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1994-11-13
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Date: Wed, 10 Aug 94 04:30:20 PDT
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 #266
To: Ham-Digital
Ham-Digital Digest Wed, 10 Aug 94 Volume 94 : Issue 266
Today's Topics:
900 MGHz FM
900 MHz spread spectrum systems (2 msgs)
??USING MAC WITH KPC-3 AN
cell sites
DRSI DPK-9600 to node stack?
F6FBB Mailing List
IP address Help (2 msgs)
Is this the place to talk DSP?
local organizations that help people get acquainted with packet radio
Need Kam+ to HTX-202 Cable
Need some help with the design of an Operational Amplifier
Recommendations on low-power TNC
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: 5 Aug 1994 05:02:44 GMT
From: ihnp4.ucsd.edu!newshub.sdsu.edu!nic-nac.CSU.net!usc!howland.reston.ans.net!darwin.sura.net!aurora.LaTech.edu!ems@network.ucsd.edu
Subject: 900 MGHz FM
To: ham-digital@ucsd.edu
Can anyone help get the circuits for FM transmitter/receiver in the range of 902-928.
I need the circuits for a project I'm working on.
ems@engr.latech.edu
or
203 homer
Ruston, La 71270
------------------------------
Date: Mon, 8 Aug 1994 23:15:16 GMT
From: news.sprintlink.net!news.dorsai.org!stevalln@uunet.uu.net
Subject: 900 MHz spread spectrum systems
To: ham-digital@ucsd.edu
David R. Wolf (wolf@beta.lanl.gov) wrote:
: lately i've become interested in the level of security actually provided by
: the 900 mhz spread spectrum phones. for instance, could a hacker with a
: pc and a smattering of outboard hardware have a good chance of decoding one's
: 900MHz phone calls?
: does anyone have any details on the ss systems used in, say, the escort
: phones? spreading sequence generator, moduation methods, synchronization
: schemes, etc.? one of the felows that i talked with at cincinnatti microwave
: suggested that their phones choose a spreading sequence randomly whenever the
: phone gets used. is this true?
My understanding is that these phones use direct sequence spread spectrum.
I was browsing thru a book on this the other day (idly, at the bookstore
while looking for other stuff), and seem to recall reading that dsss is
the easiest mode to sync to. I think you sort of slide your sequence back
and forth over the signal, and when they're synced, the signal gets clear
in an easily detectable way. (Can't remember the details of that, tho).
If you know what you're doing, and have the sequence, it should be easy.
I think there's lots of snake-oil out there involving security of
these phones. When they say "Uses digital spread-spectrum techniques with
64,000 different codes," they may probably be saying that there's one
sequence and 64K access codes to dial out, which is the same as an analog
cordless with 64K security.
-Steve
p.s. There are reports that the audio is transmitted in the clear on 450
MHz. Not sure of the signal level, tho.
------------------------------
Date: Tue, 9 Aug 1994 13:58:00 GMT
From: ihnp4.ucsd.edu!news.cerf.net!gopher.sdsc.edu!nic-nac.CSU.net!charnel.ecst.csuchico.edu!yeshua.marcam.com!zip.eecs.umich.edu!umn.edu!mr.net!idss.nwa.com!csinc!chrise@network.ucsd.edu
Subject: 900 MHz spread spectrum systems
To: ham-digital@ucsd.edu
In article <Cu8oLH.11v@dorsai.org>, Steve_Allen <stevalln@dorsai.org> wrote:
>David R. Wolf (wolf@beta.lanl.gov) wrote:
>: lately i've become interested in the level of security actually provided by
>: the 900 mhz spread spectrum phones. for instance, could a hacker with a
>: pc and a smattering of outboard hardware have a good chance of decoding one's
>: 900MHz phone calls?
>
[ deletions ]
>-Steve
>p.s. There are reports that the audio is transmitted in the clear on 450
>MHz. Not sure of the signal level, tho.
>
yes... I reported this late last week... and am still researching it. My
phone though, is the Tropez 900 DL which is not spread-spectrum but
digitally modulated on single carriers within the 900 MHz band. What I
have found is that there is some leakage of in-the-clear audio in the
430 MHz amateur band from the handset. Others have found and reported
similar signals. I am trying to get someone from VTech (the manufacturer
of the phone) to discuss this with me... but they seem to be having trouble
returning my calls.
Chris
--
Chris Elmquist, N0JCF voice: (612)631-7614
chrise@comtrol.com fax: (612)631-8117
------------------------------
Date: Tue, 02 Aug 94 21:15:47 -0700
From: netcomsv!netcomsv!lavc!lou.meiss@decwrl.dec.com
Subject: ??USING MAC WITH KPC-3 AN
To: ham-digital@ucsd.edu
Back on 08-02-94, Jeff said...
> Thank you for reading this..I have a Mac Classic and a Mac Apple and
> am considering using it with my KPC-3 with a Hostmaster program for
> packet. Right now I am using a PC with the KPC-3 for packet and it wo
> very well..Would this set up with the Mac work better?? Would it be f
> or slower then the PC?. Does the MAC to TNC cable special?? Thanks f
> reading this..Hope you can help..Jeff
Jeff, It really won't make any difference which computer you use. The
big difference will be which software you like. That's assuming you are
going to use AX-25 Packet. In that mode, the TNC just looks like a Modem
to the computer. Matter of fact, I run Procomm when I do AX-25 with my
PC. I suppose one difference might be, if you are using an older PC (XT,
slow 286) and are unable to run 9600 baud between the computer and TNC,
then you might see an increase in the presumed speed with the MAC. AX-25
packet with the KPC-3 is still only 1200 baud on VHF and 300 baud on HF.
That won't change no matter what computer you use.
As far as cables go, just about any standard RS-232 Serial cable will
work just fine. The only difference would be the connector on the back
of the MAC.
Hope this helps and let me know if I can be any more help,
73 de Lou
AMPRnet - wa6epd@wa6epd.ampr.org [44.16.1.24]
Internet - lou.meiss@support.com
AX-25 - wa6epd@wb6wfh.#soca.ca.usa.noam
------------------------------
Date: 10 Aug 1994 02:30:11 GMT
From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!vixen.cso.uiuc.edu!sdd.hp.com!hpscit.sc.hp.com!cupnews0.cup.hp.com!cupnews2.cup.hp.com!bmp@network.ucsd.edu
Subject: cell sites
To: ham-digital@ucsd.edu
yctcsl@cerfnet.com wrote:
: Does anyone have any info regarding the rate paid by PacBell (AirTouch) for
: establishing a cell site lease. The offers been made however I'd be interested to
: find out just what being paid these days.
I'd negotiate for a phone or two with free airtime as part of the deal.
Brian
------------------------------
Date: Tue, 9 Aug 1994 16:22:16 GMT
From: ihnp4.ucsd.edu!dog.ee.lbl.gov!newshub.nosc.mil!avalon.chinalake.navy.mil!gawain.chinalake.navy.mil!jan@network.ucsd.edu
Subject: DRSI DPK-9600 to node stack?
To: ham-digital@ucsd.edu
Hello all!
I need to figure out the mod for the DRSI DPK-9600 TNC so
that the serial port talks xlink with TheNet X-1J. I've
done this with 3 or so TNC-2s, but I can't figure out
where the JMP9 or for that matter, where pin 23 is (it
has a DB-9 connector) Anyone offer some hints?
73, jan
kc6uth
jan@archimedes.chinalake.navy.mil
------------------------------
Date: Sun, 7 Aug 1994 21:30:13 -0600
From: ihnp4.ucsd.edu!ucsnews!newshub.sdsu.edu!nic-nac.CSU.net!usc!howland.reston.ans.net!spool.mu.edu!bloom-beacon.mit.edu!senator-bedfellow.mit.edu!pschleck@network.ucsd.edu
Subject: F6FBB Mailing List
To: ham-digital@ucsd.edu
Welcome!
You have joined the f6fbb-list@stat.com The purpose of this server is
to provide Sysops and Networkers with tricks/tips/help and new software
updates concerning the F6FBB bulletin board system. Exchange of UUENCODED
files through the server is ok.
Your Sysop for the server is Daniel J. Meredith,
(n7mrp@n7mrp.az.usa.na), (daniel.meredith@aznetig.stat.com).
----
To Send Mail To Be Distributed To All Subscribers:
f6fbb-list@stat.com
And Send Normal Subject And Text.
----
To REMOVE Yourself From This Server, Please Send Electronic Mail To:
listserv@stat.com
And Include The Command:
unsubscribe f6fbb-list
As The First Line of Your Message.
----
To ADD Yourself To This List, Please Send Electronic Mail To:
listserv@stat.com
And Include The Command:
subscribe f6fbb-list
As The First Line of Your Message.
----
Requests For HELP From A SYSOP - Send E-mail To:
f6fbb-list-request@stat.com
The F6FBB Server has been established to help Sysops and Networkers alike, in
providing help and information in a timely manner. Sharing of software and
other miscellaneous information via the server is quite alright.
Best Wishes!
Daniel J. Meredith
Listowner F6FBB-LIST@STAT.COM
\---------------------------------------------------------------------------/
Daniel J. Meredith |Internet: daniel.meredith@aznetig.stat.com
P.O. Box 44563 | Ax.25: n7mrp@n7mrp.az.usa.na
Phoenix, Arizona |ListOwner: f6fbb-list@stat.com
85064-4563 ___|"ALL Comments Are My OWN, NOT My Employer"
Voice : +1-602-809-7384 | BELL ATLANTIC MOBILE SYSTEMS
Home & Fax : +1-602-956-2566 | Internet: ba.com
Data PBBS : +1-602-912-0225 | Banyon: Daniel J. Meredith@CS_TEMPE@BAMASW
---
Editor, HICNet Medical Newsletter
Internet: david@stat.com FAX: +1 (602) 451-1165
Bitnet : ATW1H@ASUACAD
------------------------------
Date: 6 Aug 94 09:10:00 GMT
From: lll-winken.llnl.gov!overload.lbl.gov!agate!howland.reston.ans.net!gatech!wa4mei!totrbbs!steve.diggs@ames.arpa
Subject: IP address Help
To: ham-digital@ucsd.edu
Bob,
Here is a recent list of the US IP address coordinators. I deleted the
Int'l folks for brevity. Let me know if you need them, too.
SD
AMPRNet IP address coordinators as of 11 July 1994
Corrections and updates to brian@ucsd.edu.
Note: the people listed here have volunteered to issue IP addresses for
their areas. They are not paid to do this service; please understand
that they are perfectly at ease to deal with coordination responses at
a lower priority than the things that matter more, such as job and
family. Please be patient when requesting an address.
44.002 Bob Meyer K6RTV Calif: Sacramento
44.004 Douglas Thom N6OYU Calif: Silicon Valley - San Francisco
44.006 Don Jacob WB5EKU Calif: Santa Barbara/Ventura
44.008 Brian Kantor WB6CYT Calif: San Diego
44.010 Terry Neal AA6TN Calif: Orange County
44.012 Steven King KD7RO Eastern Washington,Idaho
44.014 John Shalamskas KJ9U Hawaii & Pacific Islands
44.016 Jeff Angus WA6FWI Calif: Los Angeles - S F Valley
44.017 Dana Myers KK6JQ Calif: Antelope Valley/Kern County
44.018 Geoffrey Joy KE6QH Calif: San Bernardino & Riverside
44.020 Fred Schneider K0YUM Colorado: Northeast
44.022 John Stannard KL7JL Alaska
44.024 Bob Donnell KD7NM Washington state: Western (Puget Sound)
44.026 Ron Henderson WA7TAS Oregon
44.028 Jack Snodgrass KF5MG Texas: North
44.030 J Gary Bender WS5N New Mexico
44.032 Bdale Garbee N3EUA Colorado: Southeast
44.034 Jeff Austen K9JA Tennesee
44.036 Doug Drye KD4NC Georgia
44.038 Mike Abbott N4QXV South Carolina
44.040 Matt Simmons KG7MH Utah
44.042 John Martin KB5GGO Mississippi
44.044 Bob Wilson KA1XN Massachusetts: western
44.046 Stan Wilson AK0B Missouri
44.048 Jacques Kubley KA9FJS Indiana
44.050 Ron Breitwisch KC0OX Iowa
44.052 Gary Grebus K8LT New Hampshire
44.054 Ralph Stetson KD1R Vermont
44.056 Johnathan Vail N1DXG Eastern&Central Mass
44.058 Rich Clemens KB8AOB West Virginia
44.060 Howard Leadmon WB3FFV Maryland
44.062 Jim DeArras WA4ONG Virginia
44.062 Jon Gefaell KD4CQY Virginia (Charlottesville Area)
44.064 Dave Trulli NN2Z New Jersey: northern
44.065 Bob Applegate WA2ZZX New Jersey: southern
44.066 John DeGood NU3E Delaware
44.068.1-32 Bob Foxworth K2EUH New York: NYC & Long Island
44.068.64+ Bob Bellini N2IGU New York: ENY
44.069 Paul Gerwitz WA2WPI New York: WNY
44.070 Gary Sanders N8EMR Ohio
44.072 Ken Stritzel WA9AEK Chicago - North Ill.
44.073 Chuck Henderson WB9UUS South/Central Ill.
44.074 Mark Bitterlich WA3JPY North Carolina (east)
44.075 Charles Layno WB4WOR North Carolina (west)
44.076 Kurt Freiberger WB5BBW Texas: south
44.077 Rod Huckabay KA5EJX Texas: west
44.078 Joe Buswell K5JB Oklahoma
44.080 Doug Crompton WA3DSP Pennsylvania: eastern
44.082 Steven Elwood N7GXP Montana
44.084 Bob Ludtke K9MWM Colorado: Western
44.086 Reid Fletcher WB7CJO Wyoming
44.088 Bill Lyman N1NWP Connecticut
44.090 Mike Nickolaus NF0N Nebraska
44.092 Pat Davis KD9UU Wisconsin, upper peninsula Michigan
44.094 Andy Warner N0REN Minnesota
44.096 Don Bennett K4NGC District of Columbia
44.098 Brian A. Lantz KO4KS Florida
44.100 Richard Elling KB4HB Alabama
44.102 Jeff King WB8WKA Michigan (lower peninsula)
44.104 Charles Greene W1CG Rhode Island
44.106 Allan B Dayton N0KFO Kentucky
44.108 James Dugal N5KNX Louisiana
44.110 Richard Duncan WD5B Arkansas
44.112 Bob Hoffman N3CVL Pennsylvania: western
44.114 Steven Elwood N7GXP N&S Dakota
44.116 Tom Kloos WS7S Oregon: NW&Portland,Vancouver WA
44.118 Carl Ingerson N1DXM Maine
44.120 unassigned
44.122 Dale Puckett K0HYD Kansas
44.123 Bernie McDonnell NP2W Virgin Islands
44.124 David Dodell WB7TPY Arizona
44.125.0-126 Earl Petersen KF7TI Southern Nevada
44.125.128-254 Bill Healy N8KHN Northern Nevada
44.126 Karl Wagner KP4QG Puerto Rico
#
# 44.128 is reserved for testing. Do not use for operational networks.
# You may safely assume that any packets with 44.128 addresses are bogons
# unless you are using them for some sort of testing
#
44.128 TEST
#
----
Top Of The Rock BBS - Lilburn, GA SYSOP: Steve Diggs
UUCP: totrbbs.atl.ga.us Snailmail: 4181 Wash Lee Ct.
Phone: +1 404 921 8687 Lilburn, GA 30247-7407
------------------------------
Date: 9 Aug 1994 09:39:34 -0400
From: noc.near.net!chaos.dac.neu.edu!not-for-mail@uunet.uu.net
Subject: IP address Help
To: ham-digital@ucsd.edu
I'll place the IP address coordination listing into the Boston Amateur
Radio Club archives on oak.oakland.edu.
It'll be in the /pub/hamradio/docs/misc directory under the title ip-coords
73,
Scott
--
Scott Ehrlich, Amateur Radio Callsign: wy1z wy1z@ka2jxi.ny [AX.25 Packet]
How to reach me: wy1z@neu.edu [Internet], wy1z@k2cc.ampr.org [TCP/IP Packet]
Boston ARC ftp archives: ftp oak.oakland.edu /pub/hamradio
Boston ARC Web page: http://www.acs.oakland.edu/barc.html
------------------------------
Date: 8 Aug 1994 18:15:29 -0700
From: ihnp4.ucsd.edu!galaxy.ucr.edu!library.ucla.edu!agate!barrnet.net!nntp.crl.com!crl3.crl.com!not-for-mail@network.ucsd.edu
Subject: Is this the place to talk DSP?
To: ham-digital@ucsd.edu
Allen Hall (ahall@ux4.cso.uiuc.edu) wrote:
: Hey guys,
: Just wondering if I should be cross-posting or just posting or what my
: home-brew questions (and technical q's about concepts) about DSP to
: digital.misc?
: Basically, I have come into the ownership of a very nice Analog Devices
: dsp chip, and I am working on making a DSP unit out of it. I am very very
: new to the concepts involved with DSP, and I need as much information as I
: can get.
: So far, I have been posting to .homebrew, but if you think I should post
: some here, please tell me, because I need all the help I can get!
: Thanks for you help and information!
: Allen Hall n9rzc@uiuc.edu
: ps- if you know where I can start, please e-mail me with
: comments/suggestions/ideas
: TNX et 73!
Allen,
Check the comp.dsp news group, it is all DSP.
Also, the faq is at:
evans.ee.adfa.oz.au:/pub/dsp/dsp-faq.help
If any more questions, email me.
Smitty, NA5K
--
Henry Smith (hbs@crl.com)
------------------------------
Date: 8 Aug 1994 23:08:06 -0500
From: cs.utexas.edu!natinst.com!not-for-mail@uunet.uu.net
Subject: local organizations that help people get acquainted with packet radio
To: ham-digital@ucsd.edu
I'm interested in getting involved in some packet radio and was wondering if
someone could tell me what local organizations that I might be able to get
involved in to meet people who are using this technology and would be
interested in introducing someone else to it.
Also I was wondering if directional dish antennas at the GHz frequencies
wouldn't be best to provide for reuse of bandwidth and use of less power.
Thanks.
mike
------------------------------
Date: 9 Aug 1994 00:38:04 -0400
From: newstf01.cr1.aol.com!search01.news.aol.com!not-for-mail@uunet.uu.net
Subject: Need Kam+ to HTX-202 Cable
To: ham-digital@ucsd.edu
I'm looking for a cable to match my Radio Shack 2meter rig
to my Kam Plus....
I'll gladly pay for one.
Matt/N8QNW
------------------------------
Date: 9 Aug 94 00:16:14 CDT
From: ihnp4.ucsd.edu!ucsnews!sol.ctr.columbia.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!newsfeed.ksu.ksu.edu!moe.ksu.ksu.edu!kuhub.cc.ukans.edu!christos@network.ucsd.edu
Subject: Need some help with the design of an Operational Amplifier
To: ham-digital@ucsd.edu
hello there,
I have a question concerning design of a simple amplifier using
operational amplifiers. I am simply designing a noninverting amplifier with a
gain of 2, that is R1=R2 ( Closed Loop Gain=(1+R2/R1) ). No matter what I apply
to the input of the amp the output always saturates to -11 Volts. Even if no
input is applied the output still gives a -11V.
The voltages that I am applying to the Vcc+ and Vcc- of the op amp are +12V and
-12V respectively. I am using the LM 741 opamp for this application.
Does anybody in this group happen to know what the problem might be?
I would appreciate any relevant response.
Please e-mail.
Thanks in advance
Chris
------------------------------
Date: Tue, 9 Aug 1994 00:28:51 GMT
From: newsflash.concordia.ca!nstn.ns.ca!cs.dal.ca!cfn.cs.dal.ca!aa770@uunet.uu.net
Subject: Recommendations on low-power TNC
To: ham-digital@ucsd.edu
Mark Cheeseman (cheese@active.asstdc.com.au) wrote:
: I'm looking for a TNC for portable field applications, so low power
: consumption is a primary consideration. Small physical size would
: The KPC-3 looks like it'll fit the bill, and the Tiny 2 might too,
: should be considering, or anything (bad) I should know about either
: Thanks in advance,
: Mark VK2XGK
Well Mark owning a KPC-3 I can attest that if you select the "leds off "
and setting "cd internal" the tnc does last a long time on 9 volts it
is quite capable of 3-5 day activity depending on how much you are
active. I would say your choice comes down to this if you have a full
laptop then a baycom would do the trick feeding off the computer if you
wanted more features such as mailbox without computer then the kpc 3 is
the way to go. 73's for now hope this helps (--
de VE1BT rob.....
: --
: Mark Cheeseman cheese@active.asstdc.com.au 712/412.0 [+61 2 314 6117]
: PO Box 1287 North Sydney NSW 2015 Ph +61 2 966 1722 Fax +61 2 955 8871
--
Robert Harpelle
Internet address aa770@cfn.dal.ns.ca
paket address VE1BT@#VE1BBS.NS.CA
Dartmouth, Nova Scotia, Canada
------------------------------
End of Ham-Digital Digest V94 #266
******************************