The SSG520 is a very easy to use synthesizer with an output
range of 10— 520MHz and provides full signal generator
facilities. The r.f. performance is very good with
particularly low leakage levels enabling accurate output
level settings to be obtained and the high stability
synthesized operation gives precise clean output frequencies.
The output is available via a type N connector and is
selectable as a single range with a bank of seven easily
read thumbwheel switches. These switches enable the output
frequency, to be dialled or reset to a resolution of 100Hz
very quickly. They may be set in any order at any time and
with any frequency step from the smallest (100Hz) to the
largest (10 to 520MHz).
Once set the switches act as the generator memory and ensure
the instrument will always return to this frequency, without
subsequent attention after a power interruption.
LE.D. lamps provide information regarding the validity of
the output frequency. One illuminates when the synthesizer
has locked at the requested frequency and another
illuminates if an output higher than 520MHz or lower than
10MHz is dialled.
The output level controls are comprehensive with two rotary
switches giving a total attenuation range of 119dB in 1dB
steps. Dual output scales are provided giving simultaneous
indications of voltage pd and dBm (both 50ω). In addition an
output meter gives continuous indication of the presence of
r.f. output. The meter, in conjunction with an r.f. fine
level control enables the main output attenuator to be
calibrated and also gives output level control between the
1dB attenuator steps.
Full modulation facilities are available with four ranges of
f.m. and one of a.m. The a.m. and f.m. controls are
completely independent allowing them to be set at any level
from either the internal two frequency oscillator or an
external signal. An internal oscillator output is also provided.
The modulation is monitored by a meter and function select
switch. This meter indicates the amount of modulation
whether it is derived from internal or external sources.
A very useful additional feature is the inclusion of a 1kHz
automatic distortion meter. This allows the measurement of
receiver SI NAD ratios. (The ratio of signal plus noise plus
distortion to noise plus distortion). The receiver audio
output is automatically level sensed and the 1kHz
fundamental removed. The meter then displays the SI NAD
ratio in dB. No frequency or level tuning is required.
If the remote programme option is fitted then all major
functions can be controlled via a multipin socket. These
include, frequency, attenuation, modulation and SI NAD meter.