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phase noise analyzer and phase noise measurement

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KE5FX:
That sounds like a conservative approach, assuming that (1) you use a very low loop BW to lock the 100 MHz OCXO with the ADF4002 and that (2) you use two of them.  Spend a lot of time in ADISimPLL to make sure you are happy with the loop response, as ADF4002s aren't super quiet in-band.  You need both downconverter channels to run at the same frequency for the TimePod's benefit, and that's a good idea in any case, but you want them to behave independently at the Fourier offsets of interest.

As noted above, there is likely to be no need for an exotic reference source at the end of the chain (meaning, at the TimePod REF IN jack).  If you can find an HF OCXO with a white-noise floor near -170, that would probably be fine.

drew23:
Hi.

The OCXO reference for each local oscillator is also the reference for the analyser. I thought this would reduce the number of noise sources by two.

In the downconverter, I think the main source of noise is the VCO in the PLL which is maybe 20 dBc/Hz worse than the OCXO. However, the two downconveters are not correlated and much of the noise is removed by cross-correlation.

The local oscillator references I have are 10 MHz, just on what was available. The local oscillator signal generators are only about US$160. I am not aware of any other microwave signal generator that is locked to an OCXO at anywhere near the price.

The cost of the whole microwave phase noise measurement system is about US$1000, an order of magnitude cheaper than anything else and within the budget of an amateur like me.

Regards Drew VK4ZXI

hpw:

--- Quote from: drew23 on February 23, 2024, 01:49:54 am ---The local oscillator references I have are 10 MHz, just on what was available. The local oscillator signal generators are only about US$160. I am not aware of any other microwave signal generator that is locked to an OCXO at anywhere near the price.

The cost of the whole microwave phase noise measurement system is about US$1000, an order of magnitude cheaper than anything else and within the budget of an amateur like me.

--- End quote ---

As I wrote, I like to have a Turn Key solution (as finished with may different performance options) and NOT a DIY project more. As looks OXCO, mixer/splitter and any other parts to purchase.

This means, install the required SW & connect the HW and press the measurements at the SW. As getting what the seller promises. Nothing less or more.

Hp

drew23:
Hi HP

The only phase noise analyser that is completely self-contained for GHz measurements is the R&S FSPN. They cost upwards of US$100k depending on top frequency.

Even the FSPN provides for external references and has low-noise power supplies for external amplifiers, depending on the measurement.

The other phase noise analysers are similar to the PN2060C, requiring external oscillators, mixers, amplifiers and power supplies. The other analysers are around US$10k, whereas the PN2060C is US$780.

Regards Drew VK4ZXI

https://qsl.net/bg6khc/pn2060c_phase_noise_analyzer.htm

tautech:

--- Quote from: drew23 on February 27, 2024, 04:45:29 am ---Hi HP

The only phase noise analyser that is completely self-contained for GHz measurements is the R&S FSPN. They cost upwards of US$100k depending on top frequency.

--- End quote ---
SSA5000A models with PN option provide for this too starting under $20k.
https://int.siglent.com/products-overview/ssa5000a/
Latest App note:
https://int.siglent.com/resource-detail/65/

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