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MacWorld 1999 July
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Macworld (1999-07).dmg
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MacDoppler_v3.8.7
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MacDoppler FAQ
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1999-02-26
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MacDoppler Frequently Asked Questions
Q. How do I grow the map and keep it square ?
A. If you hold the option key while dragging the bottom right corner of
the map, the square aspect ratio will be maintained.
Q. How can I get the frequency slider to display ?
A. If you are using System 7 you must install the Appearance Manager
(Available from my web site) to display the frequency slider.
Q. How do I update the Keplerian elements ?
A. Simply edit out the header at the start, and '/EX' at the end of the
keplerian elements file, rename the file to 'kepler.dat' and move it to
the same folder as MacDoppler and restart MacDoppler.
Q. When does the ground track line start ?
A. It starts at current position and goes till 2 hours on the PPC and 1 hour
on the 68k machines. It turns from blue to red for that portion where the
Satellite will be visible. The other Satellite in the track list draw a
ground track line 45 minutes ahead on the PPC and 30 minutes on the 68k.
Q. What is the pass time? It seems to stay zero for a Satellite below the
horizon. If the sat is up it seems to count up from zero starting at the
time I first begin to track the Satellite. If this is correct what is
its intended use?
A. Pass time measures time to AOS (dependant on your minimum elevation) until
Satellite elevation surpasses minimum elevation set by user, then Pass
measures elapsed time since AOS (and changes to red), at LOS it reverts to
time till next AOS.
Q. What are the two gauges to the left of the CAT button ? One has a
partial red line and the other a blue line across the box. Clicking on
them doesn't seem to do anything.
A. The one on the left is a 'compass' graphical representation of azimuth.
The one on the right is a graphical representation of elevation and
displays Satellite degrees above the horizon.
Q. What is the coding of the color of some of the text. For some sats that
are above the horizon the elev is red and for others blue ?
A. The elevation is shown in red while the Satellite is visible and ascending
and then switches to blue when the Satellite is visible and descending.
The azimuth is shown in red when the Satellite is visible.
Q. Can you tell me the coding of the fonts in the Satellite list ?
A. Outline means AOS within an hour.
Outline + Bold means AOS within twenty minutes or already visible.
Q. What is the difference between MacDoppler and MacDoppler.FPU
A. MacDoppler is a 'Fat Binary' and will run native on a power pc or
in 68k mode on the older 68k Macs. MacDoppler.FPU is for use only
on 68k Macs that have an FPU (Floating Point Unit).
Q. How do I set the time or the hours from UTC ?
A. The time and hours from GMT are set in the Date and Time Control Panel
under the Apple Menu rather than through MacDoppler. To double check the
time settings make sure that the 'UTC' time displayed in the top part of
MacDoppler agrees with a known source/clock.
Q. What is the Options menu Debug Log for ?
A. Selecting that menu option (it defaults to 'Off') will cause everything
that comes back from the radio interface to be saved to a file. This is
used with the AutoTracker, for example, to degug problems.
Q. What is 'Full Doppler Tuning' ?
A. In accordance with common practice, in mode JA, the up link (lower)
frequency is pegged and the Doppler correction for both transmit and receive
is applied to the receive (down link) frequency. Conversely, in mode B the
down link (lower) frequency is pegged and the Doppler correction for both
transmit and receive is applied to the transmit (up link) frequency.
You may also select 'Full Doppler Tuning' from the Options menu (it defaults
to 'Off') to select Doppler adjustments to be made for both the up link and
the down link even when in Mode JA or Mode B - this keeps the frequencies
stable with respect to the transponder and no drifting through the
transponder will occur. This is useful for QSO's with more than two
geographical locations - but of course, all operators engaged in the QSO
must be using the same method.
(See 'A Recommendation for Doppler Tuning' by Ron Parson, W5RKN,
Amsat Journal, Volume 19, #2 p 18. 1996).
'Full Doppler Tuning' is the norm for AO-27 and the PacSats, so you don't
have to select it from the menu when using MODE_J_FM.
Q. What is the "Serial Tool" for ?
A. "Serial Tool" is a Communications ToolBox tool provided by Apple to
facilitate serial port communication, you may already have one in your
extensions folder, if not simply drag the one supplied with MacDoppler
into the extensions folder within your System Folder.
Q. Can I run multiple copies of MacDoppler on the same Macintosh ?
A. Yes, just put them in different folders so that they each have a different
copy of the "MacDoppler Settings" file.
Q. What is the vertical black strip between the numbers area and the buttons ?
A. That is the 'S' meter, but is is only supported on the Yaesu FT-736R and
the AOR-3000A (it 'lights up' with blue segments).
Q. How can I improve my tracking accuracy ?
A. You can improve the accuracy of your computer clock, by using 'AutoClock'
or 'Vremya' time setting programs (MacOS 8.5 has a network time setting
option built in to the 'Date & Time' Control Panel). Also, borrowing a GPS
to get accurate Latitude, Longitude, and Elevation readings for your site
configuration can help immensely. As a final check, try one of the early
evening passes of MIR and see how well your antennas agree with the visual
sighting. If your computer clock is out even a few seconds, it can throw
the tracking off considerably.
Q. My Yaesu FT-847 does not "report" back the current frequency. I was told by
someone who subscribes to the AMSAT Bulletin Board that this has caused
a flurry of negative comments about the FT-847. Is this really a problem ?
How does MacDoppler handle this ?
A. Not as far as MacDoppler is concerned. MacDoppler was originally written
for the Yaesu FT-736R, and with that radio, when you are in CAT mode the
radio front panel is locked out entirely, so the basic design philosphy of
MacDoppler is to control as much as possible from the computer, and use
the radio front panel only where necessary. From this we derive the
8 'channel' steps/modes, the up and down buttons and the frequency slider
which allows you to sweep the downlink VFO through the transponder range
while the transmit frequency tracks the receive frequency. When you hear
something interesting, MacDoppler continues to track the frequency through
the Doppler changes. For AO-27, MIR, and the PacSats it's a moot point
since there is no need to query the VFO in these modes.
Q. How do I 'find myself' on AO-10 ?
A. If the uplink/downlink frequency numbers in mode.dat are slightly off
simply disengage the 'TLock' button by clicking on it. This will allow
you to make fine adjustments to the uplink and downlink frequencies
independent of one another. Several clicks on the up or down buttons
are usually all that is required. Reengage the 'TLock' button and
the change you have made will track throughout that channel. These
off sets are remembered in the preferences, but are sensitive to
Satellite order in the keplerian elements If you want to make the
change permanent, simply edit the 8 pairs of uplink/downlink frequencies
in Mode.dat.
Q. When does the program start the flip mode relative to rise?
A. It starts into flip mode at AOS. The rotors go directly from park az-el
to AOS az-el. If you select -1 or -2 as the minumum elevation from the
'Site Info Dialog', then the antenna will be there waiting for AOS
a few moments before it happens. This isn't necessary in some locations
if the Satellite isn't useable until it has reached 3 or 4 degrees.
Q. Do you give the operator some sort of visual indication of when it is in
flip mode ?
A. If the 'Show DeadSpot Crossing' is selected from the Options menu
The southern crossing line turns red long before AOS - as soon as a
southern cross is detected - usually just after the Satellite is
selected - either from the menu or automatically by the look ahead
options {Track List). Also, if 'Speech' is selected from the
Options menu and 'Show DeadSpot Crossing' is selected, MacDoppler
speaks: "FO-20 will be crossing a southern deadspot".
Q. MacDoppler complains that it is missing something called 'SpeechLib'
when I try to run it. Where do I find 'SpeechLib' ?
A. Use your MacOS install CD to install 'Text To Speech'. This is an
optional MacOS install which allows MacDoppler to tell you about upcoming
satellite passes.
D o g P a r k S o f t w a r e L t d .
email: dogpark@interlog.com
www: http://www.interlog.com/~dogpark