W6WRT wrote:
> To the best of my knowledge, when it is enabled it
> is automatically enabled for both your TX and RX.
Sorry Bill, but that turns out not to be the case, at least for MMTTY.
The "UOS" button on the MMTTY main window affects only receive. It
simply treats received text as if there were a LTRS character after
every space. Overhead: none. It has no effect on transmitted text.
In the MMTTY Setup window under the TX tab, in the top centre "TX" pane,
the first check box is labelled "UOS". When this is checked, MMTTY will
send a FIGS character whenever a FIGS case character is to be sent
immediately following a space. Overhead: 1 extra FIGS character inserted
into every "<number><space><number>" combination. Incidentally, the
description of this TX UOS option in the MMTTY Help file is inaccurate;
it suggests that LTRS is also inserted into the transmit string between
a space and a letter, but a bit of experimenting demonstrates that this
is false - the only extra characters inserted by this option are FIGS
characters before numbers.
With respect to Phil's combinations, the state of USOS RX on the sending
station and USOS TX on the receiving station don't matter. The correct
table is:
Sending Station Receiving Station
USOS TX off USOS RX off
USOS TX off USOS RX on
USOS TX on USOS RX off
USOS TX on USOS RX on
The difficulty in deciding what to do about USOS rests mainly with the
TX side. The RX side costs nothing, you can turn it on and off in an
instant, and most software lets you see the other case more or less
easily. On TX, you have to make the decision as a setup decision; you
can't easily change it on the fly.
Since you can eliminate the extra character in the
"<number><space><number>" situation by changing that to
"<number><dash><number>", the best all-round option appears to be to
leave TX USOS on and adjust your macros accordingly, depending on the
balance you wish to achieve between speed and reliability. Between
numbers, dash is slightly faster but space is slightly more reliable in
most situations. Between letters, dash is considerably slower but only
slightly more reliable, and it's unnecessary if the receiving station is
using USOS.
If you want to cover all the bases, use TX USOS and try "599-123 123";
i.e., include a dash after the signal report, plus at least one space
elsewhere in the exchange string.
73,
Rich VE3KI
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