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BT V- -4 11 o
. ULLETIN ISSUED DY THE NCRTHERN Z(NES CF THE
‘I ‘ RELESS INSTITUTE CF AUSTRALIA TASMANIAV DIVISICN
) :
JULY
VL, 2Nc. 4
REGISTERED AT G,P.(, HCBART
fer transmissicn by pest as :
a Pericdical CATEGCRY 2, PRICE 5¢
This is to remind ocur asscciate merbers that applications for the ACCP
and ACLCP exeninaticns to be held con Tuesduy 15th August will have to be in
the hands of the Superintendent Radic Branch on the 8th July. Each applicaticn
rust be accecrmpenied by a ccpy of your birth certificate and the fee of $2,00.
The exarination ccnsists of a written exanination of 2} hcurs duration on
Redic theery and another of 30 finutes duration cn Regulations, Tc secure a
pass in these subjccts you rust cbtain at least 707 cf the total marks alletted
in cach,
Yeu'll only have a few days left tc get your anplicaticn in the mail so
dc it now! If ycu den't think you are ready, dec the exanm anyway. You might
be surnrised and if yecu dc fail, you will be notified what your marks were, thus
giving you scre idea and how well ycu knew the sub;j ect,
I have scre applicaticn forms for these that need cne, all ycu have to de
is ask,
JCHN, VK74V
F 3F 31 3
MEETINGS
July 4th North West Zene at Lokin's Hell, Ulverstone
July 14th Northem Zcne at A.E.B, Reomws, 51 York Street
Launcesten,
JRCS_CLASSES
July 15th & 2th 10,0@am, Rcem 38 Kings Meudows High Schocl.
August 3rd I.R.E,E, Lecture cn Cerrumicaticns by
Mr, R. S, Glquhcun, Ges Cc, Shcowrooms,
St. John Street,
Q. Ro M. :
BULLETIN (F NCRTHERN Z(NES W.7.A4A, TAS, JULY, 1972
PAGE 2
Twenty seven persons attended the Jun. mocting, Discussicn took nlace on
repeater planning and clubroom,
A new position, Fund Raising and Publicity (cddicer was created and Jehn 7JV
was appointed to the post,
Four a-plicaticons for W,I.A. membership were passed on to Council for their
consiceration. - :
G. ‘e Groot VK7ZGD (full)
P. Feltham (csscciate)
P, Szcka (stucent)
P. fslow (student)
To streanline business at ncrmal mectings it has been decided to hold
executive rmcetings the weck before each general mectino, If rwitbers feel
there are matters that shculd be aired at such a tirme rather then cpen
mectings shcak to an cxecutive member about it,
A talk on AINT - 3 transmitting couiprent was very ably delivered by
8111 7AK, His lucid cxolanations led us threcuzh the corplete system right te
the top of the 200ft, aerial tower,
The July 14th meefing will be a mermber's slide cvening - bring along
abcut 6 slides of elcctrenic subjects, Remermber your bi-ini girl rust be at
least carrying a transister,
Rurcur has it that an equinment disnlay nicht is nct far off - be preparedi
hcocater Conference
A conference will be held in Wodonga on July 1st, P ter 7PF will be
representing the state, Matters requiring censicderation include
(a)chensed frequency channels,
(t)i'ent problems,
¢)allocation cf channels,
NNN
7))
tene eentrel.
¢)1lirkin - repeaters,
Adventacs in using the same channcl as Geelong/Tralalgon were pointed out -
casier to snot band opcnings and increasecd likelyhcod cf DX contact.
Chenncl chen.ces are expected to be made at the beginning of December, Current
iceas are to rmove transrit frequencies above receive channels and place a new
sirplex channel bcetween them, If onyenc has any brilliant idcas no deubt Poter
weuld anpreciate hearing frem you befere the conference,
Nerthern Clubrocms
Councils in the Lounccsten arca are to be approached to establish if lease-
held land right be available for our usc, GRoguests arc alse teo be made for land
for suggestions as te arcas where frechold land weuld be of use to us, With
a definite plan in rmind it was felt ocur roney-raising efforts would be rerc fruitful,
(nce a~ain - ideas please,
Theery Classcs
With the help of Wal 7ZwX Drian 7RR the WIA's Launcesten YiCS classcs ncow
rccts in twe sroups., The advanced gr-up ray be ‘of assistance to non scheel students
sudying towards ACCP exams, Teaching notes and assignronts sct for this grcup
would, no doubt, alse be helpful, If you went help in this dircetion - whether
beginner or near ACCP level -~ contact 7KK, Phenc 0p3 - 444181,
PAGE 3
NEWS F(M THE NCRTH WEST
(n the last weekend in May four reobiles, 7AX, "MX 7ZIE ancd 7ZA% crganised
a 2M ™ safari into the hinterland, Twe units travelled fren Forth via Wilrot
end Mcina, and the other twe via Sheffield all mceting at the Mr., Claude leckout,
From there they continucd at intervals to Leronthyre picenic arca for a barbecue
lunch, Sore interesting and surprising cormrmunication took place and a great
deal was learmed frem the day out, The weather was perfect and the bush beauti-
ful end cveryonce agreed that there will be rore of this scrt of exercise,
Associate Clen tagged along and helped with the fire,
(n the nights of 28th and 29th May, 2 metres cpened but late in the
evening, C(ur June mceting went off very well with 11 in attcndance incluc‘;ing;'v
Ken 7AI whem we were very nleased tc see, The prepescd 1973 Jubilee award
was discussed and the mecting apreed that the crganiscrs have dene a fine job,
Several of the boys collected in Tony's irmmaculate shack fer en after mceting
ragchew, some collecting wives who habitually keep Reosemary company while the
one presicdent cencducts fhe reeting, Thanks Rosemary,
The 2M band is very lively here as several cperaters can work through
channel /4 repcater, Drian 7ZDE explained that he was "having a Tall" since
discevering that he can work via the repeater,
My forecast re 7TT is workins out, He has been heard faintly con the
Suncday call back, Keep stcking Terry,
MK
NN KN ‘
PETER VK7PF will be attcnding the repcater conference in WODCNGA in July te
discuss repcater channel frequencics armengst cther things sc if you intend
buying Ch 4 Xtals ycu had better wait until we hear the cutceemne of this
ccnference,
3636 P03 HK K
I'EN VK7DK was in Hebart fer a ccuple of weeks studying up cn VHF techniques,
May be he'll put scme of his knowle dge to work on the amateur VHF bands,
3036 HI I3 RN
NC MCRE Indien .wrestling for a while for ERIC VK7EC, thc last beut resulted
in a brcken thurbl
JEEH KNN3 %
THE 2 mctre band is geing cragyysc far this year therc hasn't been a week withcut
2 metres opening to VK3 even if cnly fer a ccuple of hours.
KR RAR TR HK
(ffers arc invited fcr the follcwing ecuipment fron the estate of the
late Dr, Ian Pearscn, For further information apply to MAX IVES, VETME, 4
3CX 12, EAST DEV(NP(RT, PHCNE 278946 or musiness 241911.
1. Yacsu FIPX400 Transcciver, with P,T,T. mike, fcoct contrels
and fan attached
2. Specker to mateh abeve
3, TH6IXX Trap tuncd Duan with cc-ax cable
Le Erctator Mtenna Retatcr 1100M with 7 cere contrcl cable
and centrel wmit
5. 14AVC Vertical Mmtcenna with Co-ax cable,
6. futeratic Keyer Model ETM2
7. Kyoritsu Model K108 SWR Mcter
8. Pair Foster RDF207 Sterec Hcadphones
9. 3 Positicn Co--axial Switch
10. FF30DX Lowpass Filter
11. Astetic T3 Crystal Micrcphone
12, Heathkit F,M, tuncr FM34, 7 Valve Linc-up 88.108 Yhz
Asc the fellowing Technical books -
1968 ., S.G.3, Handbeck .. SS3 ARRL Handlxo'r -~ Radic Engincers
Hendbcok - DBasice Mathcmatice (Macdcl) - Applied Mathcratics
for Redic Engineers - Dasic Nadic (J. “arten Hoax)
33 3933
33K
GRERN JAPAVESE CERAMIC CAPICITCR MARKINGS (7y Ceurtcsy G.A.R.C.)
Several pceple have cxoresscd difficulty in dotermining the actual
value cf conacitcrs currently being sold,
The markings on the capacitors at first anpear tc be risleading,
but they are in fact a variation on the standard cclour ccde type of marking,
MARKIN G ACTUAL VALUE
LYAMPLES: |
471 — e LTONTF
222 e D2000F
102 e 1000pF
Fromn the above exarles, it can be scen that the first two dizits
nean what they say, but the third digit is thc cnc to watch, It in foct
indicates the number of zero's te append to the first twe nurbers, Fron
the final exarple akove, it can be secn that we den't have 102pF but 10
followed by twe zcerc's making 1000pF.
MCTE: This applies te capacitive valucs over 99 conly, as for exarple
a 47>F is markcd just 47. '
REISITCR/P( TEN TICHETER CIRCUIT TTAGRAT MARKINGS:
Most circultry and some corpenents of Burcnecan origin ermley a marking
systen which has lcad te scome confusion,
EX/MPLES:
1K5 o+ s 1.5k Chnm
M2 - 2. AT Chn
6K8 i e 6,8k Chn
68K e 6% Chn
This systen is quite sirple, it sirply invelves replacing the dedimal
point with the rmltiplicr syrbel, Thus overcrming the Hretlen of determining
whother the spet on the pase is really a dceiral neint.
T . - B - SN
DULLETING CF NCRTHER® ZFES W, L 4 TS
EQUIPMENT STCRE NCTES
We have just obtained a corpletc range of rcsistors and are holding
up to 100 of the popular valucs,
Fibreglass blanks for 5/8 ware whips on 2 metres and helical whips
for H.F, arec still available at $1.70 cach,
We also have a zood ranre of ceramic capacitors 50V, Price is only
5¢ each,
Printidl circui.t board has becn ordered and we may have it for the
next meecting,
3HH KK
3333
CEUBRCCM ACCCUNT
We have deposited the first $100,00 so are off to a good start, If
you have sold the tickets pleasc contact Johm 7JV for rore if required,
John still has available the following iters, the proceeds of which will
tc go the account,
3-30 PF bechive trirmers chassis rounting type at 30¢ each.
D type Xtall sockets (chassis rounting) 20¢ ecach
8Ft lengths 12 core cable good for contrel purnoses or
strip for Hook up wire - $1,00 per length
Used 6" speakers in Iox (ex Mobiles) 3 and 15 ohm- $1.00
FH I NNK
was stolen from a car in Lawnceston, should this equipment be offercd to you
pleasc notify the Pclice or NCRM RICHARDSCN at S,T.C., Phone 312511 and ask
for STC.
FHHHHHINNHN
THE I.R.E,E, invitcd Northem amatcurs te-attend a lecture by Peter White
on HYPERDCLIC NAVIGATICNAL SYSTEMS which included the Lc;'an s Lecca and the
(rega systems, We have again been invited teo attend a lecture by Mr, R.S.
(STEVE) CCLQUHCUN on Corrumications on 3rd Augfist in thc Gas Company Showrcoons,
FHH I KRR
CULLETIN (F RCRTHEIX Z(R=Ss W, I. A, Ti5, JCLY, 1
PAGE 6
The shortwave band included cn scre transister portables can be nade useful
for fex hunting or gencrel purpose receiving by rcens of a few sirple medifi-
caticns,
(a) Criginal performance on typicael unit
(1) tuning rate quite irpeossible on 40Mx .
(11) Coverage 3.9 to 15 Mhz r
(111) Pcer sensitivity at hish end .
(b) Modificoticns
4 Fr \WHIP
/A db Tun £
’5'6 S
ADdD
- 2777
7o/\7/15R
= 0S¢ .
Coil
/ AERIAL Corl
AdD 2 TurRn
3 (c) Effeccts ~
(1) Ad0ing turns to acriel coil (en? finc tuning by sliding
ccil aleng ferrite rod) plus screwing in oscillator
sluz, lcwers tuning ran-c te inclucde 80Mx
(11) Ading 27PF nadders bandsihreads 40Mx naxirmun frequency
is ncw 7,5Mhz keen WG fer tire checks and frequency
narkcr
(111) The 56h choke, ex corputer beard is necessary as e
lcadin ¢ ccil, sincc a 4Ft whip hardly & .roaches o
rcsonant length cn 40Mx (akout 33 ft.)
tunc entenna by edjusting length this is nct critical
since the circuits arc sc long, though the irpreoverxnt
in sensitivity is really astounding,
Note that previded it is rescnant the ammunt of signel 5
delivered by a short whin is independent of its length
therc is no peint of installing a ten fect tarl whipn .
cr scre such, -
(@) Vherc receiver use is quasi pertalblc cxtermal battcries or
mains sunply cen be connected via the hcadphone jack
(ctherwisc disuscd) autcrmatically disconnceting the intornal
sup -ly when plug is pushcd in
(¢) Ccteceting SSD KIS
bV JMA
= B(W//( WoRK
l l oy 12 v
227
Bt
JYIETHOD OF
[NJECTION
SecovbiF AMP
% This velve should Lc as large as possiblc whilc still starting €,K, To
ensure a clean waveform and stability its actusl veluc cdenonds ¢n the gain of
the transister
DIC: VK7ZLF,
CIRCUIT CCNTINUED FRCM LAST MCONTH
B+
Ol 0 0
téoe W/
o T too AF
- SV
- ]" -
G 200V
. RL+ x " 19‘t;
- M 500 V
Iw
< 1AV Ac¢
7/
- | HOHE ‘k
H R _350”»/
A N
FFRHIHIHN
RR RNAHR
The Faraday lccturc will be held live in Lavncesten on the 18th of
Cctebery this is a lecturc of World class and I an tcld rccuircs a truck-
lead of cquiprent, It will be held in the upstairs Gallcry of the Muscun
¢ © %@
and tickcts will be available frec teo all nembers cf the Nerthern Zoncs,
If you intend te attend this lecturc pleasc nctify cur Secretary, LEG
VE7KK as sccen as nessible sco that arrengerints can be nade,
TFEFI IR
N 3 KUK
JOE VK7ZGJ has becn having regular skeds on 6 rnotres meteer scatter
with VESZWW avera:c sipnal rcports arc 4/3 with cccasional bursts of 5/9.
F IRHANHK
Heard JACK VK7JZ mention that hn, had a ccntact on 160 metres with the
U,8. 4. repert was 5/7/9.
PR IR R R RHRHK
BCD VR7ZRG found a spuricus signal when tuning his rceceiver, after
much scarching fcund it was the local cscillatcr ¢f his F.M, unit left
switched on in the cari
FeH AW IR
RKKINK
I have beon infermed that the Launcesten Refcrence Library is open
until 10PM cn weck days and Saturcday frem 9.30anm until 6,00pm end have
the follewing ma~azines — Wireless World in Zound Velunes, Elcctrenics
fustralia in Tound Velurws, A W, T., Popular Elcctronics (USA) end the
IZEE Jcumal. Phote ernics arc available cn the spet at a low cost,