Hi Bill,
.
We should also take in account overlapping spectra as spreading information
between symbols under GFSK will affect decoding of the overlapped signals
mostly if we are using frequency criterion for candidate ranking and probably
due to the inaccurate signal subtraction, assuming all
/04/2019 13:01, Игорь Ч via wsjt-devel wrote:
> Hello Joe,
> .
> Is there any possible losses, e.g. sensitivity or compatibility, at
> pushing FT8 in software towards GFSK modulation?
> .
> 73,
> Igor UA3DJY
Hi Igor,
the simple answer is yes. But only related to compatibilit
Hello Joe,
.
Is there any possible losses, e.g. sensitivity or compatibility, at pushing FT8
in software towards GFSK modulation?
.
73,
Igor UA3DJY
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Hello Joe,
.
This behaviour is triggered by this code in the subroutine pack77_1:
.
if(index(w(1),'/P').ge.4 .or. index(w(2),'/P').ge.4) i3=2 !Type 2, with "/P"
...
if(index(w(1),'/P').ge.4 .or. index(w(1),'/R').ge.4) ipa=1
if(index(w(2),'/P').ge.4 .or. index(w(2),'/R').ge.4) ipb=1
.
Compоund
Hello Joe,
.
There is a bug in packjt77 module observed when first character of the base
call is 'P' in the compound callsign.
It can be seen in ft8apset.f90 code, where message with user's callsign
DU6/VA3AAA is packed as
'VA3AAA K9ABC RRR' and i3 equal to 1, while message with user's callsign
Hello Laurie,
.
DX cluster usage is an Internet dependant DX-ing and contesting, it is accepted
by community and organizers.
.
73 Igor UA3DJY
>Date: Mon, 10 Sep 2018 08:39:13 +1000
>From: "Laurie, VK3AMA" < _vk3a...@vkdxer.net >
>To: wsjt-devel@lists.sourceforge.net
>Subject: Re: [wsjt-devel]
Hello Robin,
.
That is correct, it also can be considered as moving costs of power amplifiers
and antenna systems to the server/software.
At the moment we have approximately 65k FT8 users and there should be simple
control layer protocol, costs may be similar to keeping pskreporter.info and
Hello Joe and all,
.
Most of questions raised on this subject can be solved via HLR/VLR database
server usage, where visitor location register can match to the specific HF band
where callsign, frequency, hash of the message being transmitted, protocol and
code rate can be stored, callsign hash
Hello Joe,
.
It was excellent example with the WSPR QSO, just thought we can get additional
FT8 gain if some messages at QSO will be transmitted as 'hash hash' / 'call
hash' / 'hash call' instead of callsigns.
.
Yes, there is a trade off between the sensitivity and protocol flexibility.
Hello Joe and all,
.
We all have been missing JT65 mode sensitivity and proposed WSJT-X 2.0 new FT8
approach with 0.2 dB sensitivity penalty can make things even worse.
.
I would like to ask you to consider a new protocol where callsign hash would be
used instead of the real callsign in all
Hello all,
.
Just a minor patch to prevent rare jt9 process crash in sync8.f90:
.
iz=ib-ia+1
call indexx(red(ia:ib),iz,indx)
--- ibase=indx(nint(0.40*iz)) - 1 + ia
+++ ibase=indx(max(1,nint(0.40*iz))) - 1 + ia ! max is workaround to prevent
indx getting out of bounds
.
73 Igor UA3DJY
Hello all,
.
It is either lack of code or just bad example in the documentation:
"QSOs involving Type 2 compound callsigns might look like either of the
following sequences:
CQ K1ABC/VE1 FN75"
where country is not being recognized properly for this callsign in WSJT-X
1.9-rc3:
.
102200 21 0.0
Hello Phil,
.
>Igor, the whole point of playing out silence is to maintain
>synchronization. If, for example, the sampling rate is 48 kHz and your
>RTP packets each contain 240 samples (5 milliseconds), then I would
>replace a single missing packet with 240 samples of binary zeroes. Your
>signal
Hello Phil,
>I implemented RTP in about a page of C code, not counting all of the
>UNIX/Linux system calls needed to set up multicast sockets. That's
>actually the only hard part. With RTP I just check that the next packet
>is in sequence, drop any old duplicates, and play out silence in place
>of
Hello Joe and all,
.
Multithreading FT8 decoder in WSJT-X can provide workaround to the latency
issues being observed at the DX-pedition mode tests.
.
Multithreading FT8 decoder is already implemented in JTDX and this approach
might be taken from the latest JTDX source code.
.
73 Igor UA3DJY
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