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.
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
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
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
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
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
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
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.
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