Internal pure signal & Sample rate > 19200 issue

[Kurt V.]

Hi all, 

it didn't caught my attention, but thetis v2.10.3.3 for HL2 can have a higher sample rate of 192000 up to  384000. Great stuff, so you can see the entire band. 

It works fine, but if I enable PS-A I get a scrambled tx audio. Am I the only one having this issue or is this a bug? 

Cheers & beers!

de ON7OFF

[G4ZAL]

It's a known issue and 192kHz has been recommended for Pure Signal since way back to PowerSDR days.

Nigel

G4ZAL

[Juergen Hussels]

In earlier versions of Thetis, Pure signal worked with 384k .

With the later versions not with auto sensing enabled anymore - but with single cal it works. Therefore you need to do the calibration once per band or section. Then you have a pure transmission even with 384k.

Some educated guys try to make network bandwidth responsible for this behavior with 384k. Not true at all. 

cheerio

Juergen DL4JY

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[DL1YCF]

>
> Some educated guys try to make network bandwidth responsible for this behavior with 384k. Not true at all.
>

PS with 384k *cannot* work with 100 MBit per sec. So if you are referring to
P1, then „some guys“ simply can calculate 1+1=2, which is true.

For P2 with 1 GBit/sec bandwidth, PS is no problem with 384k.

[Kurt V.]

If it is impossible to use Pure Signaling on 384k, why not program in Thetis that PS-A cannot be enabled? 

["Christoph v. Wüllen"]

Don't ask me, BUT....

... there are P1 radios (e.g. RedPitaya's) that can do 1GBit/sec because
the Ethernet adapter is controlled by standard hardware and not
by an FPGA.

For those radios PS with 384k is no problem. Most Ethernet adapters
except those directly attached to an FPGA are multi-speed today.

I guess it was just not worth for the Thetis people to actually determine
the Ethernet speed. For some hardware though, you know the speed.

And I think for those P1 gear that can do GBE, one should allow for
higher sample rates (because unfortunately the PS sample rate is
tied to the RX sample rate).

DL1YCF.

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[Steve Haynal]

Hi Christoph and Group,

The HL2 connects and transfers data at 1Gbit/sec, full duplex.

https://github.com/softerhardware/Hermes-Lite2/wiki/External-Connections#ethernet

Perhaps some people have issues because their home network is only 100Mb/s and the HL2 will autosense and connect at the maximum available speed. You can tell the connection speed of the HL2 by looking at the link speed LED as described in the wiki link above.

Right now as I sit and type this post, my HL2 is running the 10 receiver gateware. Each of these receivers is running at 192kHz. (We had 10RX 384kHz at one point.) This is impossible to do with a 100Mb/s connection, and demonstrates that the HL2 hardware supports more than enough bandwidth required for 384kHz PS.

73,

Steve

["Christoph v. Wüllen"]

For "normal SDR setup" there are 4 RX if PS is enabled,
this gives slightly less than 100 MBit/sec nominal
bandwidth and it works for me.

I can confirm that with piHPSDR I can successfully do PS with
the HL2 and 384k both with my Macintosh and with the Pi4
(I cannot do with ANAN-7000 running P1, which runs 5 RX
when doing PS).

With the P4 I see occasional "TX underruns" but this may have
a different reason, e.g. the limited horse power of the Pi4
I/O chip.

Perhaps this means that there is some other quirk in Thetis
(I do not know), unfortunately there are not so many people
running both programs since Thetis is Windows and piHPSDR
is MacOS/Linux, but if there are people around it
would be interesting to compare both programs with

HL2, 384k, PS

using the same network hardware etc.

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