QRZ! Ham Radio 5/QRZ Ham Radio Callsign Database - Volume 5.iso/digests/digital/940291.txt

Internet Message Format | 1994-11-13 | 11.6 KB

Date: Thu,  1 Sep 94 04:30:19 PDT
From: Ham-Digital Mailing List and Newsgroup <[e-mail]>
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Subject: Ham-Digital Digest V94 #291
To: Ham-Digital


Ham-Digital Digest          Thu,  1 Sep 94       Volume 94 : Issue  291

Today's Topics:
                             56k modems?
                9600 baud using Kenwood TM201 & TM401
                    Balloon Flight Delay 'til OCT
                     Decoder with Grundig SAT 700
                     Packet Radio with apple LC ?
                            TM-451A Radio
                             TNC-2 Source
                      Unix vs DOS vs OS/2 vs NT

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Problems you can't solve otherwise to [e-mail].

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.
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Date: 30 Aug 1994 23:47:46 GMT
From: ihnp4.ucsd.edu!munnari.oz.au!yoyo.aarnet.edu.au!news.adelaide.edu.au![e-mail]
Subject: 56k modems?
To: [e-mail]

Steve Diggs ([e-mail]) wrote:
[stuff deleted]
:~available separately for $20 and we have a VHS (beta by special request)
                                             ^^^
:~Video tape featuring Dale Heatherington explaining the Beta modem design
:~for $20.
[stuff deleted]

VHS/PAL also ?

73 .. Rob
--
rob mayfield    senior technical analyst, australian submarine corporation p/l
[e-mail] vk5xxx@vk5xxx.#adl.#sa.aus.oc [phone]w

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Date: Wed, 31 Aug 94 08:16:59 EDT
From: ihnp4.ucsd.edu!dog.ee.lbl.gov!agate!howland.reston.ans.net!gatech!udel!news.sprintlink.net!mv!lmr![e-mail]
Subject: 9600 baud using Kenwood TM201 & TM401
To: [e-mail]

[e-mail] (Steve Diggs)  writes:

> I haven't given up completely. James Miller, G3RUH, has agreed to look
> at the schematics of this rig with ideas on ANY POSSIBLE way to make the
> rig work. Possibilities are to lengthen the RC time constant in the
> PLL's feedback curcuit, or perhaps modulate the master reference
> oscillator of the PLL, along with the Varactor. (To prevent the PLL from
> detecting a frequency drift) James just sent me a confirming note on
> 8/28 acknowledging receipt of the info package, and his intent to shart
> on the project in the near future.

I would definitely try first to lengthen the RC time constant in the PLL
feedback circuit, since that might be the easiest to do.

Larry W1HJF

-----------------------------------------------------------------------------
L. M. Rappaport &  Associates, Inc.   [e-mail]   voice [phone]
Colebrook, NH  03576-0158             CIS 72427,2567    fax   [phone]

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Date: 30 Aug 94 16:52:42 MDT
From: ihnp4.ucsd.edu!dog.ee.lbl.gov!news.cs.utah.edu!cc.usu.edu![e-mail]
Subject: Balloon Flight Delay 'til OCT
To: [e-mail]

Well...

For those who have been following the "progress" of the MARS
BALLOON PACKAGE (MBP) balloon flights it turns out that
Murphy has struck our ballooning efforts once again.

The balloon launch from the Logan, Utah airport was
a l m o s t a success.  The winds calmed down after a slight
delay, all hardware systems checked out and the super-
pressure balloon filled up with helium without a hitch.  But
during the launch one of the runners (a person who runs with
the payload to ensure that the payload doesn't drag along
the ground or hits an object in the payloads initial 5
second ascent) may have inadvertently "jarred" the payload
package that had caused a power fluctuation to occur.

This power fluctuation (momentarily off then on power state)
may have caused the release guillotines to fire which cuts a
support line from the balloon.  The balloon ascended to
approximately 150,000 feet when it burst, but without
measurements or telemetry to the ground and satellite since
that nasty constant called gravity caused the payload to
move in the opposite direction.

The next scheduled balloon flight will not be until October
I am told, but we promise to keep those of you interested
continually informed on this interesting experiment.

73's

-Dan
KA0EOF

Internet:      [e-mail]
Packet:        [e-mail]

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Date: Wed, 31 Aug 1994 00:38:32 -0400
From: newsflash.concordia.ca!altitude!interso.hip.cam.org![e-mail]
Subject: Decoder with Grundig SAT 700
To: [e-mail]

Which decoder can I use with a Grundig SAT 700?

Thanks for your help.

You can reply to
[e-mail]

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Date: 31 Aug 94 13:44:23 +1000
From: ihnp4.ucsd.edu!agate!msuinfo!harbinger.cc.monash.edu.au!newshost.anu.edu.au!sserve!hhcs.gov.au!cnb828.127.163.in-addr.arpa![e-mail]
Subject: Packet Radio with apple LC ?
To: [e-mail]

I have a LC III that I use for packet.

It's connected to the house Ethernet and runs;

MacTCP 2.04,
Fetch,
Anarchie,
NCSA Telnet,
MudDweller (Great for converse),
Gopher,
Mosaic,
Eudora and
Nuntius.

I've trialed Gopher and Mosaic over a 4800 baud radio link to the
local gateway and it worked but was very slow.  I run JNOS 1.10f as
the radio<->Ethernet gateway and provide POP3 and NNTP services for
myself and local amateurs.  I also talk CAP to my FreeBSD Unix box.

Fetch handles Amateur radio timings quite well as does NCSA Telnet
(v2.6).

Feel free to EMail me if you have any questions on the above.


Carl.
--
Carl Makin (VK1KCM)          "Speaking for myself only!"
[e-mail]      'Work [phone]'      Canberra, Australia
'The best book on programming for the layman is "Alice in Wonderland";
 but that's because it's the best book on anything for the layman.'

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Date: Wed, 31 Aug 1994 03:32:54 GMT
From: ihnp4.ucsd.edu!swrinde!gatech!newsxfer.itd.umich.edu!jobone!lynx.unm.edu!mack.rt66.com!kb5rtk.einet.com![e-mail]
Subject: TM-451A Radio
To: [e-mail]

Hello everyone,

       Does anyone know how the TM-451A Kenwood handels at 9600 baud? I am
using it packet here in Albuquerque but I am at 2400 baud because no one is on
at 9600 baud yet! I was wondering if it is in wide use yet and what promblems
I might (if any) face when I decide to make the jump!

Thanks!
Cliff Nail KB5RTK


___________________________________________________________________________
Cliff Nail
US - 227   USWA!!!!
KB5RTK - Ham radio on the water .....  There is no faster Ham on the water!
Internet - [e-mail]
Ham internet 44.30.0.54 (KB5RTK on 145.01 MHz - Albuquerque NM)

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Date: 31 Aug 1994 08:51:47 GMT
From: zib-berlin.de!news.belwue.de!news.uni-ulm.de!hermes!winx03!fiji![e-mail]
Subject: TNC-2 Source
To: [e-mail]

Rudi van Drunen ([e-mail]) wrote:
: HI all,

: I'm desperately looking for the Z-80 SOURCE CODE for the TNC-2, as I want
: source. If so, please share it with me ! thanks !!

... and maybe you will share it with other HAMs too!! mny tnx

--
Hans-Christoph Wirth                  [e-mail]
phone [phone]                  packet-radio: dg9nfe@db0fp.#bay.de.eu

------------------------------

Date: 31 Aug 94 14:28:18 GMT
From: [e-mail]
Subject: Unix vs DOS vs OS/2 vs NT
To: [e-mail]

Ray WD5IFS writes:
>      I use Unix, DOS (5.0), and Daytona (NT 3.5 beta) here.  Each has its
>      strengths and drawbacks.  I agree with Bill that Unix has the strength
>      of not allowing a user job to crash the system. HOWEVER, this only
>      applies to BIG machines like a VAX or HP 9000.  Most people who only
>      have access to small machines like a PC or Mac don't have this luxury.
>      Many of the Unix implementations don't have or use the MMU (memory
>      management unit) which gives Unix this capability.  I disagree that
>      DOS machines typically need to be rebooted several times a day.  What
>      needs to be rebooted are DOS/Windows 3.1/Lan Manager machines and it
>      is more like 10 times a day!

"HOWEVER, this only applies to BIG machines like a VAX or HP 9000." Wrong.
A lowly PC running LInux provides this same protection.

>      This is my current crusade.  If you want an OS that DOES NOT let user
>      jobs crash the OS it MUST HAVE an MMU.  I was quite surprised to learn
>      that Apple's System 7 apparently does not make use of an MMU.  The
>      result is that it is still possible to crash the OS even on a Mac.
>      Apparently this happens less often with the Mac because the software
>      is written better (I am not sure I believe this but it is possible).

"Apple's System 7 apparently does not make use of an MMU." Wrong again. You
don't fully understand the function of an MMU, else this statement and the
next I'll quote wouldn't have been said.

>      We have an on-going flame war here where I work of Motorola vs Intel.
>      My main complaint with the Motorola world (principly Mac's, but also
>      embedded OS's such as pSOS, OS9, and VRTX) is that they do not
>      implement memory protection by INSISTING on the presence of a hardware
>      MMU.

I'd bet all of the mentioned embeded OS's offer versions using the MMU the
way you seem to want. Mac System 7.x does use the MMU for virutal memory but
does not use it to protect applications from each other. This is the price
Apple paid to remain compatible with older Macs. And I have no doubt Mac
applications are better written and better behaved than Windows, as Mac
developers may scream about hardware changes from generation to generation
but as long as they stay within Apple's "Inside Macintosh" specification
they rarely get burned.

73, David Kelly, N4HHE
[e-mail]

------------------------------

Date: 31 Aug 1994 01:20:32 GMT
From: ihnp4.ucsd.edu!usc!elroy.jpl.nasa.gov!lll-winken.llnl.gov!taurus.cs.nps.navy.mil!nps.navy.mil![e-mail]
To: [e-mail]

References <[e-mail]>, <[e-mail]>, <[e-mail]>cs.n
Subject : Re: 1200/9600 Packet TNC

In article <[e-mail]>, [e-mail] (Cliff Nail   US - 227) says:
>The new Kenwood TM-451A is really sweet for 440 9600 baud!
>
>Cliff

But does the TM-451A tune down the the satellite band of 435 MHz?  It would be really nice to
know which (if any) of the new 9600bps ready radios, single or dual band, will tune down that
low.  It almost seems as if it was intentional that the radios _do not_ tune down that low so
as to preclude these radios for satellite use.

I know that my TR-851 has built in limitations in its design to go up to the 440-450 portion
of the band.  Perhaps the new radios cannot be designed to go any lower.

Cliff, could you comment on how a 9600bps modem interfaces to your radio?


Steve, N7HPR
[e-mail]
Naval Postgraduate School,  Monterey, CA 93943

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End of Ham-Digital Digest V94 #291
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