Gary --
I'll repeat what I said before. I believe if you configure WSJT-X as
described in the User Guide and the referenced paper, its behavior will
be as it should be.
You have not said if you are using CAT control. If YES, and you choose
"Own Echo", you'll see your dial frequency change from Rx to Tx. On 6m,
Doppler shifts are small enough that you don't need to use CAT control.
In that case WSJT-X will do Echo-mode Doppler control in software, at
audio frequencies.
In either case, the echo peak in the Echo graph should be centered at 0.
SNR measurements are made only for a peak centered at 0. The "-99 dB"
you are seeing means that there is no peak centered at 0, and this means
something is not being done correctly.
-- Joe, K1JT
On 2/22/2023 12:05 PM, K9RX via wsjt-devel wrote:
Lance, Thanks – but the issue is that the operation and displayed
results – changed! It first was showing, on the Echo graph centered (0).
And at the same time it showed on the wide graph as the echo was where
it should be – i.e. 1596Hz for a 96Hz echo doppler shift. And it decoded
a signal with a level provided (-14.6, twice, w/ a Q of 10!).
But then later – w/o changing anything other than time (i.e. later)… the
echo showed on the Echo graph at -93 Hz (now the expected echo was 93
Hz)… the wide graph showed it just above 1500Hz and although there was
clearly an echo – the tabulated results remained at a level of -99.9!
This is all clear in the screen shot if anyone wants to see it.
After reading the doc I did see that it was set to “on own echo”. I
changed that to “none” and now it seems to work as expected – the echo
is now at 1576Hz on the wide graph and is at +76Hz on the Echo graph –
and it gave a proper numeric value (this time -20.3).
So again – its that it changed and when it changed it was no longer
functional as, even though the echo was clearly there, the value for SNR
was ‘stuck’ at -99.9.
Gary
Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for Windows
*From: *Lance Collister, W7GJ via wsjt-devel
<mailto:wsjt-devel@lists.sourceforge.net>
*Sent: *Wednesday, February 22, 2023 11:57 AM
*To: *K9RX via wsjt-devel <mailto:wsjt-devel@lists.sourceforge.net>
*Cc: *Lance Collister, W7GJ <mailto:w...@bigskyspaces.com>
*Subject: *Re: [wsjt-devel] Possible issue with ECHO mode - 2.6.0
Hi Gary,
I have not followed the ECHO mode documentation, but it may be that on
the Wide
Graph, you see the trace coming back as doppler shifed, but (at least in
previous
versions) the ECHO mode moves the frequency around, along with its
receiver, and just
displays the sum total of the average echoes received. The program knows
where it is
transmitting, so knows where to listen for the signal. I don't think you
need to pay
any attention to what is shown on the Wide Graph...GL and VY 73, Lance
On 2/22/2023 16:13:35, K9RX via wsjt-devel wrote:
>
> Thank you – I’ll look this over to see if it addresses the echo
appearing
> differently in both the wide and echo graph.
>
> Gary
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
Windows
>
> *From: *Charles Suckling via wsjt-devel
<mailto:wsjt-devel@lists.sourceforge.net>
> *Sent: *Wednesday, February 22, 2023 10:53 AM
> *To: *WSJT software development <mailto:wsjt-devel@lists.sourceforge.net>
> *Cc: *Charles Suckling <mailto:g3w...@gmail.com>
> *Subject: *Re: [wsjt-devel] Possible issue with ECHO mode - 2.6.0
>
> Hi Gary
>
> Have a look at these, which will hopefully help.
>
> https://wsjt.sourceforge.io/Echo_Mode_in_WSJT-X_2.6.0.pdf
>
> http://www.bobatkins.com/radio/EME_WSJTX_echo_mode_basic_guide.html
>
> 73
>
> Charlie DL3WDG
>
> On Wed, 22 Feb 2023 at 16:37, K9RX via wsjt-devel
> <wsjt-devel@lists.sourceforge.net> wrote:
>
> I like to use ECHO to test the station on 6M EME.
>
> But the latest version has changed enough I was wondering if
there was a short
> help file for it?
>
> Also: The Echo graph will at times show the echo centered – and
other times
> show it offset. I have a jpg showing a recent echo run where the
echo was very
> strong – and it was showing it as the right numeric doppler
shift, 96 Hz, but
> it was showing it on the graph as -96Hz and there was no SNR
value reported
> (-99.0 shown). You can see the echo on the wide graph – you can
see the echo on
> the echo graph – but both have it lower than it should be…
>
> A few minutes earlier I had 2 echos at -14.6 and others in to the
low 20’s –
> these were all showing on the spreadsheet – and “properly” on
both the wide and
> echo graphs.
>
> Gary Myers
>
> K9RX
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986>
for Windows
>
> _______________________________________________
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>
>
>
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--
Lance Collister, W7GJ(ex WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX,
3D2LR, 5W0GJ, E6M, TX5K, KH8/W7GJ, V6M, T8GJ, VK9CGJ, VK9XGJ, C21GJ,
CP1GJ, S79GJ, TX7MB, TO7GJ)
P.O. Box 73
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USA
TEL: (406) 626-5728
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URL: http://www.bigskyspaces.com/w7gj
Skype: lanceW7GJ
2m DXCC #11 - 6m DXCC #815 - FFMA #7
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