SKM C450i24093012290
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THE mRELESS^ . INSThTUTE
OF AiJSTF^'^LIA
Tascanian Division
MONTHLY BULLETIN. Box 851J G,P. O:, AUGUST 1961.
HOBART.
PR5SIDENT. TREASURER. SECRETA. RY'*
Mr, T. Alien. Mr. G . Harris s on. < Mr. K^Ma-llin*
^*.]'VK7AL;""' ""'VK7CH. \ . , . . ^ _VK7ia..
^£.iifcS.rSd-a^. G...£«^«_H2b^r^,_f^r_-b^a.^sM^s^o^
'
b^y^P^s^' T^o^i^a^._
^s_a_pC
GEKERA. L MEETIM5. , . _ .. _ ... ^._..,.„... ..
The nex-b General Meeting. of the Tasmani&n Dixiaion w
a-fc -the CIiub"Rooms/14. 7. Uv©r'pool"St. on Wednesday, August &ad. at 2000 Hrs.
".':. '^'- '.i'Visitors will be welobae, as always,
The. Leo-ture -this month will be given by Mr. -A»H.Morrisby, and is
entitled "Basic Reoeiver Besign." This sub jeot^ is • always ^n^n-beres-b^one,
a^-fchis one'by AJ.an-will prove no exoeption and no doub^ will as^is-b
M5b"£s~wh<3"are interested'in construoting one of_-fchese days ^e ttreGei'VQr^
^d'a'll reoeivers'1. H&ven'l; fe long-range weather ^oreoast forvisitor
.'t;hls, nleht'.
irs h^uldn«t~be--boo oold (I hope)~so oome along and bring a® well,
a
i•
'"fr . rr' u-nbnTTT;.
On AuRUst 16-bh. next ^he V. H. F. Group will hold^-fc^ ae^^mQe-bing^
last Meet^g"at3T&st~ooUeo-fcion of equipmen-fc was ass.eiribled^fc^jla^^^
SSe ^euanmal''auotion7chief amongst'it ms; a o. r. o, .and-.. marker ^generajfeor
afad noise Kener&tor wit;h ass ooiated equipment. Eeoeivers, supplied by^K7'*s
Wf^ Ej7z&^"ZAV'and ZAO were put through-bheir A mber
paoes. cu
^^^"we^e"'obtained'of;unoertain signigioanoe. №^n6ure3,,°_f ^b;
^r'r^sured .fro^6ES8"Casoode stages-and ^^.^or^^^2Mx 6CW 4
• Nuvis. -bor'set^. ' (Refer V. H. F.Handbook page 206, Bryan).
-6-ix. On Saturday 8th. ;J.uly, . many were_oaught unexpectedly ;y^^Pen^n6
t ^K2^VK4'a*nd'VKre^e^6^r;^ ^^i9^^8 OT^"^'^^^
adipole, A repea-b perforni&noewas staged on Tues'day llth. 'wi-th VK5.....
Aotivi^y. as inigh-b be exPeo'bed«as,but
down'__^ _ ^^ ^^ VK7%AT. 2%CF and
MU. U.^rS;^h9d^o"arou^90'Mc/s, searoh_on 2tIIX'*^y7K
a
mI
^22CF,
SzDRrpr^rdt l^g^i^:;The^o^l^tribul^ce^etw^^^^^
N^oa^irpoiSr(85'Mo/s)-and a picture was seen from ABN2 until the
local ^^^^ „, ^ >E^"??_°f. 25 M°A t°lVlntar ternoai°5-
NOTE. PAY PARTICUIAR ATTENTION AROUND AUGUST 4-fch.
2:M* This band has-been shc^,ng_the best, fo^reoe^^^^^ni^to
tryboing^^ay"wheTaround~8\stat^
t£^^.€^^E^^S^a^
. 0^'^
S^noukeep°aTl^e'w^h"at"ali-^mes, partioularly be^een I9SO and
z^^^^^^y^^^^
,
: ^l^l?S?SSSS^^^h
Inter Wo meters is .m the .news. .a.t _-bhe^mo,raent. ^_^., _^ ^^
7K4< havel^erhra rd^n^K3"v3.
rs por. ad:LoE, propagation- seetos this baic
^m,it^S V^^. oporrior. i° usinE'a par.»eteic .»pllfi.r ^
SSB -brans mis s ion on 2 rnx. ........•'
VK4ZAA"works 150 miles using_5_22^eq ^iPmen-fc,both_ends:,
^^winr^oS^rw
orks"JK 3NN-(2^0 mnesj^v;7^h^^^ ^.
^S Spt^s^^Ve^anE'J. P. of" 10 №. without-exoe. ding the limit.
I , . ",. ..
The Monteh^:'-Bulletin of TheWir'pless ^nsM-bwfee of AAs£r&liaA ; ". '. ^\^
Tasmanian Division. : • Page. 2. .. .. 'Augtist;^96. 1i_ -• ; ; ^ ; •'• ^ ••"•• "
The focegoJLng V. H. F^.,Not;QS oompiled
-'••^ . ' '.
a, ;nd
:
-signed
• • \ :
by R. Eme-b-fc VK7Z&0<
Las^.Me-sMn',^ 6 Mergers a-b^ended .this Mes-bing'whioh was devo-bed, for the
e ter par , -bo business. ' ' .. _ .. , - ., ". ;_'^_ .-:
"It'was suggestod tiy -bhe Seo.re.-b&ry, Mike Jenner, that -fchere be •&
re-e.le.o-tiC)Q..cii' Officers. ^ , ,„ .,.
:^~/"T'motion was pu-b forward, by •E^. Eoge^_thatowing th the Number^Pr^-,
seirt thQ'^lootion should'be'hei^in'NcwetAey^This was_se20n(ifdjLK^?fr'
7:Mloh&ei"MlIiains, 'one-of-our n6w members, suggested t hat. ••ws1 should-
have a demoris-tra-bion-on-building.. gear aad. -b'es-b^.pg, s^im. a-t^ one of our^fufcurs
meetings. . . »„ " '„ '_", "_ "lr>-_ i.. -! 1:1 -'•
" ':Tn. oo_ri^G-bion..w.Hh this we hay e received offers^ of parts. for tTflld-
' "'
-ing' m7< c^iroerters-frQni^K7LE'&nd yE 'TG'T-'aBd ;:Qae,. :o-bher whose t:iame-I-do'inpt^-
know. The senior members will, :of .d6upse,".&Iso hacre .^.soratah^abou-t; in •fcBaeir
junk'boxes. Any offers of gear will b'e['gr&'fee?ylly ac cepted, ;'either
of oom-
piete'oowerters, of whiohuthere must be many not in use, "or -parts to
^•ome with'. an. I^>F.. .of 1600 Ko/s . . .,, ;,. ;,
;• •'Next M&atlng^ . ; . :. r .. ,. . '• -' ,'•'.. ; ;:";^ . •":^::1:'„. < . ^:- ..... __ , "^;::-.Lt^:'
s wa^'*h&. aas:e last month'we ahve:w;thi^g .deflni-te ^planne
next raoe-bing. but^tneiAers, will'^e •rioMfied via. 1yK7ffI;. ^:. soQXl^a^ ^xe' L@a^ur, s.,
Conaiii'fcte^ .has arranged's onie^hitig. ^ ;"'; •;:'-. ::;,;.;, , ;: ^^^. ... .^ ^'^/' •-i-:'i ;^'.'!
••'•^Listfene'c';s Re or-tSt.. • .. . " ' '• :'i-"^~-"-^ ^ ""^-•.•.•i-. . ^^,:•,.:••: . . ^.^r^l'_" '
y p ea ast motfth'has borne no-fr.us.t; a"d'^* tfe^im®':of1''ltl'ti111^
I feiawe not reoeived any news. I REPEAT. PLEASE WRITE and le-t m&k. now^ha-b^
•Y0№are7hear ing, : what you are doing and what you know of the aotivi-fcies of
o-bTier S^r.L.'s. 'i&. your^ioinl-by.; ' :. "•-•^::. . •" '-----'--'-:-. '.....
Inters-bfa-te'Ifews...,. ,, . _ ;, ..••^^ • _"^r"^i^". ;. -'.... ' -, - . , _.. ^^....-^_;
" '.. 7 ery'U-ttle has"yeen heard ,of min.land^a^fcivitie^
Fisher'tei-tes to Maurioe'<!oiK;ln Victoria . and ftead. one of №ui-le«'3-;^letters at
the l&st'wet^g. ^virioe.,wr^;'!a^8ry- inter^st^ng^ and ^ottld like -bo
'-•hear :№onv other VK7 S jy*L. ( s. -?His'address Is i^."A«R, "* ; . /':\ ^
: • ;(S igne<3:'): .Mike,, Jenner .'•Hon. " Seo.
'• • -. / . ~ .., : ., -. .. •:S^T. L. Group.
,,(M'ik'e also!g©nt . a Tephiiioal ar-bi. ole on building a Ht. F. Conver-ter:'bu-fc I
will teep thaA^'o.no.uptil;/next i^bfrfh. ;:Ed») •i ;1 •,, ^^-^-•• ••^-^^.
NOBTH-VTE8TBRNSONE. ' "; ' .. r. . ^ ••:. ;; , , ,.
The Annual Genera I-Ms e-bing of • this' gone will •take plaQe rn Lakin»s
"~ .H^ll, Ulverstone,. -on :August;ls. t. afr 200G •hrs'. %dn© ^Membors ^ace^requested to
. be preserrfc*'''-' ' "•;•:, '. - • . .., ; '•_'• . '".. ''. '' .. .•;^-
The las't Mee-fcing. of •t;he Zone'went'off.. v.ery. well and'. -fch^. 'audtionroas
s, •b. ill going s-brong a-b midnigh-b. The LeQture oh S . S ,B,. T3y, Keti.,Sa'xon proved
very ins •t'iruo-bive, as antioipated* .. •
- "•:! U. ;P 0 'R. T A NT.. •"
The Burnie Amouianoe nga e is' now in full_opera-fcion bu-b^are
• '. despfeFfi-fcoly short- of opor&tqrs, and YOUR help is needed ...A
lieenoe: is" ND^. required ^,6'operate -bhis sta-bion so As6«o^&t;e^
Menib©p:s :o:ah ^.e...in if as'.well as Full-M. GBib.prs. Remernb er tha-t the
inore^opera-bors *he.re &.re^he;;tTOge^'w;ill-T3€ -the tine between your
period on. BE 117 IT. •V:—''. - :.
•NORTHERN ZONE. '-;./; •;, '':^ •'.•__:• ! •. ^;-_.. -....,•...., ^,. ,.___ ^3. ^^.^ »_4-4,
At'^im6\ofw'iting. Roinforrria't;fon but:'guess A-laa-b the Meeting
held on -the usual night somewhere or o'fche'r. : •.?••
': 'Ths Division, l^s' reQetved, fr. ptn:. -blic. Hoii' Scor'@-ba. ryi VK2 'S X. L. Group^a yory
''•w0l]"^bno;r&pritA: of'-bN,^?7^R^.A^.' 'feoeiver:. T'!Y^-lnaa^al_i^TTT^?:e"t;o
aUWP. i^'.^mbcr.e;efb-":10/-. ^plus postage ;if .applio'ab. le^and is^ob-b^inabl^
direo-b-from-the Eon. Seo'retairyVK2 S'^W. L. Group №. D. G. ;AUenWIA-L^^l&,
Box''1734'G'.P. O* 'Sydney.. ;.I-b is~antioipa-fced tha-b other p.o.pular^isposa^s
eauiomeirt witl-'.also be a7ail^ble':in'sirtilaF form An ..•&he'-nGaF. Future. Tffihen
•bhis'"is~-fco hand you will be advis6d in"'tRis:'Bul. Ie-bin, . in the roeantirne^any
ono''wiio'wairfcs':th^''aoFO- o^-bheAR? can't do. be-bter ; than; to purchase the
manual now .availableo ' ;: . './•'/'•';i ^' .^
The Mon-fchly Bulle-bin of The Wireless Ins •ti-bu'te of Australia.
Tasma-nian Division* Page 3 August 1961.
GEORGE TOfffl •RA. DIO CLUB. , - .
This Club, under, the able leadership of George, VK7GC is getting
under way a nd -the Boy Soouts in •bhe area, as well as •fche young lads who
are not Soouts are very. keen on radio as a hobby. An urgen-fc requtrement a-b
moaen't is a rnultiniQ-fcer, in or out of order. If YOU have one of these
ar-biolos that yo,u Ash-, t>o. dona'te •t;o the clu'b, then George will be very
pleased to hear from you.
CAREERS AND HOBBIES EBfflIBrPION.
Tha riobart Junior Chamber of Commeroe in-bonds •bo oonduot a
Careess and Hobbies Exhib-i-bion in •fcho City liall from 5th. to 9th. Sep't.
inclusive, from lla. pi. to 10 p.m. eaoh day. The Insti-fcufce^in-fcends^-fco^
exhibi-fc for which sub-oommi-btee was flormed at ti he las'l;
arrange an pnrpose a
General Mse-fcing, :Final dot&ils will be worked out a-b •the neart general
Mee-tiiig, so if YOU have any ideas and/or able -to assist in •this pro^eo-b
•then we will be very pleased to hear fron you, Wo aro going -bo do^i't^and
want some-bhing worth while, especially &s quite a lot of good publicity
oan aoorue from suoh an exhibition*
JAMB OREE-ON-THE-AI R.
VK7»s AB, JB, ZZ, SF, KA, and 21M members listed las'fc uonth^haye
volun-beered -to bo in'i't this'year. The V. H. F. Group hopes -fco be able -bo
arrange a V. H. F. link be'fcwoen sta-bions, a-b leas-fc tn the Southern area*
VK7JB a-fc leas-b will be por-fcable. The -bime again is Oo-to'ber 21s-t, & 22nd*
Won'-fc be long before tha.'t is here eithsr.
REIffiMBRAKCE DAY CONTEST. 1961,
. The Con-fces-b this year will be held on BSth. and 13-th. August. If you
want Tasmanian to rstain -bhe Trophy this ysar -fchen i-b is up -bo YOU, Ge-b on
®s long a s you oan and work as many sta-bions as you o an, you arowhom
guaran'teed
lot "Sf fun" and fellow amateur s
of we
a you will meet again some our
only'seem -bo oontao-b onoe a year; during -bhe R.D.,Contes^,VKWI, wn1^,
in'opera-bion defini-bsly on Sunday mornnng from 1000 to 1200 operator
(no-t^-bhe first -fciine that Toin has'us od -bhat oall) and voluntsers for o-bher
•times ars noede'd. If your own rig isn't in going order then arrange to go
VKTWIor -to neares-fc ao'fcive s-tation and ati leasib work enou6h
along to your
to put in & log. ALSO DON* T FOR&ET. After taking par'fc in 'the Goutes'fc* ^or,
Pe-be»s sake send ?^~log in. Your efforts are was'fced wi-fchout i-b. Good luok
in •the Con-fces-fc and hope •(; hat aondi-bions are kind to us this year.
FEDERAL CONVS^TTION.
T'e next; Federal Convention will 'b_G_held a-t Perth. W»A., ^next_yeaa-,
In -the meantime"if you have any items which YOU wan-b oonsudero'
Con7en-tion"mrST is -bho time -bo lo.-b us knoiv about them. A-b present we hav_e
three"items, "one from the Northorn Zone and two fron •bh©_ last General^M^-bing
AlT-bhe'ias-b'Genor&l MeQting it was proposed •bha-bLirai-fced Lioenoees be^aU^ed
to use 28-30-Mo/s. -Also, thai; Limi-fced Lioenoees be allcwed to operate C<W.
on their lioe noed bands on passing a 5 w. p. m. oode -bes-b. Onoe again^ if
YOU'want sotadshing done which you think will further the interests
"^S Ins-fci'fcu-fcc wri'fce and let us know, N 0 W.
SECOND ALL ASIAN DX CONTEST.
"Your''a:bt;ention is drawn -bo the faot that this co ntest will_be held
from AuKust'26th. '(1000 hrs^ -bo 27-bh. Augus-b (1600_hrs) . -both •fcimosGMI.
R'nles"&?o~published~in "A. R. " for July 1961. CW only but is good fun
notwi-bhs-tanding •
07EEDUE SUBSCRIPTIONS. . . _ _ .., ^^_. ^. ___.. 4. ^^4,
'•bo tto fa ct that 28 raenibers t. his year_omittod -to^pay
dUGS*'"it"^as"l3eon found nooess^y to dolotc said 28
co mber s
from
tho^
^Soulation"Ust for^a^'eur Radio"". It .is hoped that ^ose^nierabers wiU "
do^hrr i6ht~;bhing"aud 'pay up bu-b, in tho raoantime, no^A.E. This ^umb^
^f de'loti^ns w.kos ^bit os a tness: of our mGmbership figures, dov/nto^
on tho'last'Lis-b but wo hope -bhx-b this low_ figure is only .•fcemporary.
wyo'ne asks you if you have rooe?.vcd "A .R."' and they h&VGnt-^ thel:l •bQn Ifco
ono';bhoy-haven'-b paid •their sub. 'Ask •bhom-fco'send it forthwith.
, TheMon-fchlyBulls-bin, pf. Tb.eWtreloss Insti-tu-be of Austsralia,
Tasmanian Division, Page 4, Augus-b 1961,
This Bulletin* , ^_, . ^ ^. ".^. ,
In res pans e. -bo^a "request; a few "(%neral Meetings ago 1'or a
to assie-b -fche Seore-bary,. a now ly joined Assooiato Meraber, .№« Sfio Gr&inger
has volun-tieored. 'to ass is'fc, and will in fu-fcure be -bhe Bullo-bin SSitor, I-b •••-
T;ill now be neoossary tha-b all oopy for inolusion in •fche Bulletin be in the
hands of t'he Soore'fcary on or before -fchQ inon'fchly meeting of •the Counoil,
which, in oaso you have f'orgo'fc-ben, -fcakes plaoe on •bh© -fchird •fchursday in eaoh
month, aon'fch. So you will help your new Edi-fcor, printcr, oomposor author and oopy
boy by Eiaking suro th&'b -bhis is done. Also -bGohnioal ar-bioles are still
rcquirefiequirod, no-b only for this Bulletin bu-fc also for "AEateur Radio" if you
'" will tnatoe ths effort •fco do some'thing about; i-fc, ••'SOiI- please.
TECmiG.AL.
AUDIO FREQUENCT... RANGE FOR AMTEUR PEOKS WOBK'. (Continued).
If the valve is a •fcriode then tho roaat&noo of •the condenser a-t
300 ops raus-fc equal Rg plus ( Rl and Rp in parallel)
1
i«Q« Rl plus Rp .
^fo a'lln^ —r^ :- •fche moral is, s'tiok •to pen'fcodos,
Howovor, in most oases •fcho formula
C equals ^,^v^ ."^•<-u will bs noar enough.
plus
For a •fcypiaal high au -briode -bhis would work ou-fc at soine-bhing
be-bween •0015 and •002 uf. and ei'fcher would be OK. This would also not be
•boo f&r off for a low mu -triode.
High Frequeno ros onse. This is tailored by shor'fci.ng oondensers from pLate
•bo earth in these •bwo stages. In •fcho pentodo oase tho roaotanoo of this
o ondonsor a-b 3 Ko/s should equal Rg aand Rl in parallel,
- 1 3g. Rl
i"°* 27T. fo oquals Rg plus Rl
This ",' works out to Cp equals 50 (Rs; lus Rl) in uf«
Rg. R
For thb previous oase •this would be 400 pf.
For the triodo oase the reaotdfnoe of -tho oondensor would hgsr G -to equa. 1 Rg,
'Rl add Rp all in parallel.
For a typiool High wi triode -bhe value would be about . 001 uf, and for a
Typioal'low mu triode it would be- a'bou't .008 uf«
A -bypioal oiroui'fc -fchcn would be
. 001
6AU6 6SQ7 002
001 .
.
7'
^. J.
220
0 K T
2^0
777-
J
And here is a quick one froa the VK5 Bullo-bin, If you have a slipping
dial oord, dis'splvo "a snail ataount: of resin in aloohol and -then paxin-b •fche
solwbion on the cord. The aloohol will evapora-te, leaving a -fchin layer of
resin, which preven-ts slipping.
Well fellcws -bho, -b is i-fc for -bhis month, next mon-bh you should
hsxve a UOVA' Bullo-bin Edi-bor and i-t is up -bo you •bo see •fcha-fc you sond me
•bhe inforna-bioc you wan-fc publioizod in tiraG for inolusion. Good Iwk in
•the Con-bos -fc and tnaybe I will' see you on the air from time •to •fcimo.
Cheerio and 75
K« E, Milliu. Hon. Seore-bary.