QRZ! Ham Radio 3/QRZ Ham Radio Callsign Database - Volume 3.iso/digests/infoham/940076.txt

Internet Message Format | 1994-06-04 | 31KB

Date: Wed, 26 Jan 94 01:43:56 PST
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Subject: Info-Hams Digest V94 #76
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Info-Hams Digest            Wed, 26 Jan 94       Volume 94 : Issue   76

Today's Topics:
                Amateur Radio Newsline #858  21 Jan 94
                             Famous hams
                               LA Comms
                 MFJ's 20m SSB Travel Radio: No RIT?!
                               RAC Logo
                          TF3CW QSL address
            WWCR 5.810MHZ 8pm 12pm Eastern(CHECK IT OUT!!)

Send Replies or notes for publication to: <[e-mail]>
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Problems you can't solve otherwise to [e-mail].

Archives of past issues of the Info-Hams Digest are available
(by FTP only) from UCSD.Edu in directory "mailarchives/info-hams".

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: Mon, 24 Jan 1994 06:56:24 -0700
From: usc!yeshua.marcam.com!zip.eecs.umich.edu!destroyer!nntp.cs.ubc.ca!alberta!ve6mgs![e-mail]
Subject: Amateur Radio Newsline #858  21 Jan 94
To: [e-mail]

The electronic publication of the Amateur Radio Newsline is distributed
with the permission of Bill Pasternak, WA6ITF, President and Editor of
Newsline.  The text is transcribed from the audio service by Dale Cary and
is first published on Genie.

Editorial comment or news items should be E-mailed to [e-mail]
or [e-mail]. Voice or FAX to [phone].

All other information and disclaimers are in the text header below.

 - - - - -

 NEWSLINE RADIO - CBBS EDITION #108 - POSTED 01/22/94

 *****************************************************************
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 *       **  * *     *    * *     *       *   **  * *            *
 *       * * * ***   * ** *  ***  *       *   * * * ***          *
 *       *  ** *     * ** *     * *       *   *  ** *            *
 *       *   * *****  *  *  ****  ***** ***** *   * *****        *
 *                                                               *
 *                 ****    *   ****  *****  ***                  *
 *                 *   *  * *  *   *   *   *   *                 *
 *                 ****  ***** *   *   *   *   *                 *
 *                 *  *  *   * *   *   *   *   *                 *
 *                 *   * *   * ****  *****  ***                  *
 *                                                               *
 *****************************************************************

    The following is late news about Amateur Radio for Radio
 Amateurs as prepared from NEWSLINE RADIO scripts by the staff of
 the AMATEUR RADIO NEWSLINE, INC. -- formerly the WESTLINK RADIO
 NETWORK.  The electronic version of newsline is posted on this
 CBBS twice monthly.  For current information updates, please call

      Los Angeles............................ [phone]
      Los Angeles (Instant Update Line)...... [phone]
      Seattle................................ [phone]
      Seattle................................ [phone]
      Tacoma................................. [phone]
      Louisville............................. [phone]
      Dayton................................. [phone]
      Chicago................................ [phone]
      New York City.......................... [phone]
      Melbourne, FL.......................... [phone]

    For the latest breaking info call the Instant Update Line listed
 above.  To provide information please call [phone].  This
 line answers automatically and will accept up to 30 minutes of
 material.

    Check with your local amateur radio club to see if NEWSLINE
 can be heard weekly on the air in your area.

    Articles may be reproduced if printed in their entirety and
 credit is given to AMATEUR RADIO NEWSLINE as being the source.

    For further information about the AMATEUR RADIO NEWSLINE,
 please write to us with an SASE at P.O. Box 463, Pasadena, CA
 91102.

                                              Thank You
                                              NEWSLINE

 *****************************************************************

 Some of the hams of NEWSLINE RADIO...

 WA6ITF WB6MQV WB6FDF K6DUE W6RCL N6AHU N6AWE N6TCQ K6PGX N6PNY
 KU8R N8DTN W9JUV KC9RP K9XI KB5KCH KC5UD KC0HF G8AUU WD0AKO DJ0QN
 and many others in the United States and around the globe!!!

 *****************************************************************

 [858]

 * * * *   C L O S E D   C I R C U I T   A D V I S O R Y   * * * *
 *                                                               *
 *     The following is a closed circuit advisory and is not for *
 *  air over ham radio.  Repeat, not for broadcast. This is just *
 *  a reminder that the address for the Newsline Support Fund is *
 *  Newsline, in care of Dr. Norm Chalfin, K6PGX, Post Office    *
 *  Box 463, Pasadena, CA 91102.  Again, and as always, we thank *
 *  you.  That ends the closed circuit with Newsline report      *
 *  number 858 for release on Friday January 21, 1994.           *
 *                                                               *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *


                     The following is a QST

    Californians are awakened to one of the biggest quakes in
 history.  As usual, Amateur Radio plays a key role in health and
 welfare.

 *****
                      CALIFORNIA QUAKE '94

    At 4:31 am a tremor of tremendous magnitude rocked the Los
 Angeles basin.  Almost immediately, communications in and out of
 the nations second largest city became nearly impossible.  Phone
 networks and other traditional means of communications became
 overloaded and useless.  But, as usual, years of training
 resulted in amateur radio coming to the rescue in one of the most
 heroic stories in the history of our hobby.
    "The wake up call came at 4:31 am last Monday morning and
 within seconds Los Angeles area hams had already swung into
 action.  The quake was centered in the San Fernando Valley just
 northwest of Los Angeles.  First came the work of the Public
 Seismic Network.  A collection of hams and amateur seismologists
 who meet weekly on the air to compare data collected against
 actual seismic events.  When an area event occurs, they collect
 felt reports on the air.  And can often locate the general area
 of the quake within minutes by this method.
    Handling this flood of calls, some under very difficult
 conditions, was Dorothy Darby, N6ZNC.  Within the first half hour
 following the quake the Los Angeles RACES Organization known as
 the Disaster Communications Service was on the air from many of
 the Sheriffs stations in the area.  Providing interagency
 communications between county sheriff, fire and the city
 organizations, as well as area hospitals and shelters.  This
 reporter being the District Communications Officer for the
 Cresenta Valley Sheriffs Station was kept busy providing
 operators for that location which works with the cities of
 Pasadena, Glendale, and Burbank.  The Glendale operators had
 their own set of problems, as the parking structure at the police
 station, where the emergency operations center is located, had
 collapsed destroying a number of city vehicles in the process.
    The hams responding to the city of San Fernando facility found
 it without power mains and generator power.  And ended up rigging
 a handheld to the stations rooftop antenna.  As we go to air hams
 are still on duty throughout the Los Angeles Basin keeping the
 lines of communications open.  And this particular ham got
 reminded on more than one occasion of his phonetics, Tiny
 California Quake."  Andy Jarema, K6TCQ.

   "Santa Clarita, CA, a city that few of you had heard of until
 now, when this quake put it on the map.  This is a community that
 has been cut off from the rest of Los Angeles after the collapse
 of the Highway 14 overpass onto Interstate 5.  There was no power
 for twenty one hours.  Telephone service, especially out of state
 calling is still sporadic.  Except for ham radio, Santa Clarita
 was a community isolated from the city to the south.
    I got a chance to see the devastation of the Northridge quake
 first hand as I drove into work on Tuesday afternoon.  A trip
 that normally takes only 40 minutes dragged on for the better
 part of four and a half hours.  As I sat bumper to bumper on a
 single lane road that parallels Interstate 5, the destructive
 force of this quake was evident to everywhere you looked.
 Highways torn apart. Twisted rebar.  Mashed concrete.
    But we Angrlenos seem to accept this type of natural fury as
 being a part of the price we have to pay to live here.  So, as I
 inched my way into the city I also scanned the three most
 heavily used VHF and UHF bands in the area.
    Many repeaters normally alive with chatter were silent. They
 were victims of being on remote mountaintops that had lost
 power.  But other channels were alive.  Repeaters whose owners
 had been smart enough to install battery or solar power to take
 over when city power failed.  Each was loaded with some sort of
 quake related traffic. 147.705 was dedicated to working with the
 Red Cross and still is.  146.79 was holding forth with Santa
 Clarita Valley Emergency Communications.  224.52 and 224.58 were
 providing road closure information.  224.52 was also making its
 autopatch available for health and welfare calls.  The number of
 repeaters taking part is list far to long to report here.  These
 are just a few that I heard personally.
    Later in the afternoon I used the ham station at work to scan
 the high frequency bands.  Emergency communications nets were
 everywhere on 75, 40 and 20 meters.  Most were associated with
 the ARRL'S Amateur Radio Emergency Service.  Each was handling a
 myriad of health and welfare messages into and out of the Los
 Angeles Metro Area.
    As we go to air, many of these nets are still on the air.
 Telephone service is returning to normal and many amateur radio
 assistance operations will soon be winding down.  But the ongoing
 aftershocks of the Northridge quake are a constant reminder of
 what it costs to live here in the southland, and it's why being a
 ham can be vital to your very survival." Bill Pasternak, WA6ITF.
    As we go to air, the California earthquake story is still
 emerging.  We'll keep you updated in future Newsline reports.

 *****
       AMSAT-NA OPPOSES FCC "INSTANT LICENSING" PROPOSAL

    AMSAT-North America says it does not want to see an instant
 ham license in the United States.  The ham radio space research
 organization has filed comments with the FCC in opposition to the
 instant licensing proposal contained in a Notice of Proposed Rule
 Making, PR Docket 93.267.
    Under the FCC's proposal, unlicensed persons who pass an
 amateur license examination for the first time would immediately
 be permitted to operate for up to 120 days.  This, using
 self-assigned call signs, while waiting for their licenses to
 arrive.
    But in its opposition filing, AMSAT cited the potential for
 abuse by persons who have no intention of taking a ham radio test
 and want to be able to bootleg without being noticed.  It also
 says that it will be impossible to verify the self-assigned calls
 since they would not be registered in any data base.
    AMSAT very strongly believes that the guaranteed anonymity of
 a self-assigned call sign system would multiply the potential for
 interference by unlicensed persons with amateur radio operation.
 This the organization says is particularly relevant to the
 Amateur satellite service because the 2-meter, 10-meter and 70-cm
 bands, which presently contain the most popular satellite uplinks
 and downlinks, are also among the most likely to be affected by
 such interference.  They say that the international nature of ham
 radio satellite operation means that problems could be caused for
 amateurs, and governmental authorities, in other countries as
 well as in the United States.
    As an alternative to instant licensing, AMSAT urges the FCC to
 pursue the use of electronic filing and processing of amateur
 license applications.  This is the same position that has been
 taken by the American Radio Relay League.

 *****
                         ARRL BOARD MEETS

    The American Radio Relay League's Board of Directors is
 holding its first annual meeting of 1994 in a very chilly
 Hartford, Connecticut as this newscast is going to air.  The
 board is expected to take action on a number of important matters
 including the FCC proposal for a vanity call sign assignment
 system.  Tune into Newsline for a full report on ARRL board
 actions next week.

 *****
                        VANITY CALL DOCKET

    The text of the NPRM in Personal Radio Docket 93-305, dealing
 with the Commission's proposed Vanity Call Sign program, is
 available electronically on America Online, Compuserve, Genie,
 BIX and the National Video Network.  On most of these services
 the file is named vanity with a possible file extension
 designator attached.
    The same information is also available over Internet from the
 ARRL information file server.  To obtain it, simply send a
 message over Internet to infoarrl.org that says only send FCC-93-
 305.  That's infoarrl.org and the message must only read SEND
 FCC-93-305.
    The file is also available for downloading from the ARRL
 bulletin board at 203-666-0578 with the file name vanity.  It
 will be printed in February issue of QST magazine.

 *****
                             STROKE CW

    When a ham in Fargo, North Dakota suffered a stroke, he lost
 almost all ability to communicate.  His voice was gone, and he
 was immobilized.  But he could tap out morse code with his finger
 and that gave him hope.  It became the job of Paul Linnell, WQ0M
 to make known the thoughts and needs of Kurt Hall, W0AZV.
   "The first time I was up to see him we tried communicating by
 having Kurt tap out CW on my hand and on my arm and also by
 trying to squeeze my hand.  Because he was so weak, it was very
 difficult to make a whole lot of sense out of the CW that he
 sending, but he did let us know that he could communicate.
   So my second trip up I brought along a straight key and a
 little oscillator.  I knew we were in for a problem when Kurt,
 when he got a hold of the key wanted to move it sideways.  I then
 thought he was used to a bug.  He immediately sent out the word
 bug on the straight key so I knew we were going to have some
 problems.  Kurt is right handed and here he was laying in the
 hospital bed tying to send with his left hand.  Also being very
 weak from the stroke and he was still able to send my call and
 his call.  And even when I left that day sent 73 so when knew he
 was able to communicate."  Paul Linnel, WQ0M.
    Newsline joins with the amateur radio community of Fargo,
 North Dakota a full and speedy recovery.

 *****
                    ISRAEL ACCEPTS CEPT LICENSE

    From overseas,  word that Israel has joined the move toward a
 world-wide universal ham radio license.  IK1PHC reports that the
 Israeli Ministry of Post and Telecommunications has accepted
 CEPT recommendation TR 61-01.  This means that any ham who holds
 a license in any nation that is a signatory to the CEPT agreement
 can freely operate an amateur station in Israel without asking
 for a reciprocal permit.  No effective date of the change has
 been announced.

 *****
                          UK SCANNER STING

    For the second time in less than a year, authorities in the
 United Kingdom have again tuned the tables on scanner enthusiasts
 who eavesdrop on emergency service radio channels.  This, by
 issuing a false distress call and then arresting those who showed
 up on the scene.
    As 1993 drew to a close South Yorkshire police launched the
 undercover sting after finding evidence that criminals were
 cashing in on information that they intercepted over the
 airwaves.  As they did last spring, police dispatchers broadcast
 a phony report that aliens were invading earth and had been
 spotted in a nearby town.  Yes, aliens, as in little green men
 from Mars, and the like.
     Anyhow, reports are that several people who showed up at the
 address given in the bulletin.  They were arrested at the scene
 and charged with acting illegally on information broadcast in an
 official police radio channel.
    Under British law it is not illegal for scanner buffs to
 eavesdrop on emergency communications.  It is against the law to
 take any action based on any information that might be heard.
    A similar sting last year in central London netted more than a
 dozen scanner addicts who showed up at the site of another
 supposedly downed alien spaceship.  All were forced to pay heavy
 fines and a few of them actually did jail time.

 *****
                      AMSAT AUSTRIA TO MEET

    The first ever meeting of AMSAT-Austria will take place
 Saturday, April 16th at the Technical High School of Electronic
 and Telecommunication in Innsbruck.  The main goals of the
 gathering are to present papers about basic amateur satellite
 technology along with seminar sessions dealing with modes-s
 operation, analysis of telemetry and other assorted topics.  The
 preliminary list of lecturers includes I2KBD, ON6UG, DG2CV,
 OE1VKW and OE1WDC.  All satellite users are welcome to attend
 this one-day meeting.  For further information you can contact
 OE7FTJ at his callbook address.

 *****
                    SUPERBALL RISES, THEN FALLS

    Superball 94, the Utah balloon carrying amateur radio
 telemetry and an amateur television camera had a life of about
 three hours.  The launch of Superball took place Friday, January
 7th, at 16:26 UTC.  The balloon initially headed northeast as
 expected.  Telemetry was copied on both 2 and 15 meters, and ATV
 sent back video of the balloon.
    But then Superball began to change course as it came out of
 the Troposphere.  At about 18:04 UTC the balloon unexpectedly
 burst.  A quick drop in the differential pressure from 1.11 to
 1.03 was one of the first clues that something had changed
 radically.  Hams in eastern Utah actually watched the rupture on
 ATV and later saw the parachute deploy.  Telemetry on 15 meters
 was copied in Ohio with an signal report of 579 after the
 package came to rest.
    The landing site is in Utah's Uinta Mountains in the
 neighborhood of Wolf Creek Summit, a 9500-foot pass.  Plans are
 to locate and retrieve the payload with the help of snowmobiles
 and the Wasatch County Search and Rescue Team as weather permits.

 *****
                           LA BEACON OUT

    In DX, several sources report that the LA7DFA beacon has not
 been active from Jan Mayen since last April.  LA7DFA himself
 says that he is looking for a rig to install permanently as
 beacon transceiver at the club station.  He says that they also
 need a linear and a rugged yagi for the bad weather.  LA7DFA
 plans to return to there in April 94 and hopes to have this
 equipment to take with him.

 *****
                               GHANA

    Also, XT2BW is now active from Burkina Faso but will be
 leaving at the end of January to spend a few months on vacation
 with his family in Ghana.  He says that he will apply for a
 licence and will be active when time permits.  QSL him via
 WB2YQH.

 *****
                               GORDO

    Famed ham radio instructor Gordon West, WB6NOA, says that he
 is now available to speak at your club meeting, hamfest, banquet
 or what have you.  Gordo says that he has been able to rearrange
 his hectic personal appearance schedule so as to permit him to
 accept even more invitations from yacht clubs, ham radio clubs,
 SWL groups and other personal radio organizations.
    West says that he requires a minimum of 90 days lead time for
 such appearances, and has talks available on a wide variety of
 subjects including Tropo Ducting, an Introduction to Radio Waves
 using laser light technology to demonstrate reflection and
 refraction, a presentation on the Global Positioning System, plus
 other interesting seminar sessions far to numerous to mention
 here.  For more information on these interesting Gordon West,
 WB6NOA seminars and talks, contact Gordo at 2414 College Drive,
 Costa Mesa, CA 92626.

 *****
                           ORIENTEERING

    Amateur radio will play a major role in a national contest
 taking place in central Alabama.
    Hams are heading to the hills, literally.  It's their way of
 helping during a championship orienteering meet taking place in
 Alambama's largest State Park.
    "Basically orienteering is a sport involving following a
 course marked on a map through the forest.  And whoever completes
 the course the fastest wins."  Tom Lamb, N4OAJ.
    Tom is counting on at least a dozen hams during the weekend of
 January 22nd.  Contest checkin points are spreadout over a large
 area inside the park.  With so many stations, so far apart, Lamb
 knows how valuable amateur radio will be to the events success.
    "With courses spreading out through the forest, the longest
 course is about ten kilometers long, that is about six miles.  We
 have a got a lot of people scattered in far places.  So one of
 the ways that amateur radio ties in is helping us to organize
 much the way that a road race is organized.  But a road race is
 normally is tied around a road so that things are planned closer
 together.  We are a lot more spreadout.  So amateur radio is
 going to help us organize the different areas like the
 start/finish, results and those sorts of things."  Tom Lamb,
 N4OAJ.
    As many as 200 participants from across the nation are
 expected for the orienteering championships.  Lamb expects the
 event to run smoothly, thanks in part to the contributions of
 amateur radio operators.
    The hams will be helping not just with routine communications,
 but with any emergencies that come up, as well.

 *****

    For this week, that's all from the Amateur Radio Newsline.
 You can write to us at Post Office Box 463 in Pasadena, CA 91102.

 ****** * * Newsline Copyright 1993 all rights are reserved. * * *

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

Date: Mon, 24 Jan 1994 21:55:09 GMT
From: pa.dec.com!nntpd.lkg.dec.com!peavax.mlo.dec.com![e-mail]
Subject: Famous hams
To: [e-mail]

Get the new Amateur Radio Almanac from CQ Magazine (edited by Doug
Grant, K1DG).  It has all this and more.

- Jim AD1C

--
Jim Reisert AD1C                Internet:  [e-mail]
Digital Equipment Corp.         UUCP:      ...decwrl!mlo.dec.com!reisert
146 Main Street - MLO3-6/C9 Voice:     508-493-5747
Maynard, MA  01754  FAX:       [phone]

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

Date: Mon, 24 Jan 1994 21:54:58 -0800
From: envoy.wl.com!caen!malgudi.oar.net!news.ans.net!europa.eng.gtefsd.com!howland.reston.ans.net!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!mcws![e-mail]
Subject: LA Comms
To: [e-mail]

Excuse my butting in here...

The cellular "problem" after the quake was two fold.  First, there was the
general system overload when everyone grabbed their cell phone to either
report an earthquake or let  a loved one know they were ok.

Secondly, some cell sites were affected by the loss of power.  Driving
around I saw several sites later in the day that were conected to portable
generators.

The problem of communications was also compounded by the overload and
partial shut down of the land line telephone system.

I didn't even bother to fire up the packet system last week during the
emergency.  The frequencies around here are normally crowded and I didn't
want to make matters worse.  Just monitoring the voice traffic over some of
the major repeaters was enough!

I don't have any real backup for my packet system.  My radio is a handheld
connected to an outside antenna, so it will run off it's own battery.  My
TNC will work off a battery since it is 12-v but I usually just use it on a
converter.  The big problem in an emergency would be my computer which is
like a boat anchor on the AC line.  When I get a laptop I'll consider myself
portable (or at least transportable).

73/Roger, N6YDT  at the east end of the San Fernando Valley.

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

Date: 24 Jan 1994 16:00:06 GMT
From: news.sprintlink.net!clark.net![e-mail]
Subject: MFJ's 20m SSB Travel Radio: No RIT?!
To: [e-mail]

I'm looking at MFJ's new 20m SSB "Travel Radio" (TM) in their 1994 catalog.
Nice compact unit, running 12 watts, for only $219 (not a kit). For
a few more dollars, you can buy a plug-in CW adapter. Looks neat, if QRP
is your bag.

But, where's the RIT?? How can you work SSB/CW without an RIT? Am I missing
something here? No RIT control is visible in the photo, nor is there mention
of one. Even their QRP CW rigs have an RIT, and so does every other QRP kit
on the market.

How very strange, indeed...

K4ADL

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

Date: 23 Jan 94 21:16:18 GMT
From: nntp.ucsb.edu!library.ucla.edu!europa.eng.gtefsd.com!howland.reston.ans.net!sol.ctr.columbia.edu!deep.rsoft.bc.ca!mindlink.bc.ca![e-mail]
Subject: RAC Logo
To: [e-mail]

I am in need of the RAC (Radio Amateurs of Canada) logo in PCX, BMP, TIF, CDR
or whatever format, for desktop publishing purposes. I would appreciate
hearing from anyone who has this or knows where I can ftp it. Thanks.

Jim VE7JLS

--
**********************************************************************
Jim Sollows                       Internet: [e-mail]
Agape Data Solutions                Packet: VE7JLS@VE7KIT.#VANC.BC.CAN
**********************************************************************

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

Date: 25 Jan 1994 14:44:16 GMT
From: pacbell.com!uop!lll-winken.llnl.gov!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!europa.eng.gtefsd.com!news.umbc.edu!haven.umd.edu!cville-srv.wam.umd.edu![e-mail]
Subject: TF3CW QSL address
To: [e-mail]

I worked TF3CW on Sunday afternoon, and wonder if anyone has a recent QSL
direct address for him?

Thanks!

--
73,             _________   _________  The
       \ /  Long   Original
Scott Rosenfeld  Amateur Radio NF3I  Burtonsville, MD  |   Live    $5.00
  WAC-CW/SSB  WAS  DXCC - 123 QSLed on dipoles __________| Dipoles! Antenna!

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

Date: Mon, 24 Jan 1994 19:01:17 GMT
From: ucsnews!newshub.sdsu.edu!usc!howland.reston.ans.net!cs.utexas.edu!swrinde!emory!pirates!news-feed-1.peachnet.edu!concert!inxs.concert.net!taco![e-mail]
Subject: WWCR 5.810MHZ 8pm 12pm Eastern(CHECK IT OUT!!)
To: [e-mail]

I thought some of you might be interested to check out a very interesting
program called the Hour of the Time by William Cooper on  WWCR(world wide
christian radio). There are two programs nightly at 8pm and 12pm. Enjoy!

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

Date: 25 Jan 1994 21:54:51 GMT
From: news.cstar.andersen.com!news.acns.nwu.edu!casbah.acns.nwu.edu![e-mail]
To: [e-mail]

References <2i2u13$[e-mail]>, <2i38ta$[e-mail]>, <2i3npc$[e-mail]>ewan
Subject : Re: CW filters and DSP-9

In article <2i3npc$[e-mail]>,
Ignacy Misztal <[e-mail]> wrote:
>[e-mail] (William E Van Horne) writes:
>
>>Kein{nen Paul wrote:
>..............................
>
>>Can someone with a great deal more technical knowledge than I have
>>state just what is the minimum usable bandwidth for a 10-20 WPM CW
>>signal, and how much audible ringing is truly inescapable?
>
>>73, Van - W8UOF
>
>I assume that G is an average-size letter in Morse and the
>transmission is at 120 wpm (2 characters/s). G's sound is:

I think you should consider the worst case - not just the average
case.  The worst case is with numbers such as 5.

The average english word length (from ARRL Handbook) is 25 dots.

So, 120 wpm represents a rate of 120*25/60= 50 dots/sec.

>
>111011101000
>
>where 1 corresponds to key on, and the last 3 pauses are character delmiters.
>Assuming that a single sinusoid cycle has 2 items (00, 10, 01 or 00),
>G has 6 transitions or cycles or Hz.
>So the minimum bandwith  at 120 wpm would be
> 2 characters/s * 6 cycles/character =12 Hz.
>Multiple by 2-3 so that dots and dahs are flatter and (probably) by 2 if
>you want to copy the other sideband.
>
>The bandwith at 120 wpm is in the range of 24-72Hz, assuming no drift,
>no off-tuning and well shaped signals.

Each dot is encoded by an dot time length on and a dot time length off, i.e., a
cycle of twice the dot lenght.  This is like multiplying a 50Hz square wave
with a 750 Hz tone.  To maintain some semblance of square shape,
one would want to include the fundamental and at least the third harmonic.
This results in a minimum bandwidth of 150Hz.  If you include the 5th
harmonic then this goes up to 250Hz.

Rajiv
aa9ch
[e-mail]

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

End of Info-Hams Digest V94 #76
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