|
Introduction
The DA1-100-10 is an ultra low noise distribution
amplifier for synchronizing electronic equipment to a
common frequency reference. Typically, the
reference will be 5 MHz or 10 MHz from a primary
frequency reference, such as a cesium standard, or a
secondary frequency reference, such as a rubidium
oscillator.
However, the DA1-100-10 can work at any frequency from 1
MHz to over 100 MHz or be band limited to just one
frequency, such as 5 or 10 MHz.
Ultra Low Phase Noise
It's very important that a distribution amplifier does
not add noise to the frequency reference. The
DA1-100-10 has close in phase noise of -133 dBc/Hz at a
1 Hz offset and a -168 dBc/Hz noise floor (optionally
to -172 dBc/.Hz). This close in phase noise is 20
dB better than most frequency references, even ultra low
noise ones. Thus the DA1-100-10 won't interfere or add
any noise to the input signal.
A plot of typically DA1-100-10 phase noise is shown
below. The blue line is the specification, but the black
line is actuall measured phase noise.
Number of Outputs
The DA1-100-10 can have 5, 10, 15 or 20 outputs in a 1U
case. Each channel's output level can be
independently set to any level from 0 to over 13 dBm.
This is very useful when connected equipment has
different input level requirements.
Channel Isolation
Another important characteristic of a distribution
amplifier is that the reference oscillator must be well
protected from load mismatches on the outputs.
Also one channel mustn't affect another.
The DA1-100-10 has 90 dB of channel to channel isolation
and 130 dB of reverse isolation thereby fully protecting
the oscillator.
Automatic Gain Control
A unique feature of the DA1-100-10 series is the
inclusion of an AGC circuit. Normally, AGC circuits
can increase the units phase noise. But the
DA1-100-10's AGC has been carefully designed not to do
this. The benefit of AGC is that any input
variations or AM noise on the reference oscillator are
removed, and the output signal remains at a constant
level.
Alarm Monitoring
Every output on the DA1-100-10 is independently
monitored by the alarm detection circuitry. Any
output that fails will raise an alarm.
Many Options Available
There are many options available for the DA1-100-10
series, and if your requirement doesn't exist, we'll
make it especially for you.
Options include:
-
Redundancy, whereby two units operate as a pair.
If one unit should fail, the second unit takes over.
-
Sinewave or squarewave outputs.
-
Multiplied or divided outputs. E.g. 5 MHz
input, 10 MHz output.
-
High output levels, up to +20 dBm.
-
Different gain versions, so input levels from -20
dBm to +20 dBm can be tolerated.
-
External DC back-up power input. Automatic
switchover from AC to DC.
|
DA1-100-10 SPECIFICATIONS |
|
Specification Parameter |
Specification |
Comments |
|
Frequency |
1 MHz to 100 MHz |
Wideband Frequency Input |
|
Bandwidth (2 MHz - 100 MHz) |
± 1.5 dB (typically ± 1 dB) |
(±3 dB from 1 to 150 MHz) |
|
Impedance |
50 Ω |
Other impedances available |
|
Input VSWR |
< 1.50 |
Slave output terminated in 50 Ω |
|
Input Level |
+7 dBm to + 20 dBm |
AGC Controlled. Optional -10 to +30 dBm |
|
Sinewave Outputs |
|
Output Waveform |
Sinewave |
50 Ω BNC Connector on rear panel |
|
Output Frequency |
Exactly the same as the input |
|
|
Output VSWR |
< 1.15: 1 @ 10 MHz |
|
|
Output level (individually adjustable) |
Adjustable 0 dBm to > +10 dBm |
0 dBm to +13 dBm with > +10 dBm input |
|
Output Level Stability |
< 0.05 dB / °C |
Typically < 0.02 dB / °C |
|
Harmonic Distortion (10 dBm input) |
-25 dBc |
Typically -35 dBc @ 10 MHz |
|
Spurious Outputs (> 500 kHz) |
-125 dBc |
Typical |
|
Channel to Channel Isolation |
> 90 dB @ 10 MHz. |
> 60 dB @ 100 MHz |
|
Input to Output Isolation |
> 130 dB @10 MHz |
> 105 dB @ 100 MHz |
|
Delay match between outputs |
< 2.5 ns (<500 ps / 5) |
< 500 ps within group of 5 outputs |
|
Temperature Stability of delay |
10 ps/°C |
Typically 5 ps/°C |
|
Slave Output |
|
Slave Output |
Passive output derived from input |
Level = input level - 7 dB. |
|
Allan Variance |
|
Allan Variance |
< 5 x 10-14 (1 sec) |
Calculated from phase noise |
|
Phase Noise |
|
Phase Noise (dBc/Hz) |
-134 / -148 / -157 / -165 / -167
/ -167 |
1 /10 / 100 /1k /10k/100k Hz offsets |
|
General |
|
Power (AC) |
100 - 240 VAC (usable 90 - 260) |
50 Watts max |
|
Size and weight |
483 x 300 x 44 mm and 2.8 kg |
Width x Depth x Height |
|
Ambient Operating Temperature |
-10°C
to +40
°C |
|
|
Alarm Output |
Alarm Outputs on rear panel |
|
|
Options (not all options can be fitted at the
same time) |
| |
|
|
|
Option 01 |
Dual changeover alarm relay |
Activated in the event of an alarm |
|
Option 02A |
Ground Isolated Input |
|
|
Option 02B |
Ground Isolated Outputs |
|
|
Option 03 |
Redundancy |
Requires two units |
|
Option 04 and 05 |
Different connectors |
TNC, SMA etc. |
|
Option 08 |
Increased output level |
Customer to state his requirements |
|
Option 09 / 09B / 09C |
Additional 5 / 10 / 15 sinewave outputs |
|
|
Option 10 |
Squarewave outputs |
TTL/CMOS or ECL output levels |
|
Option 11 |
Divided frequency output |
E.g. 2.048 MHz, 1MHz, 5 MHz, 1 pps etc. |
|
Option 12 |
Multiplied output |
E.g. X2, X5, X10, X100. |
|
Option 13 |
Low Pass filter on output |
Improved harmonic rejection |
|
Option 14 |
External 12VDC input |
Operates from 12.0 to 15.0 VDC |
|
Option 16-XXX |
Internal backup oscillator |
XXX = frequency in MHz. |
|
Option 17-XXX |
Different Gain Levels |
Customer to advise gain requirement |
|
Option 19 |
Second External Input |
Automatic switchover if 1st input is
lost |
|
Option 20 |
Two reference inputs |
With two sets of five outputs |
|
.jpg)
