Hi Andreas,
We would not have imagined anyone would try to use Echo mode without
already having checked "Enable VHF and submode features". Obviously
that has been your problem, from the beginning.
-- 73, Joe, K1JT
On 8/4/2023 5:31 PM, Andreas Junge via wsjt-devel wrote:
Thank you Charlie DL3WDG, Bob KA1GT and Mike W9MDB for looking into the
code and putting your finger on it!
I can confirm that all 3 radios IC-705, IC-910H and the Flex6700 behave
the same now depending on the "VHF and sub mode features” setting.
VHF on = correct (fixed 1500 HZ)
VHF off = tone shift based on previous mode setting or wide graph click
And yes, the IC-705 profile was the only one that had it unchecked.
Great find! Mystery solved.
73, Andreas, N6NU
On Aug 4, 2023, at 2:24 AM, Reino Talarmo via wsjt-devel
<wsjt-devel@lists.sourceforge.net> wrote:
Hi Andreas,
It would be nice for you, if the echo mode had a ‘fail safe’ setting
that forces the transmission to 1500 Hz. The source code is available
and you may add that into the program. Otherwise the instructions are
clear how to use the echo mode.
73, Reino OH3mA
*From:*Andreas Junge via wsjt-devel
[mailto:wsjt-devel@lists.sourceforge.net
<mailto:wsjt-devel@lists.sourceforge.net>]
*Sent:*torstai 3. elokuuta 2023 22.16
*To:*WSJT software development <wsjt-devel@lists.sourceforge.net
<mailto:wsjt-devel@lists.sourceforge.net>>
*Cc:*Andreas Junge <andr...@n6nu.org <mailto:andr...@n6nu.org>>
*Subject:*Re: [wsjt-devel] #Echo Echo shifts TX frequency when
clicking "Set RX & TX offset" - should be disabled
Joe,
Yes, I have read it. I also read Bob's (KA1GT) article. Please have a
look at this short recorded screen session:
https://icecreamapps.com/v/fkkg3dt <https://icecreamapps.com/v/fkkg3dt>
Either right-clicking into the wide graph and setting the offset -
which should not work since it should be fixed to 1500- or by
previously being in Q65 with an offset will cause this.
It follows the pattern of @0-500 offset will subtract 1500Hz,
@501-1000 will subtract 1000Hz, @1001-1500 will subtract 500Hz and so
on until +1500Hz
I think this feature is used to keep the tones in the middle of the TX
passband, but it also requires a frequency shift of the generated tone
which does not happen because it's set to a fixed 1500Hz.
In short, yes, there should not be a frequency shift on TX in the
first place and that is a bug IMHO.
I enabled logging for the rig transactions and the radio is indeed
commanded to go to the wrong offset on VFO B it should be 144065000.
rig_set_split_freq called vfo=VFOB, curr_vfo=VFOA,
tx_freq=144064000
It works fine when I right click on 1500Hz in the wide graphs or when
1500 was selected in the previous mode.
73, Andreas, N6NU
On Thu, Aug 3, 2023 at 11:45 AM Joe Taylor via wsjt-devel
<wsjt-devel@lists.sourceforge.net
<mailto:wsjt-devel@lists.sourceforge.net>> wrote:
Hi Andreas,
Have you read the full-length paper about Echo mode in WSJT-X 2.6.0 and
later? See item #34 in the list of WSJT-related references here:
https://wsjt.sourceforge.io/refs.html
<https://wsjt.sourceforge.io/refs.html>.
As described there, in Echo mode the transmitted audio-frequency tone
should always be 1500 Hz.
-- 73, Joe, K1JT
On 8/2/2023 10:47 AM, Andreas Junge via wsjt-devel wrote:
> I posted my initial question on thegroups.io
<http://groups.io/>list as well, but Charlie, DL3WDG suggested to
post it here as well.
>
> This is reproducible. In Echo Mode right click in the Wide Graph
and select “Set RX & TX Offset” it seems to change the TX.
>
> Steps:
> - In the radio settings set "Split Mode" to Radio or Fake (No
difference)
> - Select "Echo Mode"
> - Select 23 cm -> 1296.065 (Default)
> - Select Doppler Tracking mode to "Own Echo"
> - Display shows 1296.065 +/- My Doppler
> - Enable TX
> - The frequency will initially show 1296.06500 and the immediately
change to 1296.064500
> - On RX the frequency goes back to the correct 1296.06500 +/- Doppler
> - The Echoes will be shown at the @1000 offset and not @1500, which
is expected, but wrong.
>
> After a few tries I found that selecting “Set RX & TX Offset” in
the Wide Graph
>
> If I click on @1000 I get 64.5000, @1500 65.0000, @2000 65.5000
>
> The audio should be fixed at @1500 and the Set RX & TX feature
should be ignored.
>
> I think this if half of the feature that keeps the audio in the
sweet spot of the bandpass? However, it does not do the necessary 2nd
step of shifting the audio to adjust for it.
>
> 73, Andreas, N6NU
>
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