[time-nuts] Symmetricom 5115

Bob Camp lists at rtty.us
Wed Apr 7 20:14:41 EDT 2010


Hi

So basically what I get when I buy a 5115 is a limited frequency range box that isn't quite as good as (as in 40 db worse than floor) an HP 3048. Of course I'd need to buy a cheap synthesizer to go with the 3048 if I wanted to do the "any frequency" stuff at the 5115 level. 

Bob


On Apr 7, 2010, at 7:04 PM, John Ackermann N8UR wrote:

> I just took a look at the datasheets for the 5115, 5120, and 5125.  .
> 
> The 5115 is the "base" model covering through 30 MHz and without a cross-correlation capability.  At 10 MHz input frequency, its spec is -133 dBc/Hz at 1 Hz offset, and -147 dBc/Hz at >100 Hz offset (not spec'd at greater offsets, so presumably that's the floor).
> 
> The 5120 adds correlation to lower the noise floor.  At 10 MHz input frequency, it is spec'd at <-145 dBc/Hz at 1 Hz, and <-175 dBc/Hz at 10 kHz.
> 
> The 5125 extends the 5120 frequency range to 400 MHz.  At 10 MHz its "typical" performance is -145 dBc/Hz at 1 Hz offset and -170 dBc/Hz at 10 kHz (specified performance is about 5 dB worse; the other two datasheets only specify spec, not typical).  The floor increases with frequency, with the close-in noise going up more rapidly than the floor further out.
> 
> All three are spec'd at 1 dB accuracy, and can measure at offsets down to 1 milliHertz.  One thing that's nice about the TSC boxes compared to traditional PN measurement systems is that the reference doesn't need to be at the same frequency as the DUT.
> 
> John
> ----
> 
> Jeffrey Pawlan said the following on 04/07/2010 05:52 PM:
>> Dear Nicholas,
>> Thank you for getting this discussion back to technical aspects related our real quest for technical information.
>> Please look in your actual documentation for the current model 5125 and confirm its actual specs. I had read some specs on the Symmetricom website but I do not know for which model. Although automated and easy to use, I remember that the phase noise floor was lackluster and makes me think that this may be fine for very close-in measurments but not for the usual 100Hz to 100KHz offset measurments. Please let us know what you find with this equipment.
>> Regards,
>> Jeffrey Pawlan
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