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| BULLETIN ISSUED BY THE NORTHERN ZCNES CF THE
WIRELESS INSTITUTE OF AUSTRALIA TASMANTIA DIVISICN
SEPTEMBER
P.C., BOX 1010,
LAUN CESTCN,
TAS. 7250.
VOL. 1 MNC, 5
AEGISTERED AT G,P.C, HOBAGT
for transrissicn by pest as
a Periodical, CATEGORY B. PRICE 5¢.
e e - et . e ) .i e ee o S 1 ee i e 3 eo,i
Recent corresncndence in A.R. indicates that there is centinuing pressure fer
the iritrcduction of a Nevice Licences It wuld alsc seen that the Fed, Exccutive ar
the P.M,G,'s Departrent are nct in favour of such = nrcposal, =lthcugh, Fed, Exec,
scers tc indicate, that shculd there be encugh in fawveur, cfforts will be made te
have such a-class recognised, I fcel that in view of the inerican situation, a
Novice Licence is not in the best intercsts cf the amateur in this ccuntry, sirmly
beseitse 1t w:ll bc necessary to have sprectrun made aveailable, or alternately,
existing space allcttcd, Just wherc woeuld yeu placc ther, The general cry is, thal
we do not have encugh space ncw, It is ny view, that Ncvices arc well taken care o
in the forn cf schecl and University Redic Clubs,- Here we have 2 situaticn where
1~———
any student, without qualificaticn, except interest, has 211 the benefits of the Z
licencee and more, It shcul‘d. be cur ain tc raise the standards ¢f cur hcbby, and
I weuid say te these who could nc.t care less, think abcut it, thc 4,0.C.P, is nct
all that hard tc get, Hrwcan we justify curselves by introducing a class cf lcwer
étmdard. Incrurage these whe arce intercsted, and-help them in all ncssible ways e
jcin the ranks, Let's nct lewer cur sights in any way, Remember daylight saving
was nevarly axed by the lcud vc*‘ice; cf a small minerity and the same cculd apnly tc
cur frequcncies,
A MNZ, Bill, 7AK,
NN H I AN KK
COMING EVENTS
SEPT. 7th North West Meeting, Lekin's Hall, Ulverstene,
SEPT, 10th Nerthem Zonc Mccting, Adult Educaticn Beard Lcen 10, at
8 High Street, Launccsten,
YRCS CLASSES cn SEPT, 18th and CCT. 2[1(1 at Kings Meadcws High Schcel,
Blcck B, Reoen 38,
VK~ ZL, CONTEST
NQV. 27th and 28th HAMFEST - DETAILS LATER
The Geperal Meeting of the Nerthern Zene was held cn Fridey, fugust 13th,
This was cur first reeting in the new rcoms at 8 High Strect, which is quite an
imprevenent cver York Street, The rcen is apnrcxinately twice the size has
carpcts cn the flecr and best of all, the scats are uphclstered,
Visitors to the Zene were TED 7LEJ, PAUL VK1ZPB end BRIZN 7RR, althcugh Brien
can hardly be rcgarded as a visiter anyrere, Adder tc this a mermbership attendan
cf 33,
Peter 7PF repcrted that the repeater annlicaticn has been re submitted and
that nc interference te cther services was apparent,
Serie discissicn teck place cn the sugzesticn of putting reney aside fer a
club rcen fund, However the rceting felt that we shculdn't tie cur rency up in
a fund as it weuld be difficult te withdraw if it shculd be required fer ancther
prcjcet, The rceting was then treated tc a very infermative talk on an elcctreni
calculater by TED 7EJ after which the mceting clesed at 10,00 hrs,
The noxt mecting will be an Equiprent display night sc if ycu have built
scricthing new in the last 12 renths, bring it alcng, After all this we will be
shcwn a filn called "TRAVELLERS" frcer Phillins,
NRHK
FeR A I FRF
BEV/! 7CX cbvicusly hasn't hcard cf Lew Pass Filters te prcvent harrenics,
Hew abcut trying cne fer the fifth Beven.
RN FRFHHNHK
CCNGRATULATICNS tc BEVAY 7CX ancd ANETTE cn the birth of ancther sen.
HK
HH R KK
IF we cver need pecple fer a werking bee there is o group of neeple that
arc good at wrecking, I am referring te the group that went te 7EX te rermeve
the cld equiprent: it tocck then half the time the 7EX pecple cxpeetedl
FF RRK
GCRDQN 7GW ncw meving ahcad fast, his tcwer is up teo 40ft. with cnly 10ft,
to go. Gerden has a THODXX rcady tc go cn tcp of it with an erctater te swing
it arcund, In the rcantime he is cn the air with the FT200 and G5RVantenna,
3% IR IR
LCCKS tec mnc likce Tasmenia cculd win the R.D. Trephy back altheugh corpetiticr
is tcugh, I havc ncever heard sc many VK4's cn the bands, Please hclp this State
gin by scnding in ycur Leog, rewcrber, if you haven't the time, give it to us
and we'll write it cut and scend it coff,
PR R FFH NN
CCULD bec GEELONG /MATEUR RADIC CLUB is geing tc lese scne rembers, I hear
DARYL 3AQR zot quite a greup together to oo skiing., Let's hepe they den't
get tee interested,
FRFFFNFRNHK
I WAS wendering why Tim 7ZX scld his FTDX100 but now we know, At the
last mceting he ordered a new FIDX401 frem the Neorthern Zone Ecuipment Steore
which we are still sclling (at the moment of writing) for %9465,00 »lus the
usual 5 for the zene, These prices will be likely to be higher when you
read this,
DULLETIN UF NURIMDIET U DD Welifeeoo e Olul LS UINL, |71 1
PAGE 3
= NORTH WESTERN ZONE NCTES
WE were all startled to sec a handscne picturc of 7Z5E in the leoecal paper;
- .
Turns out that Brien is aspiring tc loesl gevernment, Hepe you mak
We cculd do with the slidc rule in seme of cur local finances,
Ion E, i1s very busy lining up the cquiprint storc, He is using his art as
an cxpert carpenter in shaping scphisticat:d crntaincrs sc that we will sccn
have o mcbile stere,
Sid 7SF turncd up fren Melbcurne with a hean c¢f RSGB nublicaticns - encugh
tc start a bock shep. To cur surprisc they werc all snapped up very snartly at
the recting, and sc we nced rere, 4 very studicus crocwd the F.W, Zonef
Groeme Rend our ncw Treasurcr is tasing a firm hcld on the financcs cf the
Zene, end the reoney is starting te circulate, He cven dug a cheque cut of the
Sceretary's wallet which shows he has a nesc for the job, and the beys will be
kept in linc financially,
74X has been in Hebart again, If cver we saw 2 paid teurist - cnough seaid,
We were pleescd te sce RN 7AT at cur last rceting, It secrs that the cenfus
over his QTH has ncw bewn irencd cut and he is new get-at-able,
COL 7XW hacd a nice spcll cn the helicday coast, contributing to kceping then
alcft mecanwhilc, He was priviledeod to enter the junk shop - cr - shack of TMX
end nc deubt learmcd a great deal about the wreng wey te dc things,
DAVID S was closcly quizzed ebcut his inability te find L.7. in his maill
box., We suggested an eye test, snecak thieves and the F.B.I, cte. but was adarant
abcut it, Kcop heping Davidl
DICK 77DF was hcrne recently, dashing arcund in the lirmited tine abailable,
Cncc again the 7 MX junk shack was uniliscd, ard o specielised trensforner
knocked up for an intricatc plece of apnaratus that Dick has cn the skids, Never
a dull rcerent when ZDF is hermel
PETER cx 7ZPW has bcen in phene corrunieaticn with cur Zone, UWhy not 144 Pet
It has becn denc)
A0SO was "mailrcad" nct sc leng age when ZBE asked ZGLi to procurc a bettle
of lerenade cn the way cver, Sounds a bit fishyl
HAROLD 747 rccently carc inte a lecad of GSL cards, He was ricrely talding cver
the job of QSL Manarcr, MNe decubt thesce will be sorted and distributed in his
usual c¢fficicnt nanner,
THE fellowing is o list of officc bearers - N.W, Znc:
PRESIDEN T 746X TONY
VIGE PLESIDE'T 7KH KHI
il " 7SF SID
SECRETARY X MAX
TREASURER hAss, GRAFME RAND
QSL CFFICER Mz HARCLD
EQUIPMENT STORE Ass, I/ ELLINGS
Yeur cfficc becarers den't rind the werk invelved end they sclicit the
supnort of every rermber, Rell up te mectings and meke their jcb werthwhilc,
Let's nakc this e year te rerenber,
If anyone has dene anything peculiar, reritericus or funny latcly, plcasc
let your ccrrespencdent know, It might be news,
MMATEUR TELEVISIQN - (4. T.V.)
IN TRODUCTION
After much prerpting I have decided to write a shert sericls cr acticles
cn basic amateur television principles, Firstly let nc begin by stating that
thesc are only basic ideas and can be expanded te suit each and every necd, Meny
a ccrent when the word amateur tclevision is menticncd, has been T can't affcrd
that kind of roncy required for A.T,V,,." This kind of staterment cannct usually
be justified, as 4A.T.V, ac‘tifitics cen ccst nc rerc than any cther brench of cur
hobbj "/mateur Radic™, |
Thosc interested in receiving A.T.V, need cnly te acquirc a wide band UHF
converter, a small UHF acrial ancd conneet cutput of converter te acrial tefnifials
of a standard T.V, rcceiver with the tuncr set te chanel 1, The T.V. receiver
docs net require rodifying in any way., Intcrested yet., Read con,
Those interested in: the other encd of the ‘translrlissi‘on_vx;rill need a little
rorc gear, It tates quite a while te acquire the gear ncecssary for en A T.V,
station, and ocnsoqvuent.ly. a great deal of thcught is needed vhen getting this gear
together sc as the end result is werthwhile, It is usual tc set up your gear
firstly in the closcd circuit T.V. concept, and cnce the required perfornance is
cbtained, it cen bc connccted to a suiteble rmodulater and transritter, A glance at
your Regulaticns Handbeck pertaining tc A.T.V. cxperinents will show ycu the varicus
stancdards allowed, If starting frcn scratch, I suggest you go for the commercial
standards ctc, as thesc are not tee hard tc cbtain with present serdconducter cdevices,
The syncronising pulses forn the heart cf any television systen, thus several
designs shculd be persued, befcre this part of the gear is constructed., Cncc a
gocd syne, pulse gcneratcr has been eenstructed it ean betused with any form of VIDEC
whethcr it be frem a flying spet scemner or live T.V., Caera, It is strongly
sugpested that all these interested got tegether and pocl thelr design ideas to
achieve better rosults., Slow Scen Anmatcur Tclevisicn (SSATV) is another activity
and I ray have a little tc say cn this subject at scme futurc time, Next article
I will cutline the basic cquipnent requircnents for A.T.V., In the neantire start
thinking abcut thet A.T.V. converter and berrowing yocur "Scecnd Best Friend's™
T.V. rceeiver,
Y (VK7:X)
COMPLEMEN TARY SYMMETRY
What is complementary symmetry, and how does it work, Briefly:
Bipolar transistors have a singular adventage cver velves and unipolar
transistors in that they can be connected to perform push-pull PA operation
without the need for a phase-splitting driver-stage, This is accomplished by
using a matched pair of ccmplementary NPN and PP devices, Using the transistor
configuration shown (cormon ccllector) in the diagram, a very low impedance will
appear. across RL, NO TRANSFORMERS] Hence the use of low impedance speakers,
The stare may be operated as class A or AB, Since the standby currents
for each device flow in opposite directions through RL, there is no net d-c
voltage drop across this resistor. When. the incoming signal is going through
its positive half-cycle T1, the NPN transistor becomes more conductive than the
FNP -~ T2. During the next half-cycle, the opnosite is true; that is, the FNP
transistor becomes more ccnductive than the NPN device., The signal passed by
each device develops across RL in alternate half-cycle,s that reconstitute the
input wareform,
R1 end R2 form the forward blaclng for T1 end T2,
TREVOR 7TB.
+ surrly
INPUT
O = SuPply
330
e ePN
33R KN
DID YOU SEE those Tranaistor Basc conncctions last mcnth} You didn't, Maytb
it was beccause we were in such a hurry and ferget te put them in, mind you we
would never admit te it., Anyway here they are again,
G
. 21 s .C.
. -D -
p b
S
MPF /o1 1N3819 LN52465 MPF 2l Tr)an 5553
71588 2N 3564
_ 8’%11\!3565
BULLETIN CF NORTHEIN ZCNES W,I,4i, TAS, SEPTEMBEL, 1971,
PAGE 6
SYNCART (Synchrencus fnatcur Radic Transscnder (COPY BY CCURTESY
AMSAT NEWS:
T LETTER)
SYNCART, propescd te NASA as an wxperinent for the ATS-G Applicaticns Technclogy
Satellite, represents an ideal opportunity to achieve a highenower, long lifetime
aratcur comrmnicaticns rclay cn a synchrencus satellitc te be placed inte carthe
stationary orbit arcund 1975, ATS.G is planncd te erntein a thirty-feet parabelic
reflcetor capable of providing highegain carth coverage in the VHF anateur bands,
FMSAT has preposed to previde as part of this satellite, cn a nen--funded basis, a
twenty watt PEP linear rcpcater capeblc of handling 20 tc 50 amatcur transrissions
sirmltaneccusly using a frequency of approxinmately 145.,9 MHz for the amatcur-te-
satellite 1link, and approximatcly 432,2 MHz fer the satellite-te-arateur staticn
downlink,
SYMCART's projected lifetine of scveral ycars will effcetively cpen 200 KHgz
segnints of the twe rmeter and scventy centimcter amatcur bands for long-cdistance
usc by amatcurs in Ncrth, Central, and South Arcrica on a full-tine, cperaticnal
basis, : .
Although SYWCART, like all previcus OSCAR satcllites, 1s to be constructed
entirely cn a denated-time basis, it is expectcd that high-rcliability, quality-
centrolled cerponents will be nceded for SYNCART's leng planned lifetime in the
spece cnvironrent,
ALaL
WWWW s *.
o
SYN CALT
By Herry D, Hclfri ch W34
On Neverber 1, 1960 AMSAT subnitted a prepasal te NASA to build twe cxperincnts
for launch cn the ATS.G ( fpplications Technelegy Satcllite). Spacccraft, This
satcllite will be launched inte a ~cestationary (synchrencus-couaterial) orbit
in 1975. It will carry a 30 foct diametcr creetable dish entenna which is availablce
te cxperirenters, A peinting accuracy cf 40,10 and entenna size zives full carth
disk coverase, - The spacecraft locatien is nct finelly dcterrined but currantly
is planncd te be such as to give coverage of the whele Western herisphere,
The AMSAT prepesal was twe fcld, for a Dircet Broadcast Televisicn Experirent
end a 144 tc 432 VHz repeater., Althcugh net rejoctod by the ITASA selection nrocess,
cur nrcpesal did net make the final sclect list, cnly cne in 10 submissicns didi
Recently an experinent rcassessrent permiticd us te rosubmit the repeater perticn
of cur prcoesal, Proshucts are excellent ot this tire that we will be autherizcd
to launch an experiment as described belew on the ATS.G,
The cxperiment has been nared SWCLRT, (Synchrencus Anmateur Dadic Trenspender)
and will fulfill the cftwn stated roguest of cur rerbers that we attent a
synchrcncus reocater, Althcugh the launch date is scverel ycars off, building an
cxperiment to mcet NASA's rigorcus stendards will be a demanding job, Parts and
whole experirent qualification and testing will tax 21SAT's tcehnical obility far
rorc than has eilther OSCLL »nrograrn, If finelly sclcectcd, we can be preud of
attaining this "scientific cxperirenter! stature, Extracts fren our tcchnical
nrenosel fellow, (Mext Month)
FEIH RN K
THE NORTHERY ECUIPMENT STORE heas a let of NEW gcodies cn order for you
and the felleowing should be available shortly:
COMPLETE KITS FOR THE TAA300 AUDIC AMP, - Approx. “4.50 each
50 Or 75 CHY DUMI'Y LOAD KIT 20 WATT - $1.20 each
DUM Y LCAD .. WATIMETER (USING 2% /v I TLTIVETER) 43,20 each
SPEAKERS 8 chms AN 42,00 cach
SINCART, propesed
tc EASE a5 en &xnerlm‘f'fln'
Satellite, represents an icezl cppertunity fo achieve 2 Bigh-oouer, long :
arateur ocmmlcatlcns relay cn a synchrencus satellitc e be nlaced Into %
staticnary orbit arcund 1975, ATS-G is planmed ¢ cntain 2 thirtyfoct M
reflecctor capable of providing high-gain carth ccvwerage in the VAF ao=teur bemes,
MSAT has preposed te provide as part of this satellite, cn a ncn-funded basis, &
twenty watt PEP linear recpcater capeblc cf handling 20 tc 50 amatcur transmissiens
sirmltanecusly using a frequency of approxinetely 145,9 MHz for the amatour—te-
satellite link, and approximately 432,2 MHz fer the satellite-to-amateur statien
downlink,
SWICART's projected lifetinme of scveral ycars will effcctively cpen 200 XHz
segnints of the twe reter and scvonty centincter amatcur bands for long-distance
usc by amateurs in Nerth, Central, mnd South Arcrica on a full-time, cperaticnal
basis,
M though SYWCART, like all previcus OSCAR satcllltc,s, is to be censtructed
entirely on a donatcc_tlnc basis, it is expected that high-rcliability, quality-
centrolled cerponents will bo,ncu‘cc‘ fer SYNCART's leng plannu lifectime in the
spece cnvironrent,
NK
SYN CART
By Herry D. Hclfrich WBZE‘:{
On Nevember 1, 1969 AMSAT subritted a prepddal te NASA te build twe cxperircnts
for launch cn the ATS.G (#pplications Tecehnclegy Satellite) Spacceraft, This
satcllite will be launched inte a ~cestationary (synchrencus-couaterial) orbit
in 1975, o 30 foct diametcr crectable dish entenna which is availablc
It will carry
te cxperirenters., A pc:mt:mg accuracy cf 40,10 and antenna size gives full carth
disk coverase, - The spacecraft lecatien is nct finelly cdoterrined but currently
is planncd to be such as to give ceverage of the whele Western herisphere,
The AMSAT prepesal was twe fcld, for a Dircct Broadcast Televisicn Experirent
and a 144 tc 432VHz repeater, Althavu&h nct rojoectedby the MASA selcetion nrocess,
cur nrcpesal did net meke the final sclect list, cnly cne in 10 subrissicns didi
Recently an experinent rcassessment permitted us te resubmit the repcater perticn
of cur prcoesal, Proshucts are excellentot this tire that we will be autherized
to launch an experiment as deseribed belew on the ATS.G,
The cxperiment has been nared SWCLRT, (Synchrencus Amateur Radic Transpender)
and will fulfill the cfton stated regquest of cur rerbers that we atternt a
synchrencus reneater, Altheugh the lawnch date is scverel ycars off, bullding an
experiment to rmcet WASA's rigorcus standards will be a demanding job, Parts and
whole cxperiment qualification and testing will tax AISAT's tcchnical 2bility far
norc then has cithcr CSCLIX nrogram, If finelly sclcected, we can be precud of
attaining this U"scientific cxperirenter' stature, Extracts frem cur tcchnical
nrenosal fellow, (Mext Month)
FERF R
H NN KK
THE VORTHERY EQUIPMENT STORE has a lct of NEW gecodies cn order fcr you
and the fcllowing should be available shortlys
COMPLETE KITS FCR THE TAA300 AUDIC AMP, - Approx. 54,50 each
50 Or 75 CHM DUMY LOAD KIT 20 WATT = $1,20 each
DUM Y LOAD - WATTMETER (USING 20k/v ' ULTIVETER) 43,20 each
SPIEAKERS 8 chms AM 2,00 cach
A 1,70 c=ch
3n #1.40 cach
23/411,2710_%2_41:" ¢1.20 each
Malke certain you den't miss cut, and order any cf the abcve items at the next
meeting frem KEVIN 77Z:H cr JOHY 7JV,
s eheve clrevit, usirs a TAAO I.C, will give an output
of approx. 1 Watt intc r 8 ohm specakcr, A 15 ohm spkr.
may be used with a slight decrease in power output, 8 chr
is the minimum load impedance that can be used,
Supply rail should be 9 volts with a maximum of 10 wolts (NOT 12V). This
unit can be used for a variety of purposes — from a crystal set amplifier to an
audic stage in a Receiver, It can be made up on a small P,C, board,
SugeesTEDd P.L. BoARD
ml~
2
3"%
VI1
TRT —
Z 7 7—m74"
)
q
/o LA\ !
1 ST
=
8 3 91’3
7 2 5 \ \?J
7TAA 300
VIEWED FRor A BOVE
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