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ZL3AI > APRDIG 04.04.03 10:58l 255 Lines 9437 Bytes #999 (0) @ WW
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Subj: TAPR Digest, Mar 30, 1/2
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From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
TAPR APRS Special Interest Group Digest for Sunday, March 30, 2003.
1. Re: XASTIR help needed
2. WinAPRS & USB-GPS
3. Re: XASTIR
4. Re: XASTIR help needed
5. Re: XASTIR help needed
6. Radio shack WX station connected to ANY TNC now up and running
7. Re: [amsat-bb] Transmitter combining.
8. Satellite TX Combining
9. Re: XASTIR help needed
10. Re: XASTIR help needed
11. Re: XASTIR help needed
12. Re: XASTIR help needed
13. Re: XASTIR help needed
14. Re: XASTIR help needed
15. Need microphone extension cable for D700A
16. Re: Need microphone extension cable for D700A
17. Re: Need microphone extension cable for D700A
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Subject: Re: XASTIR help needed
From: Andrew Rich <andrew.rich@bigpond.com>
Date: 30 Mar 2003 15:52:54 +1000
X-Message-Number: 1
Ok now i have maps, used .xpm format. next trick how to convert UIVIEW
to XASTIR cords
UIVIEW
152.40.10E 27.18.15S
153.20.65E 27.42.50S
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Subject: WinAPRS & USB-GPS
From: "Jacob Tennant" <k8jwt@ntelos.net>
Date: Sun, 30 Mar 2003 01:01:55 -0500
X-Message-Number: 2
Is there any issues I should be aware of before buying a new GPS that uses
the USB port on my laptop?
Was looking at a few different GPS products in the line of the old Tripmate
style GPS, no display,small,etc...
Prices range around $xx.xx to $xxx.xx.
This GPS is for my mobile truck station were the tracker is only going to be
running while the truck is out and running so the laptop will also be on.
PS:Hope to have some pictures of my mobile setup on the net soon as I get it
finished. ALL MOTOROLA!
Jacob Tennant K8JWT
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Subject: Re: XASTIR
From: "Curt Mills, WE7U" <archer@eskimo.com>
Date: Sat, 29 Mar 2003 23:41:05 -0800 (PST)
X-Message-Number: 3
On Sat, 29 Mar 2003, Phil Thompson wrote:
>However, no mattter what I put in the /usr/local/xastir/maps directory,
>whether it be tiff files, gif files or directories, the map chooser window
>remains totaly blank.
You need to re-index the maps. Maps->Re-Index Maps works or else
kill/restart Xastir.
>Also when xastir 1.1.4 starts, It requests I contact the author for a
>registration number. I am running it on tcp/ip only. However I have been
>unable to locate any method of contacting the author to obtain this number.
To be real anal about this, it's not Xastir that's asking you to contact
the author for a registration number, it's the server you're connecting to.
Xastir gets the packet from the server, doesn't recognize it as anything it
should file away in the database, so it presents this unknown info to you
in a popup window.
Curt, WE7U. archer@eskimo.com
http://www.eskimo.com/~archer
Lotto: A tax on people who are bad at math. - unknown
Windows: Microsoft's tax on computer illiterates. - WE7U.
The world DOES revolve around me: I picked the coordinate system!"
----------------------------------------------------------------------
Subject: Re: XASTIR help needed
From: "Curt Mills, WE7U" <archer@eskimo.com>
Date: Sat, 29 Mar 2003 23:43:41 -0800 (PST)
X-Message-Number: 4
On 30 Mar 2003, Andrew Rich wrote:
>Ok now i have maps, used .xpm format. next trick how to convert UIVIEW
>to XASTIR cords
Use some of the perl programs that came with Xastir: inf2geo.pl
should do it. Were you running Cygwin or some Unix/Linux variant?
I don't think any of the scripts have been tested on Cygwin yet.
Curt, WE7U. archer@eskimo.com
http://www.eskimo.com/~archer
Lotto: A tax on people who are bad at math. - unknown
Windows: Microsoft's tax on computer illiterates. - WE7U.
The world DOES revolve around me: I picked the coordinate system!"
----------------------------------------------------------------------
Subject: Re: XASTIR help needed
From: "Curt Mills, WE7U" <archer@eskimo.com>
Date: Sat, 29 Mar 2003 23:45:18 -0800 (PST)
X-Message-Number: 5
On 30 Mar 2003, Andrew Rich wrote:
>I am confused guys, what do you need to generate a number for ?
>I am in the same boat, all i have ever been able to do is use .MAP
>files.
>
>Can someone help me out, I have gifs and the relavant cord files set up,
>and had the same results, could not see any maps.
Did you follow the instructions in README.1ST or README.win32? If so
then you'll have ImageMagick compiled in if you want to use image
files. If not, go do that first, then imagemaps should work for you.
BTW: The xastir mailing list is the proper place for such questions.
Detailed stuff like this doesn't really belong on a more general list
such as APRSSIG.
Curt, WE7U. archer@eskimo.com
http://www.eskimo.com/~archer
Lotto: A tax on people who are bad at math. - unknown
Windows: Microsoft's tax on computer illiterates. - WE7U.
The world DOES revolve around me: I picked the coordinate system!"
----------------------------------------------------------------------
Subject: Radio shack WX station connected to ANY TNC now up and running
From: "Tony Hunt" <wavetel@iname.com>
Date: Sun, 30 Mar 2003 21:28:39 +0930
X-Message-Number: 6
Just a further note on the developments of the Weather station project here
in Adelaide ..
Andrew VK5EX has made some further improvments to the PIC firmware to allow
for a connection to ANY TNC using Converse mode now .. He has it currently
running on a UI-Digi 1.9 Beta1 as a AUX input.. He has also made provision
to connect it to a Stock standard TNC like a TNC2 KPC or PK232 etc etc using
Converse mode which covers just about any TNC on the market..
This uses the commonly available Radio Shack weather station sold as a
WM-918 in Australia to send out position-less APRS Wx reports..
Anybody else want to build it up and give it a try??
Check it out at http://www.qsl.net/vk5ex
Tony Hunt VK5AH
----------------------------------------------------------------------
Subject: Re: [amsat-bb] Transmitter combining.
From: Bob Bruninga <bruninga@usna.edu>
Date: Sun, 30 Mar 2003 08:48:01 -0500 (EST)
X-Message-Number: 7
On Sun, 30 Mar 2003, nick pugh wrote:
>Bob
>since the communication is digital and busty why transmit simultaneously?
One can also be a full duplex PSK-31 transponer and the other an FM voice
repeater...
Bob
----------------------------------------------------------------------
Subject: Satellite TX Combining
From: "Komljanec" <ve3pep@rac.ca>
Date: Sun, 30 Mar 2003 09:01:38 -0500
X-Message-Number: 8
Hi Bob and all on the list:
You didn't comment on your (probably strict) weight, space and current
consumption constraints. Stating the obvious, using two antennas on
opposite sides of the spacecraft (if this is possible) may be the most
inexpensive way of achieving isolation, along with ferrite isolators on tx
outputs. The 25 dB this may achieve would duplicate the function of the
hybrid in the next example.
Terrestially, where power and space are less of an issue than your "bird",
conventional approaches to your two frequency combining are to use a "dual
isolator hybrid combiner". Each transmitter sees a two-stage isolator (45
dB), and the combining is done by a "hybrid" which is a four port tuned
stub/transformer of sorts. The hybrid is directional and further isolates
the two transmitters (I think it is about 25 dB). 1st port for TX 1, 2nd
port is TX 2, 3rd port is ANTENNA, and 4th port is a DUMMY LOAD.
Unfortunately, half your power (3 dB) will flow into the dummy load. For
only two transmitters, this isn't so bad. IMD performance is excellent.
Typically, you would still have an output bandpass filter to ensure that any
IMD/noise is controlled... the need for this may depend more on any other
receive frequencies you have to ensure there are no TX noise issues.
Another common approach is to use an ultra linear "Feed Forward" amplifier.
In this scenario, you would combine your transmitters right after the
exciter when they are still at the milli-watt power level. You can easily
filter effectively at these power levels and can also afford higher losses.
What is left is then fed to the ultra linear PA which can apply 50 to 60 dB
gains to your composite output. Look at a web site like www.powerwave.com
for more information on these types of PA (... there are other companies
that do this too... don't know which for 435 MHz). Very high gain and low
IMD due to their "Feed Forward" error canceling design. As with any linear
PA, there is a power consumption penalty that has to be paid. Some of these
PA's can be put to sleep in stages when not in use to save some power, but
this would add complexity. Generally, this solution would work well if you
had lots of carriers where the hybrid combiner produced too much loss.
Let us know if you get any interesting solutions that aren't posted to the
SIG.
'73
Tony K, VE3TK
----------------------------------------------------------------------
Subject: Re: XASTIR help needed
From: "Spider" <spider@rivcom.net>
Date: Sun, 30 Mar 2003 07:58:18 -0700
X-Message-Number: 9
----- Original Message -----
From: "Andrew Rich" <andrew.rich@bigpond.com>
To: "TAPR APRS Special Interest Group" <aprssig@lists.tapr.org>
Cc: "TAPR APRS Special Interest Group" <aprssig@lists.tapr.org>;
<"<LYR30130-126751-2003.03.29-21.10.43--andrew.rich#bigpond.com"@lists.tapr.
org>
Sent: Saturday, March 29, 2003 10:52 PM
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