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1994-11-13
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21KB
Date: Fri, 17 Jun 94 04:30:17 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 #199
To: Ham-Digital
Ham-Digital Digest Fri, 17 Jun 94 Volume 94 : Issue 199
Today's Topics:
FCC to rule on HF forwarding
Ham-Digital Digest V94 #198
Kudos to AEA on PK-232/TS-450 Interface
Railroad track as an antenna? (2 msgs)
Standard Digital Radio Interface Proposal (long)
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: 16 Jun 94 23:46:37 GMT
From: news-mail-gateway@ucsd.edu
Subject: FCC to rule on HF forwarding
To: ham-digital@ucsd.edu
Report No. DC-2613 ACTION IN DOCKET CASE June 15, 1994
AUTHORIZATION OF AUTOMATIC CONTROL FOR HF DIGITAL COMMUNICATIONS
IN AMATEUR SERVICE PROPOSED
(PR DOCKET 94-59)
The Commission has proposed amending the amateur service
rules to authorize automatic control of stations transmitting a
digital emission on the High Frequency (HF) amateur service
bands.
This action was requested in petitions filed by The American
Radio Relay League, Inc. (ARRL), and the American Digital Radio
Society, Inc. (ADRS)
The propagation characteristics of the HF bands allow for
long distance communications. Amateur operators take advantage of
these characteristics to communicate with other amateur stations
all over the world. Establishing and maintaining a HF
communications link, however, presents operating demands not
encountered on the Very High Frequency (VHF) and higher frequency
bands. The variables affecting communications in the HF bands
are highly complex. To maintain the communications link and
avoid causing interference to the communications of other amateur
stations, the control operator constantly monitors the activity
on the channel being used and adjusts the station's transmitting
parameters as needed. Because the presence of the control
operator has been necessary for proper operation in these
systems, automatic control of an amateur station that is
transmitting on any HF band or on the 160 meter MF (medium
frequency) band has not been authorized.
In 1986 the Commission authorized automatic control of
amateur stations transmitting digital communications on the VHF
and higher frequency bands and indicated it was interested in
authorizing automatic control of stations using the HF bands.
To determine solutions to the problem of avoiding
interference from automatically controlled HF digital stations
the ARRL conducted a successful feasibility project under special
temporary authority the Commission granted to 50 amateur
stations. The ARRL's petition is based on the results of that
study. The ADRS's petition contained an additional
recommendation from amateur operators who have been experimenting
for several decades with digital communications on the HF bands.
The Commission said it was gratified by the cooperation and
dedication of organizations within the amateur service community
in determining the conditions necessary to allow automatic
control of stations transmitting data and RTTY (narrow-band
direct printing) emission types on the HF amateur service bands.
It agreed with the petitioners that automatic control of amateur
stations in the HF bands can, with safeguards, make the
transmission of data and RTTY emission types practical and
effective.
Therefore, the Commission proposed to authorize automatic
control for stations transmitting data and RTTY emission types on
one specific subband of each HF band where such emissions are
authorized. It also proposed to authorize communications between
a locally or remotely controlled station and an automatically
controlled station on any frequency where data and RTTY emission
types are otherwise authorized.
The Commission said that it firmly believes in the principle
that government should be responsive to user needs. It noted
that the rules it proposed were the result of a successful
feasibility project planned and carried out within the amateur
service community and represent the recommendations of two
organizations dedicated to bringing the benefits to be derived
from the transmission of digital communications on the amateur
service HF bands to amateur operators in the United States and
elsewhere without causing unnecessary interference to other types
of communications.
Action by the Commission June 13, 1994, by Notice of
Proposed Rulemaking (FCC 94-171). Chairman Hundt, Commissioners
Quello and Barrett, with Commissioners Ness and Chong not
participating.
- FCC -
News Media contact: Rosemary Kimball at (202) 418-0500.
Private Radio Bureau contact: William T. Cross at (202) 632-4964
------------------------------------------------------------------------
This message forwarded by TAPR
Tucson Amateur Packet Radio
8987-309 E Tanque Verde Rd #337 * Tucson, Az * 85749-9399 * 817-383-0000
------------------------------
Date: 16 Jun 94 18:58:45 GMT
From: news-mail-gateway@ucsd.edu
Subject: Ham-Digital Digest V94 #198
To: ham-digital@ucsd.edu
If I don't post to the list How DO I get info back? What is a list for anyway?
Ken
>>RVGC2@VTVM1.CC.VT.EDU<<
>>PHONES 703-857-7584 >>VATECH CAMPUS 13855<<
>>FAX 703-857-7371<< KEW6X@POE.ACC.VIRGINIA.EDU >>
>>ARMY MARS AAT3PK/VA<< AMATEUR>N4LYO<<
>>IBMMAIL (USVPITMA)<<
ROANOKE VALLEY GRADUATE CENTER
US SNAIL: 117 W. CHURCH AVE.
ROANOKE, VA. 24011-1905
------------------------------
Date: 16 Jun 1994 14:03:34 -0500
From: ihnp4.ucsd.edu!swrinde!cs.utexas.edu!geraldo.cc.utexas.edu!austin.lockheed.com!kestrel.austin.lockheed.com!not-for-mail@network.ucsd.edu
Subject: Kudos to AEA on PK-232/TS-450 Interface
To: ham-digital@ucsd.edu
Ref: My (kd5vu) posting "Wimpy AFSK Output TS-450S"
First, the problem is HISTORY and the TS-450 and PK-232 are working great.
The following are my notes on how to interface a PK-232MBX to a TS-450S/AT
for FSK Operation. These notes are based on tips and notes from Richard
Stuart,
WF7A, from AEA. Richard really helped and I appreciate AEA's technical support
to old customers as well as new customers. BUY AEA products!
You need two wires from the PK-232 (from J7 and J7) to one ACCY2
port on the TS-450S/AT. The following are the connections:
PK-232MBX to TS-450S via ACC-2 Connector for FSK
PK-232 (J-6) TS-450S/AT (ACCY-2)
============ ============
Pin 5 RED PTT Pin 9 PTT
Pin 4 BROWN GND Pin 8 GND
Pin 3 BLACK - Not Used
Pin 2 WHITE AFSK-OUT Not Used
Pin 1 GREEN AFSK-IN Pin 3 AFSK-OUT
Shield Pin 12 GND
PK-232 (J-7) TS-450S/AT (ACCY-2)
============ ============
Pin 4 FSK-R Pin 2 RKT
Pin 2 GND Pin 12 (shield)
Forget about even trying to run the TS-450 in AFSK. Go FSK
and you will not have problems. The TS-450 is hosed for AFSK.
Don't waste your time or money on a phone call to Kenwood for help.
If you have a TS-450, I suggest you SAVE this message.
Dick Kriss, KD5VU
On: 6/16/94 2:07:55 PM CST
=====================================================================
Richard (Dick) Kriss E-Mail:kriss@austin.lockheed.com
904 Dartmoor Cove Packet Radio: SP KD5VU @ N5LJF.#AUS.TX.USA.NA
Austin, Texas 78746 Phone: 512-386-4153 (day) or 327-9566 (evenings)
AMPRnet: kd5vu@kd5vu.ampr.org
My employer has nothing to do with this message! ... _._
=====================================================================
------------------------------
Date: 16 Jun 94 16:33:28 GMT
From: ihnp4.ucsd.edu!swrinde!howland.reston.ans.net!europa.eng.gtefsd.com!newsxfer.itd.umich.edu!newsrelay.iastate.edu!news.iastate.edu!jvp@network.ucsd.edu
Subject: Railroad track as an antenna?
To: ham-digital@ucsd.edu
In <jfhCrHvnC.Gz8@netcom.com> jfh@netcom.com (Jack Hamilton) writes:
>s9898198@sandcastle.cosc.brocku.ca (STORM JAMES) wrote:
>>I have heard a legend that a college radio station (either at MIT, Tufts,
>>or Swarthmore) welded antenna to railroad tracks, and peeved the FCC by
>>broadcasting nationwide. Is this true? If anyone knows, please email me
>>(or post here) If you do know, could you please direct me to some
>>documentation regarding this legend if you can.
>Seems unlikely. The railroad system is not one giant circuit. There are
>breaks everywhere.
Plus wouldn't it be grounded at points? I don't know if insulating
the tracks is a design criterion. This would make it even more unlikely.
+---------------------------------------------------------------+
| Jim Van Peursem - Ph.D. Candidate (Ham Radio -> KE0PH) |
| Department of Electrical Engineering and Computer Engineering |
| Iowa State University - Ames, IA 50011 : (515) 294-8339 |
| internet - jvp@iastate.edu -or- jvp@cpre1.ee.iastate.edu |
+---------------------------------------------------------------+
------------------------------
Date: 16 Jun 94 10:48:46 -0700
From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!europa.eng.gtefsd.com!newsxfer.itd.umich.edu!nntp.cs.ubc.ca!mala.bc.ca!wagner@network.ucsd.edu
Subject: Railroad track as an antenna?
To: ham-digital@ucsd.edu
In article <jfhCrHvnC.Gz8@netcom.com>, jfh@netcom.com (Jack Hamilton) writes:
> s9898198@sandcastle.cosc.brocku.ca (STORM JAMES) wrote:
>>I have heard a legend that a college radio station (either at MIT, Tufts,
>>or Swarthmore) welded antenna to railroad tracks, and peeved the FCC by
>>broadcasting nationwide. Is this true? If anyone knows, please email me
>>(or post here) If you do know, could you please direct me to some
>>documentation regarding this legend if you can.
>
> Seems unlikely. The railroad system is not one giant circuit. There are
> breaks everywhere.
>
> --
>
> --------------------------------------------------------------------
> Jack Hamilton jfh@netcom.com packet: kd6ttl@n0ary.#nocal.ca.us.na
Modern railays use "block control/detection" for location of trains. This
system relies on the the fact that a railroad train can be a moving short
circuit. This fact is detected for block detection and to signal level
crossings of the presence of trains. To do this the rail system is delib-
erately insulated into sections. A low voltage bridge circuit is used to
detect the short between the two tracks. The reason a bridge is used is
to compensate for ground leakage due to wet ties.
A stretch of track behind your house might make a great shortwave recieving
antenna but it would be a real bugger to load!
BTW track maintenance gear has insulated wheels so that they don't trip the
detection circuitry.
--
____________ ____________ ____ _____
/_____ ____/ / _______ / / \ ,' /
/ / / / / / / /\ \ ,' ,'/ /
/ / / / / / / / \ \,' ,' / /
/ / / / / / / / \ ,' / /
/ / / /______/ / / / \,' / /
/__/ /___________/ /__/ /_/
_____________________________________________________
/____________________________________________________/
Proud owner of a dog, cat, bird, old Tractor and a British
Car "If Lucas Electric made guns wars wouldn't start"
------------------------------
Date: Thu, 16 Jun 1994 15:43:19 GMT
From: ihnp4.ucsd.edu!swrinde!emory!cs.utk.edu!stc06r.CTD.ORNL.GOV!ornl!xdepc.eng.ornl.gov!wyn@network.ucsd.edu
Subject: Standard Digital Radio Interface Proposal (long)
To: ham-digital@ucsd.edu
In article <jra1854.1122163943A@news.tntech.edu> jra1854@tntech.edu (Jeffrey Austen) writes:
>Here is an article which was just published in PSR. Comments?
>A Proposal for a Standard Digital Radio Interface
>The physical connector selected is a high-density 15-pin D-series
>connector. This connector is small enough to be used on mobile and
[stuff deleted]
In all of the rambling I lost track of how many of the 15 pins would be used
and how many would be spares. Some ASCII art would be helpful here. Anyway,
make sure there are plenty of spares even if you need to go to the 25-pin D
series. Straight through DB 25 modem cables are plentiful and cheap. While
the author said future growth was being taken care of, I did not see mentioned
some of the future features that have been discussed here, such as automatic
adaptive control (power, bandwidth, frequency, cellular like), which will
require more parallel circuits between the TNC and DR.
73,
C. C. (Clay) Wynn N4AOX
wyn@ornl.gov
=========================================================================
= Cooperation requires participation. Competition teaches cooperation. =
=========================================================================
..._ .. ..._ ._ _ . ._.. . __. ._. ._ .__. .... _.__
------------------------------
Date: Thu, 16 Jun 1994 20:03:56 GMT
From: ihnp4.ucsd.edu!swrinde!cs.utexas.edu!utnut!nott!cunews!news@network.ucsd.edu
To: ham-digital@ucsd.edu
References <2tklvo$7e5@gopher.cs.uofs.edu>, <2tn8p0$7b@abyss.West.Sun.COM>, <2tq2jv$sa4@freenet3.scri.fsu.edu>ⁿ
Subject : Re: An open note to Gary Coffman, KE4ZV
>: There's a big difference between a 56kb/s full-duplex landline
>: connection and 56kb/s amateur half-duplex packet.
>We cn do full duplex cross-band. And if it is through a repeater the
>user only needs a receiver for 1 of the bands. This could be a $100 or less
>scanner for 440 MHz.
I don't really think you could use a scanner for 56 kbps rx. More like
a demodulator and a downconvertor. However, since the Hamtronics
downconverter is only about $50 to 75 it's still pretty cheap.
The trick is that full duplex really doesn't buy you much improvement
in performance, for a multi-user network. If you are all sharing
the network, then you have to take turns transmitting. Full
duplex will allow you to determine if you have collided with anohther
transmitter and thus stop transmitting sooner and free the channel
quicker. If however, you want to do something like a multi-point
video conference using something like CUSeeME full duplex would
not buy you as much as increasing your data rate by 3 or 6 db:-)
Full duplex repeater is a must, but half duplex user stations
are not really that much worse off from full duplex user
stations. Fast aquisition, and lock up time of demods would
also probably buy you more improvement than full duplex user
stations. A nit with the GRAPES-WA4DSY modem, mine needs about
10 or so mSec preamble or it starts loosing lots of packets.
A couple of the guys here have modified the PLL's to bring it
down in the 2 mSec range though.
56 kbps is cool but getting old. With applications like Mosaic,
CUSeeMe, and other interactive whiteboard sorts of software
out there - 56 kbps seems like 1200 baud did 7 years ago when
I got my first TNC .. neat but too slow. It's time to start
pushing the envelope some more ... What is needed now is a cheap
easy to build and align 1 Mbps+ modem!
im
--
Ian A. McEachern, VE3PFH | This space for rent.
Packet Working Group, Ottawa A.R.C. |
im@hydra.carleton.ca |
ian@ve3pfh.ampr.org |
------------------------------
Date: Thu, 16 Jun 94 22:17:53 -0500
From: news.delphi.com!usenet@uunet.uu.net
To: ham-digital@ucsd.edu
References <1994Jun12.140915.1245@ke4zv.atl.ga.us>, <wb6wCrB332.H3o@netcom.com>, <1994Jun13.124359.5359@ke4zv.atl.ga.us>
Subject : Re: info wanted: new Kantronics 9k6 modem
Hi. I've just joined Internet through Delphi and noticed the comments on the
KPC-9612 (new Kantronics 9600/1200 TNC). I don't know how often I'll be on here
but I am the Test Engineer for Kantronics. The new KPC-9612 is not a G3RUH
clone, it's an MXCOM chip (MX589 to be exact). The HDLC is done if firmware,
as most of the Kantronics TNCs are. The Data Engine is the one exception
with an 85C30 SCC doing the dirty work.
The new KPC-9612 is fully compatible with the G3RUH systems, and I've been
testing it on the air against the Data Engine. The KPC-9612 has been connected
to many different types of radios and works well with most of them. All of the
new generation radios exhibit a slightly long TXD, but they are fully
synthesized units.
I'm hesitant to give pricing here, but the paperwork for FCC certification is
on someone's desk in Washington, and as soon as it comes back, the unit will
be shipping. Hopefully that will be around July 10 or earlier.
Hope that helps.
73, Karl - WK5M @ WK5M.#NEKS.KS.USA.NOAM (no business packet mail please!)
------------------------------
Date: 16 Jun 1994 13:37:03 -0400
From: ihnp4.ucsd.edu!usc!cs.utexas.edu!utnut!nott!cunews!freenet.carleton.ca!freenet3.scri.fsu.edu!freenet3.scri.fsu.edu!not-for-mail@network.ucsd.edu
To: ham-digital@ucsd.edu
References <CrEA75.147@sfu.ca>, <2tklvo$7e5@gopher.cs.uofs.edu>, <2tn8p0$7b@abyss.West.Sun.COM>enet3
Subject : Re: An open note to Gary Coffman, KE4ZV
Dana Myers (myers@bigboy.West.Sun.COM) wrote:
: There's a big difference between a 56kb/s full-duplex landline
: connection and 56kb/s amateur half-duplex packet.
We cn do full duplex cross-band. And if it is through a repeater the
user only needs a receiver for 1 of the bands. This could be a $100 or less
scanner for 440 MHz.
: I for one think it would be the cat's meow to build a fast, wide area
: network on radio. I mean, people like MCI, ATT, and others have shown
: us how.
--
Bruce M. Marshall bmm1@freenet.fsu.edu voice 615 481 0990 fax 615 481 8039
------------------------------
Date: Fri, 17 Jun 94 03:19:38 GMT
From: ihnp4.ucsd.edu!swrinde!gatech!newsxfer.itd.umich.edu!zip.eecs.umich.edu!yeshua.marcam.com!news.kei.com!ub!galileo.cc.rochester.edu!uhura.cc.rochester.edu!fval_ltd@network.ucsd.edu
To: ham-digital@ucsd.edu
References <1994Jun16.065537.28157@spartan.ac.brocku.ca>, <jfhCrHvnC.Gz8@netcom.com>, <1994Jun16.104846.4325@mallrc.mala.bc.ca>i.co
Subject : Re: Railroad track as an antenna?
In <1994Jun16.104846.4325@mallrc.mala.bc.ca> wagner@mala.bc.ca (TOM WAGNER, Wizzard of old Audio/Visual Equipment........Nanaimo Campus) writes:
>Modern railays use "block control/detection" for location of trains. This
>system relies on the the fact that a railroad train can be a moving short
[crunch]
>BTW track maintenance gear has insulated wheels so that they don't trip the
>detection circuitry.
Just to note, the block system isn't really modern. Been around for almost
100 years, i believe. Want to say since 1868, but not sure (hey, if they
could have fax machines back then, I am sure they could do block control)
Certain RRs do mandate that maintenance equip not shunt the track, while
others require it. I think Union Pacific now has equipment that shunts the
tracks since it is a bit safer in teh long run. The Burlington Northern
doesn't, tho I met one guy whos vehicle shunted the track if he steped on
the brakes and gas at the same time or so -- advantageous for tripping
crossing guards, etc.
trey
--
trey valenta fval_ltd@cc.rochester.edu
189 milburn street apt #8 N2WJU
rochester ny 14607 716.242.9008
Post No Bills
------------------------------
End of Ham-Digital Digest V94 #199
******************************