[time-nuts] New 10mhz Distribution Amplifier

Rick Karlquist richard at karlquist.com
Thu Aug 14 18:37:11 EDT 2008

Additional specs to consider:

The return loss should be low for 10 MHz and the first 8 harmonics.
The harmonic distortion should be low.
The isolation between outputs should be high.
The phase drift vs temperature should be low.
The short term stability at 1 second should be good.
The magnetic field susceptibility should be low.
Line sidebands should be low.

Compare, for example, the HP5087, a so-so design, to the
output amplifier design in the 5071A cesium, as documented
in my FCS paper in 1992.  Huge difference in specs.  The
5071A has 120 dB isolation between outputs.

Rick Karlquist N6RK

Bruce Griffiths wrote:
> Doug Millar wrote:
>> Hi,
>> 	A new 10mhz distribution amplifier is available at amateur prices.
>> Jerry N7EME is producing them. His website is at
>> http://jwmeng.com/model_RDA-6.html
>> 	Doug K6JEY
> There's  a few specifications missing:
> 1) input impedance and return loss.
> 2) output impedance and return loss
> 3) phase noise
> These are essential if one is to make a rational decision on the
> suitability of the distribution amplifier.
> The outputs and inputs appear to share a common ground.
> This would preclude its use in some setups without external means of
> providing the required isolation.
> The other question is does the device use AGC to set the output level?
> If it does the phase noise floor will almost inevitably be relatively
> high compared to the state of the art.
> Bruce
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