- Can be used
as:
- Measuring
Instrument without disciplined Oscillator,
for assessment of thermal, own short
therm and long term stability, for startup and switch-on characteristics
of oscillators up to 130MHz.
- Controled
loop for disciplined Oscillators,
for oscillators up to 130MHz.
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- Reference
sources:
- GPS : 1PPS-Pulse
- TV
: FBAS
- and other precise references based
on a 1 second pulse.
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- Principle
of work:
- Phase meter
between 2 pulses with a resolution
of 10ns.
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- Regulation:
- For high precise oscillators (HP10544,HP10811,Rb-standard,etc),till
home-brewed local oscillators (LOs) with reduced precision but
extended tuning range.
- Infinitely variable oscillator control
profiles with dynamic regulation characteristics.
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- Hardware
features:
- Digital part
with micro controller (8051 derivative),
indicating system, optional LC-Display (2*16 character) and control
elements (4 push buttons).
- Equipped with re-programmable FPGA's
.
- On board Sync. separator for FBAS TV
signal.
- Displays the current status of the
system on optional 2-line LCD.
- 4 push buttons for system setup, guided
by software on LCD.
- Status display and setup also possible
via PC link.
- Menu for reference source selection
GPS: 1PPS or other similar 1 second pulses.
TV : FBAS, on board I2C interface (including setup
software) for direct TV-tuner setup
for terrestrial and cable transmitter.
- Saving of all important setup and other
dynamic created values in EEPROM.
- Analog part
consist of a 20 bit DAC and a high
precision voltage reference with extremely low temperature coefficient.
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- Indicating
System:
- Synchronized phase meter injection
frequency using a PLL. (Error reduction better than 1*10exp-14).
- Synchronized phase meter.
- Self-contained fast synchronization
mechanism between the reference and oscillator for optimal adjustment
of the tuning range.
- Reference and oscillator frequency
(1PPS,FBAS etc.) supervisor as protection about drop-out and
absence.
- Poor signal recognizer can suppress
regulation and may try re-syncronization automatically.
- Setup to last DAC value in case of
start up after power fail.
- Power reserve if reference signal fails.
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- Processor
Software:
- Processor SW in system programmable
(ISP ,for maintaining and SW update).
- Self-contained recording of the oscillator
characteristic curve .
- Inverse characteristic curve recognizer.
- Status display of current values of
the regulation characteristics.
- Display of all automatically generated
settings for verification.
- System soft-start feature.
- System cold-start feature.
- System default setup.
- Selectable worm-up time after new start-up.
- Mostly all regulation characteristic
parameters can be chosen by the user to get an optimal alignment
for the used oscillator.
- Statistic function for signal quality
and two step failure counter.
- Diagnostic function for regulation
loop (100sec Loop).
- Software based rough and fine adjustment
for oscillators.
- Diagnostic and test function for analog
part.
- On-line calculation of the current
precision using linear regression.
- Recognition algorithm for short term
frequency deviation.
- RS232 connection to a PC or data logger
board. Any phase counter result and other important information
will be transmitted via RS232 second by second.
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- Data Logger
Board:
- Optional data logger board for collecting
data for statistics. Future version will have a connection to
a PR TNC for remote control.
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- PC Software
Tools:
- On-line analysis and
statistics using different methods.
- Off-line
analysis and statistics using
different methods.
- Up/Download
Tool for all relevant parameters of
the unit. Can display all values like the display at the LCD.Can
save, load and print everything for documentation, including
the frequency response characteristic curve.
- Download/Setup
Program for data logger board.
- GPS Satellite
Statistic Tool for GPS satellite availability.
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