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dwarfed everything by its magnitu de ; t he spindly alde r t rees loomed like ma tc hsticks t hat swayed slight ly before th e churn ing te rr ible gr ey ne ss. A gainst the dee p gloom, the pale sickening grey of the caulif lower column o f t he ma in erup t io n w rithed upward s. carrying its load of ash a nd pumi ce and supe rheated poisonous gases, For a sho rt while a b lue car hurtled down beh ind us, as terrified as w e were, and t hen it turned off. The la st thing I rem ember before we reached th e relative safet y of Lake Merril l (be low the ex po sed ridg e) wa s a swe ll ing deep grey cl oud dram atically rim med in su nlit silver and edging the sky's sof t blueness. At last we da red to stop. We breathed sil ent pray ers of th ank s. W e sw itc hed th e 210 to high power a nd picked up Ma rv W7RPT in Va nco uver, w ho re layed to O ly mpia tha t we we re OK and returning home. We co uld now see the cloud's edge, stea m w hite ned and ri sing fo unta inlike above us to a scallop ed saucer-shape d di sk, sw irling with gr aceful effects. At the junction of the forest road with the highway, w e passed a roadblock and then bo rdered Yale Lake w here people we re d riv ing toward t he mounta in to 'sightsee. Soo n w e w ere in green count ry and o n p a ve d ro ad s a ga in. Nev er have green and growing thi ngs looked so beautifu l ! Tho ug h c hu rchbe ll s were rin ging in a country chapel, people were outsid e watchin g th e toweri ng in ferno of a volcano t ha t had unleashed an explosion as powerful as the hydrogen bom b' Into th e hazy blue sky the decapitat ed rnounta i n ? was pouring multiple co lum ns of ash and st eam tw el ve mi les h ig h a nd e v en tu a l l y aro und th e w o rld. (No eruptio ns of Mt. SI. Helen s had , been this b ig for nearl y 3000 yea rs.) W e turned aw ay from t he black ho rror of a sunny Sunday in M ay and d ro ve hom e , expe ri e nc i n g a st ro ng sense o f unreality. We kne w that people like Jerry M artin W6TQF, Reid Blackburn KA7 AMF, and Dave John ston ' had di ed in the terrible b last of our o nce se re ne Mou nt St. Hel ens. W e had been allow ed to liv e.' W e fe lt hum ble.• Aut ho r's Notes 1. The blast, fanning out twelve to fi ftee n miles in a nort hwest, north, and northeast direction, devast ated 156 square miles, felled tree s like matc hstic ks, and ra ined ash to a dep th of four feet in the area where Jerry Martin , Reid Blackburn, and Dave John ston were working. It destroyed 2 bill ion boa rd feet of timber and left a " moonscape" of unre cogn izab le land forms around the Spirit Lake area. 2. The exp losi on lowered the mo unta in by 1300 feel. It opened a new huge crater on the north side measuring abou t 2% mi les long by 1Y2 miles wide . 3. Reid Blackburn KA7AMF, a newspaper pho tographer, was doing voluntary wo rk for USGS and Nati on al Geographic. He was in the same general area as Dave Johnston, wo rki ng for USGS, and Je rry. Though Jerry Mar ti n is presumed dead , he is listed amo ng the mi ssing. He sp ent about a mon th on vol ca no watch at a different location befo re com ing to the viewi ng spo t near Coldwater Peak. 4. Though the d evastation st opped at the South Fork of the Toutl e Canyon uncomfortably close (within a mil e) to our location, it d id not reach our camp, except for some ligh t ash. One gas can we'd left in our hurry was picked up later that day and said to be very warm . lle\\ ·-uscful-dear-
Signalcl'afters Pl'esents The ~I o s t Advanced Automatic Computing Power lleter's In Amatem' Radio! MODE LS 31 and 32' O ur po rtab le Model s 31 and 32 feat ure the same state-of-the-art technology that is incorporated in the ir Big Brot her, th e Mode l 30. Never again will you have to bother wit h SWR "calibrate" con tro ls and switches! Signa lcrafters' cust om integrated ci rcuit makes power and SWR mea surement a "handsott" o peratio n by automatically co mputing SWR The result is unparalleled accu racy and ease of operati on. FEATUR ES: • CUSTOM Ie- Computes SWR from th e level sen sed on th e tran smi ssion line ind ependent 01 the po wer level. Th is analog co mputer ope rates over a range of only one watt to the full scale of the meter with unequaled accuracy. • RUGGED TAUT-B A :-';O :\IETER..l
Page 1 and 2: Ii Gift to , enty Years of 73 o 174
Page 3 and 4: Rack Attack from DenTron Components
Page 5 and 6: Escape from Mt. St. Hel e ns! .....
Page 7 and 8: Small wonder. TRIO-KENWOOD COMMUNIC
Page 11 and 12: Afresh idea! Our new cro p of to ne
Page 13 and 14: All new, all nine hf bands and only
Page 15 and 16: 1. SENSITIVITY: Superb amp lif ier
Page 17 and 18: Touch-Tone Decoders . SJ.' ·_ M·
Page 19 and 20: WHEN OUR CUSTOMERSTALK•.• WE LI
Page 21 and 22: STOP RF SPILLOVEI You may be losing
Page 23 and 24: ( LEAKY LINES Dave Mann K2AGZ 3 Dan
Page 25 and 26: 73's ICOM IC·720 DEAR OM: There ar
Page 27 and 28: MEMORY KEYER BREAK THROUGHI New l
Page 29 and 30: INTIMIDATED BY MORSECODE? THE NEWAE
Page 31 and 32: Solid-State H.F. Kilowatt Amplifier
Page 34 and 35: Escape from Mt. St. Helens! M arian
Page 38 and 39: Edward t. M ulvin WBQI FF 34()()54t
Page 40 and 41: Phot o E. The AB C " That's Incredi
Page 42 and 43: W erner M . Ma urer W1QMS Kefl y Dr
Page 44 and 45: MEMORY KEYER BREAKTHROUGHI The rema
Page 46 and 47: -WILSON SYSTEMS, INC.---.... the SY
Page 48 and 49: WILSON SYSTEMS TOWERS !i ~ ' ''0.0
Page 50 and 51: Joseph D. Novak K40VK 2420 Luckett
Page 52 and 53: Antenna azimuth for ATS·3 from Was
Page 54 and 55: ---SCR1000VHF-SCR4000UHF---- 7i?
Page 56 and 57: Joe wesrennaver W4FE:. C 155 Wood f
Page 58 and 59: f MEMORY KEYER BREAKTHROUGHl The re
Page 60 and 61: The Arcane Art of ATV the transvert
Page 62 and 63: Th e 2N2219 t ra nsistor specif ied
Page 64 and 65: Photo E. l eff WB8 RIY, about 5 mil
Page 66 and 67: Pho to G. Rack-mount installat io n
Page 68 and 69: Robert B. Grove WA 4 PYQ Grove Ente
Page 70 and 71: proveme nt over the origina l To uc
Page 72 and 73: channe l l ; ente r 139.1 MHz into
Page 74 and 75: detector. Be sure receiver is sw it
Page 76 and 77: Joseph H. Cowen WA 5TUM P.O. Box 76
Page 78 and 79: an advance piece and aft erthe-fac
Page 80 and 81: School and ret ired surgeon Dr. N i
Page 82 and 83: 73 Magazine Staff Field Strength fo
Page 84 and 85: Photo B. Front of th e con verted Y
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TE1: ANTENNA SYSTEMS l-BoO-654 -}2}
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Robe rt M . Brown W9HBF 561 1 M idd
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c o u ra g i n g a n d wo r th repo
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elay (I used a 3PDT type) . When th
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'" '" 117 VAC NEON DIAL LITE .l 117
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Fig. 9. This view sho ws how the ra
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~ ''' ' '' '' '' -- sli de the cap
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"' 0." -t ee' I CONNECTOR~ TO IlR M
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1'::1" ~~4 ""ATTENTION MOBILE HAMS
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Patrick M cGuire W BSHGR 102 Dunca
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SECURE THIS END TO BOT TO M PL ATE
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Then buy a small can of red spray e
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Description a) Print frame (same as
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MEMORY KEYER BREAKTHROUGHI The rema
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INTIMIDATED BY MORSE CODE? THE NEW
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RTTY Demodulators ~~;~~ e $449. 00
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BUU Directlromthe Tri·EK@ Factoru
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• CALL 1 N8AD 2 KB8/>J'1 l WAlDCS
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• •• Computerize your log boo
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is sim p lif ied and refined t o al
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upts but often gets in the last wor
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signals. It decides tra nsm itter o
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.... Reader SelVice- see page 274 7
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IIEW IIIFFEIEIiT FROM BARKER & WILL
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Have you ever wondered why the best
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P ~ESCA l£ I NPUT C2 C1 I~ ;;-----
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A 40-pin socket must be used for th
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un til it changed tone and wo und d
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MF.J 941C Versa Tuner II , i i 11f!
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Two fuses are incl uded fo r safe t
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pu shed for th e switch to SSB and
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October 1960 .. .....de W2NSD PI ,a
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A M ATEUR RADIO 73 6' YIO carRad¥
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73 1964 January INCENTIVE LICENSING
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John W . CampbeJl W2ZCU How To Be A
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would simply melt the m selves in
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73 1966 Oc tober de W2NSD/l de W 2N
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162 73 Magazine . Oct ober, 1980 19
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1969 October ...de W2NSD/l rr ay ne
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1971 Decem ber Mean ingf ul Conu cu
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Jean Shepherd K20 RS Some Guys Make
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1973 July .......····n~ 73's HA
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1975 August 1: ~ '3~fr EOi TORJI'\.
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~ ~ >. :; ....., co t" O) , f "i'
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1978 August : :~~. Ir EOITOM'U8USHE
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1979 March ( UJoTOM'V 8USHEII W. ..
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manage o n 4o-mete r phone for the
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Fig. 3. Basic patte rn developed fr
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of-contac t are three: New England,
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32 ' I " 3 2 '" 3 2 ' . " 3 2 ' I "
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Gilding the Lily - FT-101 mod for c
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Mike Mods for the KDK-2016A - impro
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Clock Blocks a compendium of TTL an
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ea BOOK CIIlOS I"lV ERT ER "0001 "
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73 Magazine Staff Build a Better Ba
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TUfTS Electronic Department Store,.
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TUfTS Electronic Department Stor~"T
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Page 204 and 205:
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TUfTS Electronic Department Stor~.T
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t.a IO,. H r "001 ,j- ± " ~ cs r u
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and 5. The purpose of the divide-by
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3500. To do this division by 3500,
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l i mi t er o utput on p i n twe lv
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Radio Amateurs! Tempo Handh
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79. Late in 1975, as the JARL looke
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QRP ARCI ANNUAL OCTOB ER QSO PARTY
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("----~) FUNl from page 28 5) The "
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you need a friend w ho works fo r M
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held, and the Georgia State CW Asso
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FREE! RADIO AMATEURS WORLD ATLAS wi
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DireCiional RF Wallmeler Dielectric
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control of an amateur radio station
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SatelliteT~ FORTHE HOME Sick of Net
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schematics, formulas, construction
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Th e Comm issio n s tated , " Lo ok
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MFJ RECEIVER ANTENNA TUNER/PREAMPLI
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c lasses are proving that it is pos
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74l SIllITTL IUSooN l4lS0 2N " l50'
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NO BULL SHi", • Over the past thi
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7294 N .W. 54 STREET MIAMi. FLORIDA
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• linear Converters for SS B, CW,
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L.. ....J ...... 28 22 North 32nd S
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ATTENTION IC·2AOWNERS: IC-2ATONE D
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smsat !!!ill. CP'O -.4,,...a_ " N '
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BLAK-RAY Ultraviolet Intensity Mete
Page 263 and 264:
PROUDLY PRESENTS the GLOBAL SPECIAL
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TOLL FREE # (800) 528·0180 (for or
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MICROWAVE COMPONENTS COMPUTER I.C.
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• NOV ICE STUDY GUIDE-SG7357-Here
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= = === = TEST E QUIPMENT =====:::;
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EALER PROPAGATION San Jose CA Bay a
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