On 8/5/23 17:00, Reino Talarmo wrote:
Sent: sunnuntai 7. toukokuuta 2023 23.29
Why would i talk about non wsjtx usage on a wsjtx group ?
It is important to use commonly used words in the same meaning in the ham
community. There are many radio amateurs that have used other modes, some even
tens of years, before trying to operate WSJT-X modes. This discussion is a good
example of confusion, when suddenly a word is used to mean something else on
the working point of view. Split has meant since start of the amateur radio
using one frequency for transmission and another for reception for getting a
QSO especially on a pile-up situation. In a pile-up the DX operator has
difficulties to receive especially weaker stations. Of course the same applies
to any mode. FT8 is just a bit better that many classical mode due to special
decoding actions that are possible as very strong error correction and error
detection are used. In addition FT8 provides pan (skimmer) reception making
split working really comfortable!
The relevant issue in the split operation was different Rx and Tx frequencies
and that was made possible by use of two VFOs. Computers were used for QSO
logging and control of radios were made possible by CAT control to support
split working. Now WSJT-X started to use 'Split operation' to describe the
split control action, BUT used to compensate the split by changing audio. That
for sure caused confusion, including me in first. There should be a 'warning'
in the user guide, hi!
Well we all agree the Transceiver CP > VFO frequency & the modulating
audio frequency = the usb frequency transmitted and received by others.
Split, or Fake alters the radio TX CP frequency to force modulating
audio frequency within the best passband window 1500 - 2000 Hz. *
The audio is not best described compensating the split, but rather the
split/fake frequency shift compensating the good audio frequency
maintained to maintain the set TX marker point. I do not see why it is
confusing when you understand why it is done re *.
Anyone working 'split' DXpeditions surely should not have lost any of
that knowledge by using wsjtx splt-rig/fake operation to maintain a good
level/quality signal.
The manual should emphasize the reason & benefit to audio quality rather
getting hung up on the word 'split'.
The thing is with CAT control, it is done automatic by wsjtx, and the
operator can just concentrate on making contacts.
My earlier comments refute the claim that the green marker is a rx frequency,
when the program is receiving the whole pan bandwidth,
and the rx marker is just a decode filter separating that traffic from the rest,
such that there is no audio split when you are receiving at the same point that
your tx mark sits, regardless of where you place it on the pan.
Well, the pan is a good tool to describe the split working. Let's take a DX
station operating at 1600 Hz on the pan (green goalpost position) and there are
100 station trying to call it. If those stations use single frequency working
(non-split), then they don't need to use 'split operation' as there Tx (red
goalpost) is at 1600 Hz. Would the DX station decode all those 100 stations! If
wsjt-x manages to decode, say four of those, what is the probability that in
the next reception time-slot the same or at least the one he answered to will
be decoded?
I never claimed 100 stations on top of each other on same timeslot could
be decoded. The law of the jungle applies there, is why many use power.
The smart thing to do is use TX hold (where split/fake is a huge
advantage), and hangout on the less populated low section or high
section of the pan,
looking for a gap. I have TX shift enabled during TX and often hit gaps
on the fly with good success.
It is surprising how short that can be and still pass the info required
to contact
For the DX operator, he can obtain a cue of many operators that have
spread out on the pan all calling. I personally have worked pileups of
up to 30 calls in list,
one after another, and sometime altering between 2 -3 for better time
efficiency when one is lost for a couple of overs.
Now, if the 100 stations are using 'split working', then there is much higher
probability that the DX station will decode even most of those. He will select
one and his Rx frequency (the green goalpost) now moves to the point on the pan
and in the next reception timeslot the selected station at the Rx frequency is
decoded in a high probability. Of course you knew that already. BUT this is
what most hams mean by split working.
Your choice if you work the right pane, I have worked callers direct the
left during busy sessions and most wanted. I don't consider working
anyone within the pan, split working, for reasons mentioned before, as I
receive all of the pan. I am not contained by the green marker.
Of course most of the stations calling outside 1500 to 2000 Hz Tx points will
use also 'split operation'.
Not all do, this is where we see complaints of low level output and not
getting responses.
This confirms that this type of split is just for audio optimization, but it is
still a
radio split function, and not 'artificial'
I fully agree that, BUT the 'split operation' does not change your transmitted
frequency and none of the stations decoding your transmission will know or care
whether or not you are using 'split operation' as long as you signal is clean.
We agree on that, Many poor signals are a product of not using audio
optimization. Maybe if you title the program split/fake selects under or
within a 'Signal Optimize' Box,
then more would use it and understand better.
Thankyou Reino
73
vk4tux
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