73 Amateur Radio's Technical Journal 1993-01: Iss 388

101 Pages·45.3 MB·English

‘5 Amateur - rE
JANUARY 1993
ISSUE #388
nt $2.95
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- RadioToday
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Step] Choose Your Bands!
_] Single Band: 2 Meters WB 440 MHz _| 220MHz We 1.2 GHz
Today's most popular band, the best place for new Next most popular band, less crowded with more Fairly quiet, less crowded than 440, with almost Radio's new frontier for ham pioneers. Shorte
hams to meet old hands, learn good operating high-tech, "smart" repeaters offering autopatch, half as many repeaters and the same high-tech than 2M or 220/440 in the open, but penetrates bui
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repeaters & autopatches everywhere. Great for on/ are limited-access (PL). Allows crossband repeating conversation. Great place to meet newcomers, cities. Crystal clearreception. Signaclans b e" bo!
off-the-road help. Crowded, though, especially in between singleband handhelds & dualband mobiles. youngsters. Ideal for ham family, since all classes for distance. Number of repeaters increasing
cities. Single-band mobile is easy to learn & use. 440 gives access to advanced technical info. This is have voice privileges on 220. No-Code friendly! than any other band.
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becoming the amateur's favorite mobile rig. Instant the people & services on 2M, plus the privacy & and the novelty. Particularly useful for advanced and Tech-Plus privileges. Add 1.2GHz for the b
control of either band, and you can set up your station open space of 220, plus the advantages of telephone- hams who work in the city and live in the suburbs. If you're a shortwave buff, add scanning and
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IC-449H 440MHz IC-38A 220MHz IC-1201 1.2 GHz
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IC-3230A/H 2 Meter/440 MHz IC-2410A/H 2 Meter/440MHz IC-2330A/H 2 Meter/220 M
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X-50A 144/440 4.5/7.2 200
X-200A 144/440 6.0/8.0 200
X-300A 144/440 6.5/9.0 200
X-510NA 144/440 8.3/11.7 200
X-510MA 144/440 8.3/11.7 200
X-ROOHNA 144/440 8.3/11.7 200
X-700HA 144/440 9.3/13.0 200
X-2200A 144/222 6.0/7.8 150 445MHz
X-3200A | 144/222/440 6.0/7.8/8:0 100/200
RADIATION PATTERNS FOR
X-6000A 144/440/1240 6.5/9.0/10.0 | 100/100/60 X-500HNA/X-500MA/X-510NA
BAND: 144=144 - 148MHz. 222=222 - 225MHz. 420=420 - 430MHz.
430=430 - 440MHz. 440=440 - 450MHz. 1240=1240 - 1300MHz.
* X510NJ :144 - 147 / 430 -440MHz
GH/F/UsVr e
DP-GH62 50 6.0
F-22A 144 6.7
F-23A 144 7.8
F-142A 5.5
F-718A* 440 11.5
F-1230A 1240 13.5
U-200A 440/1240 8.3/11.7
\ j
\5 X gOee ee,, / U-300A 440/1240 8.6/13.2
U-5000A 144/440/1240 4.5/8.3/11.7
U-300A 1200MHz
V-2000A 50/144/440 2.1/6.2/8.4
“F-718A:440 - 450MHz, F-718J:430 - 440MHz, F-718L:420 - 430MHz
RF PARTS
SAN MARCOS,CALIF.
[phone]
5 Amateur
THE TEAM
January 1993
Issue #388
PUBLISHER/EDITOR
Wayne Green W2NSD/1 Radio Today
ASSOCIATE PUBLISHER
David Cassidy N1GPH
MANAGING EDITOR TABLE OF CONTENTS
Bill Blown WB8ELK
PRODUCTION EDITOR
Hope Currier FEATURES . DEPARTMENTS
EDITORIAL ASSOCIATES 10 The Techno-Whizzy 1, Part Il 88 Above and Beyond
Sue Jewell 81 Ad Index
Build a direct digital synthesis (DDS) transmitter. ......... N9JZW
Joyce Sawtelle 70 Ask Kaboom
16 Programmable-Frequency Audio Generator
56 ATV
CONTRIBUTING EDITORS High accuracy with digital Control. ............:.cseseeeeeees Redman 92 Barter ’n’ Buy
Mike Bryce WB8VGE 24 The SP-1 Transceiver 52 Carr’s Corner
Joseph E. Carr K4IPV 64 Dealer Directory
David Cowhig WA1LBP ON MNO ic cnsnsssn sssuiinssctennectvsctensncsenationies WAS8TXT 17 Feedback Index
Michael Geier KB1UM 32 Twin Crystal Ladder Filters 54 Ham Help
Jim Gray W1XU/7 50 Hams with Class
Upper or lower sideband filters using inexpensive crystals.
Chuck Houghton WB6IGP 46 Homing In
Arnie Johnson N1BAC 6 Letters
Dr. Marc Leavey WA3AJR 38 Handi-Beacon 4 Never Say Die
Andy MacAllister WA5ZIB 64 New Products
Turn your tape recorder into a beacon controiler. ...... WB9YBM
Joe Moell KOOV 72 Packet & Computers
Carole Perry WB2MGP REVIEWS | 96 Propagation
Jeffrey Sloman N1EWO 68 QRP
8 QRX
ADVERTISING SALES 36 The Down East Microwave DEM 432K 96 Random Output
REPRESENTATIVES Put your HF rig on the 70cm band with this easy-to-build 76 RTTY Loop
Dan Harper 86 73 International
Sue Colbert linear transverter kit 78 Special Events
1-603-924-0058 42 The SR4 Multimode Simplex Repeater 94 Uncle Wayne’s Bookshelf
1-800-274-7373 The next generation of store-and-forward voice controllers. 91 Updates
FAX: [phone] 1992 Annual Index
WA3USG
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73 Amateur Radio Today January, 1993 3
Number 1 on your Feedback card volved with packet radio. And it isn’t as
if you don’t know that there are several
thousand hams having a ball with it.
So let's look at this fear thing and
see if we can understand it better. Peo-
ple generally fear things they don’t un-
derstand, right? So let’s look at the oth-
Ne VER SAY DIE er side of that coin. Are there any
things you understand that you fear? |
said fear. I'm not afraid of electricity, |
Wayne Green W2NSD/1 respect it. I've gotten knocked on my ki-
ester a couple of times and that’s gen-
erated a surprising amount of respect.
But it’s not fear or terror.
Once we take the trouble to find out
more about the things that we are
afraid of we no longer are afraid. I’m
afraid when I'm walking on a New York
street at night and a group of black or
Being One’s Best When | took on my responsibility as value of this approach to life and adopt Hispanic teenagers pass me. I’m afraid
While watching one of Perot’s com- a member of the New Hampshire Eco- it. So how about you? Do you settle for because | don’t know whether they are
dangerous or not. It’s the unknown. If |
mercials a few days before the election, nomic Development Commission | re- less than the best in what you do? Are
| took particular note of a comment fused to. let the politicians and their ef- you the best at work? Are you achiev- were to take the trouble to get to know
made by both Ross’s family and friends forts to block the Commission from do- ing your best in amateur radio? Are you them | would no longer be afraid.
that he urged them to not just be good ing anything of significance hold me learning all you can or are you cheating The next time fear hits, perhaps you
or better, but to be the very best they back. Ross’s idea resonated with me. yourself? When you goldbrick through can consider that if you understood
could be in life. This is a philosophy Whenever | take up a new interest | life you're only cheating yourself. what you are afraid of you wouldn't be
afraid. So, instead of fearing and prob-
worthy of consideration. It got me to tend to go at it whole hog. When | got Let’s see, what is there to do in am-
thinking . . . have | done my best to be interested in horseback riding | took ateur radio that | haven’t done yet? ably running away or avoiding, try to
the best? How about you? lessons . . . and more lessons. | found What new challenge is there for me? find out more about what has fright-
Here you are, a licensed amateur. better and better experts and soon | What challenge is there for you? What ened you . . . knowing that this will
eliminate your fears.
That means you've passed the license was teaching riding instructors myself. haven't you done yet? Why not? What
Religions rule billions of lives
exam. Did you do it the easy way, by When | got into sports car rallying | first are your excuses?
through fear. Fear of punishment for
memorizing the Q&As? Or did you learned to navigate and then to drive. |
buckle down and learn the theory which developed a new navigation system Chess sins. Fear of the devil, of hellfire, and
you were being tested on? And since which filled shelves with trophies. | How’s your chess game? Chess is a so on. | can’t fault them for that be-
cause it pays off. It pays off in billions of
you’ve gotten your ticket have you needed special watches which would wonderful game to teach kids because
dollars. We have some extremely
been trying to learn more? | wish | keep time accurately all day so | found it’s totally skill, with no chance element
wealthy religions, all built on fear. But
didn’t know the answer to that. a factory in Germany to make them for whatever. When you get involved with
you know, we haven't a shred of proof
As an amateur you have the oppor- me and | imported them. | discovered a chess you soon discover that the more
that any of these fears are real. Millions
tunity to get involved with a wide variety special pepper-grinder-like calculator you learn about the game, the better
of people believing things doesn’t make
of activities. How much advantage used in Europe for currency conver- you play. A good player will always
them true, otherwise the sun would still
have you taken of this incredible oppor- sions, but which was ideal for rallying. | trounce a lesser player. Aha! So how
be spinning around the earth and
tunity? Are you marking time through went to the Curta factory in Liechten- does one get to be a good player? You
Columbus would have fallen off the
what's left of your life talking about stein and made a deal to import them do that the same way you get good at
nothing at great length on 2m or one of for rallyists. |d eveloped and printed my anything else . . . you read a lot about it edge of the world.
the low bands? own rally tables, which were incredibly and you take some lessons from an ex- Now, are ycu ready to give packet a
Being the best in amateur radio simple compared to those made by oth- pert. You'll have to memorize hundreds try? It's wonderfu! fun and you're miss-
means different things to different folks. ers. My customers were soon winning of openings, and thousands of end- ing a whole big piece of our hobby. Yes,
of course you're going to have to learn
To me it means learning as much as all the rallies. game closings. You learn to be aggres-
a lot. And you’re going to make all
you can. It means exploring every When | got interested in photogra- sive or lose. The fact is that the game
kinds of dumb mistakes. Hey, there’s
mode and every band. It means work- phy | read books, took lessons and of chess is a wonderful teacher for life.
ing DX, going on DXpeditions, working spent endless hours in the school dark- It'll teach you the fundamentals of busi- always a first, right?
Step two. . . | expect a letter from
packet, RTTY, SSTV, moonbounce, room building my skills. | armed myself ness. You'll learn to do your homework,
OSCAR, transmitter hunts, ham club with everything from 35mm to 5x7 cam- be aggressive, and look for creative you thanking me for pushing you into
work, helping put on hamfests, helping eras. This helped me greatly when | be- new approaches to old situations. You'll this.
with emergencies, handling traffic, came a TV cameraman at WPIX in learn the value of persistence. Reason Prevails
helping newcomers get licensed, build- New York and knew how to compose Go is another game of skill and its
ing equipment, winning contests, run- pictures . . . and later when | was a TV popularity in Asia has a good deal to do The League has backed down on
ning a repeater, pioneering new modes director in Dallas and in Cleveland, | with the way the Asian countries have their opposition to automatic relaying
or technologies, making friends for helped my cameramen get great pic- been running circles around us in busi- on the low bands. I'll let the packeteers
America in other countries, and even tures. In my early publishing days | took ness. Chess and Go teach qualities give you the gory details on what hap-
serving your country in time of war. most of my own pictures. which are valuable to a country. They pened.
Then there’s being your best at your | didn’t take up skiing until | was 44, help teach the work ethic. You don’t win | can understand concerns about the
work. What a shame it is when parents but then | went at it furiously. | took at chess unless you work at it, but if blind relaying of messages, where
don’t teach their children the impor- lessons and more lessons. In just a few you do you’ll surely win. That’s great there would be a strong possibility of
tance of being their very best. To me weeks | was skiing better than | ever training for life. jamming contacts already in progress.
that means knowing more about my thought I'd be able to in my life. So | This is much like KIMAN or W1AW
work than my competitors. It means took even more lessons. Now, at 70, Fear coming on their self-assigned frequen-
endlessly doing my homework. . . I'm brittler and thus a bit more cautious One thing that’s been bugging me is cies and broadcasting blind.
which isn’t actually work because it’s in the trails | ski since breaking some- why so few hams have actually tried Most of us pick what sounds like an
fun. It means attending conferences, thing would be extremely inconvenient, packet radio. | wonder if it has some- unused frequency and then ask if any-
taking classes, reading books, sub- but | still tear down the mountains, hav- thing to do with fear? A fear of embar- one is using it before we launch into a
scribing to magazines. | just bought a ing more fun than should be legal. rassment of making mistakes when long CQ. Perhaps the packet software
new stack of books and am working my Somehow my parents got across to you're into something compietely new? developers can get our packet (and
way through them. Some are tedious to me the concept of trying to be the best | A fear of displaying your own ignorance RTTY) systems to emulate this ap-
read because they're so poorly written, could at whatever | got interested in. of both radio and computers? A fear of proach. If a relay station could send a
but most are wonderful and give me I've been preaching this idea in my edi- the unknown? short coded signal which wouid ask if
lots of ideas. torials, hoping others would see the It isn’t as if it costs much to get in- Continued on page 66
4 73 Amateur Radio Today «J anuary, 1993
—_—_——_ %
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The TM-241A provides 50W, TM-331A is 25W,
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The TM-241A receives from 118 to 173.995MHz;
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20 multifunction memory channels store frequency,
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LETTERS Number 2 on your Feedback card
and doing something about getting cuits for years and never figured it
young people interested and up- out. | always looked for feedback
grading their own skills in a few of from the emitter or collector to the
From the Hamshack the multiple areas of amateur radio. base; | did not realize it was a com-
A suggestion | would make is to mon base configuration.
adopt a library, either a school or The rest of the article was equally
public library. Make it a normal prac- insightful. Thank you.
tice to donate a book on electronics
Joel Weder VE6VOX, Calgary, imagine, we usually get quite a pile- or amateur radio on each of your Jim Kocsis WA9PYH, South
Alberta, Canada | was reading my up when we get on the rig. birthdays or on July 4th as a birth- Bend IN Wayne, | thought I'd better
July/August copy of The Planetary | have been here for eight years, day gift to the country. Skip that write to you and let you know that
Report (published by The Planetary arriving as a private and commercial meal out in the restaurant and do- I've been taking some (not all!) of
Society, which promotes space ex- pilot ground instructor and have nate a book instead. Send the XYL a your advice. First of all, I'm a sub-
ploration) and came across a rather moved to being the senior instructor card and tell her that her flowers scriber since 1965 so I’m a long-time
interesting article, “Doing More With for 747 avionics systems instruction were converted into a book. Encour- reader of 73.
Less: The New Way of Exploring the for the flight crews. My former occu- age others to do the same. Ham radio is alive and well in our
Solar System,” by Rex Ridenoure. pation was as a physics teacher in a town and I’m fairly active, but |
The article discussed the trend to- high school in Minnesota. Wayne, | Fred E. Piering WDSHNU, Mait- thought | would share some info with
wards smaller and more cost-effec- do agree with some of your conclu- land FL My God! Wayne, what’s you and 73s readers on non-ham-
tive space probes. What's interesting sions in your editorials concerning this world coming to? Since tne birds radio subjects. | read a lot and have
about it for you and me is his de- the education of youth. However, it have left the nest, my wife has con- read some very interesting books in
scription of the rate of technological is easy to use a big brush and to templated starting a small business, the past few years. There are much
change involved: “.. . the SDI and think every classroom is the same. such as a grocery shopping and de- more interesting things and thoughts
commercial space segments are There is a lot of quality out there. livery service for the elderly or infirm going on in the world than what the
three to five years ahead of the Granted, there may be less than in (she likes to spend other people’s AP, UPI, etc. think we should know.
space exploration field in developing previous decades, and the objec- money—read: mine). So, when | Why am | mentioning this in a
and applying new satellite technolo- tives of education may not be appro- read your editorial in the November ham radio magazine? Only to prod
gy; these groups were preceded by priate to today’s required work force. issue | showed her the section you people to talk about more interesting
the academic and amateur radio So, why am | not still in the class- wrote corserning “Making a Buck.” things than RST, the rig, weather,
communities.” room? | had given a lot of effort to When | found her reading page 76 | QSLs, etc. My gosh, we have a
These days everyone (Wayne es- the students, received several inquired, “What are your doing?” “meeting room” that spans the coun-
pecially) seems to be wondering awards for teaching excellence, and She responded that she found you try (actually the world!) that we can
where amateur radio is going—what received little support from the local very interesting and profound, very use 24 hours a day for free and we
will be our reason for being. Well, | administration. | did what | wanted to informative! are not doing it! I’ve tried skipping
think this article just shone a little do, did well, but received nothing ex- She asked how long you had the rubber-stamp QSO format and
light on the path. There are still tra beyond what an “average” teach- been writing editorials and | told her have had some excellent discus-
hams experimenting at the forefront er would receive. Finally, teaching 30+ years that | could remember (I sions with fellow hams. | heavily rec-
of technology, whether it be with OS- college placement physics, standard Still have some 73s from the begin- ommend this to the readers of 73.
CAR, packet or repeater linking via physics, and aerospace; and acting ning). Well, now | am under strict or- As far as TV is concerned, | per-
satellite. The club that | recently as radio club advisor, chess club ad- ders that from now on when | re- sonally only watch a few shows reg-
joined here in Calgary (CARA) is visor, faculty social committee chair- ceive my 73 in the mail, | am to turn ularly. | want to be informed or enter-
one of the most progressive I’ve man, athletic field manager and sci- it over to her so she can read your tained (made to laugh, not de-
seen because (it seems to me) they ence department chairman wiped editorials. Maybe she should pay for pressed!). What can you do in your
keep politics to a minimum, aren't me out. The number of students in- the next subscription? spare time if you don’t want to yak
afraid to jump into a new project and creased and the money available for on the air? Anything! But don’t waste
concentrate on getting things done. supplies went down. How do you L. E. Dickason N8MKM, Jack- your time doing the same thing over
Those are, as any good business- teach physics when the annual mon- son OH Wayne, your June editorial and over and over again. My gosh,
man knows, among the central keys ey per student for all supplies is less requires some comment. | agree we’re not robots (or are some of
to success. than a meal for two at McDonald’s? that 20 wpm is a little silly in our digi- you?). And if you can’t read when
| recently gave up a well-paying Until the business world and the tal world. | am a Tech with 5 wpm, there is time (my eyes get tired at
job as a military photographer to go public want to have responsive, but | really can’t see the value in suf- night but | still feel like | need some
to college. Most of my friends think quality schools and are willing to fering through the code to upgrade. input) there are tapes at your local li-
I'm crazy to do such a thing during a support appropriate school goals Why not a series of tests which em- brary that are instructive, entertain-
recession, but when | graduate as a emotionally and financially, there will phasize theory, rules and COUR- ing or just pleasing to the mind. Did
telecom technologist it'll “open a be little change. | did get tired of mu- TESY? you ever try listening to one of those
whole new world” to me. | guess my sic departments getting personal | started reading 73 as an SWL subliminal tapes (weight reduction,
point is that we, as amateurs (and computers to maintain inventories of because you had good articles on controlling anger, dealing with angry
North American society as a whole), instruments, uniforms and candy antennas and other topics and be- people—the list is endless)? Did you
need to be willing to take chances sales while the science department cause you didn’t talk about SWLs as ever try listening to a tape on self-
on change and innovation. We can- uses instructor-purchased comput- if they were vermin. It takes more hypnosis? Or music from another
not allow ourselves to continue be- ers. It was that or have none. But than glossy paper to make a maga- culture? There are tapes that are
ing afraid of the future. then, music and athletic depart- zine. condensed versions of some very
ments have their parent support Speaking of high-tech, | would good books.
David K. Hansen KBOEVM, groups. Maybe there should have like to build a digital signal processor Now, after you've read something
Jeddah, Saudi Arabia Greetings been a science concert some and a panadaptor or spectrum ana- off the beaten path, try telling some-
from Jeddah, Saudi Arabia. Amateur evening. lyzer. Where are the projects? | en- one you contact on the air about it
radio is pretty limited here, although There will continue to be young joy “Above and Beyond” because it and discuss it—you will be pleasant-
the Oasis Amateur Radio Club has dreamer teachers, there will be pushes my understanding to the lim- ly surprised by their reactioni Ditto
been in operation since last Febru- those who sacrifice their own family it. Isn’t that what it’s all about? for people at work. Mostly what I’ve
ary. The call is 7Z2AB and our QSL time to do a good job, but some- heard is: “Gee, | always wanted to
manager is AA@BC. There are where around the 30- or 40-some- Guy Metrocavich, via Instinet | know about that . . . but | never had
about 15 hams on the roster and things they look in the mirror and thought Sheets and Graf's article ti- the time.”
many activities going on. The equip- make some inner comment about tled “ATV Transmitter, Part |” (Au- How about it Wayne, am | right?
ment includes an ICOM 725; a Ken- “what is this getting me?” gust 1992) was great. | enjoyed the The most exciting things are the un-
wood 440S; beams for 12 and 17 Let me get off the soap box and thorough yet concise circuit descrip- known and the new, not the same
meters, and for 10, 15. 20 and 40 to the main reason for writing. Being tion. For example, the description of old same old.
meters. Our hours are somewhat here | can appreciate the restrictions the Ci oscillator gave me all | need- Please keep “on our cases”
limited, but any availability of opera- on radio operations. | only hope that ed to understand how it worked. Wayne, we need the constant moti-
tion is appreciated. As you can amateurs are picking up the baton | have seen this oscillator in cir- vation!
6 73 Amateur Radio Today« January, 1993
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e Very low noise: 0.7dB vhf, 0.8dB uhf might pay for a bare-bones repeater or controller alone!
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e GaAs FET Preamp similar to LNG, ex- be used with almost any repeater COR
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timers, solid-state relay, courtesy beep, option avail.) 143-174MHz; 15W 213- timer, and courtesy beep type can be
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mute speaker until someone calls you
by sending 4-digit tt signal but may also FM EXCITERS: 2W continuous
be used to turn on autopatch or other duty. TCXO & xtal oven options.
device kit $49, w&t $89 FCC type accepted for com'l
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ueL hofKw i tb anlnoeidsssse occnao snaev e1r$0t4Me9r ,s r ekcitetoi vrere.cw e/icvasee vh&f BaNnCd rpehpoenaet er lianuet okpirta et$mc8ho9.t, e wRirecevoden trr&soe lt esptaaetrdec h $1as4tnd9d. «e TTMAAzS415 :1 :.. .5k0i4t- 25$041-,04 97,15 4 3w-M&1Ht7 z4 $,1 8291. 3-233
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c2o22n,v er4t3 2,1 04M3 5,s sabn, dactw,v . fm, et1cW. toou t2pMu,t. 220, Tdirraencstmliy ttweirtsh maonsdt RTeNcCe'isv.e rs.F ast,I ntdeirofdaec-e wR/7o6 hEelCicOalN OrMesY or FaMfc . RC..V.RKi ts fo$r1 2298,- 30w,& t 50$-25149,. 73-76, 143-174, 213-233 MHz,
Kit only $89. PA's up to 45W available. switched PA's output 15 or 50W. R137 WEATHER SATELLITE RCVR for 137 MHz. Kit $129, w&t $219.
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Number 3 on your Feedback card
The Emergency Broadcast Please contact Carole at P.O. Box 131646, capabilities described in subparagraph
Staten Island NY 10313-0006, or call her (A), (B), or (C) of paragraph (1), as such
System Today
at [phone]. capabilities are defined in such regula-
tions, shall be manufactured in the United
Hearing “this is only a test” broad-
States or imported for use in the United
cast by your local radio station may be-
States.
come a thing of the past. The FCC has Congress Enacts New [By Roy J. Cloutier, adapted from public
announced a “comprehensive attic-to-
postings on Prodigy. TNX Westlink Report
basement” plan to overhaul the Emergen- Restrictive Scanner Law
#637, November 12, 1992.]
cy Broadcast System (EBS). EBS has not
been updated since 1976. Its name may The law prohibiting the manufacture
be changed to the Emergency Warning of scanners with (or easily modifiable to Space Symposium a
System (EWS). include) the cellular bands passed the
Proposed is a new form of silent testing Senate (reportedly without debate) on Oc- Great Success!
and a cutback (from weekly to monthly) in tober 8th. The “cellular ban” was an
the amount of on-air testing. Actually, new amendment to the FCC funding bill and it The Tenth Annual AMSAT-NA Space
equipment will be able to test itself. is entirely possible and even probable that Symposium and meeting was held at the
The FCC is suggesting a new “subaudi- most senators had no idea the cellular beautiful Intelsat Headquarters building in
ble” warning system that will preclude us- amendment was there or what it meant. Washington, DC, on October 9-11. The
ing the familiar 20-second tone that mixes The following comments, which have ap- 300 in attendance heard presentations on
853 Hz and 960 Hz together in order to ac- peared in several places, are speculation such diverse subjects as antenna testing
tivate emergency listening devices. until an official interpretation is published: for the Phase-3D spacecraft, use of the
Cable operators, who currently do not (1) Receivers with external converters, PACSATs, SAREX hardware configura-
have to perform EBS tests, will be required lab-type receivers and tunable receivers tions and the AMSAT awards program.
to join TV and radio broadcasters. are not affected by this law. Scanners are Once again this year, the ARRL co-spon-
In 1991, EBS was used more than 1,500 affected. Once the law goes into effect sored an educational workshop at the
times. The Emergency Broadcast System (180 days from October 8, 1992), no scan- Symposium. A complete satellite station
was activated nearly a day before Hurri- ner can be manufactured that will cover that was installed for the weekend was
cane Andrew hit the south Florida coast. the cellular bands, nor can it be made to used to make several AO-10 and AO-13
EBS was established in 1951 as the be easily modified. contacts, including a scheduled QSO with
CONELRAD (Control of Electromagnetic (2) It looks as though as long as the a special event station at the AMSAT-Den-
Radiation) system during the Truman ad- scanner is made with a continuous large mark meeting being held in Copenhagen.
ministration to provide the president with frequency range, you can include the cellu- Dr. Ron Parise WA4SIR was the ban-
the means of addressing the American lar frequencies. quet speaker. He entertained the audience
people in the event of a nuclear attack. (3) This law does not affect used scan- with a talk, slides, and a movie detailing
The service has yet to be used during a ners or scanners that were manufactured the Astro-1 space shuttle mission on which
national emergency. prior to the effective date of the law. he was a payload specialist and SAREX
The Truman administration envisioned Here is the exact text of the new law: operator. The evening ended with presen-
that the President or a government agency Sec.408. INTERCEPTION OF CELLU- tations of awards and a drawing for the nu-
would activate the tone to control a master LAR TELECOMMUNICATIONS. merous door prizes that were generously
radio or television station, one specifically (a)AMENDMENT—Section 302 of the donated by many different companies.
constructed to withstand an atomic explo- Communications Act of 1934 (47 U.S.C.) is The printed proceedings (32 papers, al-
sion. The station’s command tone would amended by adding at the end the follow- most 300 pages total) are available from
be heard by other stations, linked in a ing new subsection: AMSAT-NA Headquarters. Look for a de-
pyramid: Those stations would be heard by (d)(1) Within 180 days after the date of tailed report on the meeting and sympo-
other stations, and so on. enactment of this subsection, The Com- sium in the next issue of the AMSAT Jour-
Currently, EBS is only used at the local mission shall prescribe and make effective nal. TNX AMSAT-NA; Westlink Report
level to notify the public of dangerous con- regulations denying equipment authoriza- #637, November 12, 1992.
ditions: toxic leaks, tornadoes, hurricanes, tion (under Part 15 of Title 47, Code of
chemical fires, earthquakes, floods and Federal Regulations, or any other part of
such. The EBS was even used during the that title) for any scanning receiver that is
LA riots to call off-duty police officers back capable of— ™NX...
to work. TNX The F.O. Flyer, October (A)receiving transmissions in the fre- . .. to all our contributors! You can
1992. quencies allocated to the domestic cellular reach us by phone at [phone], or
radio telecommunications service, by mail at 73 Magazine, Route 202 North,
(B)readily being altered by the user to Peterborough NH 03458. Or get in touch
Youth Forum receive transmissions in such frequencies, with us on CompuServe ppn 70310,775;
or MCI Mail “WGEPUB”; or the 73 BBS at
Interviewees Needed (C)being equipped with decoders that [phone] (300-2400 bps), 8 data
convert digital cellular transmissions to bits, no parity, one stop bit. News items
Carole Perry WB2MGP is seeking ar- analog voice audio. that don’t make it into 73 are often put in
ticulate, active amateur radio young- (2)Beginning 1 year after the effective our other monthly publication, Radio Fun.
sters up to age 18 to be interviewed for date of the regulations adopted pursuant You can also send news items by FAX at
various youth forums across the country. to paragraph (1), no receiver having the [phone].
8 73 Amateur Radio Today January, 1993