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1994-11-13
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Date: Sat, 19 Mar 94 04:30:25 PST
From: Ham-Digital Mailing List and Newsgroup <ham-digital@ucsd.edu>
Errors-To: Ham-Digital-Errors@UCSD.Edu
Reply-To: Ham-Digital@UCSD.Edu
Precedence: Bulk
Subject: Ham-Digital Digest V94 #74
To: Ham-Digital
Ham-Digital Digest Sat, 19 Mar 94 Volume 94 : Issue 74
Today's Topics:
9k6 baud TheNet X-1J parameters?
Adaptive Routing of HF Packet Messages / Solar Propagation
JNOS from a 720K floppy?
Net that support LoAppleltalk
Propagation and Radio System Engineering.
Send Replies or notes for publication to: <Ham-Digital@UCSD.Edu>
Send subscription requests to: <Ham-Digital-REQUEST@UCSD.Edu>
Problems you can't solve otherwise to brian@ucsd.edu.
Archives of past issues of the Ham-Digital Digest are available
(by FTP only) from UCSD.Edu in directory "mailarchives/ham-digital".
We trust that readers are intelligent enough to realize that all text
herein consists of personal comments and does not represent the official
policies or positions of any party. Your mileage may vary. So there.
----------------------------------------------------------------------
Date: Thu, 17 Mar 1994 22:59:21 +0000
From: ihnp4.ucsd.edu!swrinde!emory!europa.eng.gtefsd.com!howland.reston.ans.net!pipex!demon!fusk.demon.co.uk!db@network.ucsd.edu
Subject: 9k6 baud TheNet X-1J parameters?
To: ham-digital@ucsd.edu
I would expect a useful increase on good links by using an MTU of 1024,
unless you have fast switching radios, though haven't actually used X-1J for
IP. We got >500bps FTP rates between NOS systems as opposed to ~300bps with
MTU of 256. TxDelay was 100mS.
Regards, Dave
------------------------------
Date: Fri, 18 Mar 94 09:28:24 GMT
From: ihnp4.ucsd.edu!dog.ee.lbl.gov!agate!howland.reston.ans.net!news.moneng.mei.com!uwm.edu!reuter.cse.ogi.edu!netnews.nwnet.net!serval!eecs.wsu.edu!glagowsk@network.ucsd.edu
Subject: Adaptive Routing of HF Packet Messages / Solar Propagation
To: ham-digital@ucsd.edu
One of my graduate students would like to do a master's thesis on the
topic of Adaptive Packet Network Traffic Routing to adapt to periodic
and random changes in the ionospheric propagation (HF) due to solar
effects.... initially he plans to do a simulation based on an idealized
model, but later we would like to test it out using the USAF MARS packet
radio network.....
My question is: are you, or do you know of anyone interested in this work,
particularly regarding possible University grants/contracts....
Anyone with ideas on whom to contact... please reply
--
- Terry G.
===========================================================================
Dr. Terry G. Glagowski INTERNET: glagowsk@eecs.wsu.edu
Assistant Professor PROFS: glagowsk
Electrical Engr. & Computer Sci. LOCATION: 12th Floor Farm Credit Bldg.
Washington State University PHONE: (509) 456-3275
West 601 First Avenue FAX: (509) 456-2866
Spokane, WA 99204-0399 USAF MARS: AFA5BP AMATEUR: W1TR
------------------------------
Date: Thu, 17 Mar 1994 18:47:03 GMT
From: ihnp4.ucsd.edu!swrinde!cs.utexas.edu!howland.reston.ans.net!torn!govonca!rumbalj@network.ucsd.edu
Subject: JNOS from a 720K floppy?
To: ham-digital@ucsd.edu
Thank you for reading this posting.
I would like to know if it's possible to set up JNOS v1.10 so it will run
from a laptop that has a single 720K floppy drive?
If it IS possible, could you tell me what the key files are that I'd need
(besides NOS.EXE and AUTOEXEC.NOS)??
Thanks, in advance, for your comments.
73 de John
--
: : John E. Rumball
: ... :.. :.. Sudbury, ON
:.: :.: : : : : rumbalj@gov.on.ca
------------------------------
Date: 18 Mar 94 18:20:00 GMT
From: news-mail-gateway@ucsd.edu
Subject: Net that support LoAppleltalk
To: ham-digital@ucsd.edu
Anyone know a version of Net(for Pcs) thet support Appleltalk. I am
using the Nosview version. This version can not atach to appleltalk. I would
like to attach my pc to localtalk using net TCP/IP.
If somebody could help me, please send mail to me.
Eduardo Millar
Proyecto Enlaces
e-mail:enlaCES.UFRO.CL
------------------------------
Date: 18 Mar 94 14:29:32 GMT
From: news-mail-gateway@ucsd.edu
Subject: Propagation and Radio System Engineering.
To: ham-digital@ucsd.edu
Hi, This message is in response to emillar@enlces.ufro.cl 's message
requesting information on propagation. The source article on this subject
is "Radio Propagation Fundamentals" by Kenneth Bullington. It was published
in the Bell System Technical Journal (BSTJ), Volume XXXVI, #3, May 1957.
Of primary improtance to Packet Radio RF path engineering is the section
on figuring Fresnel loss. This is the loss due to the path be partially
occulted by the earth. Almost all terrestrial radio paths have this effect.
Microwave paths, however can usually be engineered to reduce the effects, and
thus greatly reduce the power requirements for a given path. Only when the
beam width of the antenna, significantly attenuates in the direction of the
interviening ground, between a transmitter and reciever, can the Fresnel Loss
be ignored.
If u are also interested in general Radio System Engineering, my article
in the 7th (1988) ARRL CNC, would also be of interest to you. That is, Radio
System Engineering, as it applies to Packet Radio.
73, Don. wb9mjn%wb9mjn.ampr.org@wb9uus.bradley.edu
------------------------------
End of Ham-Digital Digest V94 #74
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