SKM C450i24093012281
Recognised text
Text below was produced by optical character recognition and may contain errors. Check it against the original.
TH € W-iREL ES S, " 1-N ST I TUT E
—• . 0-F AUSTR. ALI A
MOUTHLY... BULLETIN. Tasmanian Division. -JULY^1961.
Box 851J. G. P. O.
HOBART.
PRESIDENT. TRR^TTR^. S8EBRBIARY.
Mr. T. Alien Mr. C. H&rrisson 'Mr. K. Millin.
VK7AL.. VK7CE. VE7KA
Regis-fcere(i_a-fc G_''P_*0_'_]S.o^Q^^£or^ 'fcr^.:ni.trll,s^.i^.n_b^. £°^.'fc_a£. a. E.eLi^dl.oa.ll.
GENERA. L MEETING. The next General Mee-fcing of -the Tasmanian Division will be
held at -the Club Rooms, 147 Liverpool St. on Wednesday, July 5-fch. a-b
2000 Ers, VISITORS WILL BE WEICO&G3 and please introduce your guests -fco
•fche Presideh-fc or Secretary.
LECTURE.
.
The Leo-bure. -bhis month will be given by Mr, Wi Nisfaet, VK7BN. Bill
has. en-bi-fcled his. lec-fcure "Interstate Airoraf-b Radio Sys-fcems". This promises
' —bo be a very in'teres'fcing evening s o disregard the wea-bher and oome along*
Anyivay, -there cay no-b be any rain -bha-fc nigh-b (l hope).
ITORTH-lSESTEm^ . ZONE. '.. .. . The nex-b Meeting of -bhis S.one wiU. be h@. ld,i. a-b lakin's
'y&~fi, - Olverstone, on Tuesday July" 4-bh, and wil be a social one. The
Meeting*w. ill start at 8 p. m.
There will be a mammo-th austion as well as a Leo-fcure by №. K.
Saxon, VK7AI, on SSB.
;.
NORTHERN-ZONE. ' The next Mee-bing of. -fch.is Zone will be held a-t the residence
of 'Mr. Robin Harwood, 5 Helen S-b.. '.on Friday July Mtl'L. a-fc 8 p. m. I
understand tha-fc one boards -the News-bead 'bus and ali-ghts at; S-top 11 in
order'to reaoh •this address*
V. E. FJ, Grou . This group's next Mee ting will be-on-July •19-bh, in -fche Clubrooms.
everyone, w ith or wi-thou-fc an in'teres'fc i.n V. H. F., is weloorne.
Our Secretary is n.ow- №. B. Eyre, VK7ZBE.
1 Maryville Esplanade.
SAI.IDY BAY. HOBART.
A-b. our June Mee'fclng, -bhe following. Members were eleated to the
Lecture Gommi-b-fcee Mr* E. Cruise, VK.7EJ,.
Mr. M. Yfe'fcson.. • . VK7ZA. K.
№. R* Emnietl;. VK7SAO.
tn dlsc'ussion it was resolved no-b -bo have, as normal prao-fcioe,
formal lec-.-bures, bu-t; -to o'oncen-bra-be ins'fcead on'demonstra-fcio. ns and exhibi-
•fcions of'.equipment arid- techniques, by our own-Members. This w.ould provide
a service which is no-b always possi'ble within o-fcher'. a'o'b'ivi'fcie's' of -bhe
Division.,, and shoul.d. proyeof'in-fceres-fc -bo all Members. One such ao-fcivi-fcy
under oonsi.deration ±nv olves •fche aolleo-bion of •v&ri. ous', i-bems^. ..of •fces-fc
equip ment, (h-ora "various sources) and a deinonstration of 'bheir appUcation
in'ensuring tha -fc yeur' receiver is operating ^o.-the "best of i-fcs ability.
Anyone wishing'-bo could . tiri&g along -bheir gear and see how crook i-b really
2 M:<. Ao-tivi-ties. 'Mos''t opera-fcion is oen-fcered, a-b -fche raomen-fc, on 2 mx. ^chief
'i-bem'o: in-fcerest being our weekly/nor-bh-sou-bh skeds < To date, reoeption of
sou-fcherri's-fca-tionVKYZAO'has been"oonsis-ten-fc, if wanting in signal s-fcreng-fch.
Two-way contaots have riot ye-fcresal-bsd 8. 1't;hough*__during. thls_Periodf signal
beleived -to be VK7PF & VK7I2 have been heard by VK7ZAI & 7K7ZAO. la-ber in
year, wi-fch nore favourable, atrnospheria . oondit ions and be-b-fcer receBsvers down
souti h, we . hop e to or8. ok, ''-the barrier.^
.
' ITheth^r or no-b-these skeds'will .oontinur is uncertain, however a
•bw-o-way sicedof 5 minutes each v;ould keep up in-fcer^-t and ensure "ao'fching
"out of the box" is missed.
'In line with •this, muoh building ao-bivity is taking place- par-fcio-
ularly with receivers, VK7ZAK is trying out a preamplifier using 6A-M4's,
VK72AO/Q- whose receiver hasn'-fc been the seme two weeks running, hopes to
be using a 6CW4 Nuvis-bor.
The Montihly Bulletin of -the Wireless Insti-bu-te of Australia.
.......,Tasmania..n Divisipn* Paggo 2 July 1961.
.
NQTff.Ma'ti.ons. oh -bhls''band are VK7MS-using-a ••522 -tx. and rx., VK7-2A.Z is trying
ou-fc a 522 ^. Q. ^~^7^T~~i5~sor№wherQ'^G^WQenll&.sn d 2AIx. , has ye-fc feo
decide whether to go up or oome doi'vn.
Local Bappenings. .'•-, , . ; ;, '. . , •
VK7ZBE (and VK7ZA. I). have been opera-fcing por-ta'bls a-b Kolso, working
Launoes-boxi 5 and 9 on 2 mx. Seems Bryan's new beam and rx« are working
•well, ': -
A new s-fca-bion in'operation is VK7ZAB', on 1 tnx., from Sandy Bay,
Richard's beam will probably be- 70 f-fc. above ground level soon - on top
of. Hy^-be'n. Hall I
Congratulations -bo Neville Fisher on passing the firs-fc seo-bion of
his -tioke-fc, Nev. will be sit-fcilig for •the C.W. next; -fcime. Best of luck,
and, we expea± to heaE you on. ,2. mx, in t.'he in-fcerim*.
VK7ZAI now has a 140 wa-b-fc "port. able" rig in opera'fcion on 2 mx»
also the geneg^'&ers •to ryn^ •bhe'1 "thing «.
. Only one lone 6. mx, DX opening worked reoen-bly - VK2 on liay 24-bh-
anyone work anything 27 days la-fcer.
S'-eems likely tha-fc -fche nox-fc Ros s Hull Gon-fces-fc will be run on a
mileage basis* If you've any ideas on •this soore, ootne: along to the next
divisional tnee-fc ing and air -bhem. We'll be needing a seo-fcion for 10, 000
Mas* now - belierv-e -bhe VK2ts have Virorked 5 railes on -this band»
(Signed) R. K. mMEST VK7SA.O
S.W. L. -GROUP, '"""
Last Mee-bi : 11 taembers attended for -bhe meeting, whioh •was begun at •the
Club Rooms, The junior raerabers were spli-b in-fco groups of -biAro, fift.iking only
•bwo groups as only four of a possible -hvelve turned. up* . These groups were
then -taken by senior tnem'bers -fco two of 5 Ama-teur S'fca'bions whioh kindly
offered'-fcheir services.
' The resulting set up was:-
YK7CT:- 5 persons (2 juniors included) in charge of Ted Beard, our
Presiden-b (L7002/VK7ZAU).
VK7KA. ;- 3 members (2 juniors in charge of 1'Tev. Fis'her, L7013)
V&7JB:'&VK7KS, Dicky Sogers (L7004/VK7ZAN) and Lawrenoe Shul-bz(. L7017)
went: •to-bh-es-eQ. T. M. s, first -to Charlie\s, -bhen Jack's.
VK7ZZ:- Yours'Truly, Mike Jenner (L7007/VK7ZAV) was en-ber-bained by lan.
.
These five s-fcations were in contact; with each other in a
round •table which was. 'joined la'fcer by. VKPMr in Cremorne who prc^-ided some
added inter es-fc -for -the boys, ; :• . ;. ,.. '.
The Ana-beurs' ooncerned -bhoroughly enjoyed thenisslves and -the
oorrversa-fcion finished up ("as always, when Ken and myself get a chance -to
have .words) on-the subjeot of C.W.
Our .. sincere -thanks go -bo 7CT/7KA/7CT/7JB •& 7I<S for their oo-opera-
^.tion, and 'al'fchough -the 'a-b'te.ndanoe disheartened -fche . organisers' soinewhat,
it 'is hoped 'to -fcry this again, ' and wi-bh mor. e suooess, v/e hope*
Next; Meetin » No-bhing has been planned at;, •fcime, of writing, . but members will
e not led via. VKWI.
Listener's'Re or-fcs. L7013, liTeville, is perhaps our mos-b o.ons-fcant lis'tener
a-b the Eoment and has received ;a couple Of Q. S. L* oards,
I, (L7007) heard a VE2 on 6cix. a-b 2055 hrs on •ibh© 24/5/61,
using oa,ly a dipol-e for fan antenna. His sigs were 5 and. 9 for -a '-fcirne,
No .lo-bh-er. news at time of writing* •' ' - '
It would-be appreoia-fced if members would write to me so that
I have soraething-bo pu-fc-in-this Bullet. in, so hovr about; it;, ohaps? The
tnore le'fc'fcers T g.e.t. on a<3-fcivitie's"e-fcG., the 'bigger
;
fand be-b-ber -bhis ar-fclole
will become, "' ' ., ' -. , :
In'bers'b.a'fc.e. News..'• ThQ'. Mainland-Ci.ubs.;. are. gaining.. new members all the
•birae, bu-b seem •t;-. oh&vet;he'samedi:ffiou3.t;y:a5..'we do, . That, is,, a-b'tendanoe
, at our. meet.ings.... I-b is. rumoured. the.Maurio a C!OX, I. S'.W. L. Group AR. Sub
Edi'fcor., has applied^ for a 'transfer andrRayr.b^ cop^n^',^0 Tas
The Mon-bhly Bulletin of The Wireless Insti'tuts od Ausisralia*
T&srnanian Division* -. . Page 3,. July 1961.
T'eohniaal, I have'nothing for . -this seo-tion this cion-bh, bu-fc next; mon'fch
•wil pro ably supply dope on ^converter design and building.
Tha-b1s-a. ll for, -this month, ohaps. Reinenber, if •fch©re is any
news, or anything of in-teres-t .. happening . in your looali-by, writs and le-fc cne
know,
73 MIKE JEa\TKIER, SW. L. GROUP S S3 •
L7007/VK7SAV.
CLA.SS UFln EMISSION, The PM.G Dep-fc. has no-fcified -bha-fc i-b is prepared -bo
. au-b orize. use of Class-Fl emission (tnaxitaum^frequenoy shift 850 o*p«s«)
on all AtnEfteur Ser-o-ioe Bands on a -fcrial basis yn'til 51s-t;« Maroh 1965,
inolus-ive, when -bhe posi-fcion will be reviewed in the ligh-fc of operating
oondi-fcions then ob-baining.
In this oonnea-bion, you will knovj •tha-fc, in aooordabce w-fch
wi-fch the condi-fcions ss set out in paragraphs 155 and 136 of -bhe Bepar-tmental
publjLoation "Handbook, for Operators of Ana-fceur Wireless S'fca'tions"i-b is
required, t-ha-b -
'T135. The op era-bor . of an ama-teur sta-bion shall transni't the •fche oall sign
of' the s-fca-bi-on being worked and -the oall sign allo-t-fced -to •bho sta'fcion^-bha't
he is operating a-b -bhe beginning and -the end of each session, and at leas-fc
onoe in every five minutes during the session*'
"156, Callsigns. m-us-fc, in all oases, be signalled in full and in such a
manner as to leave no doubt as to -bheir iden-fci-by and nust include -bhe
na-bionality prefix le-b'-bers "VK"«"
• In're'speo-b of the aha? e quo-fced oondi-tions, it is required tfiaAn
amateur, s-bation liaensee who'uses CsLass Pl emission that transmission of
•bheoallsigns shall be effeo-fced ei-ther by hand speed morse oode (Class Al
emission) or radiotelephony signals* .
I-b is suggested tha-fc'you keep this informat. ion for fu-bure reference,
The abcwe quoted paragraphs apply a •fc-a. ll •fcttnes,. whe-fchsr or not you use
Class Fl eraission.
REMEMBRA.NC'E DAY COI\TT££T. This Con-fces-fc will be held next; mon-bh, 12-fch & ISth.
August'* About -fcline you gays •the rig a oheol" over rready for t;his event,
hope •bha-1; all the o-fcher Divisions in -bhe Com'T'. onweal-bh do -bhe satne and -bhat
•the ContQS-t is'-bhe unqualified suGcess -fcha-t it; has been in +;he pas-t..
SUBSCRIPTIONS* • At №e 'Oounoil Meeting held on 3^^ 22nd. :last _i-t was^ deoided that
"ose'Menbers who have no-t paid their Subsorip-fcions.by July^ 6-fch, T^iU^
forthwi-fch have -bheir names removed from the Ciraulation List for "AK!
Radio'\'TIIIS IS YOUR IAST OPPORTUEITY? 30 DO SOMETHING AP OUT IT. N 0 W.
Subs. received 19/5/61 to. 22/6/61. VKY^LS' VK7GB, _VK7RL.^
Messrs. D. Porthouse, G. .Vr-ignaud, №. D. Barret-b, Dr. G. Reber, L.Grainger,
J, Fors-fcer, D. Bulnan, K. Fame 11. V^m YOU.
VKWI BROADCASTS. Your at-feen-bion is again drawn to -bhe faotthat the ^roadoast is
LTe^ransrai^ed"on;5672 K^/s, and on the 50 and U4^Mo/s bands- The, firs^
mrned"is"for the benefit'of'-bhe Country Meinbers and if conditions do^
favour ~714l6'Ko/s it; sho'uld be possible'-fro hear the news on this frequency,
JAMOREE-ON-THE-AIR^ Stations signifyi"g^hs_lr_lnten^on "bo^ake par\^. ^his
"uvu:>u"^len^hir^ar"to~date a^":->/.VK7GC, VK7TB. VK7RL, VK7CT, and VK7ZZ^
If"you''want^o-help-the Boy Scouts with this .event^Pleas^let, tn,e kn^^s
s''ojon"as"possible or, you'don't
like wri-fc
if le-fcters, let Jaok,
ing
know on •fche Sunday Bound-up,
UTE ' 'i have heard over. the air ^his morning that the Annual General Meei-ing
Ulverstone,
of :bhe~NOTH-WESTERN ZONE w&ll be held at Lakin1 s Ball, on
Augus-fc first nex-fc. So make a no-be of this da-be c.nd
QS L BUREAU BOX NUIffiER*
"Fw'fcho uiapteenth. -bine, and, I hope the last, -bho QSL Bureau Box
number is,
5 7 1 B. G. P. O. Eobart;.
Do IT 0 T send QSL cards -bo -the Divisional Box Number. PLEASE.
Wi The Monthly Bulle-bin of the TiTireless Institute of Aus-fcralia.
Ta-smanian Division. Page. 4. July 1961,
TECHNICAL. _ . '.-:. ' •^;".. ;. ' : ^. ;''.—-.. .... :. „ .,•
Audio Frequeno Range for Amate.ur. Phone Work. .
Ther is a aonsiderab e case for •fche-restrio-bion of'theA. F. rang. e-used by
•"Attfi-fceurg .. ^ The.'.lew auel. io: frequencies .. in, a, nale .yoioe are qui-fce pOTirerful
wa/ve forms, byt they oorr?-ey. very,, l.
ittlet6^he'inten3 ;gibiUty'^^
s o if -they are reduoed or even elirriina ted -bhe- in'bsll'igibili-by wiU not
s'i.iffer:'6ufc.l-fch:e power of. the'.•fcransmi'tter .. oan .be. used tnore effeo-fcively in
'•fcransmiWing-. ''bhe'es'sen'fc.ial frequenoies.. . . .. . . . -
In the oase of'SSB and DSB transmissions i-f is essen'fcial'to out;
•the low •freqtuenGiGs:aKd in^soine oases the higher frequencies too. In the
oas^ of a phasing type SSB systein -bhe dtesign of an audio phasing ne-fcwork
•bo. 'ower a'large''frequency range is^very^diffioult, and^hQ usual types^o
cover--only . the"range"300^o •30. 00 o. |. s. ~I.f any frQquenoies^. ou-bs. ide^hese.
' dr 6'presen-b the . suppression of. -fche unwanted •sideband will be-^degr. a,.ded. In
•. the :oase"of. -bh6 fil-fcer -fcype sys.-bein -the ou-fc-off near the^ oarrier^ i. e^ for
' low. fr°quenqy sideband is no-b sharp. enough.•bo suppress the urovan-ted lom-
frequency s idebadd. This will not increase/'fche band width but wiir make
reception diff. io ul-fc. In-•fche oase of DSB the diffioulty lles, in i'ts_. reoeP~
•t ion with oonven-t/io. nal. reoe'ivers, which oan.. only suooegsfully receive DSB
ifi't;heyl'are selec-fcive enough •to olimina-fce •the unwanted sideband. As •bheir
seleo-bivi-by oharao-beris-fcics are usually worse then •bha-bof-fche. -bransni'b'bing
filfcer'ii-b is''mos-fc itnpor-ban-b -bha-b no low froquenoy side band exist* ,
The farst'result -fcherefore of response -tailoring is tnore
effeo-fcive '•bransBiss^on. Seoohdly. the high. frequencies do no-b contribu-fce
greatly to the in-fcelligibili-fcy of -fche signal., in fao-b they do not usually
get p&s-fc -fche-'highly seieo-bive modern ^^reaeiverffindtheirmalneffeo^,ls
to pr ovide'.a. n unnecessarily broad signal* An audio frequency ••bandwid'bh
wfhSQB-is down 6 db. ati 300 and 3000 'o. p. s. will do. nicely for Amateur
phcns'work gt-v&Qg qui-be natural.. s ounding quali-by whils-fc providing
gffeo-bive jiransmission and miniffiiz ing in-fcerfcrGr. Ge •to o-t. hers.
E@<hod. • • • , , _ ,
One way of res-trie-ting •. the the pass . band is the use
fil-b'ers, but -these are usually oompliaa-bed'and expensive. A sitnpler and
cheaper'method is -the .tailoring of'-fche in-fcerstage ooupling components.
Low Pre uen Res oase. : ....'
This is done by restricting the size of^the coupling
" oondenser in K/C sys-fcems. In order -bo get a suffioiently sharp ouf-off i-b
is neoessary -bo 'opera-fce on' two s-b&ges. The. rest of %hGm' may. ha^.s norcial. , ^.
ooraponents and-response. The requiroaen.-b •fc^n is -fcwo s"ba. gss whioh are
both 5 db. down .at 300 o, p. s. The best s-fcfi. ges ..-to opera-to on are -fchQ first
' trwo. Firs-fc the grid leabs'shown (Rg) should 'be reduoed •to 250 K ohms*
I. -the amplifier is a' pen-tode t;he -the reactanc. c p.f -fche coupling oondenser
9,'t; '300 o, p«'s. should equal, . Rg plus Rl. /
, li*e* .—wy ^ "^ _ "•:1"- __'
^.^^,,, ;&'M,FIUS ^ _ _ . 1000
and for .300 o. p. s, 'c^-b-off C = ^7—:—^ , :Ln ur'
^<^^?)
For example, if Rl is 250K as is -bypioal then
Rl plus Rg 500, 000
e&nd
1000 1000. _ 001 uf*
^500, 000 1, -000,'QUO .
(To bo Continued).
Seems -bha-fc •fcypevirri-bers wer.o not designed by ma-thema-fcioians, a-fc l®a's'b
. migie has not s'ome of -bhe s. igng which are neaessary so zyi. il have •bo do t;hem
t)y'hand.. i:0nly hope tha-fc I put^'the righ± signs in.•the right--plaoe... ...., ;.. '.,
• -Seems to be'all -this mon'fch. Just-a further, rsminder abou-fc -bhe
Subs. There are s-bill 35 Members who li.a.ve neglec'ted-fco a-fct;. end to -fch&s
tifit'ter,. a nd cons ld. er ing that -fcheywero due on K'Sarch Is.t. I •fchink •bh&t
even -bhes'e 35 Members would agree..•tha-b-'bhey are well. overdue. If you. :
happen -bo know anyone who- hasn'-b paid: up e.fld. apparently doosn't read •fchs
Bulletin, see if you o an'needle -bh'Qni in'tQ,,doing^ •fcho righ-fc -thing.
73
K.-. E.. Millin»; ; ,.
Hon. Soore-bary.