Two things belong in different places, and they were in one.
Settings → Satellites now holds the setup: which satellites to follow —
the same two-column shape as the awards, for the same reason, since a
feed carries two hundred birds and an operator works six — and the
orbital elements, their age, the fetch, and pasting your own. Following
none still means every satellite with both elements and a frequency plan,
so somebody who has not chosen yet is not handed an empty tab.
The panel keeps only what a pass needs. A countdown to AOS, or to LOS
once it is up, because that is the number that decides whether you sit
down; a bar for where in the pass you are, since mid-pass the useful
question is not the clock but whether you are past the peak; rise, peak
and set with compass directions, because "rises SW" is a direction to
look in and 213° is arithmetic. Distance, altitude and footprint. And
approaching or receding, which is the sign of the whole Doppler
correction and the only thing that explains why the frequencies are
moving the way they are.
The countdowns run in the browser from two timestamps. Predicting a pass
steps the orbit across a day thirty seconds at a time, which is not
something to do once a second for a clock the page can keep itself.
Two things reported together on the new tab.
The locator: the station's is on the ACTIVE PROFILE, not in a settings
key. keyStationMyGrid is a legacy key that EnsureDefault migrated into
the profile long ago and nothing writes any more, so reading it told an
operator with a perfectly good locator on screen that he had not set one
— and refused every pass prediction on the strength of it.
The map: Leaflet stacks its panes and controls up to z-index 1000, which
without a stacking context of their own float over the whole application
— Preferences opened behind the map, its Save and Close buttons under it.
The other three maps in OpsLog each carry `isolate` for exactly this
reason; this one was missing it.
EasyComm is what satellite rotator controllers agreed on, so a box that
works with SatPC32, Gpredict or Hamlib works here. Serial or TCP, and its
own settings rather than the HF rotator's: an az/el pair is a different
machine on a different port, and an operator who has both must not have
to choose.
A great many EasyComm controllers — the Arduino trackers above all —
accept commands and never say a word back. That is legal and common, so a
silent controller is not treated as a broken one: it is still driven, and
the last commanded position is reported in its place, marked as commanded
rather than read. A stuck rotator must not be able to hide behind an
order it never carried out, which is why the panel shows the antenna's
position beside the satellite's.
The 450° overlap is the reason a satellite rotator is worth having, so it
is used: a pass crossing north continues past 360 instead of unwinding
three quarters of a turn with the antenna sweeping the ground. Below the
configured elevation the mast is left alone — the numbers are right all
the way round the orbit, but a rotator that chases a satellite through
the far side of the earth spends the night turning, and a mast has a
finite number of turns in it.
The hard part of satellite tuning is not the arithmetic, it is deciding
who owns the dial. A tracker that forces both frequencies fights the
operator every time they turn the knob to follow a station across a
linear transponder; one that never touches the receiver leaves them
chasing a signal that slides nine kilohertz across a 70 cm pass.
So the operator owns the receiver and the tracker follows them. Every
second it asks the radio where the receiver actually is. Where it put it,
nothing has changed. Further than a dial-turn's tolerance, and the
operator has chosen a station: what they landed on is converted back into
a nominal frequency, and the transmitter is derived from that. Which is
the division of labour on a linear bird — the operator listens, the radio
does the sums.
Three ways to reach the radio, because a satellite pair is a shape of
operating rather than a manufacturer's feature. An IC-9700 or IC-9100 is
asked for its OWN satellite mode: it pairs main and sub, gives full
duplex, and keeps the dials linked the way its designers meant, which is
always better than an imitation built out of split. A Flex gets two
slices, A the downlink and B the uplink, created when missing, because
"slice B does not exist" is not something to make an operator fix at the
start of a ten-minute pass. Everything else gets the downlink, and is
told so — half the job announced beats half the job hidden.
What goes in the log is the NOMINAL pair. Two stations working each other
through a transponder read different numbers off their dials at the same
instant; the only figure they can both agree on is the transponder's own.
FREQ is the uplink and FREQ_RX the downlink — the one place a satellite
QSO differs from every other kind, and the reason FREQ alone cannot
describe one.
Three questions answered at once, because on a pass there is no time to
go looking for any of them: where the bird is, when the next one comes,
and what to tune. The map draws each satellite's footprint — the honest
answer to "can I hear it", since everything inside the circle has the
satellite above its horizon — and the selected one's path over the
ground. The pass list is every favourite in time order, the one in
progress in green.
The readout shows the corrected frequency large and the nominal one
beneath it. Only one of them, and an operator cannot tell a Doppler
correction from a mistuned transponder.
The map opens on the station rather than the Atlantic, and remembers
where it was left like the others. The panel is mounted only while its
tab is visible: it asks for the tuning once a second, and there is no
reason to compute an orbit nobody is looking at.
rouggy