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In above chapter we mentioned MENU system. To edit all parameters, tables and functions, SMΩRF has
extensive, still easy to understand MENU system. MENU system has a tree structure always starting from the
root MAIN MENU, having separate branches for global settings - SYSTEM MENU, sensor related settings -
SENSOR 1, 2 MENU, alarms settings for each sensor - ALARM 1, 2 MENU and four (4) MENU items for each
SCREEN: TOP LED BAR, BOTTOM LED BAR, SCREEN MENU and TONE GENERATOR.
Push and hold for one second MENU button [11] to enter into root MAIN MENU tree. MENU system has auto-
exit, it means that to exit MENU you have to pass through any branch of the MENU tree by repeatedly briefly
pressing MENU button, until reaching the end of the given branch-chain and returning to the main SCREEN.
In BAR GRAPH SETTINGS chapter we have described TOP LED BAR MENU and BOTTOM LED BAR MENU.
Now we are going to take a look at last two MENU items coupled to the SCREEN, and it is TONE GENERATOR
and SCREEN MENU.
Tone generator can be considered as an independent instrument built-in the SMΩRF. It can be used
independently and simultaneously with other SMΩRF functions for many different measurements on transceiver
and power amplifier. Since Tone Generator is a part of the SCREEN, it remembers its settings for each SCREEN
separately.
Output can be set to generate single sine wave and two tone signal from 150Hz up to 10kHz in 1Hz resolution,
white and pink noise, and amplitude or frequency sweep. Generated output signal works in continuous or single
shot mode with adjustable time duration.
Transformer isolated output is compatible with both balanced and unbalanced microphone inputs, output level is
adjustable over 100dB range in peak-to-peak volts. Output jack contains also open collector PTT keying output,
always active when generator generates some signal. Audio PTT output has large, fixed 100ms lead time to
prevent any kind of hot switching.
Internally generator works on DDS principle in 32-bit precision, using 2
period of the sine waveform. Output is sent to the differential 24bit D/A converter clocked at 160ksps rate.
1.
OUTPUT
START/STOP choice enables or disables generator output. When generator is in the SINGLE shot
•
mode, output is automatically disabled when generation TIME expires.
SIGNAL
2.
SINGLE TONE generates single, sine wave tone of the frequency defined in FREQ.1 field and of
•
amplitude defined in LEVEL1 field.
DUAL TONE generates dual tone. FREQ.1 and LEVEL 1 fields defines frequency and amplitude of
•
the first tone, FREQ. 2 and LEVEL 2 fields defines frequency and amplitude of the second tone.
WHITE NOISE generates white noise signal of LEVEL 1 amplitude.
•
PINK NOISE generates pink noise signal of LEVEL 1 amplitude.
•
AMPLITUDE SWEEP generates amplitude sweep with linear or logarithmic response according to
•
the SCALE field definition and of frequency defined in FREQ. 1 field. Amplitude is swept from the
LEVEL 1 to the LEVEL 2, duration is defined in the TIME filed.
FREQUENCY SWEEP generates sweep in frequency with linear or logarithmic response according
•
to the SCALE field definition and of amplitude defined in LEVEL 1 field. Frequency is swept from the
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MENU SYSTEM - INTRODUCTION
TONE GENERATOR
TONE GENERATOR SETTINGS
14
long sample look-up table for quarter
16
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