P & H Electronics DI-1 Oscilloscope
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The Model DI-1 Oscilloscope
was specifically designed to
meet the needs of the single sideband enthusiast who uses an
accessory with his S.S.B. exciter, such as a linear
or transmitting Converter
. The DI-1
guesswork out of tuning and adjusting these Accessories
best linearity consistent with maximum, efficiency under
actual operating conditions regardless of voice characteristics.
It may also be used as a % modulation indicator for AM
transmitters or for carrier and sideband suppression
adjustments of single sideband exciters.
The trapezoid pattern display is used for most applications;
however, a 60 cycle sweep is provided for an envelope
display if It should be desired. '.’hen using the trapezoid
mode of application, the Oscilloscope
beam Is cut off when
no RF is present at the high level connectors of the
oscilloscope. This prevents burning a spot on the face of
the cathode ray tube during standby periods.
By studying the interconnecting diagrams you will be able to
select the method of application desired for your particular
Is a 3" Oscilloscope
supplied with a green Filter
and sealed bezel to provide a clean, clear display in an
average bright operating area. It is enclosed in a dark
grey, durable steel cabinet of modern styling with rubber
feet. The low and high voltage, hum-free Power supply
built In. Connections are provided at the rear of the scope
for all functions.
An accessory socket, below the chassis, accommodates a
, Model TT-1, when it is
required. The output from the two-tone Oscillator
connected to the exciter microphone Input connector. See
7ig. 3, Tags 7. The size of the vertical display Is
controlled by the 6-step vertical attenuator. Steps 1, 2, or
3 are used for higher powered transmitters while the
remaining steps provide increasing sensitivity for the lower
powered transmitters. The horizontal size knob controls the
gain of the horizontal Amplifier
which provides control over
the width of the display In either the trapezoid or envelope
The centering of the display is controlled by the vertical
and horizontal centering controls, while intensity and focus
provide the control over the brilliance and clarity of the
display. The AC power for the scope and the DC power for the
(when installed) are controlled by a
rotary switch. A pilot lamp, when lit, indicates that the
power is on.
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01 January 2017