speech Level: VOX
trip level; Antitrip (QT) level: VOX release time: KSK
deviation; carrier null; pre-set AM carrier and DSB switch:
pre-set CW earner; CW monitor level; VFO-XTAL switch and
Power output control.

OTHER OPERATING CONTROLS

CALIBRATE LEVEL: Adjusts strength of calibrate signal to
suit band conditions or individual installations.

FUNCTION SWITCH: Power Off; Standby; VOX; Voice calibrate;
Carrier calibrate; PIT; and Manual. BAND SWITCH: Selects 80,
40, 20, 15, 10 and X position for special frequencies.

EMISSION SWITCH: Selects LSB, USB, AM <DSB>, PM, CW or FSK.

NEW MIXER CIRCUITRY

New FRAME GIUI) tulies (6EH7-6FJ7) are used in the new 200V.
They have extremely high gain, run cool and their use
assures that unwanted mixer products are down in excess of
50 DB.

Questi manuali sono disponibili per l'attrezzatura di cui sopra:

Central Electronics -- 200V -- Servizio e manuale utente
Nome file: CentralElectronics-9110-Manual-Page-1-Picture
Tipo manuale: Servizio e manuale utente
Pagine: 79
Dimensioni: 4.76 Mbytes (4995013 Bytes)
Lingua: Inglese
Revisione:
Manual-ID/Number:
Data: 24 febbraio 1961
Qualità: Documento scansionato, la lettura in parte male, non in parte leggibile.
Data di caricamento:
MD5: 86bf08fef09fed490b5f95c44180ba1d
Download: 13 dal 09 luglio 2017
Informazioni:
INDEX	1,1A,1B,1C,1D

Warranty

Claim for Damage In Shipment Shipping Instructions

FACTORY TECHNICAL ASSISTANCE
SECTION I - GENERAL DESCRIPTION	2

Seven Types of Emission	2

Power Output - Plus or Minus 1 db.	2

Onjt.y One Tuning Control - the VFO	3

Built-in Precision Linear VFO	3

Double Heterodyne Circuit	3

Frequency Coverags	4

Only Pour Operating Controls	4

Emission Selector (Six Position)	5

Set and Forget Controls	5

Mismatch Indicator	5

Limiter Indicator	5

Two Inch Monitoring Oscilloscope	6

Advanced Phasing SSB Generator	6

Mater	6

Zaro Setting (Fiduciary Dial Scale)	7

SECTION II - INSTALLATION	0

Unpacking	8

Power Source	8

Physical Location	8

Microphone	9

Antenna	9

Illustration: Receiver Connection

Diagram	P 257

Illustration: Antenna Relay

Connections	P 255

Illustration: Using the 200V with a

Drake Phone Patch	P 258
SECTION IV - REAR CONNECTIONS	13

Antenna Receptacle	13 To Anc, Rly* 11b VAC 25 Watts Socket 13

Internal Relay Socket	13

PTT MIC Jack	13

Phone Jack	l5S

CW - MAN - VOX Jack	13

CW Stby. Jack	13

CW PTT Jaok	13

Rocolver Output Socket	14

Speaker VjCc Socket	14

MIC Connector	14

Bias Jack	14

FSK-1 Jack	14

FSK-2 Jack	14

VFO IN Jack	14

VFO OUT Jack	14

AF OUT Jack	14

Fuse	14

Illustration: 200V Rear Chassis

C cnne o t ions	p2 65

Illustration: 200V Top-View	P253

SECTION V - OPERATION	15

1.	Single Sideband Suppressed

Carrier Adjustment	15

2.	Amplitude Modulation Adjustment	16

3.	PM and CW Carrier Adjustment	16

Illustration: 200V Oscilloscope

Pattsrns	P259 Illustration: 200V Oscilloscope

Patterns	P260

SECTION VI - TELEVISION INTERFERENCE	17

OPERATING NOTES	19

1.	Flat-Topping	19

2.	Reducing Low Frequency Response

in the Speech Amplifier	19

3.	FSK. Deviation	19

4.	Undesirable Relay Operation Caused

by Emission Switch	19

5.	Calibration Signal Weak	20

6.	CW-FSK Monitoring with Earphones	20

7.	Using a Key in the CW-MAN-VOX Jack 20

SECTION IV - REAR CONNECTIONS	13

Antenna Receptacle	13 To Anc, Rly* 11b VAC 25 Watts Socket 13

Internal Relay Socket	13

PTT MIC Jack	13

Phone Jack	l5S

CW - MAN - VOX Jack	13

CW Stby. Jack	13

CW PTT Jaok	13

Rocolver Output Socket	14

Speaker VjCc Socket	14

MIC Connector	14

Bias Jack	14

FSK-1 Jack	14

FSK-2 Jack	14

VFO IN Jack	14

VFO OUT Jack	14

AF OUT Jack	14

Fuse	14

Illustration: 200V Rear Chassis

C cnne o t ions	p2 65

Illustration: 200V Top-View	P253

SECTION V - OPERATION	15

1.	Single Sideband Suppressed

Carrier Adjustment	15

2.	Amplitude Modulation Adjustment	16

3.	PM and CW Carrier Adjustment	16

Illustration: 200V Oscilloscope

Pattsrns	P259 Illustration: 200V Oscilloscope

Patterns	P260

SECTION VI - TELEVISION INTERFERENCE	17

OPERATING NOTES	19

1.	Flat-Topping	19

2.	Reducing Low Frequency Response

in the Speech Amplifier	19

3.	FSK. Deviation	19

4.	Undesirable Relay Operation Caused

by Emission Switch	19

5.	Calibration Signal Weak	20

6.	CW-FSK Monitoring with Earphones	20

7.	Using a Key in the CW-MAN-VOX Jack 20
SECTION VII - THEORY OP OPERATION	21

Power Supply	21

Microphone Preamplifier	21

Plug-In Audio Limiter Module	21

Plug-In Audio Filter Module	22

Vox Amplifier and Vox Rectifier	23

QT Amplifier and QT Rectifier	23

Relay Control	23

Audio Phase Inverter	24 PS-2 Differential Audio Phase Shift

Network	24

AF Amplifier and Modulator	24

Interpreting Switch Drawings	25

Emission Switch Circuits	25

LSB Position	26

USB Position	26

AM Position	26

PM Position	26

CW Position	26

FSK Position	27

Function Switch	27

Off Position	27

Stby Position	27

VOX Position	27

Voice Calibrate	28

Carrier Calibrate	28

PTT Position	28

Manual Position	28

Balanced Modulator	29 8 MC Crystal Oscillator and

Reactance Tube	29

8 MD RF Phase Shift Circuits	29

VFO	30

VFO Buffer-Doubler	30

High Frequency Crystal Oscillator	31

First Mixer	31

Second Mixer	32

RF Driver	32

RF Power Anqpllfier	33

Neutralizing the Power Amplifier	33

8 MC Amplifier	34

Horizontal Amplifier	34

2 Inch Monitoring Oscilloscope	34

Calibrate Level Circuit	35

Illustration: Simplified Schematic of

VOX and QT Circuits	P263 Illustration: Simplified Blocking

Bias. Operating Bias and

Caliorate Circuits	P271

Illustration: 200V VOX Relay	P256

Illustration: 200V Block Diagram	P251

Tube Compliment	36

SECTION VIII - MAINTENANCE AND REPAIR	37

Low Level Broadband RP Circuits	37 Removing the Plug-In
Audio Limiter,

Plug-In Audio ?liter, or Relay

Cover	37

Removing the PS-2	37

Fan Motor Maintenance	37 Replacing Defective Sections In the

Bandswitch	38

Removing the VFO	38

VFO Recalibration	39 Determining the proper Crystal for

Crystal Controlled Operation	40

Conversion Crystal Frequencies	41

VFO Lubrioation	41 Cathode Ray Tube Static Charge

Distortion	41

Sideband Suppression Adjustment	42 Sideband Suppression
Adjustment

ïïithout the Use of a Soope	43

Illustration: 200V Sideband

Alignment	P264

Adjusting the Mixer Potentiometers 44

Illustration: 200V Limiter Battery

îfe. intens nee	P254

Illustration: Xtal Oscillator

Plate Coil Chart	P270

Illustration: 2nd Mixer Coll Chart P273 Illustration: Driver
Coil Chart P272 Illustration: Physical Correlation between
the 200V and the 200V Wiring Diagram	P268

Illustration: Resistor Board on

Low Level RF Chassis	P269
CentralElectronics-9110-Manual-Page-1-Picture
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Central Electronics -- 200V -- Scheda tecnica
Nome file: CentralElectronics-9111-Manual-Page-1-Picture
Tipo manuale: Scheda tecnica
Pagine: 4
Dimensioni: 678.40 Kbytes (694686 Bytes)
Lingua: Inglese
Revisione:
Manual-ID/Number:
Data: 01 marzo 1961
Qualità: Documento scansionato, tutto leggibile.
Data di caricamento:
MD5: c8a90fc62ced3be2c919e46e774c7863
Download: 10 dal 09 luglio 2017
Informazioni:
CentralElectronics-9111-Manual-Page-1-Picture
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Central Electronics -- 200V -- Manuale di servizio
Nome file: CentralElectronics-9112-Manual-Page-1-Picture
Tipo manuale: Manuale di servizio
Pagine: 9
Dimensioni: 1.01 Mbytes (1059147 Bytes)
Lingua: Inglese
Revisione:
Manual-ID/Number:
Data:
Qualità: Documento scansionato, la lettura in parte male, non in parte leggibile.
Data di caricamento:
MD5: c89cc0e2ca041a79d5f4dafa407bad7b
Download: 15 dal 09 luglio 2017
Informazioni:
Aligment Instructions and General Service Information
CentralElectronics-9112-Manual-Page-1-Picture
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