The directions are missing the phrase "if your rig is capable of it". Kind of
assumes everybody understands this stuff.
Bandwidth settings are on of the big variables on rigs and have generally
gotten wider as the years have gone on.
So...if your FT-100 cannot widen bandwidth you are stuck with what you have.
But, either Fake It or Rig Split settings will allow you to work whatever you
can see as long as your bandwidth covers 1500-2000Hz.
de Mike W9MDB
On Sunday, October 28, 2018, 8:35:25 AM CDT, Marco Calistri via wsjt-devel
<wsjt-devel@lists.sourceforge.net> wrote:
Il 27/10/18 21:58, Bill Somerville ha scritto:
On 28/10/2018 01:30, Morris Wideman via wsjt-devel wrote:
My MP does not put out full power but if you have a way to increase the TX
audio level such as mic gain then this is not that big a problem.
Morris,
this is a very bad idea. Increasing the audio drive to compensate for the SSB
IF filter attenuating the Tx signal will almost certainly overload the
modulator input. This is particularly poor practice if you do this to
compensate for a low frequency audio tone as the resulting audio harmonics will
pass through the SSB IF filter unattenuated leaving you with a filthy Tx
signal.
The correct way to deal with Tx audio frequencies outside of the Tx SSB IF
filter passband is to either restrict your operation to Tx audio offsets to
above 1500 Hz (to keep any audio harmonics outside of the passband) and to
below ~2400 Hz, alternatively if you have CAT control you should enable
"Settings->Radio->Split Operating" and let WSJT-X do the right thing
automatically; then there are no restrictions on the Tx audio offset you may
use.
Incidentally, this is one of the reasons that using the rig's ALC indication
to estimate the correct audio drive is missing the point and may result in poor
Tx signals.
73
Bill
G4WJS.
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Hi Bill,
I have some doubts here regarding the WSJT-X TX audio settings, because my
radio is a very modest and not so modern YAESU FT-100 and I verified that it
can't handle frequencies above about 2900 Hz or below about a couple of hundred
Hertz, probably due its SSB filters passband. When I try to set frequencies out
of the standard my RF power went strongly reduced.
Despite this limitation, from the FT8_DXpedition_Mode instructions we can read
that we could set Tx audio carrier up to 4.000Hz:
Select Tab 1 on the main window for transmitted messages, and set Tx nnnn Hz to
a Tx frequency between 1000 and 4000 Hz. You can also select a Tx frequency by
using Shift+Click on the waterfall display. You may find frequencies above 3000
Hz are desitable because they have less QRM. Select the “Tx1” message under
Next.
Hence I would like to know: is the above Tx audio setting always possible?
How do we can set this higher frequency on older transceivers like mine, which
has not "too much adjustments" to play with?
Thanks for your kind attention!
Best regards,
--
73 de Marco, PY1ZRJ _______________________________________________
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