On Mon, Aug 3, 2020 at 01:52 PM, DiSlord wrote:
Little more update v1.0.11
Check both variants v1.0.10 and v1.0.11
PS I didn't think I could get such a result
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DiSlord,
I also didn't think trustworthy measurements past 1200MHz were possible using the si5351 but two port measurements look good to 30dB down for both v1.0.10 and v1.0.11. The s21 noise floor is at least 40dB down to 1.5GHz using v1.0.10 on my H4. The s21 noise floor is at least 50dB down to 1.5GHz using v1.0.11 on my H4.
Both versions measured a 30 dB attenuator accurately to 1.5GHz. Previous version started to lose accuracy above 1.2GHz. Surprising the extra 10dB of headroom with v1.0.11 did not gain me anything when measuring a 40dB attenuator. Both versions were very noisy measuring a 40dB attenuator above 1200 MHz.
Comparison measurements of a 200 - 500MHz BPF and 300MHz LPF give the edge to version 1.0.11 (see attached screenshots).
I experienced lock-ups which required cycling power to the H4 using v1.0.11. The lock-ups occur randomly after the H4 has been operating for a while.
I'll try changing my threshold and see if the lock-ups still happen.
- Herb
