Thetis Using P1 vs. P2 vs P2 @100MB

w3ub
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Thetis Using P1 vs. P2 vs P2 @100MB

Postby w3ub » Tue Oct 18, 2022 3:25 pm

Looking for some clarification. Using a later version of Thetis, such as 2.9.0.6 AND lower sample rates, such as 384K, one could use P1, or P2, or use P2 with the Ethernet protocol limited to 100 MB by holding the key input while powering up.

The reason for trying these different options is to avoid issues associated with the GB interface.

My question, is there some operational difference in Thetis, between all three options (P1, P2, P2 @ 100 MB). Assuming the sample rate is 384k or lower?

Maybe this belongs in another forum, but it involves FW and Thetis and the impact on Thetis.

Doug
K1LSB
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Re: Thetis Using P1 vs. P2 vs P2 @100MB

Postby K1LSB » Tue Oct 18, 2022 3:38 pm

What is "the GB interface"?

Mark
w3ub
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Re: Thetis Using P1 vs. P2 vs P2 @100MB

Postby w3ub » Tue Oct 18, 2022 3:47 pm

The GB Ethernet interface, which the FPGA/FW has a bit of a struggle with.
Doug
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Re: Thetis Using P1 vs. P2 vs P2 @100MB

Postby K1LSB » Tue Oct 18, 2022 4:09 pm

Ah, thanks.

Mark
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w-u-2-o
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Re: Thetis Using P1 vs. P2 vs P2 @100MB

Postby w-u-2-o » Tue Oct 18, 2022 4:11 pm

w3ub wrote:My question, is there some operational difference in Thetis, between all three options (P1, P2, P2 @ 100 MB). Assuming the sample rate is 384k or lower?
Between P1 and P2 there are very definite operational differences in Thetis. They are:

- Sample rates above 192KHz are not supported
- Stitched receivers are not supported

Between P2 GigE and P2 100Mbit there are no operational or functional differences in Thetis other than the user must provision bandwidth settings that are workable within the 100Mbit/s limit. Don't forget that PureSignal will instantiate a dedicated DDC and that bandwidth must be accounted for.

The usefulness of the P2 100Mbit/s mode is questionable. The required firmware is only available for the 7000 and 8000 units with the OrionMKII (not MKIII) and it was only made available as an experimental build.

AFIAK there is nobody with a 7000/8000/Andromeda that has not been able to find a P2 version that works for them at GigE speeds.
w3ub
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Joined: Fri Dec 14, 2018 6:32 pm
Location: Lunenburg, NS/Florida

Re: Thetis Using P1 vs. P2 vs P2 @100MB

Postby w3ub » Tue Oct 18, 2022 4:30 pm

Thanks, that was clear and concise.

Yes, most of us, myself included, can work at GigE speeds, but I find (and I think others as well) that we still get occasional irregularities. And most if not all of us have to try multiple versions of FW to get to this somewhat happy spot. Sequence errors, VAC occasional issues, PS occasional issues. It get worse if you try to add something like diversity.

Anyway, I just wanted to fully understand the options and limitations.

Doug
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w-u-2-o
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Re: Thetis Using P1 vs. P2 vs P2 @100MB

Postby w-u-2-o » Tue Oct 18, 2022 4:58 pm

All of those issues you mention, except for SEQ errors, are most likely not associated with GigE operation. Certainly VAC operation has nothing to do with GigE. And people have been having all of these issues since openHPSDR went mainstream with the Hermes boards and PowerSDR mRX.

As for SEQ errors, unless they are rampant they very rarely result in observable bad behavior.

It seems unlikely that "occassional irregularities" can all be blamed on GigE operation. However, if you have the right hardware available, you certainly can try the experimental builds to see if they solve the problems you have.

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