The pictures below are of a Hallicrafters BC-610
I transmitter. The BC-610 radio transmitter is a medium power
r-f transmitter which will transmit am or cw signals over a range of
more than 100 miles. The frequency range of the transmitter
is 2 to 18 mc. The BC-610 transmitter is controlled by the master
oscillator or the crystal oscillator, depending upon the position of
the M.O.-XTAL switch on the tuning unit. At frequencies below 8 mc,
the power output of the transmitter exceeds 400 watts on cw, and 300 watts
on voice or modulated continuous waves. The BC-610 will operate with
input power of 1,700 to 2,000 watts from a 115-volt, 50-to 60-cycle ac source.
The BC-610 radio transmitter also may be used for
transmitting RTT signals on a frequency shift basis. For this
type of operation, an external r-f exciter unit is used instead
of the oscillator section of the transmitter. Signals from the
exiter unit are connected to the oscillator section through the crystal
socket of the transmitter tuning units. The exiter unit shifts
the frequency of the transmitter r-f output in accordance with the
teletypewriter signal input to the exciter unit.
The BC-610 radio transmitter assembly is made up
of three chassis. The top chassis is referred to as the r-f
deck and includes all of the r-f components. The center section
is called the modulator deck since it contains most of the audio and
modulator equipment. The bottom chassis includes the h-v power
supply and overload relay; it is called the power supply deck. The
three chassis are assembled in a sheet steel cabinet with a front panel
upon which the external controls and metering instruments are mounted.
The cabinet is bolted to a shock-mounted base. The weight is
approximately 400 pounds.
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