Rosendahl nanoclocks GL Manuale utente
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Instruction Manual
nanoclocks GL
nanoclocks GL is a digital audio genlock masterclock with
12 word clock / AES11 DARS outputs and
2 reference inputs for SD video syncs, HD tri-level syncs,
AES11 or word clock signals.
www.rosendahl-studiotechnik.com
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Contents
1. Unpacking and Mounting into a 19" Rack page 4
2. Connection to Power Supply page 5
3. Installation & Connection Status page 6
4. System Settings page 7
5. Reference page 8
6. Sample Rate page 11
7. Output Mode page 11
8. Setup Utility page 12
9. Declaration of Conformity page 13
10. Specifications page 14
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1. Unpacking and Mounting into a 19" Rack
nanoclocks GL comes with the following accessories:
1 pcs IEC 60320/C14 power cable
1 pcs USB cable
2 pcs 1U rack mount brackets, mounted
1 pcs user manual that you are now reading
The unit is shipped with four small plastic feet mounted underside
with Philips screws.
If you want to rack mount your nanoclocks GL please detach the four
plastic feet.
For desktop use please detach the rack mount brackets using a
metrical hex-wrench.
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2. Connection to Power Supply
Attention! Before connecting to mains please check the voltage
selector on the left side panel.
Disconnect from mains before switching. Make sure the 115 / 230V
setting matches to your local mains voltage.
Use 230 VAC setting in the UK, EU.
Use 115 VAC setting in the US, Japan.
nanoclocks GL can also be powered by a 12 volt DC supply using
the 4-pin XLR connector, pin 1 is Ground (-) and pin 4 is Vcc (+) 12V.
The power button lights up green when the unit is powered by mains
and changes to red when the power source is DC.
If the DC supply drops below 10,6 Volts the red power LED starts
blinking.
Primary power source is always mains.
Feed mains and DC supply simultaneously to power the unit from
two redundant sources. When one of the sources fails the unit will
keep working without disruption.
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3. Installation & Connection Status
If you require no more than the 12 word clock/ AES11 outputs
provided by the nanoclocks GL feed each digital audio unit with a
separate clock line.
Use 75 ohm coaxial (RG59) cables with standard BNC connectors
for word clock or AES11 lines.
It does NOT matter if the cables are 2, 5 or 10 metres long.
Comment: To shift the phase of a word clock signal significantly, you
would require a cable of some kilometers.
Even a 50m cable will work without loss of quality within a facility
with proper grounding.
More important than the cable length are equal ground potentials at
the source and the receiver.
Similarly to analogue audio signals producing "hum" affected by
different ground potentials, digital transmission lines can be
worsened/ modulated by ground loops. Good studio grounding is
essential, not only for word clock signals.
To isolate ground potentials galvanically and for interfacing coaxial to
balanced AES11 lines (XLR 3-pin) we recommend Neutrik Digital
Audio Impedance Transformers NADITBNC-F / NADITBNC-M.
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Correct termination is quite important to avoid cable reflections,
especially for the higher frequency AES11 signals.
The nanoclocks GL is monitoring the connection status on each
output and displays the present state of termination.
(1) Press the STATUS key.
(2) buttons 1..12 for outputs 1..12 will display:
off: output is open or not terminated, > 85Ω
green: output is in use and terminated with 75Ω
red: output is double/ low terminated, < 50Ω
4. System Settings
Each of the three system buttons SETUP, SAVE and "on/off" must
be pressed and hold for three seconds to enter setup mode, save the
current settings or to enter power down mode.
If you press these buttons shortly or unwittingly, there will be no
action.
In SAVE mode you can still use STATUS or MODE buttons to select
the desired display mode.
For all other settings you must enter SETUP mode first:
Press and hold the SETUP button for 3 seconds.
Press and hold the SAVE button for three seconds to store new
settings to nanoclocks GL non-volatile memory.
Press and hold "on/off" key for three seconds to enter power down
mode. All clock outputs will be muted.
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5. Reference
REFERENCE = INTERNAL:
Press the INT. button to set the nanoclocks to its internal,
temperature-compensated timebase accurate to 0.2 ppm (parts per
million).
INPUT buttons are set inactive and the sample rate buttons enter a
blinking mode during the calibration process.
After a few seconds the sample rate buttons will light up continuously
to indicate LOCKED operation.
REFERENCE = VIDEO:
Press the VIDEO button to configure nanoclocks GL for video-
genlocked operation.
Both reference inputs A and B accept SD video syncs as well as HD
tri-level sync signals (1080p, 1080i, 720p).
Frame rates 23.98, 24, 25, 29.97, 30, 59.94 and 60 fps are detected
automatically and the INPUT buttons light up continuously when a
valid sync signal is present.
When no valid sync signal applies the INPUT buttons start blinking.
Nanoclocks GL will synchronise its audio clocks as soon as a valid
video input signal is detected and the sample rate buttons will start
blinking.
As soon as synchronisation is stable, the sample rate buttons will
light up continuously, indicating LOCKED to video syncs status.
You can select manually INPUT A or INPUT B by pressing the
according button.
AUTO mode automatically switches to valid inputs, where input A is
primary/ preferred.
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Switching from INPUT A to INPUT B does not produce deviations on
the synchronised audio clocks, stable operation will be obtained.
All lock and relock procedures are operated very smoothly to
guarantee continuous audio clock output signals during all stages:
lock, hold, relock.
If the video frame rate is a multiple of the sample rate, it is possible
to lock the audio phase to video syncs.
Then the rising edge of the word clock signal will be phase locked to
the start of video line 1.
Several nanoclocks GL units locked to the same video house sync
will produce phase locked audio clocks.
REFERENCE = AUDIO
Press the AUDIO button to configure nanoclocks GL for audio
genlocked operation.
Both reference inputs A and B accept word clock as well as AES11
reference clock signals.
If no valid audio clock signal is present the according INPUT button
is blinking.
Audio reference signals with
44.056, 44.100, 47.952, 48.000, 88.112, 88.200, 95.904, 96.000 kHz
are detected automatically and the output sample rate will be set up
accordingly.
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The lock range of the nanoclocks audio crystal oscillators is +/- 50
ppm, which allows synchronisation to even strongly distuned audio
clock references.
Sample rate buttons light up continuously when the unit is LOCKED
to the selected audio reference input signal.
REFERENCE = DISTRIBUTION AMPLIFIER
Press the DIST. AMP button to switch to distribution amplifier mode.
The internal audio clock generators will be switched off and the input
signals from INPUT A or INPUT B will be routed directly to all 12
outputs. No reclocking/ output formatting will be performed.
When a word clock signal is detected, all outputs will be switched to
word clock output mode, when an AES11 signal is found, all outputs
will be switched to AES output mode.
In distribution amplifier mode it is not possible to configure/ change
the output mode manually.
The sample rate buttons are set to inactive, but still serve to display
the sample rate detected on the active INPUT.
VARI displays non-standard sample rates, i.e. 50 kHz.
INPUT A and INPUT B buttons are blinking if no valid audio clock
signal (word clock or AES11) is found.
AUTO mode automatically switches between valid inputs, but does
not perform a seamless switchover as in AUDIO mode. The signal is
not reclocked and must be absent for 40ms before a switchover is
executed.
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