Hi Glenn,
Searching the User Guide for a keyword is often a helpful way to find a
section of interest, but it's hardly a substitute for actually reading
the Guide. The second and third paragraphs of the whole Guide introduce
each of the supported protocols and provide a few words about what it's
designed for. Here's what is said about FST4:
"FST4 is designed especially for the LF and MF bands."
For what it's worth: I note that the "CTRL-F" search that you mentioned
does take you directly to Table 7 in Section 17.2 -- the summary I drew
to your particular attention.
-- 73, Joe, K1JT
On 12/7/2023 5:41 PM, Glenn Williams via wsjt-devel wrote:
Thanks for the guidance.
So I'll take the hit for overlooking FST4 and FST4W for the needed low
S/N. I jumped to conclusions too quickly. I do that too
often in life. This happened after operating FT8 since 2021. My
oversight is due to the following reliance on a method of quickly
scanning for the assumed discussion early in the User Guide.
I started from the top of the User Guide PDF file and did a CTRL-F
("find") for "S/N". The third "Find" hit on "S/N" occurs in
Section 7.1 of the User Guide. The fourth hit on "S/N" occurs in
17.2.10. Between those two points, and in "1. Introduction" no
tabulation of S/N advantages occurs, when S/N is such a key value for
all WSJT-X modes. Albeit, discussions do occur about
weak-signal conditions on LF, HF, and VHF between those two points in
the Guide, but "how weak" is not as often emphasized.
--73, Glenn, AF8C
On 12/7/2023 2:55 PM, Reino Talarmo via wsjt-devel wrote:
Hello Glenn,
I think that you wish is already heard and fulfilled.
The suitable mode is FST4. There are seven modes with
transmission periods from 15 to 1800 seconds. The
performance of the FST4-120 is about the same as for
WSPR. For longer transmission periods transmitter
frequency stability requirement is higher as the used
bandwidth goes down. See user guide 17.2.10. Summary. Of
course the (un)stability of the propagation path on 160m
band may prevent usage of the slowest modes.
73, Reino OH3mA
-----Original Message-----
From: Glenn Williams via wsjt-devel [mailto:wsjt-
de...@lists.sourceforge.net]
Sent: Thursday, December 7, 2023 5:46 PM
To: wsjt-devel@lists.sourceforge.net
Cc: Glenn Williams <a...@alumni.caltech.edu>
Subject: [wsjt-devel] 160m S/N needs advanced mode
Hello,
FT8 on 160m pales.
WSJT-X operators customarily running FT8 and FT4 on
80m through 10m HF bands are likely disappointed with
trials on 160m. As one of those operators I recently
ran
WSPR on 160m in comparison to working FT8 QSOs on
160m. In NA EST daytime operation at 2220Z WSPR
faultlessly listed a
-28 dBm decode.
Here I suggest we need an improved decode sensitivity
for 160m QSOs, likely needing to be done with a new
mode. Granted, the TX and RX times would have to be
increased (Shannon-Hartley Theorem). That would
require additional operator patience and associated
protocols for the extended timing.
--73, Glenn, AF8C
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