Technical papers are solicited for presentation at the 26th Annual ARRL
and TAPR Digital Communications Conference to be held September 28-30,
2007 in Hartford, Connecticut. These papers will also be published in
the Conference Proceedings (you do NOT need to attend the conference to
have your paper included in the Proceedings). The submission deadline is
July 31, 2007. Please send papers to:
225 Main St
Newington, CT 06111
or you can make your submission via e-mail to: maty(a)arrl.org
Papers will be published exactly as submitted and authors will retain
73 . . . Steve, WB8IMY
AO-16 has been in its "voice mode" continuously for nearly a month now. Many thanks to all the users of this "new" bird!
It is time to pause voice operations long to receive some MBL telemetry (limited as it is, it's all we have). Around 0920 UTC on 17FEB08 I plan to return AO-16 to digital mode in order to receive some telemetry. If all goes as planned, it should be back to "voice mode" during the same pass. If not, I'll try to catch it on the 1056 UTC pass. Most of you will be asleep, so I don't think it will interfere with too many contacts.
Looking to the future, we can see that after several months of continuous illumination, AO-16 will begin to experience eclipse periods at the end of March. The eclipse periods will increase and extend through the summer. This may impact AO-16's power budget such that the transmitter output will have to be reduced in order to protect its 18 year old batteries. We'll know more after the eclipse periods begin in late March and early April.
In the meanwhile, enjoy AO-16 and her strong signals!
73 on behalf of the command team,
Mark L. Hammond [N8MH]
It's unusual to see desense on 2m receive from a 70cm uplink, but I think the same solution can be applied. Many use a common 2m/70cm diplexer as a high pass/low pass filter. In this case you would want to feed the 2m antenna to the common port of the diplexer, and the 2m port of the diplexer to the input of either your preamp or rig if you do not have a preamp. This blocks your transmitted signal from the receiver/preamp input very effectively. http://www.amsat.org/amsat-new/articles/Mode-J/ describes this for 70cm desense issues.
Another option is to use a preamp with good filtering on the input. I had issues with Mode J desense with my Icom AG-35 preamp, but have none now that I have switched to SSB Electronics preamps.
As always, Your Mileage May Vary (YMMV).
73, Drew KO4MA
>From: "Reicher, James" <JReicher(a)hrblock.com>
>Sent: Jun 30, 2008 12:50 PM
>Subject: [amsat-bb] Eliminating Desensing
>I got significant de-sensing of my 2 meter downlink from my 70cm uplink at Field Day. I know a good part of it was due to the short cross-boom (about 4 feet) I was using. I would like to decrease the de-sense on this set-up before I permanently install it at my home station. Any and all suggestions are welcome.
>73 de W0HV, Jim in Raymore, MO
>Light travels faster than sound... This is why some people appear bright until you hear them speak.
>Sent via AMSAT-BB(a)amsat.org. Opinions expressed are those of the author.
>Not an AMSAT-NA member? Join now to support the amateur satellite program!
>Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
I got significant de-sensing of my 2 meter downlink from my 70cm uplink at Field Day. I know a good part of it was due to the short cross-boom (about 4 feet) I was using. I would like to decrease the de-sense on this set-up before I permanently install it at my home station. Any and all suggestions are welcome.
73 de W0HV, Jim in Raymore, MO
Light travels faster than sound... This is why some people appear bright until you hear them speak.
I have tried at times to give it a shot of RF uplink, "just in case". I mean after all AO-7 came back to us! Maybe it just needs enough up RF to jump start it. Does anyone know what it's final demise was from?
73 Bob W7LRD
"if this were easy, everyone would be doing it"
-------------- Original message --------------
From: "Auke de Jong, VE6PWN" <sparkycivic(a)shaw.ca>
> I just copied the beacon on 29.351, after not hearing anything for a long tmie.
> It's sending relatively short duration pulses today... 1 second on, 2 seconds
> off, give or take... later in the ascending pass(as I write this) , times are up
> to greater-than 4 seconds off /.75 seconds on Does that mean the spacecraft is
> Strange, that this is the ONLY mode-A signal around these days-besides AO-7 if
> she feels like it ;)
> Auke de Jong
> Edmonton, AB
> Sent via AMSAT-BB(a)amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
The SpaceX website has the following launch windows:
"The next launch window opens 29 July and runs through 6 August, followed by
one from 29 August to 5 September.
The Falcon 1 will carry the Trailblazer satellite for the Jumpstart Program
of the Department of Defense’s Operationally Responsive Space Office (ORS).
Additional secondary payloads include an adapter system developed by the
government of Malaysia that holds two small NASA satellites.
SpaceX will provide complete launch day coverage and a live webcast of the
launch and ascent into orbit.
Details will be announced as the launch date approaches via the _SpaceX.com_
In a message dated 30/06/2008 21:08:35 GMT Standard Time,
This launch has been postponed. I will provide a new launch date when it
has been determined.
Please let me know any questions.
I've been trying to get RASCAL to run on my Intel Mac mini (10.4.11).
I've installed soylatte16 to get the JRE 1.6 compatibility, but when
I launch the .jar I get the following error:
Unknown error javax/swing/GroupLayout$Group
The is not found on your computer.
please check: javax/swing/GroupLayout$Group or reinstall Rascal
I'm trying to run the .jar from my home directory, I kept the folder
structure the same (i.e. the lib folder is inside the RASCAL folder).
Any suggestions on resolving this error?