Hi Tim,
some comments in line below.
On 07/05/2018 04:00, Timothy Hickman wrote:
I made a QSO yesterday with W7/KH7 from FM19 during the DX testing
exercise. It took over an hour.
Thanks for joining the test, we could not simulate true pile ups without
the help of so many of you.
I was using the latest version1.9.0-rc4 ona windows 10 laptop and my
FT990 rig...
The FT990 changed several times on transmit from 14.150 to 14.145 or
14.140.
I assume you mean 14115.0, 14114.5, and 14114.0 kHz respectively.
A better explanation of split mode faking it would be helpful.
The aim is two-fold, firstly to extend the Tx range to at least that of
your widest Rx filter and secondly to keep the audio tones fed to your
rig above 1500 Hz so that any harmonics generated by non-linearities in
the analogue audio path between your sound card and rig are well
suppressed. The principle is simple really, your on-air transmit
frequency is the sum of your USB dial frequency and the audio offset
sent to you rig. WSJT-X can adjust both of those values in opposite
directions by equal amounts and thereby not change your on-air transmit
frequency. This is what "Settings->Radio->Split Operating" does such
that the audio tones sent to your rig are always between 1500 Hz and
2000 Hz.
Note that by having the audio above 1500 Hz the second audio harmonic is
above 3000 Hz and therefore above the low pas cut-off frequency of your
rig's SSB Tx filter which will be around 2800 Hz.
The widest filter or the FT990 is 2.4K so is split mode fake it or
real split necessary?
See above. Also your rig's widest Rx SSB filter is probably wider than
2400 Hz and you surely want to be able to transmit at any audio offset
that you can decode.
Also the waterfall stopped showing other stations making calls several
times.
In FT8 DXpedition mode the check box "Rx All Freqs" determines whether
you decode other Hound stations above 1000 Hz when you are not
transmitting yourself. Obviously when you are transmitting you will not
decode any other Hounds since you are all transmitting on the same T/R
period, i.e. odd ones.
Is this a rig interface problems or software problems?
Thanks for all your work.
I am looking forwards to bagging some new countries with FT8.
Tim
N3JON
73
Bill
G4WJS.
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