Function
The Ekco E199 Mark II Signal
Generator is designed for pulse and
CW work in the range 25 to 70 Mc/s
and is a necessary tool for aligning
and testing radar IF and AFC
systems. Facilities include internal
square wave modulation, external
pulse gating and crystal calibration.
General description
There are three frequency bands,
changed by plug-in coils. The piston
attenuator, which has coarse and
fine controls, has an exceptionally
high reading accuracy.
Internal modulation
In addition to CW operation a selector
switch provides alternatives of
superposition of 5 Mc/s calibration
pips or 1000 c/s square wave
modulation.
External modulation
The generator may be modulated by
negative pulses of 10 volts minimum
amplitude. The 10% to 90% rise
and fall times of these modulating
pulses will be preserved to better
than 0.1 µsec. in the gated RF
envelope. For pulse lengths up to
10 µsec. the pulse output level will
be within ±0.25 dB of the CW output
at the same attenuator setting.
Calibration checks
A built-in crystal oscillator provides
a frequency calibration check at
5 Mc/s intervals up to 70 Mc/s.
