Thank you for your interest. These are valid and technically relevant questions.
Grognon You advertise a phase noise of -115 dB at 1 Hz. This seems to correspond to the OCXO's specifications.
All components (power supply, buffers, relays, etc.) can have a significant impact on phase noise and spurious signals.
Grognon What are the actual values at the BNC connectors? Why don't you publish the measured values?
Regarding the –115 dBc/Hz @ 1 Hz Specification:
The –115 dBc/Hz @ 1 Hz figure refers to the reference performance level of the OCXO core oscillator we use. In high-end master clock products, it is standard industry practice to position and specify products based on the OCXO grade, rather than a single output-port measurement taken under a specific test condition.
In a real system, stages following the OCXO do have some influence on close-in phase noise. With proper design, this effect is typically well controlled and remains within approximately 1–2 dB, which is a predictable and widely accepted system-level result.
It should be noted that there is no single output phase-noise value that is independent of test conditions; results can vary with load, signal level, bandwidth, and measurement topology.
For this reason, we choose to state the OCXO's reference performance rather than publish a single output number that may not be generally comparable. In production, OCXO performance naturally varies, and we screen for stable units that perform better than the stated reference grade to ensure consistent system-level behavior.
Here is the output measurement result of a recently produced OCK-2P unit.
Of course, we really appreciate your suggestion, and for future products we plan to include parameters measured at the output as well.
Grognon You mention dual regulation, which was already the case for previous products. This isn't an improvement, but a marketing ploy: a dedicated power supply is required for the OCXO and another for the signal buffer.
Regarding the Power-Supply Architecture:
It should be clarified that both the OCK-2S and OCK-2P adopt a completely independent dual-channel power supply structure, serving the OCXO core and the output buffer stage separately. The upgrade focus of the OCK-2P is not on "whether it has dual-channel power," but rather on further optimization of the power supply path itself.
In the OCK-2S, the OCXO is powered by LT3042 low-noise regulators.
In the OCK-2P, on this basis, we added LM350T as a front-end pre-regulators, paired with an LT3041 ultra-low-noise regulators, forming a two-stage regulation structure.
The purpose of this design is to further reduce dynamic power impedance and improve isolation from upstream ripple and load variations. Since the OCXO is highly sensitive to power supply noise and impedance changes, this power supply architecture helps reduce the modulation effects of low-frequency noise on phase noise and long-term stability from an engineering perspective.
Grognon It's easy to advertise a value and tout the merits of a product. It's much harder to prove it.
Actually, for every OCK-2S and OCK-2P unit, we include a test report inside the package showing the phase noise performance of the built-in OCXO. This allows our customers to verify the OCXO's specifications directly.
